linux-kernel - Re: [PATCH V3 01/10] vhost: disable metadata prefetch optimization

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Message-ID: <a084127d-4acb-dceb-3bb6-617eb79734e4@redhat.com>
Date:   Wed, 7 Aug 2019 15:05:49 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, jgg@...pe.ca
Subject: Re: [PATCH V3 01/10] vhost: disable metadata prefetch optimization


On 2019/8/7 下午2:54, Jason Wang wrote:
> From: "Michael S. Tsirkin" <mst@...hat.com>
>
> 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 <mst@...hat.com>
> ---
>   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