[libvirt] [PATCH 1/8] util: new function virPCIDeviceGetVFIOGroupDev
Given a virPCIDevice, this function returns the path for the device
that controls the vfio group the device belongs to,
e.g. "/dev/vfio/15".
---
src/libvirt_private.syms | 1 +
src/util/virpci.c | 34 ++++++++++++++++++++++++++++++++++
src/util/virpci.h | 2 ++
3 files changed, 37 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 33ec379..2a2c40e 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1609,6 +1609,7 @@ virPCIDeviceGetReprobe;
virPCIDeviceGetStubDriver;
virPCIDeviceGetUnbindFromStub;
virPCIDeviceGetUsedBy;
+virPCIDeviceGetVFIOGroupDev;
virPCIDeviceIsAssignable;
virPCIDeviceListAdd;
virPCIDeviceListCount;
diff --git a/src/util/virpci.c b/src/util/virpci.c
index 73f36d0..673568f 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -1726,6 +1726,40 @@ cleanup:
return ret;
}
+/* virPCIDeviceGetVFIOGroupDev - return the name of the device used to
+ * control this PCI device's group (e.g. "/dev/vfio/15")
+ */
+char *
+virPCIDeviceGetVFIOGroupDev(virPCIDevicePtr dev)
+{
+ char *devPath = NULL;
+ char *groupPath = NULL;
+ char *groupDev = NULL;
+
+ if (virPCIFile(&devPath, dev->name, "iommu_group") < 0)
+ goto cleanup;
+ if (virFileIsLink(devPath) != 1) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Invalid device %s iommu_group file %s is not a
symlink"),
+ dev->name, devPath);
+ goto cleanup;
+ }
+ if (virFileResolveLink(devPath, &groupPath) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Unable to resolve device %s iommu_group symlink
%s"),
+ dev->name, devPath);
+ goto cleanup;
+ }
+ if (virAsprintf(&groupDev, "/dev/vfio/%s", basename(groupPath)) < 0)
{
+ virReportOOMError();
+ goto cleanup;
+ }
+cleanup:
+ VIR_FREE(devPath);
+ VIR_FREE(groupPath);
+ return groupDev;
+}
+
static int
virPCIDeviceDownstreamLacksACS(virPCIDevicePtr dev)
{
diff --git a/src/util/virpci.h b/src/util/virpci.h
index db0be35..3911b72 100644
--- a/src/util/virpci.h
+++ b/src/util/virpci.h
@@ -111,6 +111,8 @@ typedef int (*virPCIDeviceFileActor)(virPCIDevicePtr dev,
int virPCIDeviceFileIterate(virPCIDevicePtr dev,
virPCIDeviceFileActor actor,
void *opaque);
+char *
+virPCIDeviceGetVFIOGroupDev(virPCIDevicePtr dev);
int virPCIDeviceIsAssignable(virPCIDevicePtr dev,
int strict_acs_check);
--
1.7.11.7