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Re: [XEN PATCH v16 1/3] x86/irq: allow setting IRQ permissions from GSI instead of pIRQ
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 30 Sep 2024 09:31:09 +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: Mon, 30 Sep 2024 07:31:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.09.2024 05:42, Jiqian Chen wrote:
> Some domains are not aware of the pIRQ abstraction layer that maps
> interrupt sources into Xen space interrupt numbers. pIRQs values are
> only exposed to domains that have the option to route physical
> interrupts over event channels.
>
> This creates issues for PCI-passthrough from a PVH domain, as some of
> the passthrough related hypercalls use pIRQ as references to physical
> interrupts on the system. One of such interfaces is
> XEN_DOMCTL_irq_permission, used to grant or revoke access to
> interrupts, takes a pIRQ as the reference to the interrupt to be
> adjusted.
>
> Since PVH doesn't manage interrupts in terms of pIRQs, introduce a new
> hypercall that allows setting interrupt permissions based on GSI value
> rather than pIRQ.
>
> Note the GSI hypercall parameters is translated to an IRQ value (in
> case there are ACPI overrides) before doing the checks.
>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
> Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@xxxxxxx>
> Reviewed-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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