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From: Peter Xu <peterx@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Pei Zhang <pezhang@redhat.com>
Subject: Re: [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device
Date: Tue, 11 May 2021 10:39:11 -0400	[thread overview]
Message-ID: <YJqXD5gQCfzO4rT5@t490s> (raw)
In-Reply-To: <20210507220831.GA449495@fuller.cnet>

On Fri, May 07, 2021 at 07:08:31PM -0300, Marcelo Tosatti wrote:
> > Wondering whether we should add a pi_test_on() check in kvm_vcpu_has_events()
> > somehow, so that even without customized ->vcpu_check_block we should be able
> > to break the block loop (as kvm_arch_vcpu_runnable will return true properly)?
> 
> static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
> {
>         int ret = -EINTR;
>         int idx = srcu_read_lock(&vcpu->kvm->srcu);
> 
>         if (kvm_arch_vcpu_runnable(vcpu)) {
>                 kvm_make_request(KVM_REQ_UNHALT, vcpu); <---
>                 goto out;
>         }
> 
> Don't want to unhalt the vcpu.

Could you elaborate?  It's not obvious to me why we can't do that if
pi_test_on() returns true..  we have pending post interrupts anyways, so
shouldn't we stop halting?  Thanks!

-- 
Peter Xu


  reply	other threads:[~2021-05-11 14:39 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-07 13:06 [patch 0/4] VMX: configure posted interrupt " Marcelo Tosatti
2021-05-07 13:06 ` [patch 1/4] KVM: x86: add start_assignment hook to kvm_x86_ops Marcelo Tosatti
2021-05-07 19:16   ` Peter Xu
2021-05-10 17:53     ` Marcelo Tosatti
2021-05-07 13:06 ` [patch 2/4] KVM: add arch specific vcpu_check_block callback Marcelo Tosatti
2021-05-07 13:06 ` [patch 3/4] KVM: x86: implement kvm_arch_vcpu_check_block callback Marcelo Tosatti
2021-05-07 13:06 ` [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Marcelo Tosatti
2021-05-07 17:22   ` Sean Christopherson
2021-05-07 19:29     ` Peter Xu
2021-05-07 22:08       ` Marcelo Tosatti
2021-05-11 14:39         ` Peter Xu [this message]
2021-05-11 14:51           ` Marcelo Tosatti
2021-05-11 16:19             ` Peter Xu
2021-05-11 17:18               ` Marcelo Tosatti
2021-05-11 21:35                 ` Peter Xu
2021-05-11 23:51                   ` Marcelo Tosatti
2021-05-12  0:02                     ` Marcelo Tosatti
2021-05-12  0:38                       ` Peter Xu
2021-05-12 11:10                         ` Marcelo Tosatti
2021-05-12 14:41                       ` Sean Christopherson
2021-05-12 15:34                         ` Peter Xu
2021-05-10 17:26 [patch 0/4] VMX: configure posted interrupt descriptor when assigning device (v3) Marcelo Tosatti
2021-05-10 17:26 ` [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Marcelo Tosatti
2021-05-24 15:55   ` Paolo Bonzini
2021-05-24 17:53     ` Marcelo Tosatti
2021-05-25 11:58       ` Paolo Bonzini
2021-05-11 23:57 [patch 0/4] VMX: configure posted interrupt descriptor when assigning device (v4) Marcelo Tosatti
2021-05-11 23:57 ` [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Marcelo Tosatti

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