KVM: Reduce stack usage in kvm_pv_mmu_op()

[linux-2.6-omap-h63xx.git] / include / asm-x86 / kvm_host.h

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 99dddfcecf6082413c04beb818cfee4836ec1780..9cb4b4dae5c69d36ec5009e9471f0e37315cc4f9 100644 (file)
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -201,6 +201,13 @@ struct kvm_mmu_page {
        };
 };
 
+struct kvm_pv_mmu_op_buffer {
+       void *ptr;
+       unsigned len;
+       unsigned processed;
+       char buf[512] __aligned(sizeof(long));
+};
+
 /*
  * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
  * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
@@ -248,6 +255,9 @@ struct kvm_vcpu_arch {
        bool tpr_access_reporting;
 
        struct kvm_mmu mmu;
+       /* only needed in kvm_pv_mmu_op() path, but it's hot so
+        * put it here to avoid allocation */
+       struct kvm_pv_mmu_op_buffer mmu_op_buffer;
 
        struct kvm_mmu_memory_cache mmu_pte_chain_cache;
        struct kvm_mmu_memory_cache mmu_rmap_desc_cache;