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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Anton Kuchin <antonkuchin@yandex-team.ru>
Cc: virtio-fs@redhat.com, "Michael S. Tsirkin" <mst@redhat.com>,
	qemu-devel@nongnu.org,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>
Subject: Re: [PATCH] vhost-user-fs: fix features handling
Date: Tue, 13 Apr 2021 09:47:14 +0100	[thread overview]
Message-ID: <YHVakoU5hY0wif2n@stefanha-x1.localdomain> (raw)
In-Reply-To: <20210408195534.647895-1-antonkuchin@yandex-team.ru>

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On Thu, Apr 08, 2021 at 10:55:34PM +0300, Anton Kuchin wrote:
> Make virtio-fs take into account server capabilities.
> 
> Just returning requested features assumes they all of then are implemented
> by server and results in setting unsupported configuration if some of them
> are absent.
> 
> Signed-off-by: Anton Kuchin <antonkuchin@yandex-team.ru>
> ---
>  hw/virtio/vhost-user-fs.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
> index ac4fc34b36..6cf983ba0e 100644
> --- a/hw/virtio/vhost-user-fs.c
> +++ b/hw/virtio/vhost-user-fs.c
> @@ -24,6 +24,14 @@
>  #include "monitor/monitor.h"
>  #include "sysemu/sysemu.h"
>  
> +static const int user_feature_bits[] = {
> +    VIRTIO_F_VERSION_1,
> +    VIRTIO_RING_F_INDIRECT_DESC,
> +    VIRTIO_RING_F_EVENT_IDX,
> +    VIRTIO_F_NOTIFY_ON_EMPTY,
> +    VHOST_INVALID_FEATURE_BIT
> +};

Please add:

VIRTIO_F_RING_PACKED
VIRTIO_F_IOMMU_PLATFORM

QEMU's virtiofsd does not enable either of these for now, but it's worth
allowing the vhost-user device backend to participate in negotiation so
that this can change in the future (or alternative virtiofsd
implementations can support these features).

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  parent reply	other threads:[~2021-04-13  8:48 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 19:55 Anton Kuchin
2021-04-09 15:56 ` [Virtio-fs] " Vivek Goyal
2021-04-11  6:21   ` Anton Kuchin
2021-04-12 18:43     ` Vivek Goyal
2021-04-13  8:53       ` Stefan Hajnoczi
2021-04-13  8:47 ` Stefan Hajnoczi [this message]
2021-04-13 11:36   ` Dr. David Alan Gilbert
2021-04-13 13:35   ` [Virtio-fs] " Vivek Goyal
2021-04-14  7:00     ` Stefan Hajnoczi

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