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[209.132.183.28]) by mx.google.com with ESMTPS id h7si46734qkl.267.2019.08.07.00.05.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 07 Aug 2019 00:05:56 -0700 (PDT) Received-SPF: pass (google.com: domain of jasowang@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of jasowang@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=jasowang@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7D78E81F25; Wed, 7 Aug 2019 07:05:55 +0000 (UTC) Received: from [10.72.12.139] (ovpn-12-139.pek2.redhat.com [10.72.12.139]) by smtp.corp.redhat.com (Postfix) with ESMTP id E3D841000324; Wed, 7 Aug 2019 07:05:50 +0000 (UTC) Subject: Re: [PATCH V3 01/10] vhost: disable metadata prefetch optimization From: Jason Wang To: mst@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, jgg@ziepe.ca References: <20190807065449.23373-1-jasowang@redhat.com> <20190807065449.23373-2-jasowang@redhat.com> Message-ID: Date: Wed, 7 Aug 2019 15:05:49 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190807065449.23373-2-jasowang@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 07 Aug 2019 07:05:55 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2019/8/7 下午2:54, Jason Wang wrote: > From: "Michael S. Tsirkin" > > This seems to cause guest and host memory corruption. > Disable for now until we get a better handle on that. > > Signed-off-by: Michael S. Tsirkin > --- > drivers/vhost/vhost.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h > index 819296332913..42a8c2a13ab1 100644 > --- a/drivers/vhost/vhost.h > +++ b/drivers/vhost/vhost.h > @@ -96,7 +96,7 @@ struct vhost_uaddr { > }; > > #if defined(CONFIG_MMU_NOTIFIER) && ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 0 > -#define VHOST_ARCH_CAN_ACCEL_UACCESS 1 > +#define VHOST_ARCH_CAN_ACCEL_UACCESS 0 > #else > #define VHOST_ARCH_CAN_ACCEL_UACCESS 0 > #endif Oops, this is unnecessary. Will post V4. Thanks