linux-kernel - Re: [PATCH 11/11] tools headers: Sync uapi/linux/vhost.h with the kernel source

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Message-ID: <20250826033710-mutt-send-email-mst@kernel.org>
Date: Tue, 26 Aug 2025 03:38:44 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org, Jason Wang <jasowang@...hat.com>,
	kvm@...r.kernel.org, virtualization@...ts.linux.dev
Subject: Re: [PATCH 11/11] tools headers: Sync uapi/linux/vhost.h with the
 kernel source

On Mon, Aug 25, 2025 at 02:59:03PM -0700, Namhyung Kim wrote:
> To pick up the changes in this cset:
> 
>   7d9896e9f6d02d8a vhost: Reintroduce kthread API and add mode selection
>   333c515d189657c9 vhost-net: allow configuring extended features
> 
> This addresses these perf build warnings:
> 
>   Warning: Kernel ABI header differences:
>     diff -u tools/perf/trace/beauty/include/uapi/linux/vhost.h include/uapi/linux/vhost.h
> 
> Please see tools/include/uapi/README for further details.
> 
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: kvm@...r.kernel.org
> Cc: virtualization@...ts.linux.dev
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

Should I queue it?

> ---
> * This is on top of the fix below:
>   https://lore.kernel.org/r/20250819063958.833770-1-namhyung@kernel.org
> 
>  .../trace/beauty/include/uapi/linux/vhost.h   | 35 +++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/tools/perf/trace/beauty/include/uapi/linux/vhost.h b/tools/perf/trace/beauty/include/uapi/linux/vhost.h
> index d4b3e2ae1314d1fc..c57674a6aa0dbbea 100644
> --- a/tools/perf/trace/beauty/include/uapi/linux/vhost.h
> +++ b/tools/perf/trace/beauty/include/uapi/linux/vhost.h
> @@ -235,4 +235,39 @@
>   */
>  #define VHOST_VDPA_GET_VRING_SIZE	_IOWR(VHOST_VIRTIO, 0x82,	\
>  					      struct vhost_vring_state)
> +
> +/* Extended features manipulation */
> +#define VHOST_GET_FEATURES_ARRAY _IOR(VHOST_VIRTIO, 0x83, \
> +				       struct vhost_features_array)
> +#define VHOST_SET_FEATURES_ARRAY _IOW(VHOST_VIRTIO, 0x83, \
> +				       struct vhost_features_array)
> +
> +/* fork_owner values for vhost */
> +#define VHOST_FORK_OWNER_KTHREAD 0
> +#define VHOST_FORK_OWNER_TASK 1
> +
> +/**
> + * VHOST_SET_FORK_FROM_OWNER - Set the fork_owner flag for the vhost device,
> + * This ioctl must called before VHOST_SET_OWNER.
> + * Only available when CONFIG_VHOST_ENABLE_FORK_OWNER_CONTROL=y
> + *
> + * @param fork_owner: An 8-bit value that determines the vhost thread mode
> + *
> + * When fork_owner is set to VHOST_FORK_OWNER_TASK(default value):
> + *   - Vhost will create vhost worker as tasks forked from the owner,
> + *     inheriting all of the owner's attributes.
> + *
> + * When fork_owner is set to VHOST_FORK_OWNER_KTHREAD:
> + *   - Vhost will create vhost workers as kernel threads.
> + */
> +#define VHOST_SET_FORK_FROM_OWNER _IOW(VHOST_VIRTIO, 0x84, __u8)
> +
> +/**
> + * VHOST_GET_FORK_OWNER - Get the current fork_owner flag for the vhost device.
> + * Only available when CONFIG_VHOST_ENABLE_FORK_OWNER_CONTROL=y
> + *
> + * @return: An 8-bit value indicating the current thread mode.
> + */
> +#define VHOST_GET_FORK_FROM_OWNER _IOR(VHOST_VIRTIO, 0x85, __u8)
> +
>  #endif
> -- 
> 2.51.0.261.g7ce5a0a67e-goog