From: Benjamin Leggett <benjamin@edera.io>
To: sashiko-reviews@lists.linux.dev
Cc: dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/virtio: use the DMA API for resource backing on Xen
Date: Thu, 06 Aug 2026 22:55:16 -0400 [thread overview]
Message-ID: <875x1m8wrv.fsf@edera.io> (raw)
In-Reply-To: <20260806231002.27B4D1F000E9@smtp.kernel.org>
sashiko-bot@kernel.org writes:
> [Severity: High]
> This is a pre-existing issue, but while enabling the DMA API for Xen PV
> domains, does this leave guest-bound transfers vulnerable to data corruption
> with SWIOTLB bounce buffers?
Yep, preexisting issue, but not reachable via plain `virtio-vga`.
Only reachable, AFAICT, if `has_virgl_3d` is enabled. The missing `_for_cpu`` sync
is pre-existing since 8f44ca223345 and pretty orthogonal to this change.
A correct fix most likely belongs in the completion path rather than at submission,
anyway, so I’m not sure it makes a lot of sense to include in this patch.
Happy to do that in a followup/separate patch, if requested.
Ben
next prev parent reply other threads:[~2026-08-07 2:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-06 22:54 [PATCH] drm/virtio: use the DMA API for resource backing on Xen Benjamin Leggett via B4 Relay
2026-08-06 23:10 ` sashiko-bot
2026-08-06 23:53 ` Benjamin Leggett
2026-08-07 2:55 ` Benjamin Leggett [this message]
2026-08-11 15:49 ` Dmitry Osipenko
2026-08-14 13:41 ` Dmitry Osipenko
2026-08-18 17:48 ` Benjamin Leggett
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