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Re: [PATCH v2 4/4] vPCI/DomU: really no ext-caps without extended config space
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- Date: Mon, 26 Jan 2026 10:52:49 -0500
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Mon, 26 Jan 2026 15:53:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 1/19/26 09:48, Jan Beulich wrote:
> Whether to emulate accesses to the first 32 bits of extended config space
> as read-as-zero or read-as-all-ones depends on whether a device actually
> has extended config space. If it doesn't, read-as-zero isn't correct; not
> getting this right may confuse functions like Linux 6.19-rc's
> pci_ext_cfg_is_aliased().
>
> Fixes: a845b50c12f3 ("vpci/header: Emulate extended capability list for dom0")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
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