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vfio/pci: Add virtual capabilities quirk infrastructure 

If the hypervisor needs to add purely virtual capabilties, give us a
hook through quirks to do that.  Note that we determine the maximum
size for a capability based on the physical device, if we insert a
virtual capability, that can change.  Therefore if maximum size is
smaller after added virt capabilities, use that.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2017-08-29 16:05:39 -06:00
parent 5b31c8229d
commit e3f79f3bd4
3 changed files with 13 additions and 0 deletions
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4
hw/vfio/pci-quirks.c
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@ -1850,3 +1850,7 @@ void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev)
break;
}
}
int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp)
{
return 0;
}

8
hw/vfio/pci.c
View File

@ -1833,8 +1833,16 @@ static int vfio_add_std_cap(VFIOPCIDevice *vdev, uint8_t pos, Error **errp)
pdev->config[PCI_CAPABILITY_LIST] = 0;
vdev->emulated_config_bits[PCI_CAPABILITY_LIST] = 0xff;
vdev->emulated_config_bits[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
ret = vfio_add_virt_caps(vdev, errp);
if (ret) {
return ret;
}
}
/* Scale down size, esp in case virt caps were added above */
size = MIN(size, vfio_std_cap_max_size(pdev, pos));
/* Use emulated next pointer to allow dropping caps */
pci_set_byte(vdev->emulated_config_bits + pos + PCI_CAP_LIST_NEXT, 0xff);

1
hw/vfio/pci.h
View File

@ -160,6 +160,7 @@ void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr);
void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr);
void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr);
void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev);
int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp);
int vfio_populate_vga(VFIOPCIDevice *vdev, Error **errp);