From 3d5f6beb74a00bcc308612ee007e3e0c6126c397 Mon Sep 17 00:00:00 2001
From: KarimAllah Ahmed <karahmed@amazon.de>
Date: Thu, 31 Jan 2019 21:24:32 +0100
Subject: [PATCH] X86/nVMX: Update the PML table without mapping and unmapping
the page
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>
---
arch/x86/kvm/vmx/vmx.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 835f642e70e21..afe45a28020ca 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -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;
--
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