This is a note to let you know that I've just added the patch titled
x86: KVM: SVM: refresh AVIC inhibition in svm_leave_nested()
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-kvm-svm-refresh-avic-inhibition-in-svm_leave_nested.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3fdc6087df3be73a212a81ce5dd6516638568806 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Date: Thu, 28 Sep 2023 20:33:53 +0300
Subject: x86: KVM: SVM: refresh AVIC inhibition in svm_leave_nested()
From: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
commit 3fdc6087df3be73a212a81ce5dd6516638568806 upstream.
svm_leave_nested() similar to a nested VM exit, get the vCPU out of nested
mode and thus should end the local inhibition of AVIC on this vCPU.
Failure to do so, can lead to hangs on guest reboot.
Raise the KVM_REQ_APICV_UPDATE request to refresh the AVIC state of the
current vCPU in this case.
Fixes: f44509f849fe ("KVM: x86: SVM: allow AVIC to co-exist with a nested guest running")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Message-Id: <20230928173354.217464-4-mlevitsk@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm/nested.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -1243,6 +1243,9 @@ void svm_leave_nested(struct kvm_vcpu *v
nested_svm_uninit_mmu_context(vcpu);
vmcb_mark_all_dirty(svm->vmcb);
+
+ if (kvm_apicv_activated(vcpu->kvm))
+ kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu);
}
kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
Patches currently in stable-queue which might be from mlevitsk@xxxxxxxxxx are
queue-6.5/x86-kvm-svm-add-support-for-invalid-ipi-vector-interception.patch
queue-6.5/x86-kvm-svm-refresh-avic-inhibition-in-svm_leave_nested.patch
queue-6.5/x86-kvm-svm-always-update-the-x2avic-msr-interception.patch
