[v5,11/13] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS
diff mbox series

Message ID 1547026933-31226-12-git-send-email-karahmed@amazon.de
State New
Headers show
Series
  • KVM/X86: Introduce a new guest mapping interface
Related show

Commit Message

KarimAllah Ahmed Jan. 9, 2019, 9:42 a.m. UTC
Use kvm_vcpu_map for accessing the shadow VMCS since using
kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
a "struct page".

Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
---
v4 -> v5:
- unmap with dirty flag
---
 arch/x86/kvm/vmx/nested.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

Comments

Konrad Rzeszutek Wilk Jan. 23, 2019, 6:10 p.m. UTC | #1
On Wed, Jan 09, 2019 at 10:42:11AM +0100, KarimAllah Ahmed wrote:
> Use kvm_vcpu_map for accessing the shadow VMCS since using
> kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
> a "struct page".
> 
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>

Reviewed-by: Konrad Rzessutek Wilk <konrad.wilk@oracle.com>

Patch
diff mbox series

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index b4230ce..04a8b43 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -588,20 +588,20 @@  static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 static void nested_cache_shadow_vmcs12(struct kvm_vcpu *vcpu,
 				       struct vmcs12 *vmcs12)
 {
+	struct kvm_host_map map;
 	struct vmcs12 *shadow;
-	struct page *page;
 
 	if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
 	    vmcs12->vmcs_link_pointer == -1ull)
 		return;
 
 	shadow = get_shadow_vmcs12(vcpu);
-	page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer);
 
-	memcpy(shadow, kmap(page), VMCS12_SIZE);
+	if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->vmcs_link_pointer), &map))
+		return;
 
-	kunmap(page);
-	kvm_release_page_clean(page);
+	memcpy(shadow, map.hva, VMCS12_SIZE);
+	kvm_vcpu_unmap(&map, false);
 }
 
 static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu,
@@ -2637,9 +2637,9 @@  static int nested_vmx_check_vmentry_prereqs(struct kvm_vcpu *vcpu,
 static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
 					  struct vmcs12 *vmcs12)
 {
-	int r;
-	struct page *page;
+	int r = 0;
 	struct vmcs12 *shadow;
+	struct kvm_host_map map;
 
 	if (vmcs12->vmcs_link_pointer == -1ull)
 		return 0;
@@ -2647,17 +2647,16 @@  static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
 	if (!page_address_valid(vcpu, vmcs12->vmcs_link_pointer))
 		return -EINVAL;
 
-	page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->vmcs_link_pointer);
-	if (is_error_page(page))
+	if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->vmcs_link_pointer), &map))
 		return -EINVAL;
 
-	r = 0;
-	shadow = kmap(page);
+	shadow = map.hva;
+
 	if (shadow->hdr.revision_id != VMCS12_REVISION ||
 	    shadow->hdr.shadow_vmcs != nested_cpu_has_shadow_vmcs(vmcs12))
 		r = -EINVAL;
-	kunmap(page);
-	kvm_release_page_clean(page);
+
+	kvm_vcpu_unmap(&map, false);
 	return r;
 }