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From: Maxim Levitsky <mlevitsk@redhat.com>
To: kvm@vger.kernel.org
Cc: Wanpeng Li <wanpengli@tencent.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT
	AND 64-BIT)), Jim Mattson <jmattson@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
	Joerg Roedel <joro@8bytes.org>, Ingo Molnar <mingo@redhat.com>,
	x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	Sean Christopherson <seanjc@google.com>,
	Cathy Avery <cavery@redhat.com>,
	Maxim Levitsky <mlevitsk@redhat.com>
Subject: [PATCH 5/5] KVM: nSVM: set a dummy exit reason in L1 vmcb when loading the nested state
Date: Mon,  3 May 2021 15:54:46 +0300	[thread overview]
Message-ID: <20210503125446.1353307-6-mlevitsk@redhat.com> (raw)
In-Reply-To: <20210503125446.1353307-1-mlevitsk@redhat.com>

Since the nested migration is a result of a VMRUN, this makes it
possible to keep a warning that L1 vmcb should always have
VMRUN exit reason when switching back to it, which
otherwise triggers incorrectly.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
 arch/x86/kvm/svm/nested.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 12a12ae940fa..146be4b5084b 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1338,6 +1338,12 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 	svm->vmcb01.ptr->save.rip = save->rip;
 	svm->vmcb01.ptr->save.cpl = 0;
+	/*
+	 * For consistency sake, restore the L1 exit reason
+	 * (that happened prior to the migration) to SVM_EXIT_VMRUN.
+	 */
+	svm->vmcb->control.exit_code = SVM_EXIT_VMRUN;
 	nested_load_control_from_vmcb12(svm, ctl);
 	svm_switch_vmcb(svm, &svm->nested.vmcb02);

  parent reply	other threads:[~2021-05-03 12:55 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-03 12:54 [PATCH 0/5] KVM: nSVM: few fixes for the nested migration Maxim Levitsky
2021-05-03 12:54 ` [PATCH 1/5] KVM: nSVM: fix a typo in svm_leave_nested Maxim Levitsky
2021-05-03 12:54 ` [PATCH 2/5] KVM: nSVM: fix few bugs in the vmcb02 caching logic Maxim Levitsky
2021-05-03 12:54 ` [PATCH 3/5] KVM: nSVM: leave the guest mode prior to loading a nested state Maxim Levitsky
2021-05-03 12:54 ` [PATCH 4/5] KVM: nSVM: force L1's GIF to 1 when setting the " Maxim Levitsky
2021-05-03 14:00   ` Paolo Bonzini
2021-05-03 14:24     ` Maxim Levitsky
2021-05-03 12:54 ` Maxim Levitsky [this message]
2021-05-03 14:02   ` [PATCH 5/5] KVM: nSVM: set a dummy exit reason in L1 vmcb when loading " Paolo Bonzini
2021-05-03 14:26     ` Maxim Levitsky
2021-05-03 14:03 ` [PATCH 0/5] KVM: nSVM: few fixes for the nested migration Paolo Bonzini

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