linux-kernel - Re: [PATCH] KVM: selftests: Always run vCPU thread with blocked SIG

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Message-ID: <20210420143739.GA4440@xz-x1>
Date:   Tue, 20 Apr 2021 10:37:39 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Always run vCPU thread with blocked
 SIG_IPI

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@...hat.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Yes, indeed better! :)

Reviewed-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu