Commit 92dbfcc6 authored by Zhao Yan's avatar Zhao Yan Committed by Anthony PERARD
Browse files

xen/pt: allow passthrough of devices with bogus interrupt pin 



For some pci device, even its PCI_INTERRUPT_PIN is not 0, it actually
doesn't support INTx mode, so its machine irq read from host sysfs is 0.
In that case, report PCI_INTERRUPT_PIN as 0 to guest and let passthrough
continue.

Reviewed-by: default avatarRoger Pau Monné <roger.pau@citrix.com>
Signed-off-by: default avatarZhao Yan <yan.y.zhao@intel.com>
Acked-by: default avatarAnthony PERARD <anthony.perard@citrix.com>
Signed-off-by: default avatarAnthony PERARD <anthony.perard@citrix.com>
parent 6c4f9844

hw/xen/xen_pt.c

+6 −0
Original line number Diff line number Diff line
@@ -847,6 +847,12 @@ static void xen_pt_realize(PCIDevice *d, Error **errp) 
    }



    machine_irq = s->real_device.irq;

    if (machine_irq == 0) {

        XEN_PT_LOG(d, "machine irq is 0\n");

        cmd |= PCI_COMMAND_INTX_DISABLE;

        goto out;

    }



    rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);

    if (rc < 0) {

        error_setg_errno(errp, errno, "Mapping machine irq %u to"

hw/xen/xen_pt_config_init.c

+3 −1
Original line number Diff line number Diff line
@@ -300,7 +300,9 @@ static int xen_pt_irqpin_reg_init(XenPCIPassthroughState *s, 
                                  XenPTRegInfo *reg, uint32_t real_offset,

                                  uint32_t *data)

{

    if (s->real_device.irq) {

        *data = xen_pt_pci_read_intx(s);

    }

    return 0;

}