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[libvirt] [PATCH 13/22] API & qemu: add ability to detach an entire VFIO group of devices



This provides a frontend for the virpci internal "detach_group"
flag. When virNodeDeviceDetachFlags is given the flag
VIR_NODE_DEVICE_DETACH_GROUP (and the specified driver is "vfio"), all
devices in the same VFIO group with the specified device will be
detached from the host and bound to the vfio-pci driver (unless they
have already been bound to either the pci-stub driver or pcieport
driver, both of which are acceptable substitutes in the eyes of VFIO).
---
 include/libvirt/libvirt.h.in | 10 ++++++++++
 src/qemu/qemu_driver.c       |  5 ++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index acf3218..ba471b2 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -3291,6 +3291,16 @@ char *                  virNodeDeviceGetXMLDesc (virNodeDevicePtr dev,
 int                     virNodeDeviceRef        (virNodeDevicePtr dev);
 int                     virNodeDeviceFree       (virNodeDevicePtr dev);
 
+/*
+ * virNodeDeviceDetachFlags:
+ *
+ * Flags that can be sent to the virNodeDeviceDetachFlags() API.
+ *
+ */
+typedef enum {
+    VIR_NODE_DEVICE_DETACH_GROUP = 1 << 0, /* detach all devices in same group */
+} virNodeDeviceDetachFlagsType;
+
 int                     virNodeDeviceDettach    (virNodeDevicePtr dev);
 int                     virNodeDeviceDetachFlags(virNodeDevicePtr dev,
                                                  const char *driverName,
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 8f498e6..dc6f2cd 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -10275,7 +10275,7 @@ qemuNodeDeviceDetachFlags(virNodeDevicePtr dev,
     unsigned domain, bus, slot, function;
     int ret = -1;
 
-    virCheckFlags(0, -1);
+    virCheckFlags(VIR_NODE_DEVICE_DETACH_GROUP, -1);
 
     if (qemuNodeDeviceGetPciInfo(dev, &domain, &bus, &slot, &function) < 0)
         return -1;
@@ -10285,9 +10285,12 @@ qemuNodeDeviceDetachFlags(virNodeDevicePtr dev,
         return -1;
 
     if (!driverName || STREQ(driverName, "kvm")) {
+        virCheckFlags(0, -1);
         if (virPCIDeviceSetStubDriver(pci, "pci-stub") < 0)
             goto out;
     } else if (STREQ(driverName, "vfio")) {
+        virPCIDeviceSetAttachGroup(pci,
+                                   !!(flags & VIR_NODE_DEVICE_DETACH_GROUP));
         if (virPCIDeviceSetStubDriver(pci, "vfio-pci") < 0)
             goto out;
     } else {
-- 
1.7.11.7


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