Re: [PATCH v2 02/43] KVM: SVM: Ensure target pCPU is read once when signalling AVIC doorbell

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Subject: Re: [PATCH v2 02/43] KVM: SVM: Ensure target pCPU is read once when signalling AVIC doorbell
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Mon, 25 Oct 2021 15:21:59 +0200
Cc: James Morse <james.morse@xxxxxxx>, Alexandru Elisei <alexandru.elisei@xxxxxxx>, Suzuki K Poulose <suzuki.poulose@xxxxxxx>, Atish Patra <atish.patra@xxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, kvm-ppc@xxxxxxxxxxxxxxx, kvm-riscv@xxxxxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, David Matlack <dmatlack@xxxxxxxxxx>, Oliver Upton <oupton@xxxxxxxxxx>, Jing Zhang <jingzhangos@xxxxxxxxxx>
In-reply-to: <20211009021236.4122790-3-seanjc@google.com>
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On 09/10/21 04:11, Sean Christopherson wrote:

+		 * point, which could result in signalling the wrong/previous
+		 * pCPU.  But if that happens the vCPU is guaranteed to do a
+		 * VMRUN (after being migrated) and thus will process pending
+		 * interrupts, i.e. a doorbell is not needed (and the spurious)


... one is harmless, I suppose.

Paolo

References:
- [PATCH v2 00/43] KVM: Halt-polling and x86 APICv overhaul
  - From: Sean Christopherson
- [PATCH v2 02/43] KVM: SVM: Ensure target pCPU is read once when signalling AVIC doorbell
  - From: Sean Christopherson

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