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

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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: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Zhao Yan <yan.y.zhao@intel.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Zhao Yan 2018-12-05 02:58:30 -05:00 committed by Anthony PERARD
parent 6c4f984463
commit 92dbfcc6d4
2 changed files with 9 additions and 1 deletions
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6
hw/xen/xen_pt.c
View File

@ -847,6 +847,12 @@ static void xen_pt_realize(PCIDevice *d, Error **errp)
} }
machine_irq = s->real_device.irq; 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); rc = xc_physdev_map_pirq(xen_xc, xen_domid, machine_irq, &pirq);
if (rc < 0) { if (rc < 0) {
error_setg_errno(errp, errno, "Mapping machine irq %u to" error_setg_errno(errp, errno, "Mapping machine irq %u to"

4
hw/xen/xen_pt_config_init.c
View File

@ -300,7 +300,9 @@ static int xen_pt_irqpin_reg_init(XenPCIPassthroughState *s,
XenPTRegInfo *reg, uint32_t real_offset, XenPTRegInfo *reg, uint32_t real_offset,
uint32_t *data) uint32_t *data)
{ {
*data = xen_pt_pci_read_intx(s); if (s->real_device.irq) {
*data = xen_pt_pci_read_intx(s);
}
return 0; return 0;
} }