[PATCH 5.1 58/62] KVM: nVMX: Clear pending KVM_REQ_GET_VMCS12_PAGES when leaving nested

[Greg Kroah-Hartman]

From: Jan Kiszka <jan.kis...@siemens.com>

commit cf64527bb33f6cec2ed50f89182fc4688d0056b6 upstream.

Letting this pend may cause nested_get_vmcs12_pages to run against an
invalid state, corrupting the effective vmcs of L1.

This was triggerable in QEMU after a guest corruption in L2, followed by
a L1 reset.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
Reviewed-by: Liran Alon <liran.a...@oracle.com>
Cc: sta...@vger.kernel.org
Fixes: 7f7f1ba33cf2 ("KVM: x86: do not load vmcs12 pages while still in SMM")
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/x86/kvm/vmx/nested.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -212,6 +212,8 @@ static void free_nested(struct kvm_vcpu
        if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
                return;
 
+       kvm_clear_request(KVM_REQ_GET_VMCS12_PAGES, vcpu);
+
        vmx->nested.vmxon = false;
        vmx->nested.smm.vmxon = false;
        free_vpid(vmx->nested.vpid02);