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Re: [XEN PATCH v13 2/6] x86/pvh: Allow (un)map_pirq when dom0 is PVH
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 19 Aug 2024 11:08:01 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, George Dunlap <gwd@xxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Stewart Hildebrand <Stewart.Hildebrand@xxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 19 Aug 2024 09:08:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.08.2024 13:08, Jiqian Chen wrote:
> If run Xen with PVH dom0 and hvm domU, hvm will map a pirq for
> a passthrough device by using gsi, see qemu code
> xen_pt_realize->xc_physdev_map_pirq and libxl code
> pci_add_dm_done->xc_physdev_map_pirq. Then xc_physdev_map_pirq
> will call into Xen, but in hvm_physdev_op, PHYSDEVOP_map_pirq
> is not allowed because currd is PVH dom0 and PVH has no
> X86_EMU_USE_PIRQ flag, it will fail at has_pirq check.
>
> So, allow PHYSDEVOP_map_pirq when dom0 is PVH and also allow
> iPHYSDEVOP_unmap_pirq for the removal device path to unmap pirq.
> So that the interrupt of a passthrough device can be successfully
> mapped to pirq for domU with a notion of PIRQ when dom0 is PVH.
>
> To exposing the functionality to wider than (presently) necessary
> audience(like PVH domU), so it doesn't add any futher restrictions.
The code change is fine, but I'm struggling with this sentence. I can't
really derive what you're trying to say.
> And there already are some senarios for domains without
> X86_EMU_USE_PIRQ to use these functions.
Are there? If so, pointing out an example may help.
Jan
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