From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Tue, 23 Sep 2008 16:18:41 +0000 (-0300)
Subject: KVM: MMU: add "oos_shadow" parameter to disable oos
X-Git-Tag: v2.6.28-rc1~269^2~12
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=582801a95d2f2ceab841779e1dec0e11dfec44c0;p=linux-2.6-omap-h63xx.git

KVM: MMU: add "oos_shadow" parameter to disable oos

Subject says it all.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index cb391d629af..99c239c5c0a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -70,6 +70,9 @@ static int dbg = 0;
 module_param(dbg, bool, 0644);
 #endif
 
+static int oos_shadow = 1;
+module_param(oos_shadow, bool, 0644);
+
 #ifndef MMU_DEBUG
 #define ASSERT(x) do { } while (0)
 #else
@@ -1424,7 +1427,7 @@ static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
 			return 1;
 		if (shadow->unsync)
 			return 0;
-		if (can_unsync)
+		if (can_unsync && oos_shadow)
 			return kvm_unsync_page(vcpu, shadow);
 		return 1;
 	}