Re: [PATCH] PCI/MSI: Initialize the prepare descriptor by default

[Naman Jain]

On 7/8/2025 3:32 PM, Shradha Gupta wrote:
> On Tue, Jul 08, 2025 at 10:48:48AM +0530, Naman Jain wrote:
> > Plug the default MSI-X prepare descriptor for non-implemented ops by
> > default to workaround the inability of Hyper-V vPCI module to setup
> > the MSI-X descriptors properly; especially for dynamically allocated
> > MSI-X.
> >
> > Signed-off-by: Naman Jain <namjain@xxxxxxxxxxxxxxxxxxx>
> > ---
> >   drivers/pci/msi/irqdomain.c | 2 ++
> >   1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
> > index 765312c92d9b..655e99b9c8cc 100644
> > --- a/drivers/pci/msi/irqdomain.c
> > +++ b/drivers/pci/msi/irqdomain.c
> > @@ -84,6 +84,8 @@ static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
> >   	} else {
> >   		if (ops->set_desc == NULL)
> >   			ops->set_desc = pci_msi_domain_set_desc;
> > +		if (ops->prepare_desc == NULL)
> > +			ops->prepare_desc = pci_msix_prepare_desc;
> >   	}
> >   }
> >   
> >
> > base-commit: 26ffb3d6f02cd0935fb9fa3db897767beee1cb2a
> > --
> > 2.34.1
>
> Hey Naman,
>
> can you please try your tests with this patch:
> https://lore.kernel.org/all/1749651015-9668-1-git-send-email-shradhagupta@xxxxxxxxxxxxxxxxxxx/
> I think this should help your use case
>
> Regards,
> Shradha.

Hey,
Thanks for sharing this, this works for me.

Closing this thread.

Regards,
Naman