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Subject[PATCH v6 11/14] KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS
Date
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>
---
v4 -> v5:
- unmap with dirty flag
---
arch/x86/kvm/vmx/nested.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 53b1063..3c173b9 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(vcpu, &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(vcpu, &map, false);
return r;
}

--
2.7.4
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