Re: [PATCH 1/4] virtio_console: copy pipe buffers in splice_write()

[Zi Yan <ziy@nvidia.com>]

On 10 Nov 2026, at 9:52, Kiryl Shutsemau (Meta) wrote:

> pipe_to_sg() tries to steal the page of each pipe buffer and pass it to
> the host as it is.  When the steal fails, it copies the data into a page
> of its own.
>
> Pages written into the pipe with write(), gifted user pages and page
> cache pages can be stolen.  The ftrace ring buffer pages that
> virtio-trace splices cannot, so that in-tree user always gets the copy.
>
> Always copy.  The data that reaches the host does not change.
>
> Preparation for removing ->try_steal() from pipe buffers.
>
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> ---
>  drivers/char/virtio_console.c | 39 +++++++++++++----------------------
>  1 file changed, 14 insertions(+), 25 deletions(-)
>
LGTM.

Acked-by: Zi Yan <ziy@nvidia.com>

Best Regards,
Yan, Zi