---

yaml --- r: 93788 b: refs/heads/master c: 1855267 h: refs/heads/master v: v3
git-mirror · Apr 27, 2008 · 2ca1ed4 · 2ca1ed4
1 parent bd058db
commit 2ca1ed4
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Showing 4 changed files with 21 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6c7dac72d5c7dc0e09512dce865398167be9a8f7
+refs/heads/master: 1855267210e1a8c9d41fe3a3c7a0d42eca5fb7cd
diff --git a/trunk/arch/x86/kvm/mmu.c b/trunk/arch/x86/kvm/mmu.c
@@ -32,6 +32,15 @@
 #include <asm/cmpxchg.h>
 #include <asm/io.h>
 
+/*
+ * When setting this variable to true it enables Two-Dimensional-Paging
+ * where the hardware walks 2 page tables:
+ * 1. the guest-virtual to guest-physical
+ * 2. while doing 1. it walks guest-physical to host-physical
+ * If the hardware supports that we don't need to do shadow paging.
+ */
+static bool tdp_enabled = false;
+
 #undef MMU_DEBUG
 
 #undef AUDIT
@@ -1582,6 +1591,12 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
 }
 EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
 
+void kvm_enable_tdp(void)
+{
+	tdp_enabled = true;
+}
+EXPORT_SYMBOL_GPL(kvm_enable_tdp);
+
 static void free_mmu_pages(struct kvm_vcpu *vcpu)
 {
 	struct kvm_mmu_page *sp;

diff --git a/trunk/arch/x86/kvm/svm.c b/trunk/arch/x86/kvm/svm.c
@@ -426,8 +426,10 @@ static __init int svm_hardware_setup(void)
 		npt_enabled = false;
 	}
 
-	if (npt_enabled)
+	if (npt_enabled) {
 		printk(KERN_INFO "kvm: Nested Paging enabled\n");
+		kvm_enable_tdp();
+	}
 
 	return 0;
 

diff --git a/trunk/include/asm-x86/kvm_host.h b/trunk/include/asm-x86/kvm_host.h
@@ -493,6 +493,8 @@ int kvm_fix_hypercall(struct kvm_vcpu *vcpu);
 
 int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code);
 
+void kvm_enable_tdp(void);
+
 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
 int complete_pio(struct kvm_vcpu *vcpu);