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From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Gaoning Pan <pgn@zju.edu.cn>, Yongkang Jia <kangel@zju.edu.cn>,
	Maxim Levitsky <mlevitsk@redhat.com>
Subject: [PATCH 0/4] KVM: x86: APICv fixes
Date: Sat, 16 Apr 2022 03:42:45 +0000	[thread overview]
Message-ID: <20220416034249.2609491-1-seanjc@google.com> (raw)

Patch 1 is brown paper bag fix for a copy+paste bug (thankfully from this
cycle).

Patch 2 fixes a nVMX + APICv bug where KVM essentially corrupts vmcs02 if
an APICv update arrives while L2 is running.  Found when testing a slight
variation of patch 3.

Patch 3 fixes a race where an APICv update that occurs while a vCPU is
being created will fail to notify that vCPU due it not yet being visible
to the updater.

Patch 4 is a minor optimization/cleanup found by inspection when digging
into everything else.

Sean Christopherson (4):
  KVM: x86: Tag APICv DISABLE inhibit, not ABSENT, if APICv is disabled
  KVM: nVMX: Defer APICv updates while L2 is active until L1 is active
  KVM: x86: Pend KVM_REQ_APICV_UPDATE during vCPU creation to fix a race
  KVM: x86: Skip KVM_GUESTDBG_BLOCKIRQ APICv update if APICv is disabled

 arch/x86/kvm/vmx/nested.c |  5 +++++
 arch/x86/kvm/vmx/vmx.c    |  5 +++++
 arch/x86/kvm/vmx/vmx.h    |  1 +
 arch/x86/kvm/x86.c        | 20 ++++++++++++++++++--
 4 files changed, 29 insertions(+), 2 deletions(-)


base-commit: 150866cd0ec871c765181d145aa0912628289c8a
-- 
2.36.0.rc0.470.gd361397f0d-goog


             reply	other threads:[~2022-04-16  3:43 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-16  3:42 Sean Christopherson [this message]
2022-04-16  3:42 ` [PATCH 1/4] KVM: x86: Tag APICv DISABLE inhibit, not ABSENT, if APICv is disabled Sean Christopherson
2022-04-18  8:37   ` Maxim Levitsky
2022-04-16  3:42 ` [PATCH 2/4] KVM: nVMX: Defer APICv updates while L2 is active until L1 is active Sean Christopherson
2022-04-18 12:49   ` Maxim Levitsky
2022-04-18 15:35     ` Sean Christopherson
2022-04-19  6:44       ` Maxim Levitsky
2022-04-19 15:57         ` Sean Christopherson
2022-04-16  3:42 ` [PATCH 3/4] KVM: x86: Pend KVM_REQ_APICV_UPDATE during vCPU creation to fix a race Sean Christopherson
2022-04-18 12:49   ` Maxim Levitsky
2022-04-16  3:42 ` [PATCH 4/4] KVM: x86: Skip KVM_GUESTDBG_BLOCKIRQ APICv update if APICv is disabled Sean Christopherson
2022-04-18 12:50   ` Maxim Levitsky

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