linux-kernel - [PATCH v2 2/7] KVM: nVMX: Reload vmcs01 if getting vmcs12's pages fails

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Date:   Wed, 23 Sep 2020 11:44:47 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dan Cross <dcross@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: [PATCH v2 2/7] KVM: nVMX: Reload vmcs01 if getting vmcs12's pages fails

Reload vmcs01 when bailing from nested_vmx_enter_non_root_mode() as KVM
expects vmcs01 to be loaded when is_guest_mode() is false.

Fixes: 671ddc700fd08 ("KVM: nVMX: Don't leak L1 MMIO regions to L2")
Cc: stable@...r.kernel.org
Cc: Dan Cross <dcross@...gle.com>
Cc: Jim Mattson <jmattson@...gle.com>
Cc: Peter Shier <pshier@...gle.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/nested.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 04441663a631..171e34286908 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3346,8 +3346,10 @@ enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
 	prepare_vmcs02_early(vmx, vmcs12);
 
 	if (from_vmentry) {
-		if (unlikely(!nested_get_vmcs12_pages(vcpu)))
+		if (unlikely(!nested_get_vmcs12_pages(vcpu))) {
+			vmx_switch_vmcs(vcpu, &vmx->vmcs01);
 			return NVMX_VMENTRY_KVM_INTERNAL_ERROR;
+		}
 
 		if (nested_vmx_check_vmentry_hw(vcpu)) {
 			vmx_switch_vmcs(vcpu, &vmx->vmcs01);
-- 
2.28.0