linux-kernel - [PATCH v2 3/4] KVM: nSVM: always leave the nested state first on KVM_SET_NESTED

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Message-Id: <20210107093854.882483-4-mlevitsk@redhat.com>
Date:   Thu,  7 Jan 2021 11:38:53 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        Ingo Molnar <mingo@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        Jim Mattson <jmattson@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v2 3/4] KVM: nSVM: always leave the nested state first on KVM_SET_NESTED_STATE

This should prevent bad things from happening if the user calls the
KVM_SET_NESTED_STATE twice.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/nested.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index cc3130ab612e5..e91d40c8d8c91 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1200,6 +1200,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 	 * in the registers, the save area of the nested state instead
 	 * contains saved L1 state.
 	 */
+	svm_leave_nested(svm);
 
 	svm->nested.nested_run_pending =
 		!!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
-- 
2.26.2