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Re: [QEMU PATCH v10] xen/passthrough: use gsi to map pirq when dom0 is PVH
- To: Jiqian Chen <Jiqian.Chen@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, "Paul Durrant" <paul@xxxxxxx>, "Edgar E . Iglesias" <edgar.iglesias@xxxxxxxxx>
- From: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- Date: Mon, 11 Nov 2024 13:53:53 -0500
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- Cc: <qemu-devel@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Huang Rui <ray.huang@xxxxxxx>
- Delivery-date: Mon, 11 Nov 2024 18:54:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11/6/24 01:14, Jiqian Chen wrote:
> In PVH dom0, when passthrough a device to domU, QEMU code
> xen_pt_realize->xc_physdev_map_pirq wants to use gsi, but in current codes
> the gsi number is got from file /sys/bus/pci/devices/<sbdf>/irq, that is
> wrong, because irq is not equal with gsi, they are in different spaces, so
> pirq mapping fails.
>
> To solve above problem, use new interface of Xen, xc_pcidev_get_gsi to get
> gsi and use xc_physdev_map_pirq_gsi to map pirq when dom0 is PVH.
>
> 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: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
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