lkml.org 
[lkml]   [2018]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 13/14] 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>
---
arch/x86/kvm/vmx.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 390a971..a958700 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -12138,20 +12138,20 @@ 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);
}

static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu,
@@ -13133,9 +13133,9 @@ static int check_vmentry_prereqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
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;
@@ -13143,17 +13143,16 @@ 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);
return r;
}

--
2.7.4
\
 
 \ /
  Last update: 2018-12-03 10:32    [W:0.130 / U:12.576 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site