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Re: [PATCH v3 4/6] vPCI: really no ext-caps without extended config space
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Thu, 29 Jan 2026 15:13:50 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- Delivery-date: Thu, 29 Jan 2026 14:14:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Jan 29, 2026 at 02:09:27PM +0100, Jan Beulich wrote:
> For DomU-s, 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().
>
> For Dom0 this then simply allows dropping a later conditional.
>
> Fixes: a845b50c12f3 ("vpci/header: Emulate extended capability list for dom0")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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