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Re: [XEN PATCH v15 1/4] x86/hvm: allow {,un}map_pirq hypercalls unconditionally
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Sep 2024 09:36:37 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Sep 2024 07:36:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.09.2024 08:58, Jiqian Chen wrote:
> The current hypercall interfaces to manage and assign interrupts to
> domains is mostly based in using pIRQs as handlers. Such pIRQ values
> are abstract domain-specific references to interrupts.
>
> Classic HVM domains can have access to {,un}map_pirq hypercalls if the
> domain is allowed to route physical interrupts over event channels.
> That's however a different interface, limited to only mapping
> interrupts to itself. PVH domains on the other hand never had access
> to the interface, as PVH domains are not allowed to route interrupts
> over event channels.
>
> In order to allow setting up PCI passthrough from a PVH domain it
> needs access to the {,un}map_pirq hypercalls so interrupts can be
> assigned a pIRQ handler that can then be used by further hypercalls to
> bind the interrupt to a domain.
>
> Note that the {,un}map_pirq hypercalls end up calling helpers that are
> already used against a PVH domain in order to setup interrupts for the
> hardware domain when running in PVH mode. physdev_map_pirq() will
> call allocate_and_map_{gsi,msi}_pirq() which is already used by the
> vIO-APIC or the vPCI code respectively. So the exposed code paths are
> not new when targeting a PVH domain, but rather previous callers are
> not hypercall but emulation based.
>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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