From: Peter Xu <peterx@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] KVM: selftests: Always run vCPU thread with blocked SIG_IPI
Date: Tue, 20 Apr 2021 12:58:34 -0400 [thread overview]
Message-ID: <20210420165834.GC4440@xz-x1> (raw)
In-Reply-To: <84c52ebe-58a2-6188-270e-c86409e44fa3@redhat.com>
On Tue, Apr 20, 2021 at 06:24:50PM +0200, Paolo Bonzini wrote:
> On 20/04/21 17:32, Peter Xu wrote:
> > On Tue, Apr 20, 2021 at 10:37:39AM -0400, Peter Xu wrote:
> > > On Tue, Apr 20, 2021 at 04:16:14AM -0400, Paolo Bonzini wrote:
> > > > The main thread could start to send SIG_IPI at any time, even before signal
> > > > blocked on vcpu thread. Therefore, start the vcpu thread with the signal
> > > > blocked.
> > > >
> > > > Without this patch, on very busy cores the dirty_log_test could fail directly
> > > > on receiving a SIGUSR1 without a handler (when vcpu runs far slower than main).
> > > >
> > > > Reported-by: Peter Xu <peterx@redhat.com>
> > > > Cc: stable@vger.kernel.org
> > > > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> > >
> > > Yes, indeed better! :)
> > >
> > > Reviewed-by: Peter Xu <peterx@redhat.com>
> >
> > I just remembered one thing: this will avoid program quits, but still we'll get
> > the signal missing.
>
> In what sense the signal will be missing? As long as the thread exists, the
> signal will be accepted (but not delivered because it is blocked); it will
> then be delivered on the first KVM_RUN.
Ah right.. Thanks,
--
Peter Xu
prev parent reply other threads:[~2021-04-20 16:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 8:16 [PATCH] KVM: selftests: Always run vCPU thread with blocked SIG_IPI Paolo Bonzini
2021-04-20 14:37 ` Peter Xu
2021-04-20 15:32 ` Peter Xu
2021-04-20 16:24 ` Paolo Bonzini
2021-04-20 16:58 ` Peter Xu [this message]
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