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virpci: Introduce and use virPCIDeviceAddressGetIOMMUGroupDev

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Sometimes, we have a PCI address and not fully allocated
virPCIDevice and yet we still want to know its /dev/vfio/N path.
Introduce virPCIDeviceAddressGetIOMMUGroupDev() function exactly
for that.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>
This commit is contained in:
Michal Privoznik 2019-09-19 14:43:13 +02:00
parent cfce298042
commit 081a12aba9
4 changed files with 18 additions and 10 deletions
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1
src/libvirt_private.syms
View File

@ -2709,6 +2709,7 @@ virPCIDeviceAddressAsString;
virPCIDeviceAddressEqual;
virPCIDeviceAddressFree;
virPCIDeviceAddressGetIOMMUGroupAddresses;
virPCIDeviceAddressGetIOMMUGroupDev;
virPCIDeviceAddressGetIOMMUGroupNum;
virPCIDeviceAddressGetSysfsFile;
virPCIDeviceAddressIOMMUGroupIterate;

11
src/qemu/qemu_domain.c
View File

@ -13845,12 +13845,10 @@ qemuDomainGetHostdevPath(virDomainHostdevDefPtr dev,
virDomainHostdevSubsysSCSIPtr scsisrc = &dev->source.subsys.u.scsi;
virDomainHostdevSubsysSCSIVHostPtr hostsrc = &dev->source.subsys.u.scsi_host;
virDomainHostdevSubsysMediatedDevPtr mdevsrc = &dev->source.subsys.u.mdev;
g_autoptr(virPCIDevice) pci = NULL;
g_autoptr(virUSBDevice) usb = NULL;
g_autoptr(virSCSIDevice) scsi = NULL;
g_autoptr(virSCSIVHostDevice) host = NULL;
g_autofree char *tmpPath = NULL;
g_autofree int *tmpPerms = NULL;
int perm = 0;
switch ((virDomainHostdevMode) dev->mode) {
@ -13858,14 +13856,7 @@ qemuDomainGetHostdevPath(virDomainHostdevDefPtr dev,
switch ((virDomainHostdevSubsysType)dev->source.subsys.type) {
case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI:
if (pcisrc->backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_VFIO) {
pci = virPCIDeviceNew(pcisrc->addr.domain,
pcisrc->addr.bus,
pcisrc->addr.slot,
pcisrc->addr.function);
if (!pci)
return -1;
if (!(tmpPath = virPCIDeviceGetIOMMUGroupDev(pci)))
if (!(tmpPath = virPCIDeviceAddressGetIOMMUGroupDev(&pcisrc->addr)))
return -1;
perm = VIR_CGROUP_DEVICE_RW;

15
src/util/virpci.c
View File

@ -1942,6 +1942,21 @@ virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr)
}
char *
virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr)
{
g_autoptr(virPCIDevice) pci = NULL;
if (!(pci = virPCIDeviceNew(devAddr->domain,
devAddr->bus,
devAddr->slot,
devAddr->function)))
return NULL;
return virPCIDeviceGetIOMMUGroupDev(pci);
}
/* virPCIDeviceGetIOMMUGroupDev - return the name of the device used
* to control this PCI device's group (e.g. "/dev/vfio/15")
*/

1
src/util/virpci.h
View File

@ -195,6 +195,7 @@ int virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr devAddr,
virPCIDeviceAddressPtr **iommuGroupDevices,
size_t *nIommuGroupDevices);
int virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr);
char *virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr);
char *virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev);
int virPCIDeviceIsAssignable(virPCIDevicePtr dev,