Re: [Xen-devel] [PVH]: Help: msi.c

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Thu, 13 Dec 2012 14:25:16 +0000
Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

> On Thu, 13 Dec 2012, Jan Beulich wrote:
> > >>> On 13.12.12 at 13:19, Stefano Stabellini
> > >>> <stefano.stabellini@xxxxxxxxxxxxx>
> > wrote:
> > > On Thu, 13 Dec 2012, Jan Beulich wrote:
> > >> >>> On 13.12.12 at 02:43, Mukesh Rathor
> > >> >>> <mukesh.rathor@xxxxxxxxxx> wrote:
> 
> Actually I think that you might be right: just looking at the code it
> seems that the mask bits get written to the table once as part of the
> initialization process:
> 
> pci_enable_msix -> msix_capability_init -> msix_program_entries
> 
> Unfortunately msix_program_entries is called few lines after
> arch_setup_msi_irqs, where we call PHYSDEVOP_map_pirq to map the MSI
> as a pirq.
> However after that is done, all the masking/unmask is done via
> irq_mask that we handle properly masking/unmasking the corresponding
> event channels.
> 
> 
> Possible solutions on top of my head:
> 
> - in msix_program_entries instead of writing to the table directly
> (__msix_mask_irq), call desc->irq_data.chip->irq_mask(); 
> 
> - replace msix_program_entries with arch_msix_program_entries, but it
> would probably be unpopular.


Can you or Jan or somebody please take that over? I can focus on other
PVH things then and try to get a patch in asap.

Thanks,
Mukesh


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