[15/27] KVM: MMU: Introduce kvm_read_guest_page_x86()

Commit Message

Joerg Roedel Sept. 6, 2010, 3:55 p.m. UTC

None

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f1bdf4e..1f5db75 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -392,6 +392,13 @@  int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 }
 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 
+int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
+			       void *data, int offset, int len, u32 *error)
+{
+	return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
+				       data, offset, len, error);
+}
+
 /*
  * Load the pae pdptrs.  Return true is they are all valid.
  */
@@ -399,12 +406,13 @@  int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 {
 	gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 	unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
-	int i;
+	int i, error;
 	int ret;
 	u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 
-	ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
-				  offset * sizeof(u64), sizeof(pdpte));
+	ret = kvm_read_nested_guest_page(vcpu, pdpt_gfn, pdpte,
+					 offset * sizeof(u64),
+					 sizeof(pdpte), &error);
 	if (ret < 0) {
 		ret = 0;
 		goto out;
@@ -433,6 +441,9 @@  static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 {
 	u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 	bool changed = true;
+	int offset;
+	u32 error;
+	gfn_t gfn;
 	int r;
 
 	if (is_long_mode(vcpu) || !is_pae(vcpu))
@@ -442,7 +453,10 @@  static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 		      (unsigned long *)&vcpu->arch.regs_avail))
 		return true;
 
-	r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
+	gfn = (vcpu->arch.cr3 & ~31u) >> PAGE_SHIFT;
+	offset = (vcpu->arch.cr3 & ~31u) & (PAGE_SIZE - 1);
+	r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset,
+				       sizeof(pdpte), &error);
 	if (r < 0)
 		goto out;
 	changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;