[PATCH 5.2 47/85] KVM: nVMX: handle page fault in vmread

Greg Kroah-Hartman
2019-09-18T06:27:54Z

From: Paolo Bonzini <pbonzini@redhat.com>

commit f7eea636c3d505fe6f1d1066234f1aaf7171b681 upstream.

The implementation of vmread to memory is still incomplete, as it
lacks the ability to do vmread to I/O memory just like vmptrst.

Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/x86/kvm/vmx/nested.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4411,6 +4411,7 @@ static int handle_vmread(struct kvm_vcpu
int len;
gva_t gva = 0;
struct vmcs12 *vmcs12;
+ struct x86_exception e;

if (!nested_vmx_check_permission(vcpu))
return 1;
@@ -4451,7 +4452,8 @@ static int handle_vmread(struct kvm_vcpu
vmx_instruction_info, true, len, &gva))
return 1;
/* _system ok, nested_vmx_check_permission has verified cpl=0 */
- kvm_write_guest_virt_system(vcpu, gva, &field_value, len, NULL);
+ if (kvm_write_guest_virt_system(vcpu, gva, &field_value, len, &e))
+ kvm_inject_page_fault(vcpu, &e);
}

return nested_vmx_succeed(vcpu);