linux-kernel - Re: [PATCH] p2pdma: Whitelist the QEMU host bridge for x86

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Message-ID: <dbb07d97-433b-4792-bbd7-74033c838d29@deltatee.com>
Date: Tue, 15 Apr 2025 11:00:11 -0600
From: Logan Gunthorpe <logang@...tatee.com>
To: Stephen Bates <sbates@...thlin.com>, bhelgaas@...gle.com,
 linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] p2pdma: Whitelist the QEMU host bridge for x86_64

Hi Stephen,

On 2025-04-14 18:24, Stephen Bates wrote:
> It is useful to be able to develop and test p2pdma applications in
> virtualized environments. Whitelist the QEMU PCI host bridge emulated
> by the default QEMU system for x86_64.

The host bridge is also in real hardware. 82G33 motherboards from c.
2007. Given it's age the real hardware probably doesn't support P2P
transactions, but at the same time it's probably pretty rare and I
wouldn't expect there to be much risk of someone trying and failing a
P2P transaction on such a machine. These things are probably worth
noting in the commit message.

Other than that:

Reviewed-by: Logan Gunthorpe <logang@...tatee.com>

Logan