Re: [QEMU PATCH v10] xen/passthrough: use gsi to map pirq when dom0 is PVH

[Anthony PERARD <anthony@xenproject.org>]

On Wed, Nov 06, 2024 at 02:14:18PM +0800, 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@amd.com>
> Signed-off-by: Huang Rui <ray.huang@amd.com>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@amd.com>

Acked-by: Anthony PERARD <anthony@xenproject.org>

But, this following change probably needs an ack from PCI maintaners,
CCed.

> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index eb26cac81098..07805aa8a5f3 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -23,6 +23,10 @@ extern bool pci_available;
>  #define PCI_SLOT_MAX            32
>  #define PCI_FUNC_MAX            8
>  
> +#define PCI_SBDF(seg, bus, dev, func) \
> +            ((((uint32_t)(seg)) << 16) | \
> +            (PCI_BUILD_BDF(bus, PCI_DEVFN(dev, func))))
> +
>  /* Class, Vendor and Device IDs from Linux's pci_ids.h */
>  #include "hw/pci/pci_ids.h"

Thanks,

-- 
Anthony PERARD