arch/x86/kvm/svm.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * AMD SVM support
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  *
   8  * Authors:
   9  *   Yaniv Kamay  <yaniv@qumranet.com>
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *
  12  * This work is licensed under the terms of the GNU GPL, version 2.  See
  13  * the COPYING file in the top-level directory.
  14  *
  15  */
  16 #include <linux/kvm_host.h>
  17
  18 #include "kvm_svm.h"
  19 #include "irq.h"
  20 #include "mmu.h"
  21 #include "kvm_cache_regs.h"
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/highmem.h>
  27 #include <linux/sched.h>
  28
  29 #include <asm/desc.h>
  30
  31 #include <asm/virtext.h>
  32
  33 #define __ex(x) __kvm_handle_fault_on_reboot(x)
  34
  35 MODULE_AUTHOR("Qumranet");
  36 MODULE_LICENSE("GPL");
  37
  38 #define IOPM_ALLOC_ORDER 2
  39 #define MSRPM_ALLOC_ORDER 1
  40
  41 #define DR7_GD_MASK (1 << 13)
  42 #define DR6_BD_MASK (1 << 13)
  43
  44 #define SEG_TYPE_LDT 2
  45 #define SEG_TYPE_BUSY_TSS16 3
  46
  47 #define SVM_FEATURE_NPT  (1 << 0)
  48 #define SVM_FEATURE_LBRV (1 << 1)
  49 #define SVM_FEATURE_SVML (1 << 2)
  50
  51 #define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
  52
  53 /* Turn on to get debugging output*/
  54 /* #define NESTED_DEBUG */
  55
  56 #ifdef NESTED_DEBUG
  57 #define nsvm_printk(fmt, args...) printk(KERN_INFO fmt, ## args)
  58 #else
  59 #define nsvm_printk(fmt, args...) do {} while(0)
  60 #endif
  61
  62 /* enable NPT for AMD64 and X86 with PAE */
  63 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
  64 static bool npt_enabled = true;
  65 #else
  66 static bool npt_enabled = false;
  67 #endif
  68 static int npt = 1;
  69
  70 module_param(npt, int, S_IRUGO);
  71
  72 static int nested = 0;
  73 module_param(nested, int, S_IRUGO);
  74
  75 static void kvm_reput_irq(struct vcpu_svm *svm);
  76 static void svm_flush_tlb(struct kvm_vcpu *vcpu);
  77
  78 static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override);
  79 static int nested_svm_vmexit(struct vcpu_svm *svm);
  80 static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
  81                              void *arg2, void *opaque);
  82 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
  83                                       bool has_error_code, u32 error_code);
  84
  85 static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
  86 {
  87         return container_of(vcpu, struct vcpu_svm, vcpu);
  88 }
  89
  90 static inline bool is_nested(struct vcpu_svm *svm)
  91 {
  92         return svm->nested_vmcb;
  93 }
  94
  95 static unsigned long iopm_base;
  96
  97 struct kvm_ldttss_desc {
  98         u16 limit0;
  99         u16 base0;
 100         unsigned base1 : 8, type : 5, dpl : 2, p : 1;
 101         unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
 102         u32 base3;
 103         u32 zero1;
 104 } __attribute__((packed));
 105
 106 struct svm_cpu_data {
 107         int cpu;
 108
 109         u64 asid_generation;
 110         u32 max_asid;
 111         u32 next_asid;
 112         struct kvm_ldttss_desc *tss_desc;
 113
 114         struct page *save_area;
 115 };
 116
 117 static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
 118 static uint32_t svm_features;
 119
 120 struct svm_init_data {
 121         int cpu;
 122         int r;
 123 };
 124
 125 static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
 126
 127 #define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
 128 #define MSRS_RANGE_SIZE 2048
 129 #define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)
 130
 131 #define MAX_INST_SIZE 15
 132
 133 static inline u32 svm_has(u32 feat)
 134 {
 135         return svm_features & feat;
 136 }
 137
 138 static inline u8 pop_irq(struct kvm_vcpu *vcpu)
 139 {
 140         int word_index = __ffs(vcpu->arch.irq_summary);
 141         int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
 142         int irq = word_index * BITS_PER_LONG + bit_index;
 143
 144         clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
 145         if (!vcpu->arch.irq_pending[word_index])
 146                 clear_bit(word_index, &vcpu->arch.irq_summary);
 147         return irq;
 148 }
 149
 150 static inline void push_irq(struct kvm_vcpu *vcpu, u8 irq)
 151 {
 152         set_bit(irq, vcpu->arch.irq_pending);
 153         set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
 154 }
 155
 156 static inline void clgi(void)
 157 {
 158         asm volatile (__ex(SVM_CLGI));
 159 }
 160
 161 static inline void stgi(void)
 162 {
 163         asm volatile (__ex(SVM_STGI));
 164 }
 165
 166 static inline void invlpga(unsigned long addr, u32 asid)
 167 {
 168         asm volatile (__ex(SVM_INVLPGA) :: "a"(addr), "c"(asid));
 169 }
 170
 171 static inline unsigned long kvm_read_cr2(void)
 172 {
 173         unsigned long cr2;
 174
 175         asm volatile ("mov %%cr2, %0" : "=r" (cr2));
 176         return cr2;
 177 }
 178
 179 static inline void kvm_write_cr2(unsigned long val)
 180 {
 181         asm volatile ("mov %0, %%cr2" :: "r" (val));
 182 }
 183
 184 static inline unsigned long read_dr6(void)
 185 {
 186         unsigned long dr6;
 187
 188         asm volatile ("mov %%dr6, %0" : "=r" (dr6));
 189         return dr6;
 190 }
 191
 192 static inline void write_dr6(unsigned long val)
 193 {
 194         asm volatile ("mov %0, %%dr6" :: "r" (val));
 195 }
 196
 197 static inline unsigned long read_dr7(void)
 198 {
 199         unsigned long dr7;
 200
 201         asm volatile ("mov %%dr7, %0" : "=r" (dr7));
 202         return dr7;
 203 }
 204
 205 static inline void write_dr7(unsigned long val)
 206 {
 207         asm volatile ("mov %0, %%dr7" :: "r" (val));
 208 }
 209
 210 static inline void force_new_asid(struct kvm_vcpu *vcpu)
 211 {
 212         to_svm(vcpu)->asid_generation--;
 213 }
 214
 215 static inline void flush_guest_tlb(struct kvm_vcpu *vcpu)
 216 {
 217         force_new_asid(vcpu);
 218 }
 219
 220 static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
 221 {
 222         if (!npt_enabled && !(efer & EFER_LMA))
 223                 efer &= ~EFER_LME;
 224
 225         to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
 226         vcpu->arch.shadow_efer = efer;
 227 }
 228
 229 static void svm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
 230                                 bool has_error_code, u32 error_code)
 231 {
 232         struct vcpu_svm *svm = to_svm(vcpu);
 233
 234         /* If we are within a nested VM we'd better #VMEXIT and let the
 235            guest handle the exception */
 236         if (nested_svm_check_exception(svm, nr, has_error_code, error_code))
 237                 return;
 238
 239         svm->vmcb->control.event_inj = nr
 240                 | SVM_EVTINJ_VALID
 241                 | (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
 242                 | SVM_EVTINJ_TYPE_EXEPT;
 243         svm->vmcb->control.event_inj_err = error_code;
 244 }
 245
 246 static bool svm_exception_injected(struct kvm_vcpu *vcpu)
 247 {
 248         struct vcpu_svm *svm = to_svm(vcpu);
 249
 250         return !(svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID);
 251 }
 252
 253 static int is_external_interrupt(u32 info)
 254 {
 255         info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
 256         return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
 257 }
 258
 259 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
 260 {
 261         struct vcpu_svm *svm = to_svm(vcpu);
 262
 263         if (!svm->next_rip) {
 264                 printk(KERN_DEBUG "%s: NOP\n", __func__);
 265                 return;
 266         }
 267         if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
 268                 printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
 269                        __func__, kvm_rip_read(vcpu), svm->next_rip);
 270
 271         kvm_rip_write(vcpu, svm->next_rip);
 272         svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
 273
 274         vcpu->arch.interrupt_window_open = (svm->vcpu.arch.hflags & HF_GIF_MASK);
 275 }
 276
 277 static int has_svm(void)
 278 {
 279         const char *msg;
 280
 281         if (!cpu_has_svm(&msg)) {
 282                 printk(KERN_INFO "has_svn: %s\n", msg);
 283                 return 0;
 284         }
 285
 286         return 1;
 287 }
 288
 289 static void svm_hardware_disable(void *garbage)
 290 {
 291         cpu_svm_disable();
 292 }
 293
 294 static void svm_hardware_enable(void *garbage)
 295 {
 296
 297         struct svm_cpu_data *svm_data;
 298         uint64_t efer;
 299         struct desc_ptr gdt_descr;
 300         struct desc_struct *gdt;
 301         int me = raw_smp_processor_id();
 302
 303         if (!has_svm()) {
 304                 printk(KERN_ERR "svm_cpu_init: err EOPNOTSUPP on %d\n", me);
 305                 return;
 306         }
 307         svm_data = per_cpu(svm_data, me);
 308
 309         if (!svm_data) {
 310                 printk(KERN_ERR "svm_cpu_init: svm_data is NULL on %d\n",
 311                        me);
 312                 return;
 313         }
 314
 315         svm_data->asid_generation = 1;
 316         svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
 317         svm_data->next_asid = svm_data->max_asid + 1;
 318
 319         asm volatile ("sgdt %0" : "=m"(gdt_descr));
 320         gdt = (struct desc_struct *)gdt_descr.address;
 321         svm_data->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
 322
 323         rdmsrl(MSR_EFER, efer);
 324         wrmsrl(MSR_EFER, efer | EFER_SVME);
 325
 326         wrmsrl(MSR_VM_HSAVE_PA,
 327                page_to_pfn(svm_data->save_area) << PAGE_SHIFT);
 328 }
 329
 330 static void svm_cpu_uninit(int cpu)
 331 {
 332         struct svm_cpu_data *svm_data
 333                 = per_cpu(svm_data, raw_smp_processor_id());
 334
 335         if (!svm_data)
 336                 return;
 337
 338         per_cpu(svm_data, raw_smp_processor_id()) = NULL;
 339         __free_page(svm_data->save_area);
 340         kfree(svm_data);
 341 }
 342
 343 static int svm_cpu_init(int cpu)
 344 {
 345         struct svm_cpu_data *svm_data;
 346         int r;
 347
 348         svm_data = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
 349         if (!svm_data)
 350                 return -ENOMEM;
 351         svm_data->cpu = cpu;
 352         svm_data->save_area = alloc_page(GFP_KERNEL);
 353         r = -ENOMEM;
 354         if (!svm_data->save_area)
 355                 goto err_1;
 356
 357         per_cpu(svm_data, cpu) = svm_data;
 358
 359         return 0;
 360
 361 err_1:
 362         kfree(svm_data);
 363         return r;
 364
 365 }
 366
 367 static void set_msr_interception(u32 *msrpm, unsigned msr,
 368                                  int read, int write)
 369 {
 370         int i;
 371
 372         for (i = 0; i < NUM_MSR_MAPS; i++) {
 373                 if (msr >= msrpm_ranges[i] &&
 374                     msr < msrpm_ranges[i] + MSRS_IN_RANGE) {
 375                         u32 msr_offset = (i * MSRS_IN_RANGE + msr -
 376                                           msrpm_ranges[i]) * 2;
 377
 378                         u32 *base = msrpm + (msr_offset / 32);
 379                         u32 msr_shift = msr_offset % 32;
 380                         u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1);
 381                         *base = (*base & ~(0x3 << msr_shift)) |
 382                                 (mask << msr_shift);
 383                         return;
 384                 }
 385         }
 386         BUG();
 387 }
 388
 389 static void svm_vcpu_init_msrpm(u32 *msrpm)
 390 {
 391         memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));
 392
 393 #ifdef CONFIG_X86_64
 394         set_msr_interception(msrpm, MSR_GS_BASE, 1, 1);
 395         set_msr_interception(msrpm, MSR_FS_BASE, 1, 1);
 396         set_msr_interception(msrpm, MSR_KERNEL_GS_BASE, 1, 1);
 397         set_msr_interception(msrpm, MSR_LSTAR, 1, 1);
 398         set_msr_interception(msrpm, MSR_CSTAR, 1, 1);
 399         set_msr_interception(msrpm, MSR_SYSCALL_MASK, 1, 1);
 400 #endif
 401         set_msr_interception(msrpm, MSR_K6_STAR, 1, 1);
 402         set_msr_interception(msrpm, MSR_IA32_SYSENTER_CS, 1, 1);
 403         set_msr_interception(msrpm, MSR_IA32_SYSENTER_ESP, 1, 1);
 404         set_msr_interception(msrpm, MSR_IA32_SYSENTER_EIP, 1, 1);
 405 }
 406
 407 static void svm_enable_lbrv(struct vcpu_svm *svm)
 408 {
 409         u32 *msrpm = svm->msrpm;
 410
 411         svm->vmcb->control.lbr_ctl = 1;
 412         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
 413         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
 414         set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
 415         set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
 416 }
 417
 418 static void svm_disable_lbrv(struct vcpu_svm *svm)
 419 {
 420         u32 *msrpm = svm->msrpm;
 421
 422         svm->vmcb->control.lbr_ctl = 0;
 423         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
 424         set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
 425         set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
 426         set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
 427 }
 428
 429 static __init int svm_hardware_setup(void)
 430 {
 431         int cpu;
 432         struct page *iopm_pages;
 433         void *iopm_va;
 434         int r;
 435
 436         iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);
 437
 438         if (!iopm_pages)
 439                 return -ENOMEM;
 440
 441         iopm_va = page_address(iopm_pages);
 442         memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
 443         clear_bit(0x80, iopm_va); /* allow direct access to PC debug port */
 444         iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
 445
 446         if (boot_cpu_has(X86_FEATURE_NX))
 447                 kvm_enable_efer_bits(EFER_NX);
 448
 449         if (nested) {
 450                 printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
 451                 kvm_enable_efer_bits(EFER_SVME);
 452         }
 453
 454         for_each_online_cpu(cpu) {
 455                 r = svm_cpu_init(cpu);
 456                 if (r)
 457                         goto err;
 458         }
 459
 460         svm_features = cpuid_edx(SVM_CPUID_FUNC);
 461
 462         if (!svm_has(SVM_FEATURE_NPT))
 463                 npt_enabled = false;
 464
 465         if (npt_enabled && !npt) {
 466                 printk(KERN_INFO "kvm: Nested Paging disabled\n");
 467                 npt_enabled = false;
 468         }
 469
 470         if (npt_enabled) {
 471                 printk(KERN_INFO "kvm: Nested Paging enabled\n");
 472                 kvm_enable_tdp();
 473         } else
 474                 kvm_disable_tdp();
 475
 476         return 0;
 477
 478 err:
 479         __free_pages(iopm_pages, IOPM_ALLOC_ORDER);
 480         iopm_base = 0;
 481         return r;
 482 }
 483
 484 static __exit void svm_hardware_unsetup(void)
 485 {
 486         int cpu;
 487
 488         for_each_online_cpu(cpu)
 489                 svm_cpu_uninit(cpu);
 490
 491         __free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
 492         iopm_base = 0;
 493 }
 494
 495 static void init_seg(struct vmcb_seg *seg)
 496 {
 497         seg->selector = 0;
 498         seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
 499                 SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
 500         seg->limit = 0xffff;
 501         seg->base = 0;
 502 }
 503
 504 static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
 505 {
 506         seg->selector = 0;
 507         seg->attrib = SVM_SELECTOR_P_MASK | type;
 508         seg->limit = 0xffff;
 509         seg->base = 0;
 510 }
 511
 512 static void init_vmcb(struct vcpu_svm *svm)
 513 {
 514         struct vmcb_control_area *control = &svm->vmcb->control;
 515         struct vmcb_save_area *save = &svm->vmcb->save;
 516
 517         control->intercept_cr_read =    INTERCEPT_CR0_MASK |
 518                                         INTERCEPT_CR3_MASK |
 519                                         INTERCEPT_CR4_MASK;
 520
 521         control->intercept_cr_write =   INTERCEPT_CR0_MASK |
 522                                         INTERCEPT_CR3_MASK |
 523                                         INTERCEPT_CR4_MASK |
 524                                         INTERCEPT_CR8_MASK;
 525
 526         control->intercept_dr_read =    INTERCEPT_DR0_MASK |
 527                                         INTERCEPT_DR1_MASK |
 528                                         INTERCEPT_DR2_MASK |
 529                                         INTERCEPT_DR3_MASK;
 530
 531         control->intercept_dr_write =   INTERCEPT_DR0_MASK |
 532                                         INTERCEPT_DR1_MASK |
 533                                         INTERCEPT_DR2_MASK |
 534                                         INTERCEPT_DR3_MASK |
 535                                         INTERCEPT_DR5_MASK |
 536                                         INTERCEPT_DR7_MASK;
 537
 538         control->intercept_exceptions = (1 << PF_VECTOR) |
 539                                         (1 << UD_VECTOR) |
 540                                         (1 << MC_VECTOR);
 541
 542
 543         control->intercept =    (1ULL << INTERCEPT_INTR) |
 544                                 (1ULL << INTERCEPT_NMI) |
 545                                 (1ULL << INTERCEPT_SMI) |
 546                                 (1ULL << INTERCEPT_CPUID) |
 547                                 (1ULL << INTERCEPT_INVD) |
 548                                 (1ULL << INTERCEPT_HLT) |
 549                                 (1ULL << INTERCEPT_INVLPG) |
 550                                 (1ULL << INTERCEPT_INVLPGA) |
 551                                 (1ULL << INTERCEPT_IOIO_PROT) |
 552                                 (1ULL << INTERCEPT_MSR_PROT) |
 553                                 (1ULL << INTERCEPT_TASK_SWITCH) |
 554                                 (1ULL << INTERCEPT_SHUTDOWN) |
 555                                 (1ULL << INTERCEPT_VMRUN) |
 556                                 (1ULL << INTERCEPT_VMMCALL) |
 557                                 (1ULL << INTERCEPT_VMLOAD) |
 558                                 (1ULL << INTERCEPT_VMSAVE) |
 559                                 (1ULL << INTERCEPT_STGI) |
 560                                 (1ULL << INTERCEPT_CLGI) |
 561                                 (1ULL << INTERCEPT_SKINIT) |
 562                                 (1ULL << INTERCEPT_WBINVD) |
 563                                 (1ULL << INTERCEPT_MONITOR) |
 564                                 (1ULL << INTERCEPT_MWAIT);
 565
 566         control->iopm_base_pa = iopm_base;
 567         control->msrpm_base_pa = __pa(svm->msrpm);
 568         control->tsc_offset = 0;
 569         control->int_ctl = V_INTR_MASKING_MASK;
 570
 571         init_seg(&save->es);
 572         init_seg(&save->ss);
 573         init_seg(&save->ds);
 574         init_seg(&save->fs);
 575         init_seg(&save->gs);
 576
 577         save->cs.selector = 0xf000;
 578         /* Executable/Readable Code Segment */
 579         save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
 580                 SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
 581         save->cs.limit = 0xffff;
 582         /*
 583          * cs.base should really be 0xffff0000, but vmx can't handle that, so
 584          * be consistent with it.
 585          *
 586          * Replace when we have real mode working for vmx.
 587          */
 588         save->cs.base = 0xf0000;
 589
 590         save->gdtr.limit = 0xffff;
 591         save->idtr.limit = 0xffff;
 592
 593         init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
 594         init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);
 595
 596         save->efer = EFER_SVME;
 597         save->dr6 = 0xffff0ff0;
 598         save->dr7 = 0x400;
 599         save->rflags = 2;
 600         save->rip = 0x0000fff0;
 601         svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
 602
 603         /*
 604          * cr0 val on cpu init should be 0x60000010, we enable cpu
 605          * cache by default. the orderly way is to enable cache in bios.
 606          */
 607         save->cr0 = 0x00000010 | X86_CR0_PG | X86_CR0_WP;
 608         save->cr4 = X86_CR4_PAE;
 609         /* rdx = ?? */
 610
 611         if (npt_enabled) {
 612                 /* Setup VMCB for Nested Paging */
 613                 control->nested_ctl = 1;
 614                 control->intercept &= ~((1ULL << INTERCEPT_TASK_SWITCH) |
 615                                         (1ULL << INTERCEPT_INVLPG));
 616                 control->intercept_exceptions &= ~(1 << PF_VECTOR);
 617                 control->intercept_cr_read &= ~(INTERCEPT_CR0_MASK|
 618                                                 INTERCEPT_CR3_MASK);
 619                 control->intercept_cr_write &= ~(INTERCEPT_CR0_MASK|
 620                                                  INTERCEPT_CR3_MASK);
 621                 save->g_pat = 0x0007040600070406ULL;
 622                 /* enable caching because the QEMU Bios doesn't enable it */
 623                 save->cr0 = X86_CR0_ET;
 624                 save->cr3 = 0;
 625                 save->cr4 = 0;
 626         }
 627         force_new_asid(&svm->vcpu);
 628
 629         svm->nested_vmcb = 0;
 630         svm->vcpu.arch.hflags = HF_GIF_MASK;
 631 }
 632
 633 static int svm_vcpu_reset(struct kvm_vcpu *vcpu)
 634 {
 635         struct vcpu_svm *svm = to_svm(vcpu);
 636
 637         init_vmcb(svm);
 638
 639         if (vcpu->vcpu_id != 0) {
 640                 kvm_rip_write(vcpu, 0);
 641                 svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12;
 642                 svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8;
 643         }
 644         vcpu->arch.regs_avail = ~0;
 645         vcpu->arch.regs_dirty = ~0;
 646
 647         return 0;
 648 }
 649
 650 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 651 {
 652         struct vcpu_svm *svm;
 653         struct page *page;
 654         struct page *msrpm_pages;
 655         struct page *hsave_page;
 656         struct page *nested_msrpm_pages;
 657         int err;
 658
 659         svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
 660         if (!svm) {
 661                 err = -ENOMEM;
 662                 goto out;
 663         }
 664
 665         err = kvm_vcpu_init(&svm->vcpu, kvm, id);
 666         if (err)
 667                 goto free_svm;
 668
 669         page = alloc_page(GFP_KERNEL);
 670         if (!page) {
 671                 err = -ENOMEM;
 672                 goto uninit;
 673         }
 674
 675         err = -ENOMEM;
 676         msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
 677         if (!msrpm_pages)
 678                 goto uninit;
 679
 680         nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
 681         if (!nested_msrpm_pages)
 682                 goto uninit;
 683
 684         svm->msrpm = page_address(msrpm_pages);
 685         svm_vcpu_init_msrpm(svm->msrpm);
 686
 687         hsave_page = alloc_page(GFP_KERNEL);
 688         if (!hsave_page)
 689                 goto uninit;
 690         svm->hsave = page_address(hsave_page);
 691
 692         svm->nested_msrpm = page_address(nested_msrpm_pages);
 693
 694         svm->vmcb = page_address(page);
 695         clear_page(svm->vmcb);
 696         svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
 697         svm->asid_generation = 0;
 698         memset(svm->db_regs, 0, sizeof(svm->db_regs));
 699         init_vmcb(svm);
 700
 701         fx_init(&svm->vcpu);
 702         svm->vcpu.fpu_active = 1;
 703         svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
 704         if (svm->vcpu.vcpu_id == 0)
 705                 svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
 706
 707         return &svm->vcpu;
 708
 709 uninit:
 710         kvm_vcpu_uninit(&svm->vcpu);
 711 free_svm:
 712         kmem_cache_free(kvm_vcpu_cache, svm);
 713 out:
 714         return ERR_PTR(err);
 715 }
 716
 717 static void svm_free_vcpu(struct kvm_vcpu *vcpu)
 718 {
 719         struct vcpu_svm *svm = to_svm(vcpu);
 720
 721         __free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
 722         __free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
 723         __free_page(virt_to_page(svm->hsave));
 724         __free_pages(virt_to_page(svm->nested_msrpm), MSRPM_ALLOC_ORDER);
 725         kvm_vcpu_uninit(vcpu);
 726         kmem_cache_free(kvm_vcpu_cache, svm);
 727 }
 728
 729 static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 730 {
 731         struct vcpu_svm *svm = to_svm(vcpu);
 732         int i;
 733
 734         if (unlikely(cpu != vcpu->cpu)) {
 735                 u64 tsc_this, delta;
 736
 737                 /*
 738                  * Make sure that the guest sees a monotonically
 739                  * increasing TSC.
 740                  */
 741                 rdtscll(tsc_this);
 742                 delta = vcpu->arch.host_tsc - tsc_this;
 743                 svm->vmcb->control.tsc_offset += delta;
 744                 vcpu->cpu = cpu;
 745                 kvm_migrate_timers(vcpu);
 746         }
 747
 748         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
 749                 rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 750 }
 751
 752 static void svm_vcpu_put(struct kvm_vcpu *vcpu)
 753 {
 754         struct vcpu_svm *svm = to_svm(vcpu);
 755         int i;
 756
 757         ++vcpu->stat.host_state_reload;
 758         for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
 759                 wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
 760
 761         rdtscll(vcpu->arch.host_tsc);
 762 }
 763
 764 static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
 765 {
 766         return to_svm(vcpu)->vmcb->save.rflags;
 767 }
 768
 769 static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 770 {
 771         to_svm(vcpu)->vmcb->save.rflags = rflags;
 772 }
 773
 774 static void svm_set_vintr(struct vcpu_svm *svm)
 775 {
 776         svm->vmcb->control.intercept |= 1ULL << INTERCEPT_VINTR;
 777 }
 778
 779 static void svm_clear_vintr(struct vcpu_svm *svm)
 780 {
 781         svm->vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR);
 782 }
 783
 784 static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
 785 {
 786         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
 787
 788         switch (seg) {
 789         case VCPU_SREG_CS: return &save->cs;
 790         case VCPU_SREG_DS: return &save->ds;
 791         case VCPU_SREG_ES: return &save->es;
 792         case VCPU_SREG_FS: return &save->fs;
 793         case VCPU_SREG_GS: return &save->gs;
 794         case VCPU_SREG_SS: return &save->ss;
 795         case VCPU_SREG_TR: return &save->tr;
 796         case VCPU_SREG_LDTR: return &save->ldtr;
 797         }
 798         BUG();
 799         return NULL;
 800 }
 801
 802 static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
 803 {
 804         struct vmcb_seg *s = svm_seg(vcpu, seg);
 805
 806         return s->base;
 807 }
 808
 809 static void svm_get_segment(struct kvm_vcpu *vcpu,
 810                             struct kvm_segment *var, int seg)
 811 {
 812         struct vmcb_seg *s = svm_seg(vcpu, seg);
 813
 814         var->base = s->base;
 815         var->limit = s->limit;
 816         var->selector = s->selector;
 817         var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
 818         var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
 819         var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
 820         var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
 821         var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
 822         var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
 823         var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
 824         var->g = (s->attrib >> SVM_SELECTOR_G_SHIFT) & 1;
 825
 826         /*
 827          * SVM always stores 0 for the 'G' bit in the CS selector in
 828          * the VMCB on a VMEXIT. This hurts cross-vendor migration:
 829          * Intel's VMENTRY has a check on the 'G' bit.
 830          */
 831         if (seg == VCPU_SREG_CS)
 832                 var->g = s->limit > 0xfffff;
 833
 834         /*
 835          * Work around a bug where the busy flag in the tr selector
 836          * isn't exposed
 837          */
 838         if (seg == VCPU_SREG_TR)
 839                 var->type |= 0x2;
 840
 841         var->unusable = !var->present;
 842 }
 843
 844 static int svm_get_cpl(struct kvm_vcpu *vcpu)
 845 {
 846         struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
 847
 848         return save->cpl;
 849 }
 850
 851 static void svm_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 852 {
 853         struct vcpu_svm *svm = to_svm(vcpu);
 854
 855         dt->limit = svm->vmcb->save.idtr.limit;
 856         dt->base = svm->vmcb->save.idtr.base;
 857 }
 858
 859 static void svm_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 860 {
 861         struct vcpu_svm *svm = to_svm(vcpu);
 862
 863         svm->vmcb->save.idtr.limit = dt->limit;
 864         svm->vmcb->save.idtr.base = dt->base ;
 865 }
 866
 867 static void svm_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 868 {
 869         struct vcpu_svm *svm = to_svm(vcpu);
 870
 871         dt->limit = svm->vmcb->save.gdtr.limit;
 872         dt->base = svm->vmcb->save.gdtr.base;
 873 }
 874
 875 static void svm_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
 876 {
 877         struct vcpu_svm *svm = to_svm(vcpu);
 878
 879         svm->vmcb->save.gdtr.limit = dt->limit;
 880         svm->vmcb->save.gdtr.base = dt->base ;
 881 }
 882
 883 static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
 884 {
 885 }
 886
 887 static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 888 {
 889         struct vcpu_svm *svm = to_svm(vcpu);
 890
 891 #ifdef CONFIG_X86_64
 892         if (vcpu->arch.shadow_efer & EFER_LME) {
 893                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 894                         vcpu->arch.shadow_efer |= EFER_LMA;
 895                         svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
 896                 }
 897
 898                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
 899                         vcpu->arch.shadow_efer &= ~EFER_LMA;
 900                         svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
 901                 }
 902         }
 903 #endif
 904         if (npt_enabled)
 905                 goto set;
 906
 907         if ((vcpu->arch.cr0 & X86_CR0_TS) && !(cr0 & X86_CR0_TS)) {
 908                 svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR);
 909                 vcpu->fpu_active = 1;
 910         }
 911
 912         vcpu->arch.cr0 = cr0;
 913         cr0 |= X86_CR0_PG | X86_CR0_WP;
 914         if (!vcpu->fpu_active) {
 915                 svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
 916                 cr0 |= X86_CR0_TS;
 917         }
 918 set:
 919         /*
 920          * re-enable caching here because the QEMU bios
 921          * does not do it - this results in some delay at
 922          * reboot
 923          */
 924         cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
 925         svm->vmcb->save.cr0 = cr0;
 926 }
 927
 928 static void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 929 {
 930         unsigned long host_cr4_mce = read_cr4() & X86_CR4_MCE;
 931         unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;
 932
 933         if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
 934                 force_new_asid(vcpu);
 935
 936         vcpu->arch.cr4 = cr4;
 937         if (!npt_enabled)
 938                 cr4 |= X86_CR4_PAE;
 939         cr4 |= host_cr4_mce;
 940         to_svm(vcpu)->vmcb->save.cr4 = cr4;
 941 }
 942
 943 static void svm_set_segment(struct kvm_vcpu *vcpu,
 944                             struct kvm_segment *var, int seg)
 945 {
 946         struct vcpu_svm *svm = to_svm(vcpu);
 947         struct vmcb_seg *s = svm_seg(vcpu, seg);
 948
 949         s->base = var->base;
 950         s->limit = var->limit;
 951         s->selector = var->selector;
 952         if (var->unusable)
 953                 s->attrib = 0;
 954         else {
 955                 s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
 956                 s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
 957                 s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
 958                 s->attrib |= (var->present & 1) << SVM_SELECTOR_P_SHIFT;
 959                 s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
 960                 s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
 961                 s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
 962                 s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
 963         }
 964         if (seg == VCPU_SREG_CS)
 965                 svm->vmcb->save.cpl
 966                         = (svm->vmcb->save.cs.attrib
 967                            >> SVM_SELECTOR_DPL_SHIFT) & 3;
 968
 969 }
 970
 971 static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
 972 {
 973         int old_debug = vcpu->guest_debug;
 974         struct vcpu_svm *svm = to_svm(vcpu);
 975
 976         vcpu->guest_debug = dbg->control;
 977
 978         svm->vmcb->control.intercept_exceptions &=
 979                 ~((1 << DB_VECTOR) | (1 << BP_VECTOR));
 980         if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
 981                 if (vcpu->guest_debug &
 982                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
 983                         svm->vmcb->control.intercept_exceptions |=
 984                                 1 << DB_VECTOR;
 985                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
 986                         svm->vmcb->control.intercept_exceptions |=
 987                                 1 << BP_VECTOR;
 988         } else
 989                 vcpu->guest_debug = 0;
 990
 991         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
 992                 svm->vmcb->save.rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
 993         else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
 994                 svm->vmcb->save.rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
 995
 996         return 0;
 997 }
 998
 999 static int svm_get_irq(struct kvm_vcpu *vcpu)
1000 {
1001         struct vcpu_svm *svm = to_svm(vcpu);
1002         u32 exit_int_info = svm->vmcb->control.exit_int_info;
1003
1004         if (is_external_interrupt(exit_int_info))
1005                 return exit_int_info & SVM_EVTINJ_VEC_MASK;
1006         return -1;
1007 }
1008
1009 static void load_host_msrs(struct kvm_vcpu *vcpu)
1010 {
1011 #ifdef CONFIG_X86_64
1012         wrmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
1013 #endif
1014 }
1015
1016 static void save_host_msrs(struct kvm_vcpu *vcpu)
1017 {
1018 #ifdef CONFIG_X86_64
1019         rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host_gs_base);
1020 #endif
1021 }
1022
1023 static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *svm_data)
1024 {
1025         if (svm_data->next_asid > svm_data->max_asid) {
1026                 ++svm_data->asid_generation;
1027                 svm_data->next_asid = 1;
1028                 svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
1029         }
1030
1031         svm->vcpu.cpu = svm_data->cpu;
1032         svm->asid_generation = svm_data->asid_generation;
1033         svm->vmcb->control.asid = svm_data->next_asid++;
1034 }
1035
1036 static unsigned long svm_get_dr(struct kvm_vcpu *vcpu, int dr)
1037 {
1038         unsigned long val = to_svm(vcpu)->db_regs[dr];
1039         KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
1040         return val;
1041 }
1042
1043 static void svm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long value,
1044                        int *exception)
1045 {
1046         struct vcpu_svm *svm = to_svm(vcpu);
1047
1048         *exception = 0;
1049
1050         if (svm->vmcb->save.dr7 & DR7_GD_MASK) {
1051                 svm->vmcb->save.dr7 &= ~DR7_GD_MASK;
1052                 svm->vmcb->save.dr6 |= DR6_BD_MASK;
1053                 *exception = DB_VECTOR;
1054                 return;
1055         }
1056
1057         switch (dr) {
1058         case 0 ... 3:
1059                 svm->db_regs[dr] = value;
1060                 return;
1061         case 4 ... 5:
1062                 if (vcpu->arch.cr4 & X86_CR4_DE) {
1063                         *exception = UD_VECTOR;
1064                         return;
1065                 }
1066         case 7: {
1067                 if (value & ~((1ULL << 32) - 1)) {
1068                         *exception = GP_VECTOR;
1069                         return;
1070                 }
1071                 svm->vmcb->save.dr7 = value;
1072                 return;
1073         }
1074         default:
1075                 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1076                        __func__, dr);
1077                 *exception = UD_VECTOR;
1078                 return;
1079         }
1080 }
1081
1082 static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1083 {
1084         u32 exit_int_info = svm->vmcb->control.exit_int_info;
1085         struct kvm *kvm = svm->vcpu.kvm;
1086         u64 fault_address;
1087         u32 error_code;
1088         bool event_injection = false;
1089
1090         if (!irqchip_in_kernel(kvm) &&
1091             is_external_interrupt(exit_int_info)) {
1092                 event_injection = true;
1093                 push_irq(&svm->vcpu, exit_int_info & SVM_EVTINJ_VEC_MASK);
1094         }
1095
1096         fault_address  = svm->vmcb->control.exit_info_2;
1097         error_code = svm->vmcb->control.exit_info_1;
1098
1099         if (!npt_enabled)
1100                 KVMTRACE_3D(PAGE_FAULT, &svm->vcpu, error_code,
1101                             (u32)fault_address, (u32)(fault_address >> 32),
1102                             handler);
1103         else
1104                 KVMTRACE_3D(TDP_FAULT, &svm->vcpu, error_code,
1105                             (u32)fault_address, (u32)(fault_address >> 32),
1106                             handler);
1107         /*
1108          * FIXME: Tis shouldn't be necessary here, but there is a flush
1109          * missing in the MMU code. Until we find this bug, flush the
1110          * complete TLB here on an NPF
1111          */
1112         if (npt_enabled)
1113                 svm_flush_tlb(&svm->vcpu);
1114
1115         if (!npt_enabled && event_injection)
1116                 kvm_mmu_unprotect_page_virt(&svm->vcpu, fault_address);
1117         return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code);
1118 }
1119
1120 static int db_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1121 {
1122         if (!(svm->vcpu.guest_debug &
1123               (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
1124                 kvm_queue_exception(&svm->vcpu, DB_VECTOR);
1125                 return 1;
1126         }
1127         kvm_run->exit_reason = KVM_EXIT_DEBUG;
1128         kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1129         kvm_run->debug.arch.exception = DB_VECTOR;
1130         return 0;
1131 }
1132
1133 static int bp_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1134 {
1135         kvm_run->exit_reason = KVM_EXIT_DEBUG;
1136         kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
1137         kvm_run->debug.arch.exception = BP_VECTOR;
1138         return 0;
1139 }
1140
1141 static int ud_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1142 {
1143         int er;
1144
1145         er = emulate_instruction(&svm->vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
1146         if (er != EMULATE_DONE)
1147                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1148         return 1;
1149 }
1150
1151 static int nm_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1152 {
1153         svm->vmcb->control.intercept_exceptions &= ~(1 << NM_VECTOR);
1154         if (!(svm->vcpu.arch.cr0 & X86_CR0_TS))
1155                 svm->vmcb->save.cr0 &= ~X86_CR0_TS;
1156         svm->vcpu.fpu_active = 1;
1157
1158         return 1;
1159 }
1160
1161 static int mc_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1162 {
1163         /*
1164          * On an #MC intercept the MCE handler is not called automatically in
1165          * the host. So do it by hand here.
1166          */
1167         asm volatile (
1168                 "int $0x12\n");
1169         /* not sure if we ever come back to this point */
1170
1171         return 1;
1172 }
1173
1174 static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1175 {
1176         /*
1177          * VMCB is undefined after a SHUTDOWN intercept
1178          * so reinitialize it.
1179          */
1180         clear_page(svm->vmcb);
1181         init_vmcb(svm);
1182
1183         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
1184         return 0;
1185 }
1186
1187 static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1188 {
1189         u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
1190         int size, down, in, string, rep;
1191         unsigned port;
1192
1193         ++svm->vcpu.stat.io_exits;
1194
1195         svm->next_rip = svm->vmcb->control.exit_info_2;
1196
1197         string = (io_info & SVM_IOIO_STR_MASK) != 0;
1198
1199         if (string) {
1200                 if (emulate_instruction(&svm->vcpu,
1201                                         kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
1202                         return 0;
1203                 return 1;
1204         }
1205
1206         in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
1207         port = io_info >> 16;
1208         size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
1209         rep = (io_info & SVM_IOIO_REP_MASK) != 0;
1210         down = (svm->vmcb->save.rflags & X86_EFLAGS_DF) != 0;
1211
1212         skip_emulated_instruction(&svm->vcpu);
1213         return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);
1214 }
1215
1216 static int nmi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1217 {
1218         KVMTRACE_0D(NMI, &svm->vcpu, handler);
1219         return 1;
1220 }
1221
1222 static int intr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1223 {
1224         ++svm->vcpu.stat.irq_exits;
1225         KVMTRACE_0D(INTR, &svm->vcpu, handler);
1226         return 1;
1227 }
1228
1229 static int nop_on_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1230 {
1231         return 1;
1232 }
1233
1234 static int halt_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1235 {
1236         svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
1237         skip_emulated_instruction(&svm->vcpu);
1238         return kvm_emulate_halt(&svm->vcpu);
1239 }
1240
1241 static int vmmcall_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1242 {
1243         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1244         skip_emulated_instruction(&svm->vcpu);
1245         kvm_emulate_hypercall(&svm->vcpu);
1246         return 1;
1247 }
1248
1249 static int nested_svm_check_permissions(struct vcpu_svm *svm)
1250 {
1251         if (!(svm->vcpu.arch.shadow_efer & EFER_SVME)
1252             || !is_paging(&svm->vcpu)) {
1253                 kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1254                 return 1;
1255         }
1256
1257         if (svm->vmcb->save.cpl) {
1258                 kvm_inject_gp(&svm->vcpu, 0);
1259                 return 1;
1260         }
1261
1262        return 0;
1263 }
1264
1265 static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
1266                                       bool has_error_code, u32 error_code)
1267 {
1268         if (is_nested(svm)) {
1269                 svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
1270                 svm->vmcb->control.exit_code_hi = 0;
1271                 svm->vmcb->control.exit_info_1 = error_code;
1272                 svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
1273                 if (nested_svm_exit_handled(svm, false)) {
1274                         nsvm_printk("VMexit -> EXCP 0x%x\n", nr);
1275
1276                         nested_svm_vmexit(svm);
1277                         return 1;
1278                 }
1279         }
1280
1281         return 0;
1282 }
1283
1284 static inline int nested_svm_intr(struct vcpu_svm *svm)
1285 {
1286         if (is_nested(svm)) {
1287                 if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
1288                         return 0;
1289
1290                 if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
1291                         return 0;
1292
1293                 svm->vmcb->control.exit_code = SVM_EXIT_INTR;
1294
1295                 if (nested_svm_exit_handled(svm, false)) {
1296                         nsvm_printk("VMexit -> INTR\n");
1297                         nested_svm_vmexit(svm);
1298                         return 1;
1299                 }
1300         }
1301
1302         return 0;
1303 }
1304
1305 static struct page *nested_svm_get_page(struct vcpu_svm *svm, u64 gpa)
1306 {
1307         struct page *page;
1308
1309         down_read(&current->mm->mmap_sem);
1310         page = gfn_to_page(svm->vcpu.kvm, gpa >> PAGE_SHIFT);
1311         up_read(&current->mm->mmap_sem);
1312
1313         if (is_error_page(page)) {
1314                 printk(KERN_INFO "%s: could not find page at 0x%llx\n",
1315                        __func__, gpa);
1316                 kvm_release_page_clean(page);
1317                 kvm_inject_gp(&svm->vcpu, 0);
1318                 return NULL;
1319         }
1320         return page;
1321 }
1322
1323 static int nested_svm_do(struct vcpu_svm *svm,
1324                          u64 arg1_gpa, u64 arg2_gpa, void *opaque,
1325                          int (*handler)(struct vcpu_svm *svm,
1326                                         void *arg1,
1327                                         void *arg2,
1328                                         void *opaque))
1329 {
1330         struct page *arg1_page;
1331         struct page *arg2_page = NULL;
1332         void *arg1;
1333         void *arg2 = NULL;
1334         int retval;
1335
1336         arg1_page = nested_svm_get_page(svm, arg1_gpa);
1337         if(arg1_page == NULL)
1338                 return 1;
1339
1340         if (arg2_gpa) {
1341                 arg2_page = nested_svm_get_page(svm, arg2_gpa);
1342                 if(arg2_page == NULL) {
1343                         kvm_release_page_clean(arg1_page);
1344                         return 1;
1345                 }
1346         }
1347
1348         arg1 = kmap_atomic(arg1_page, KM_USER0);
1349         if (arg2_gpa)
1350                 arg2 = kmap_atomic(arg2_page, KM_USER1);
1351
1352         retval = handler(svm, arg1, arg2, opaque);
1353
1354         kunmap_atomic(arg1, KM_USER0);
1355         if (arg2_gpa)
1356                 kunmap_atomic(arg2, KM_USER1);
1357
1358         kvm_release_page_dirty(arg1_page);
1359         if (arg2_gpa)
1360                 kvm_release_page_dirty(arg2_page);
1361
1362         return retval;
1363 }
1364
1365 static int nested_svm_exit_handled_real(struct vcpu_svm *svm,
1366                                         void *arg1,
1367                                         void *arg2,
1368                                         void *opaque)
1369 {
1370         struct vmcb *nested_vmcb = (struct vmcb *)arg1;
1371         bool kvm_overrides = *(bool *)opaque;
1372         u32 exit_code = svm->vmcb->control.exit_code;
1373
1374         if (kvm_overrides) {
1375                 switch (exit_code) {
1376                 case SVM_EXIT_INTR:
1377                 case SVM_EXIT_NMI:
1378                         return 0;
1379                 /* For now we are always handling NPFs when using them */
1380                 case SVM_EXIT_NPF:
1381                         if (npt_enabled)
1382                                 return 0;
1383                         break;
1384                 /* When we're shadowing, trap PFs */
1385                 case SVM_EXIT_EXCP_BASE + PF_VECTOR:
1386                         if (!npt_enabled)
1387                                 return 0;
1388                         break;
1389                 default:
1390                         break;
1391                 }
1392         }
1393
1394         switch (exit_code) {
1395         case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR8: {
1396                 u32 cr_bits = 1 << (exit_code - SVM_EXIT_READ_CR0);
1397                 if (nested_vmcb->control.intercept_cr_read & cr_bits)
1398                         return 1;
1399                 break;
1400         }
1401         case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR8: {
1402                 u32 cr_bits = 1 << (exit_code - SVM_EXIT_WRITE_CR0);
1403                 if (nested_vmcb->control.intercept_cr_write & cr_bits)
1404                         return 1;
1405                 break;
1406         }
1407         case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR7: {
1408                 u32 dr_bits = 1 << (exit_code - SVM_EXIT_READ_DR0);
1409                 if (nested_vmcb->control.intercept_dr_read & dr_bits)
1410                         return 1;
1411                 break;
1412         }
1413         case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR7: {
1414                 u32 dr_bits = 1 << (exit_code - SVM_EXIT_WRITE_DR0);
1415                 if (nested_vmcb->control.intercept_dr_write & dr_bits)
1416                         return 1;
1417                 break;
1418         }
1419         case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
1420                 u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
1421                 if (nested_vmcb->control.intercept_exceptions & excp_bits)
1422                         return 1;
1423                 break;
1424         }
1425         default: {
1426                 u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
1427                 nsvm_printk("exit code: 0x%x\n", exit_code);
1428                 if (nested_vmcb->control.intercept & exit_bits)
1429                         return 1;
1430         }
1431         }
1432
1433         return 0;
1434 }
1435
1436 static int nested_svm_exit_handled_msr(struct vcpu_svm *svm,
1437                                        void *arg1, void *arg2,
1438                                        void *opaque)
1439 {
1440         struct vmcb *nested_vmcb = (struct vmcb *)arg1;
1441         u8 *msrpm = (u8 *)arg2;
1442         u32 t0, t1;
1443         u32 msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
1444         u32 param = svm->vmcb->control.exit_info_1 & 1;
1445
1446         if (!(nested_vmcb->control.intercept & (1ULL << INTERCEPT_MSR_PROT)))
1447                 return 0;
1448
1449         switch(msr) {
1450         case 0 ... 0x1fff:
1451                 t0 = (msr * 2) % 8;
1452                 t1 = msr / 8;
1453                 break;
1454         case 0xc0000000 ... 0xc0001fff:
1455                 t0 = (8192 + msr - 0xc0000000) * 2;
1456                 t1 = (t0 / 8);
1457                 t0 %= 8;
1458                 break;
1459         case 0xc0010000 ... 0xc0011fff:
1460                 t0 = (16384 + msr - 0xc0010000) * 2;
1461                 t1 = (t0 / 8);
1462                 t0 %= 8;
1463                 break;
1464         default:
1465                 return 1;
1466                 break;
1467         }
1468         if (msrpm[t1] & ((1 << param) << t0))
1469                 return 1;
1470
1471         return 0;
1472 }
1473
1474 static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override)
1475 {
1476         bool k = kvm_override;
1477
1478         switch (svm->vmcb->control.exit_code) {
1479         case SVM_EXIT_MSR:
1480                 return nested_svm_do(svm, svm->nested_vmcb,
1481                                      svm->nested_vmcb_msrpm, NULL,
1482                                      nested_svm_exit_handled_msr);
1483         default: break;
1484         }
1485
1486         return nested_svm_do(svm, svm->nested_vmcb, 0, &k,
1487                              nested_svm_exit_handled_real);
1488 }
1489
1490 static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
1491                                   void *arg2, void *opaque)
1492 {
1493         struct vmcb *nested_vmcb = (struct vmcb *)arg1;
1494         struct vmcb *hsave = svm->hsave;
1495         u64 nested_save[] = { nested_vmcb->save.cr0,
1496                               nested_vmcb->save.cr3,
1497                               nested_vmcb->save.cr4,
1498                               nested_vmcb->save.efer,
1499                               nested_vmcb->control.intercept_cr_read,
1500                               nested_vmcb->control.intercept_cr_write,
1501                               nested_vmcb->control.intercept_dr_read,
1502                               nested_vmcb->control.intercept_dr_write,
1503                               nested_vmcb->control.intercept_exceptions,
1504                               nested_vmcb->control.intercept,
1505                               nested_vmcb->control.msrpm_base_pa,
1506                               nested_vmcb->control.iopm_base_pa,
1507                               nested_vmcb->control.tsc_offset };
1508
1509         /* Give the current vmcb to the guest */
1510         memcpy(nested_vmcb, svm->vmcb, sizeof(struct vmcb));
1511         nested_vmcb->save.cr0 = nested_save[0];
1512         if (!npt_enabled)
1513                 nested_vmcb->save.cr3 = nested_save[1];
1514         nested_vmcb->save.cr4 = nested_save[2];
1515         nested_vmcb->save.efer = nested_save[3];
1516         nested_vmcb->control.intercept_cr_read = nested_save[4];
1517         nested_vmcb->control.intercept_cr_write = nested_save[5];
1518         nested_vmcb->control.intercept_dr_read = nested_save[6];
1519         nested_vmcb->control.intercept_dr_write = nested_save[7];
1520         nested_vmcb->control.intercept_exceptions = nested_save[8];
1521         nested_vmcb->control.intercept = nested_save[9];
1522         nested_vmcb->control.msrpm_base_pa = nested_save[10];
1523         nested_vmcb->control.iopm_base_pa = nested_save[11];
1524         nested_vmcb->control.tsc_offset = nested_save[12];
1525
1526         /* We always set V_INTR_MASKING and remember the old value in hflags */
1527         if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
1528                 nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
1529
1530         if ((nested_vmcb->control.int_ctl & V_IRQ_MASK) &&
1531             (nested_vmcb->control.int_vector)) {
1532                 nsvm_printk("WARNING: IRQ 0x%x still enabled on #VMEXIT\n",
1533                                 nested_vmcb->control.int_vector);
1534         }
1535
1536         /* Restore the original control entries */
1537         svm->vmcb->control = hsave->control;
1538
1539         /* Kill any pending exceptions */
1540         if (svm->vcpu.arch.exception.pending == true)
1541                 nsvm_printk("WARNING: Pending Exception\n");
1542         svm->vcpu.arch.exception.pending = false;
1543
1544         /* Restore selected save entries */
1545         svm->vmcb->save.es = hsave->save.es;
1546         svm->vmcb->save.cs = hsave->save.cs;
1547         svm->vmcb->save.ss = hsave->save.ss;
1548         svm->vmcb->save.ds = hsave->save.ds;
1549         svm->vmcb->save.gdtr = hsave->save.gdtr;
1550         svm->vmcb->save.idtr = hsave->save.idtr;
1551         svm->vmcb->save.rflags = hsave->save.rflags;
1552         svm_set_efer(&svm->vcpu, hsave->save.efer);
1553         svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
1554         svm_set_cr4(&svm->vcpu, hsave->save.cr4);
1555         if (npt_enabled) {
1556                 svm->vmcb->save.cr3 = hsave->save.cr3;
1557                 svm->vcpu.arch.cr3 = hsave->save.cr3;
1558         } else {
1559                 kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
1560         }
1561         kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
1562         kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
1563         kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
1564         svm->vmcb->save.dr7 = 0;
1565         svm->vmcb->save.cpl = 0;
1566         svm->vmcb->control.exit_int_info = 0;
1567
1568         svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
1569         /* Exit nested SVM mode */
1570         svm->nested_vmcb = 0;
1571
1572         return 0;
1573 }
1574
1575 static int nested_svm_vmexit(struct vcpu_svm *svm)
1576 {
1577         nsvm_printk("VMexit\n");
1578         if (nested_svm_do(svm, svm->nested_vmcb, 0,
1579                           NULL, nested_svm_vmexit_real))
1580                 return 1;
1581
1582         kvm_mmu_reset_context(&svm->vcpu);
1583         kvm_mmu_load(&svm->vcpu);
1584
1585         return 0;
1586 }
1587
1588 static int nested_svm_vmrun_msrpm(struct vcpu_svm *svm, void *arg1,
1589                                   void *arg2, void *opaque)
1590 {
1591         int i;
1592         u32 *nested_msrpm = (u32*)arg1;
1593         for (i=0; i< PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER) / 4; i++)
1594                 svm->nested_msrpm[i] = svm->msrpm[i] | nested_msrpm[i];
1595         svm->vmcb->control.msrpm_base_pa = __pa(svm->nested_msrpm);
1596
1597         return 0;
1598 }
1599
1600 static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
1601                             void *arg2, void *opaque)
1602 {
1603         struct vmcb *nested_vmcb = (struct vmcb *)arg1;
1604         struct vmcb *hsave = svm->hsave;
1605
1606         /* nested_vmcb is our indicator if nested SVM is activated */
1607         svm->nested_vmcb = svm->vmcb->save.rax;
1608
1609         /* Clear internal status */
1610         svm->vcpu.arch.exception.pending = false;
1611
1612         /* Save the old vmcb, so we don't need to pick what we save, but
1613            can restore everything when a VMEXIT occurs */
1614         memcpy(hsave, svm->vmcb, sizeof(struct vmcb));
1615         /* We need to remember the original CR3 in the SPT case */
1616         if (!npt_enabled)
1617                 hsave->save.cr3 = svm->vcpu.arch.cr3;
1618         hsave->save.cr4 = svm->vcpu.arch.cr4;
1619         hsave->save.rip = svm->next_rip;
1620
1621         if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
1622                 svm->vcpu.arch.hflags |= HF_HIF_MASK;
1623         else
1624                 svm->vcpu.arch.hflags &= ~HF_HIF_MASK;
1625
1626         /* Load the nested guest state */
1627         svm->vmcb->save.es = nested_vmcb->save.es;
1628         svm->vmcb->save.cs = nested_vmcb->save.cs;
1629         svm->vmcb->save.ss = nested_vmcb->save.ss;
1630         svm->vmcb->save.ds = nested_vmcb->save.ds;
1631         svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
1632         svm->vmcb->save.idtr = nested_vmcb->save.idtr;
1633         svm->vmcb->save.rflags = nested_vmcb->save.rflags;
1634         svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
1635         svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
1636         svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
1637         if (npt_enabled) {
1638                 svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
1639                 svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
1640         } else {
1641                 kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
1642                 kvm_mmu_reset_context(&svm->vcpu);
1643         }
1644         svm->vmcb->save.cr2 = nested_vmcb->save.cr2;
1645         kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
1646         kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
1647         kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
1648         /* In case we don't even reach vcpu_run, the fields are not updated */
1649         svm->vmcb->save.rax = nested_vmcb->save.rax;
1650         svm->vmcb->save.rsp = nested_vmcb->save.rsp;
1651         svm->vmcb->save.rip = nested_vmcb->save.rip;
1652         svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
1653         svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
1654         svm->vmcb->save.cpl = nested_vmcb->save.cpl;
1655
1656         /* We don't want a nested guest to be more powerful than the guest,
1657            so all intercepts are ORed */
1658         svm->vmcb->control.intercept_cr_read |=
1659                 nested_vmcb->control.intercept_cr_read;
1660         svm->vmcb->control.intercept_cr_write |=
1661                 nested_vmcb->control.intercept_cr_write;
1662         svm->vmcb->control.intercept_dr_read |=
1663                 nested_vmcb->control.intercept_dr_read;
1664         svm->vmcb->control.intercept_dr_write |=
1665                 nested_vmcb->control.intercept_dr_write;
1666         svm->vmcb->control.intercept_exceptions |=
1667                 nested_vmcb->control.intercept_exceptions;
1668
1669         svm->vmcb->control.intercept |= nested_vmcb->control.intercept;
1670
1671         svm->nested_vmcb_msrpm = nested_vmcb->control.msrpm_base_pa;
1672
1673         force_new_asid(&svm->vcpu);
1674         svm->vmcb->control.exit_int_info = nested_vmcb->control.exit_int_info;
1675         svm->vmcb->control.exit_int_info_err = nested_vmcb->control.exit_int_info_err;
1676         svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
1677         if (nested_vmcb->control.int_ctl & V_IRQ_MASK) {
1678                 nsvm_printk("nSVM Injecting Interrupt: 0x%x\n",
1679                                 nested_vmcb->control.int_ctl);
1680         }
1681         if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
1682                 svm->vcpu.arch.hflags |= HF_VINTR_MASK;
1683         else
1684                 svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
1685
1686         nsvm_printk("nSVM exit_int_info: 0x%x | int_state: 0x%x\n",
1687                         nested_vmcb->control.exit_int_info,
1688                         nested_vmcb->control.int_state);
1689
1690         svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
1691         svm->vmcb->control.int_state = nested_vmcb->control.int_state;
1692         svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
1693         if (nested_vmcb->control.event_inj & SVM_EVTINJ_VALID)
1694                 nsvm_printk("Injecting Event: 0x%x\n",
1695                                 nested_vmcb->control.event_inj);
1696         svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
1697         svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
1698
1699         svm->vcpu.arch.hflags |= HF_GIF_MASK;
1700
1701         return 0;
1702 }
1703
1704 static int nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
1705 {
1706         to_vmcb->save.fs = from_vmcb->save.fs;
1707         to_vmcb->save.gs = from_vmcb->save.gs;
1708         to_vmcb->save.tr = from_vmcb->save.tr;
1709         to_vmcb->save.ldtr = from_vmcb->save.ldtr;
1710         to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
1711         to_vmcb->save.star = from_vmcb->save.star;
1712         to_vmcb->save.lstar = from_vmcb->save.lstar;
1713         to_vmcb->save.cstar = from_vmcb->save.cstar;
1714         to_vmcb->save.sfmask = from_vmcb->save.sfmask;
1715         to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
1716         to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
1717         to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
1718
1719         return 1;
1720 }
1721
1722 static int nested_svm_vmload(struct vcpu_svm *svm, void *nested_vmcb,
1723                              void *arg2, void *opaque)
1724 {
1725         return nested_svm_vmloadsave((struct vmcb *)nested_vmcb, svm->vmcb);
1726 }
1727
1728 static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
1729                              void *arg2, void *opaque)
1730 {
1731         return nested_svm_vmloadsave(svm->vmcb, (struct vmcb *)nested_vmcb);
1732 }
1733
1734 static int vmload_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1735 {
1736         if (nested_svm_check_permissions(svm))
1737                 return 1;
1738
1739         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1740         skip_emulated_instruction(&svm->vcpu);
1741
1742         nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmload);
1743
1744         return 1;
1745 }
1746
1747 static int vmsave_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1748 {
1749         if (nested_svm_check_permissions(svm))
1750                 return 1;
1751
1752         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1753         skip_emulated_instruction(&svm->vcpu);
1754
1755         nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmsave);
1756
1757         return 1;
1758 }
1759
1760 static int vmrun_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1761 {
1762         nsvm_printk("VMrun\n");
1763         if (nested_svm_check_permissions(svm))
1764                 return 1;
1765
1766         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1767         skip_emulated_instruction(&svm->vcpu);
1768
1769         if (nested_svm_do(svm, svm->vmcb->save.rax, 0,
1770                           NULL, nested_svm_vmrun))
1771                 return 1;
1772
1773         if (nested_svm_do(svm, svm->nested_vmcb_msrpm, 0,
1774                       NULL, nested_svm_vmrun_msrpm))
1775                 return 1;
1776
1777         return 1;
1778 }
1779
1780 static int stgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1781 {
1782         if (nested_svm_check_permissions(svm))
1783                 return 1;
1784
1785         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1786         skip_emulated_instruction(&svm->vcpu);
1787
1788         svm->vcpu.arch.hflags |= HF_GIF_MASK;
1789
1790         return 1;
1791 }
1792
1793 static int clgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1794 {
1795         if (nested_svm_check_permissions(svm))
1796                 return 1;
1797
1798         svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
1799         skip_emulated_instruction(&svm->vcpu);
1800
1801         svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
1802
1803         /* After a CLGI no interrupts should come */
1804         svm_clear_vintr(svm);
1805         svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
1806
1807         return 1;
1808 }
1809
1810 static int invalid_op_interception(struct vcpu_svm *svm,
1811                                    struct kvm_run *kvm_run)
1812 {
1813         kvm_queue_exception(&svm->vcpu, UD_VECTOR);
1814         return 1;
1815 }
1816
1817 static int task_switch_interception(struct vcpu_svm *svm,
1818                                     struct kvm_run *kvm_run)
1819 {
1820         u16 tss_selector;
1821
1822         tss_selector = (u16)svm->vmcb->control.exit_info_1;
1823         if (svm->vmcb->control.exit_info_2 &
1824             (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
1825                 return kvm_task_switch(&svm->vcpu, tss_selector,
1826                                        TASK_SWITCH_IRET);
1827         if (svm->vmcb->control.exit_info_2 &
1828             (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
1829                 return kvm_task_switch(&svm->vcpu, tss_selector,
1830                                        TASK_SWITCH_JMP);
1831         return kvm_task_switch(&svm->vcpu, tss_selector, TASK_SWITCH_CALL);
1832 }
1833
1834 static int cpuid_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1835 {
1836         svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
1837         kvm_emulate_cpuid(&svm->vcpu);
1838         return 1;
1839 }
1840
1841 static int invlpg_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1842 {
1843         if (emulate_instruction(&svm->vcpu, kvm_run, 0, 0, 0) != EMULATE_DONE)
1844                 pr_unimpl(&svm->vcpu, "%s: failed\n", __func__);
1845         return 1;
1846 }
1847
1848 static int emulate_on_interception(struct vcpu_svm *svm,
1849                                    struct kvm_run *kvm_run)
1850 {
1851         if (emulate_instruction(&svm->vcpu, NULL, 0, 0, 0) != EMULATE_DONE)
1852                 pr_unimpl(&svm->vcpu, "%s: failed\n", __func__);
1853         return 1;
1854 }
1855
1856 static int cr8_write_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1857 {
1858         emulate_instruction(&svm->vcpu, NULL, 0, 0, 0);
1859         if (irqchip_in_kernel(svm->vcpu.kvm))
1860                 return 1;
1861         kvm_run->exit_reason = KVM_EXIT_SET_TPR;
1862         return 0;
1863 }
1864
1865 static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
1866 {
1867         struct vcpu_svm *svm = to_svm(vcpu);
1868
1869         switch (ecx) {
1870         case MSR_IA32_TIME_STAMP_COUNTER: {
1871                 u64 tsc;
1872
1873                 rdtscll(tsc);
1874                 *data = svm->vmcb->control.tsc_offset + tsc;
1875                 break;
1876         }
1877         case MSR_K6_STAR:
1878                 *data = svm->vmcb->save.star;
1879                 break;
1880 #ifdef CONFIG_X86_64
1881         case MSR_LSTAR:
1882                 *data = svm->vmcb->save.lstar;
1883                 break;
1884         case MSR_CSTAR:
1885                 *data = svm->vmcb->save.cstar;
1886                 break;
1887         case MSR_KERNEL_GS_BASE:
1888                 *data = svm->vmcb->save.kernel_gs_base;
1889                 break;
1890         case MSR_SYSCALL_MASK:
1891                 *data = svm->vmcb->save.sfmask;
1892                 break;
1893 #endif
1894         case MSR_IA32_SYSENTER_CS:
1895                 *data = svm->vmcb->save.sysenter_cs;
1896                 break;
1897         case MSR_IA32_SYSENTER_EIP:
1898                 *data = svm->vmcb->save.sysenter_eip;
1899                 break;
1900         case MSR_IA32_SYSENTER_ESP:
1901                 *data = svm->vmcb->save.sysenter_esp;
1902                 break;
1903         /* Nobody will change the following 5 values in the VMCB so
1904            we can safely return them on rdmsr. They will always be 0
1905            until LBRV is implemented. */
1906         case MSR_IA32_DEBUGCTLMSR:
1907                 *data = svm->vmcb->save.dbgctl;
1908                 break;
1909         case MSR_IA32_LASTBRANCHFROMIP:
1910                 *data = svm->vmcb->save.br_from;
1911                 break;
1912         case MSR_IA32_LASTBRANCHTOIP:
1913                 *data = svm->vmcb->save.br_to;
1914                 break;
1915         case MSR_IA32_LASTINTFROMIP:
1916                 *data = svm->vmcb->save.last_excp_from;
1917                 break;
1918         case MSR_IA32_LASTINTTOIP:
1919                 *data = svm->vmcb->save.last_excp_to;
1920                 break;
1921         case MSR_VM_HSAVE_PA:
1922                 *data = svm->hsave_msr;
1923                 break;
1924         case MSR_VM_CR:
1925                 *data = 0;
1926                 break;
1927         default:
1928                 return kvm_get_msr_common(vcpu, ecx, data);
1929         }
1930         return 0;
1931 }
1932
1933 static int rdmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
1934 {
1935         u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
1936         u64 data;
1937
1938         if (svm_get_msr(&svm->vcpu, ecx, &data))
1939                 kvm_inject_gp(&svm->vcpu, 0);
1940         else {
1941                 KVMTRACE_3D(MSR_READ, &svm->vcpu, ecx, (u32)data,
1942                             (u32)(data >> 32), handler);
1943
1944                 svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
1945                 svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
1946                 svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
1947                 skip_emulated_instruction(&svm->vcpu);
1948         }
1949         return 1;
1950 }
1951
1952 static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
1953 {
1954         struct vcpu_svm *svm = to_svm(vcpu);
1955
1956         switch (ecx) {
1957         case MSR_IA32_TIME_STAMP_COUNTER: {
1958                 u64 tsc;
1959
1960                 rdtscll(tsc);
1961                 svm->vmcb->control.tsc_offset = data - tsc;
1962                 break;
1963         }
1964         case MSR_K6_STAR:
1965                 svm->vmcb->save.star = data;
1966                 break;
1967 #ifdef CONFIG_X86_64
1968         case MSR_LSTAR:
1969                 svm->vmcb->save.lstar = data;
1970                 break;
1971         case MSR_CSTAR:
1972                 svm->vmcb->save.cstar = data;
1973                 break;
1974         case MSR_KERNEL_GS_BASE:
1975                 svm->vmcb->save.kernel_gs_base = data;
1976                 break;
1977         case MSR_SYSCALL_MASK:
1978                 svm->vmcb->save.sfmask = data;
1979                 break;
1980 #endif
1981         case MSR_IA32_SYSENTER_CS:
1982                 svm->vmcb->save.sysenter_cs = data;
1983                 break;
1984         case MSR_IA32_SYSENTER_EIP:
1985                 svm->vmcb->save.sysenter_eip = data;
1986                 break;
1987         case MSR_IA32_SYSENTER_ESP:
1988                 svm->vmcb->save.sysenter_esp = data;
1989                 break;
1990         case MSR_IA32_DEBUGCTLMSR:
1991                 if (!svm_has(SVM_FEATURE_LBRV)) {
1992                         pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
1993                                         __func__, data);
1994                         break;
1995                 }
1996                 if (data & DEBUGCTL_RESERVED_BITS)
1997                         return 1;
1998
1999                 svm->vmcb->save.dbgctl = data;
2000                 if (data & (1ULL<<0))
2001                         svm_enable_lbrv(svm);
2002                 else
2003                         svm_disable_lbrv(svm);
2004                 break;
2005         case MSR_K7_EVNTSEL0:
2006         case MSR_K7_EVNTSEL1:
2007         case MSR_K7_EVNTSEL2:
2008         case MSR_K7_EVNTSEL3:
2009         case MSR_K7_PERFCTR0:
2010         case MSR_K7_PERFCTR1:
2011         case MSR_K7_PERFCTR2:
2012         case MSR_K7_PERFCTR3:
2013                 /*
2014                  * Just discard all writes to the performance counters; this
2015                  * should keep both older linux and windows 64-bit guests
2016                  * happy
2017                  */
2018                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", ecx, data);
2019
2020                 break;
2021         case MSR_VM_HSAVE_PA:
2022                 svm->hsave_msr = data;
2023                 break;
2024         default:
2025                 return kvm_set_msr_common(vcpu, ecx, data);
2026         }
2027         return 0;
2028 }
2029
2030 static int wrmsr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
2031 {
2032         u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
2033         u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u)
2034                 | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32);
2035
2036         KVMTRACE_3D(MSR_WRITE, &svm->vcpu, ecx, (u32)data, (u32)(data >> 32),
2037                     handler);
2038
2039         svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
2040         if (svm_set_msr(&svm->vcpu, ecx, data))
2041                 kvm_inject_gp(&svm->vcpu, 0);
2042         else
2043                 skip_emulated_instruction(&svm->vcpu);
2044         return 1;
2045 }
2046
2047 static int msr_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
2048 {
2049         if (svm->vmcb->control.exit_info_1)
2050                 return wrmsr_interception(svm, kvm_run);
2051         else
2052                 return rdmsr_interception(svm, kvm_run);
2053 }
2054
2055 static int interrupt_window_interception(struct vcpu_svm *svm,
2056                                    struct kvm_run *kvm_run)
2057 {
2058         KVMTRACE_0D(PEND_INTR, &svm->vcpu, handler);
2059
2060         svm_clear_vintr(svm);
2061         svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
2062         /*
2063          * If the user space waits to inject interrupts, exit as soon as
2064          * possible
2065          */
2066         if (kvm_run->request_interrupt_window &&
2067             !svm->vcpu.arch.irq_summary) {
2068                 ++svm->vcpu.stat.irq_window_exits;
2069                 kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
2070                 return 0;
2071         }
2072
2073         return 1;
2074 }
2075
2076 static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
2077                                       struct kvm_run *kvm_run) = {
2078         [SVM_EXIT_READ_CR0]                     = emulate_on_interception,
2079         [SVM_EXIT_READ_CR3]                     = emulate_on_interception,
2080         [SVM_EXIT_READ_CR4]                     = emulate_on_interception,
2081         [SVM_EXIT_READ_CR8]                     = emulate_on_interception,
2082         /* for now: */
2083         [SVM_EXIT_WRITE_CR0]                    = emulate_on_interception,
2084         [SVM_EXIT_WRITE_CR3]                    = emulate_on_interception,
2085         [SVM_EXIT_WRITE_CR4]                    = emulate_on_interception,
2086         [SVM_EXIT_WRITE_CR8]                    = cr8_write_interception,
2087         [SVM_EXIT_READ_DR0]                     = emulate_on_interception,
2088         [SVM_EXIT_READ_DR1]                     = emulate_on_interception,
2089         [SVM_EXIT_READ_DR2]                     = emulate_on_interception,
2090         [SVM_EXIT_READ_DR3]                     = emulate_on_interception,
2091         [SVM_EXIT_WRITE_DR0]                    = emulate_on_interception,
2092         [SVM_EXIT_WRITE_DR1]                    = emulate_on_interception,
2093         [SVM_EXIT_WRITE_DR2]                    = emulate_on_interception,
2094         [SVM_EXIT_WRITE_DR3]                    = emulate_on_interception,
2095         [SVM_EXIT_WRITE_DR5]                    = emulate_on_interception,
2096         [SVM_EXIT_WRITE_DR7]                    = emulate_on_interception,
2097         [SVM_EXIT_EXCP_BASE + DB_VECTOR]        = db_interception,
2098         [SVM_EXIT_EXCP_BASE + BP_VECTOR]        = bp_interception,
2099         [SVM_EXIT_EXCP_BASE + UD_VECTOR]        = ud_interception,
2100         [SVM_EXIT_EXCP_BASE + PF_VECTOR]        = pf_interception,
2101         [SVM_EXIT_EXCP_BASE + NM_VECTOR]        = nm_interception,
2102         [SVM_EXIT_EXCP_BASE + MC_VECTOR]        = mc_interception,
2103         [SVM_EXIT_INTR]                         = intr_interception,
2104         [SVM_EXIT_NMI]                          = nmi_interception,
2105         [SVM_EXIT_SMI]                          = nop_on_interception,
2106         [SVM_EXIT_INIT]                         = nop_on_interception,
2107         [SVM_EXIT_VINTR]                        = interrupt_window_interception,
2108         /* [SVM_EXIT_CR0_SEL_WRITE]             = emulate_on_interception, */
2109         [SVM_EXIT_CPUID]                        = cpuid_interception,
2110         [SVM_EXIT_INVD]                         = emulate_on_interception,
2111         [SVM_EXIT_HLT]                          = halt_interception,
2112         [SVM_EXIT_INVLPG]                       = invlpg_interception,
2113         [SVM_EXIT_INVLPGA]                      = invalid_op_interception,
2114         [SVM_EXIT_IOIO]                         = io_interception,
2115         [SVM_EXIT_MSR]                          = msr_interception,
2116         [SVM_EXIT_TASK_SWITCH]                  = task_switch_interception,
2117         [SVM_EXIT_SHUTDOWN]                     = shutdown_interception,
2118         [SVM_EXIT_VMRUN]                        = vmrun_interception,
2119         [SVM_EXIT_VMMCALL]                      = vmmcall_interception,
2120         [SVM_EXIT_VMLOAD]                       = vmload_interception,
2121         [SVM_EXIT_VMSAVE]                       = vmsave_interception,
2122         [SVM_EXIT_STGI]                         = stgi_interception,
2123         [SVM_EXIT_CLGI]                         = clgi_interception,
2124         [SVM_EXIT_SKINIT]                       = invalid_op_interception,
2125         [SVM_EXIT_WBINVD]                       = emulate_on_interception,
2126         [SVM_EXIT_MONITOR]                      = invalid_op_interception,
2127         [SVM_EXIT_MWAIT]                        = invalid_op_interception,
2128         [SVM_EXIT_NPF]                          = pf_interception,
2129 };
2130
2131 static int handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
2132 {
2133         struct vcpu_svm *svm = to_svm(vcpu);
2134         u32 exit_code = svm->vmcb->control.exit_code;
2135
2136         KVMTRACE_3D(VMEXIT, vcpu, exit_code, (u32)svm->vmcb->save.rip,
2137                     (u32)((u64)svm->vmcb->save.rip >> 32), entryexit);
2138
2139         if (is_nested(svm)) {
2140                 nsvm_printk("nested handle_exit: 0x%x | 0x%lx | 0x%lx | 0x%lx\n",
2141                             exit_code, svm->vmcb->control.exit_info_1,
2142                             svm->vmcb->control.exit_info_2, svm->vmcb->save.rip);
2143                 if (nested_svm_exit_handled(svm, true)) {
2144                         nested_svm_vmexit(svm);
2145                         nsvm_printk("-> #VMEXIT\n");
2146                         return 1;
2147                 }
2148         }
2149
2150         if (npt_enabled) {
2151                 int mmu_reload = 0;
2152                 if ((vcpu->arch.cr0 ^ svm->vmcb->save.cr0) & X86_CR0_PG) {
2153                         svm_set_cr0(vcpu, svm->vmcb->save.cr0);
2154                         mmu_reload = 1;
2155                 }
2156                 vcpu->arch.cr0 = svm->vmcb->save.cr0;
2157                 vcpu->arch.cr3 = svm->vmcb->save.cr3;
2158                 if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
2159                         if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
2160                                 kvm_inject_gp(vcpu, 0);
2161                                 return 1;
2162                         }
2163                 }
2164                 if (mmu_reload) {
2165                         kvm_mmu_reset_context(vcpu);
2166                         kvm_mmu_load(vcpu);
2167                 }
2168         }
2169
2170         kvm_reput_irq(svm);
2171
2172         if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
2173                 kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
2174                 kvm_run->fail_entry.hardware_entry_failure_reason
2175                         = svm->vmcb->control.exit_code;
2176                 return 0;
2177         }
2178
2179         if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
2180             exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
2181             exit_code != SVM_EXIT_NPF)
2182                 printk(KERN_ERR "%s: unexpected exit_ini_info 0x%x "
2183                        "exit_code 0x%x\n",
2184                        __func__, svm->vmcb->control.exit_int_info,
2185                        exit_code);
2186
2187         if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
2188             || !svm_exit_handlers[exit_code]) {
2189                 kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
2190                 kvm_run->hw.hardware_exit_reason = exit_code;
2191                 return 0;
2192         }
2193
2194         return svm_exit_handlers[exit_code](svm, kvm_run);
2195 }
2196
2197 static void reload_tss(struct kvm_vcpu *vcpu)
2198 {
2199         int cpu = raw_smp_processor_id();
2200
2201         struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
2202         svm_data->tss_desc->type = 9; /* available 32/64-bit TSS */
2203         load_TR_desc();
2204 }
2205
2206 static void pre_svm_run(struct vcpu_svm *svm)
2207 {
2208         int cpu = raw_smp_processor_id();
2209
2210         struct svm_cpu_data *svm_data = per_cpu(svm_data, cpu);
2211
2212         svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;
2213         if (svm->vcpu.cpu != cpu ||
2214             svm->asid_generation != svm_data->asid_generation)
2215                 new_asid(svm, svm_data);
2216 }
2217
2218
2219 static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
2220 {
2221         struct vmcb_control_area *control;
2222
2223         KVMTRACE_1D(INJ_VIRQ, &svm->vcpu, (u32)irq, handler);
2224
2225         ++svm->vcpu.stat.irq_injections;
2226         control = &svm->vmcb->control;
2227         control->int_vector = irq;
2228         control->int_ctl &= ~V_INTR_PRIO_MASK;
2229         control->int_ctl |= V_IRQ_MASK |
2230                 ((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
2231 }
2232
2233 static void svm_set_irq(struct kvm_vcpu *vcpu, int irq)
2234 {
2235         struct vcpu_svm *svm = to_svm(vcpu);
2236
2237         nested_svm_intr(svm);
2238
2239         svm_inject_irq(svm, irq);
2240 }
2241
2242 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
2243 {
2244         struct vcpu_svm *svm = to_svm(vcpu);
2245         struct vmcb *vmcb = svm->vmcb;
2246         int max_irr, tpr;
2247
2248         if (!irqchip_in_kernel(vcpu->kvm) || vcpu->arch.apic->vapic_addr)
2249                 return;
2250
2251         vmcb->control.intercept_cr_write &= ~INTERCEPT_CR8_MASK;
2252
2253         max_irr = kvm_lapic_find_highest_irr(vcpu);
2254         if (max_irr == -1)
2255                 return;
2256
2257         tpr = kvm_lapic_get_cr8(vcpu) << 4;
2258
2259         if (tpr >= (max_irr & 0xf0))
2260                 vmcb->control.intercept_cr_write |= INTERCEPT_CR8_MASK;
2261 }
2262
2263 static void svm_intr_assist(struct kvm_vcpu *vcpu)
2264 {
2265         struct vcpu_svm *svm = to_svm(vcpu);
2266         struct vmcb *vmcb = svm->vmcb;
2267         int intr_vector = -1;
2268
2269         if ((vmcb->control.exit_int_info & SVM_EVTINJ_VALID) &&
2270             ((vmcb->control.exit_int_info & SVM_EVTINJ_TYPE_MASK) == 0)) {
2271                 intr_vector = vmcb->control.exit_int_info &
2272                               SVM_EVTINJ_VEC_MASK;
2273                 vmcb->control.exit_int_info = 0;
2274                 svm_inject_irq(svm, intr_vector);
2275                 goto out;
2276         }
2277
2278         if (vmcb->control.int_ctl & V_IRQ_MASK)
2279                 goto out;
2280
2281         if (!kvm_cpu_has_interrupt(vcpu))
2282                 goto out;
2283
2284         if (nested_svm_intr(svm))
2285                 goto out;
2286
2287         if (!(svm->vcpu.arch.hflags & HF_GIF_MASK))
2288                 goto out;
2289
2290         if (!(vmcb->save.rflags & X86_EFLAGS_IF) ||
2291             (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) ||
2292             (vmcb->control.event_inj & SVM_EVTINJ_VALID)) {
2293                 /* unable to deliver irq, set pending irq */
2294                 svm_set_vintr(svm);
2295                 svm_inject_irq(svm, 0x0);
2296                 goto out;
2297         }
2298         /* Okay, we can deliver the interrupt: grab it and update PIC state. */
2299         intr_vector = kvm_cpu_get_interrupt(vcpu);
2300         svm_inject_irq(svm, intr_vector);
2301 out:
2302         update_cr8_intercept(vcpu);
2303 }
2304
2305 static void kvm_reput_irq(struct vcpu_svm *svm)
2306 {
2307         struct vmcb_control_area *control = &svm->vmcb->control;
2308
2309         if ((control->int_ctl & V_IRQ_MASK)
2310             && !irqchip_in_kernel(svm->vcpu.kvm)) {
2311                 control->int_ctl &= ~V_IRQ_MASK;
2312                 push_irq(&svm->vcpu, control->int_vector);
2313         }
2314
2315         svm->vcpu.arch.interrupt_window_open =
2316                 !(control->int_state & SVM_INTERRUPT_SHADOW_MASK) &&
2317                  (svm->vcpu.arch.hflags & HF_GIF_MASK);
2318 }
2319
2320 static void svm_do_inject_vector(struct vcpu_svm *svm)
2321 {
2322         struct kvm_vcpu *vcpu = &svm->vcpu;
2323         int word_index = __ffs(vcpu->arch.irq_summary);
2324         int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
2325         int irq = word_index * BITS_PER_LONG + bit_index;
2326
2327         clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
2328         if (!vcpu->arch.irq_pending[word_index])
2329                 clear_bit(word_index, &vcpu->arch.irq_summary);
2330         svm_inject_irq(svm, irq);
2331 }
2332
2333 static void do_interrupt_requests(struct kvm_vcpu *vcpu,
2334                                        struct kvm_run *kvm_run)
2335 {
2336         struct vcpu_svm *svm = to_svm(vcpu);
2337         struct vmcb_control_area *control = &svm->vmcb->control;
2338
2339         if (nested_svm_intr(svm))
2340                 return;
2341
2342         svm->vcpu.arch.interrupt_window_open =
2343                 (!(control->int_state & SVM_INTERRUPT_SHADOW_MASK) &&
2344                  (svm->vmcb->save.rflags & X86_EFLAGS_IF) &&
2345                  (svm->vcpu.arch.hflags & HF_GIF_MASK));
2346
2347         if (svm->vcpu.arch.interrupt_window_open && svm->vcpu.arch.irq_summary)
2348                 /*
2349                  * If interrupts enabled, and not blocked by sti or mov ss. Good.
2350                  */
2351                 svm_do_inject_vector(svm);
2352
2353         /*
2354          * Interrupts blocked.  Wait for unblock.
2355          */
2356         if (!svm->vcpu.arch.interrupt_window_open &&
2357             (svm->vcpu.arch.irq_summary || kvm_run->request_interrupt_window))
2358                 svm_set_vintr(svm);
2359         else
2360                 svm_clear_vintr(svm);
2361 }
2362
2363 static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
2364 {
2365         return 0;
2366 }
2367
2368 static void save_db_regs(unsigned long *db_regs)
2369 {
2370         asm volatile ("mov %%dr0, %0" : "=r"(db_regs[0]));
2371         asm volatile ("mov %%dr1, %0" : "=r"(db_regs[1]));
2372         asm volatile ("mov %%dr2, %0" : "=r"(db_regs[2]));
2373         asm volatile ("mov %%dr3, %0" : "=r"(db_regs[3]));
2374 }
2375
2376 static void load_db_regs(unsigned long *db_regs)
2377 {
2378         asm volatile ("mov %0, %%dr0" : : "r"(db_regs[0]));
2379         asm volatile ("mov %0, %%dr1" : : "r"(db_regs[1]));
2380         asm volatile ("mov %0, %%dr2" : : "r"(db_regs[2]));
2381         asm volatile ("mov %0, %%dr3" : : "r"(db_regs[3]));
2382 }
2383
2384 static void svm_flush_tlb(struct kvm_vcpu *vcpu)
2385 {
2386         force_new_asid(vcpu);
2387 }
2388
2389 static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
2390 {
2391 }
2392
2393 static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
2394 {
2395         struct vcpu_svm *svm = to_svm(vcpu);
2396
2397         if (!(svm->vmcb->control.intercept_cr_write & INTERCEPT_CR8_MASK)) {
2398                 int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
2399                 kvm_lapic_set_tpr(vcpu, cr8);
2400         }
2401 }
2402
2403 static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
2404 {
2405         struct vcpu_svm *svm = to_svm(vcpu);
2406         u64 cr8;
2407
2408         if (!irqchip_in_kernel(vcpu->kvm))
2409                 return;
2410
2411         cr8 = kvm_get_cr8(vcpu);
2412         svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
2413         svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
2414 }
2415
2416 #ifdef CONFIG_X86_64
2417 #define R "r"
2418 #else
2419 #define R "e"
2420 #endif
2421
2422 static void svm_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2423 {
2424         struct vcpu_svm *svm = to_svm(vcpu);
2425         u16 fs_selector;
2426         u16 gs_selector;
2427         u16 ldt_selector;
2428
2429         svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
2430         svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
2431         svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];
2432
2433         pre_svm_run(svm);
2434
2435         sync_lapic_to_cr8(vcpu);
2436
2437         save_host_msrs(vcpu);
2438         fs_selector = kvm_read_fs();
2439         gs_selector = kvm_read_gs();
2440         ldt_selector = kvm_read_ldt();
2441         svm->host_cr2 = kvm_read_cr2();
2442         svm->host_dr6 = read_dr6();
2443         svm->host_dr7 = read_dr7();
2444         if (!is_nested(svm))
2445                 svm->vmcb->save.cr2 = vcpu->arch.cr2;
2446         /* required for live migration with NPT */
2447         if (npt_enabled)
2448                 svm->vmcb->save.cr3 = vcpu->arch.cr3;
2449
2450         if (svm->vmcb->save.dr7 & 0xff) {
2451                 write_dr7(0);
2452                 save_db_regs(svm->host_db_regs);
2453                 load_db_regs(svm->db_regs);
2454         }
2455
2456         clgi();
2457
2458         local_irq_enable();
2459
2460         asm volatile (
2461                 "push %%"R"bp; \n\t"
2462                 "mov %c[rbx](%[svm]), %%"R"bx \n\t"
2463                 "mov %c[rcx](%[svm]), %%"R"cx \n\t"
2464                 "mov %c[rdx](%[svm]), %%"R"dx \n\t"
2465                 "mov %c[rsi](%[svm]), %%"R"si \n\t"
2466                 "mov %c[rdi](%[svm]), %%"R"di \n\t"
2467                 "mov %c[rbp](%[svm]), %%"R"bp \n\t"
2468 #ifdef CONFIG_X86_64
2469                 "mov %c[r8](%[svm]),  %%r8  \n\t"
2470                 "mov %c[r9](%[svm]),  %%r9  \n\t"
2471                 "mov %c[r10](%[svm]), %%r10 \n\t"
2472                 "mov %c[r11](%[svm]), %%r11 \n\t"
2473                 "mov %c[r12](%[svm]), %%r12 \n\t"
2474                 "mov %c[r13](%[svm]), %%r13 \n\t"
2475                 "mov %c[r14](%[svm]), %%r14 \n\t"
2476                 "mov %c[r15](%[svm]), %%r15 \n\t"
2477 #endif
2478
2479                 /* Enter guest mode */
2480                 "push %%"R"ax \n\t"
2481                 "mov %c[vmcb](%[svm]), %%"R"ax \n\t"
2482                 __ex(SVM_VMLOAD) "\n\t"
2483                 __ex(SVM_VMRUN) "\n\t"
2484                 __ex(SVM_VMSAVE) "\n\t"
2485                 "pop %%"R"ax \n\t"
2486
2487                 /* Save guest registers, load host registers */
2488                 "mov %%"R"bx, %c[rbx](%[svm]) \n\t"
2489                 "mov %%"R"cx, %c[rcx](%[svm]) \n\t"
2490                 "mov %%"R"dx, %c[rdx](%[svm]) \n\t"
2491                 "mov %%"R"si, %c[rsi](%[svm]) \n\t"
2492                 "mov %%"R"di, %c[rdi](%[svm]) \n\t"
2493                 "mov %%"R"bp, %c[rbp](%[svm]) \n\t"
2494 #ifdef CONFIG_X86_64
2495                 "mov %%r8,  %c[r8](%[svm]) \n\t"
2496                 "mov %%r9,  %c[r9](%[svm]) \n\t"
2497                 "mov %%r10, %c[r10](%[svm]) \n\t"
2498                 "mov %%r11, %c[r11](%[svm]) \n\t"
2499                 "mov %%r12, %c[r12](%[svm]) \n\t"
2500                 "mov %%r13, %c[r13](%[svm]) \n\t"
2501                 "mov %%r14, %c[r14](%[svm]) \n\t"
2502                 "mov %%r15, %c[r15](%[svm]) \n\t"
2503 #endif
2504                 "pop %%"R"bp"
2505                 :
2506                 : [svm]"a"(svm),
2507                   [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
2508                   [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
2509                   [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
2510                   [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
2511                   [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
2512                   [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
2513                   [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
2514 #ifdef CONFIG_X86_64
2515                   , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
2516                   [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
2517                   [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
2518                   [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
2519                   [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
2520                   [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
2521                   [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
2522                   [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
2523 #endif
2524                 : "cc", "memory"
2525                 , R"bx", R"cx", R"dx", R"si", R"di"
2526 #ifdef CONFIG_X86_64
2527                 , "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
2528 #endif
2529                 );
2530
2531         if ((svm->vmcb->save.dr7 & 0xff))
2532                 load_db_regs(svm->host_db_regs);
2533
2534         vcpu->arch.cr2 = svm->vmcb->save.cr2;
2535         vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
2536         vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
2537         vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;
2538
2539         write_dr6(svm->host_dr6);
2540         write_dr7(svm->host_dr7);
2541         kvm_write_cr2(svm->host_cr2);
2542
2543         kvm_load_fs(fs_selector);
2544         kvm_load_gs(gs_selector);
2545         kvm_load_ldt(ldt_selector);
2546         load_host_msrs(vcpu);
2547
2548         reload_tss(vcpu);
2549
2550         local_irq_disable();
2551
2552         stgi();
2553
2554         sync_cr8_to_lapic(vcpu);
2555
2556         svm->next_rip = 0;
2557 }
2558
2559 #undef R
2560
2561 static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
2562 {
2563         struct vcpu_svm *svm = to_svm(vcpu);
2564
2565         if (npt_enabled) {
2566                 svm->vmcb->control.nested_cr3 = root;
2567                 force_new_asid(vcpu);
2568                 return;
2569         }
2570
2571         svm->vmcb->save.cr3 = root;
2572         force_new_asid(vcpu);
2573
2574         if (vcpu->fpu_active) {
2575                 svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
2576                 svm->vmcb->save.cr0 |= X86_CR0_TS;
2577                 vcpu->fpu_active = 0;
2578         }
2579 }
2580
2581 static int is_disabled(void)
2582 {
2583         u64 vm_cr;
2584
2585         rdmsrl(MSR_VM_CR, vm_cr);
2586         if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
2587                 return 1;
2588
2589         return 0;
2590 }
2591
2592 static void
2593 svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
2594 {
2595         /*
2596          * Patch in the VMMCALL instruction:
2597          */
2598         hypercall[0] = 0x0f;
2599         hypercall[1] = 0x01;
2600         hypercall[2] = 0xd9;
2601 }
2602
2603 static void svm_check_processor_compat(void *rtn)
2604 {
2605         *(int *)rtn = 0;
2606 }
2607
2608 static bool svm_cpu_has_accelerated_tpr(void)
2609 {
2610         return false;
2611 }
2612
2613 static int get_npt_level(void)
2614 {
2615 #ifdef CONFIG_X86_64
2616         return PT64_ROOT_LEVEL;
2617 #else
2618         return PT32E_ROOT_LEVEL;
2619 #endif
2620 }
2621
2622 static int svm_get_mt_mask_shift(void)
2623 {
2624         return 0;
2625 }
2626
2627 static struct kvm_x86_ops svm_x86_ops = {
2628         .cpu_has_kvm_support = has_svm,
2629         .disabled_by_bios = is_disabled,
2630         .hardware_setup = svm_hardware_setup,
2631         .hardware_unsetup = svm_hardware_unsetup,
2632         .check_processor_compatibility = svm_check_processor_compat,
2633         .hardware_enable = svm_hardware_enable,
2634         .hardware_disable = svm_hardware_disable,
2635         .cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
2636
2637         .vcpu_create = svm_create_vcpu,
2638         .vcpu_free = svm_free_vcpu,
2639         .vcpu_reset = svm_vcpu_reset,
2640
2641         .prepare_guest_switch = svm_prepare_guest_switch,
2642         .vcpu_load = svm_vcpu_load,
2643         .vcpu_put = svm_vcpu_put,
2644
2645         .set_guest_debug = svm_guest_debug,
2646         .get_msr = svm_get_msr,
2647         .set_msr = svm_set_msr,
2648         .get_segment_base = svm_get_segment_base,
2649         .get_segment = svm_get_segment,
2650         .set_segment = svm_set_segment,
2651         .get_cpl = svm_get_cpl,
2652         .get_cs_db_l_bits = kvm_get_cs_db_l_bits,
2653         .decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
2654         .set_cr0 = svm_set_cr0,
2655         .set_cr3 = svm_set_cr3,
2656         .set_cr4 = svm_set_cr4,
2657         .set_efer = svm_set_efer,
2658         .get_idt = svm_get_idt,
2659         .set_idt = svm_set_idt,
2660         .get_gdt = svm_get_gdt,
2661         .set_gdt = svm_set_gdt,
2662         .get_dr = svm_get_dr,
2663         .set_dr = svm_set_dr,
2664         .get_rflags = svm_get_rflags,
2665         .set_rflags = svm_set_rflags,
2666
2667         .tlb_flush = svm_flush_tlb,
2668
2669         .run = svm_vcpu_run,
2670         .handle_exit = handle_exit,
2671         .skip_emulated_instruction = skip_emulated_instruction,
2672         .patch_hypercall = svm_patch_hypercall,
2673         .get_irq = svm_get_irq,
2674         .set_irq = svm_set_irq,
2675         .queue_exception = svm_queue_exception,
2676         .exception_injected = svm_exception_injected,
2677         .inject_pending_irq = svm_intr_assist,
2678         .inject_pending_vectors = do_interrupt_requests,
2679
2680         .set_tss_addr = svm_set_tss_addr,
2681         .get_tdp_level = get_npt_level,
2682         .get_mt_mask_shift = svm_get_mt_mask_shift,
2683 };
2684
2685 static int __init svm_init(void)
2686 {
2687         return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
2688                               THIS_MODULE);
2689 }
2690
2691 static void __exit svm_exit(void)
2692 {
2693         kvm_exit();
2694 }
2695
2696 module_init(svm_init)
2697 module_exit(svm_exit)