From: Roman Kagan <rkagan@virtuozzo.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<dvyukov@google.com>
Subject: Re: [PATCH v2] KVM: hyperv: fix locking of struct kvm_hv fields
Date: Mon, 12 Dec 2016 14:27:47 +0300 [thread overview]
Message-ID: <20161212112747.GA2087@rkaganb.sw.ru> (raw)
In-Reply-To: <20161212091253.19780-1-pbonzini@redhat.com>
On Mon, Dec 12, 2016 at 10:12:53AM +0100, Paolo Bonzini wrote:
> Introduce a new mutex to avoid an AB-BA deadlock between kvm->lock and
> vcpu->mutex. Protect accesses in kvm_hv_setup_tsc_page too, as suggested
> by Roman.
>
> Reported-by: Dmitry Vyukov <dvyukov@google.com>
> Cc: Roman Kagan <rkagan@virtuozzo.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> Documentation/virtual/kvm/locking.txt | 8 ++++++--
> arch/x86/include/asm/kvm_host.h | 1 +
> arch/x86/kvm/hyperv.c | 24 +++++++++++++++---------
> arch/x86/kvm/x86.c | 1 +
> 4 files changed, 23 insertions(+), 11 deletions(-)
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
prev parent reply other threads:[~2016-12-12 12:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-12 9:12 Paolo Bonzini
2016-12-12 11:27 ` Roman Kagan [this message]
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