From: Sean Christopherson <seanjc@google.com>
To: Maxim Levitsky <mlevitsk@redhat.com>
Cc: kvm@vger.kernel.org, iommu@lists.linux.dev,
"H. Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>, Joerg Roedel <joro@8bytes.org>,
x86@kernel.org,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
linux-kernel@vger.kernel.org,
Dave Hansen <dave.hansen@linux.intel.com>,
Will Deacon <will@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Robin Murphy <robin.murphy@arm.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v2 3/4] x86: KVM: SVM: refresh AVIC inhibition in svm_leave_nested()
Date: Thu, 28 Sep 2023 17:42:35 -0700 [thread overview]
Message-ID: <ZRYde2P413vWOYDq@google.com> (raw)
In-Reply-To: <20230928173354.217464-4-mlevitsk@redhat.com>
On Thu, Sep 28, 2023, Maxim Levitsky wrote:
> 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@vger.kernel.org
> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> ---
Reviewed-by: Sean Christopherson <seanjc@google.com>
next prev parent reply other threads:[~2023-09-29 0:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-28 17:33 [PATCH v2 0/4] AVIC bugfixes and workarounds Maxim Levitsky
2023-09-28 17:33 ` [PATCH v2 1/4] x86: KVM: SVM: always update the x2avic msr interception Maxim Levitsky
2023-09-29 0:24 ` Sean Christopherson
2023-10-03 3:17 ` Suthikulpanit, Suravee
2023-09-28 17:33 ` [PATCH v2 2/4] x86: KVM: SVM: add support for Invalid IPI Vector interception Maxim Levitsky
2023-09-29 0:42 ` Sean Christopherson
2023-09-28 17:33 ` [PATCH v2 3/4] x86: KVM: SVM: refresh AVIC inhibition in svm_leave_nested() Maxim Levitsky
2023-09-29 0:42 ` Sean Christopherson [this message]
2023-09-28 17:33 ` [PATCH v2 4/4] x86: KVM: SVM: workaround for AVIC's errata #1235 Maxim Levitsky
2023-09-29 2:06 ` Sean Christopherson
2023-09-29 2:09 ` [PATCH v2 0/4] AVIC bugfixes and workarounds Sean Christopherson
2023-09-29 17:42 ` Paolo Bonzini
2023-10-12 14:46 ` Paolo Bonzini
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