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From: Wanpeng Li <>
To: Joao Martins <>
Cc: kvm <>, LKML <>,
	"Paolo Bonzini" <>,
	"Radim Krčmář" <>,
	"Sean Christopherson" <>,
	"Vitaly Kuznetsov" <>,
	"Wanpeng Li" <>,
	"Jim Mattson" <>,
	"Joerg Roedel" <>,
	"Liran Alon" <>,
	"Jag Raman" <>
Subject: Re: [PATCH v2 2/3] KVM: VMX: Do not change PID.NDST when loading a blocked vCPU
Date: Tue, 19 Nov 2019 19:36:19 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 12 Nov 2019 at 01:23, Joao Martins <> wrote:
> While vCPU is blocked (in kvm_vcpu_block()), it may be preempted which
> will cause vmx_vcpu_pi_put() to set PID.SN.  If later the vCPU will be

How can this happen? See the prepare_to_swait_exlusive() in
kvm_vcpu_block(), the task will be set in TASK_INTERRUPTIBLE state,
kvm_sched_out will set vcpu->preempted to true iff current->state ==


  reply	other threads:[~2019-11-19 11:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-11 17:20 [PATCH v2 0/3] KVM: VMX: Posted Interrupts fixes Joao Martins
2019-11-11 17:20 ` [PATCH v2 1/3] KVM: VMX: Consider PID.PIR to determine if vCPU has pending interrupts Joao Martins
2019-11-11 17:20 ` [PATCH v2 2/3] KVM: VMX: Do not change PID.NDST when loading a blocked vCPU Joao Martins
2019-11-19 11:36   ` Wanpeng Li [this message]
2019-11-19 14:44     ` Joao Martins
2019-11-11 17:20 ` [PATCH v2 3/3] KVM: VMX: Introduce pi_is_pir_empty() helper Joao Martins

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