Re: [PATCH] x86/pci/xen: populate MSI sysfs entries

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On 24.05.23 17:43, Maximilian Heyne wrote:
On Wed, May 03, 2023 at 01:16:53PM +0000, Maximilian Heyne wrote:
Commit bf5e758f02fc ("genirq/msi: Simplify sysfs handling") reworked the
creation of sysfs entries for MSI IRQs. The creation used to be in
msi_domain_alloc_irqs_descs_locked after calling ops->domain_alloc_irqs.
Then it moved into __msi_domain_alloc_irqs which is an implementation of
domain_alloc_irqs. However, Xen comes with the only other implementation
of domain_alloc_irqs and hence doesn't run the sysfs population code

Commit 6c796996ee70 ("x86/pci/xen: Fixup fallout from the PCI/MSI
overhaul") set the flag MSI_FLAG_DEV_SYSFS for the xen msi_domain_info
but that doesn't actually have an effect because Xen uses it's own
domain_alloc_irqs implementation.

Fix this by making use of the fallback functions for sysfs population.

Fixes: bf5e758f02fc ("genirq/msi: Simplify sysfs handling")
Signed-off-by: Maximilian Heyne <mheyne@xxxxxxxxx>

Any other feedback on this one? This is definitely a bug but I understand that
there might be different ways to fix it.

I'd be happy to take the patch via the Xen tree, but I think x86 maintainers
should at least ack that.


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