Re: [PATCH v13 05/19] PCI/P2PDMA: Evaluate ACS controls at the path divergence

[sashiko-bot@kernel.org]

> From: Leon Romanovsky <leonro@nvidia.com>
> 
> ACS redirect controls below the path divergence reject valid nested
> topologies, where traffic already has only an upstream route. Sibling
> functions can lack an internal peer route even with redirect controls
> clear, so ignoring their shared ports can incorrectly permit bus
> addressing.
> 
> Evaluate directional controls at the divergence and account separately for
> unsupported internal routes between functions sharing a PCIe link. Check
> Upstream Forwarding at every shared Downstream and Root Port only when a
> host route is needed. Reject unreadable controls needed for that route,
> and keep redirect advice when clearing controls restores a direct route.
> 
> Fixes: 52916982af48 ("PCI/P2PDMA: Support peer-to-peer memory")
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261105-fix-p2p-acs-v4-0-v13-0-3dd065907c3b@nvidia.com?part=5