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X86/nVMX: Update the PML table without mapping and unmapping the page

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Update the PML table without mapping and unmapping the page. This also
avoids using kvm_vcpu_gpa_to_page(..) which assumes that there is a "struct
page" for guest memory.

As a side-effect of using kvm_write_guest_page the page is also properly
marked as dirty.

Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
KarimAllah Ahmed 2019-01-31 21:24:32 +01:00 committed by Paolo Bonzini
parent 2e408936b6
commit 3d5f6beb74
1 changed files with 5 additions and 9 deletions
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14
arch/x86/kvm/vmx/vmx.c
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@ -7116,9 +7116,7 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
gpa_t gpa;
struct page *page = NULL;
u64 *pml_address;
gpa_t gpa, dst;
if (is_guest_mode(vcpu)) {
WARN_ON_ONCE(vmx->nested.pml_full);
@ -7138,15 +7136,13 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu)
}
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS) & ~0xFFFull;
dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index;
page = kvm_vcpu_gpa_to_page(vcpu, vmcs12->pml_address);
if (is_error_page(page))
if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa,
offset_in_page(dst), sizeof(gpa)))
return 0;
pml_address = kmap(page);
pml_address[vmcs12->guest_pml_index--] = gpa;
kunmap(page);
kvm_release_page_clean(page);
vmcs12->guest_pml_index--;
}
return 0;