[libvirt] [PATCH] pci: Ignore 32-bit PCIe domains

[Keith Busch]

Intel VMD creates secondary PCIe domain, where child devices in this
domain are aggregated behind a single end point. Linux exposes these
as special 32-bit domains, and devices in them are not individually
assignable.

This patch ignores devices in such domains as desired, and prevents
logging excessive errors, like:

  internal error: dev->name buffer overflow: 10000:00:00.0

Cc: Jonathan Derrick <jonathan.derrick at intel.com>
Signed-off-by: Keith Busch <keith.busch at intel.com>
---
 src/util/virpci.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/util/virpci.c b/src/util/virpci.c
index 55e4c3e49..53a6f2e51 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -1762,6 +1762,13 @@ virPCIDeviceNew(unsigned int domain,
     char *vendor = NULL;
     char *product = NULL;
 
+
+    /* Devices in a 32-bit domain are special. Currently applicable to Intel
+     * VMD PCIe, where individual devices are not individually assignable.
+     */
+    if (domain > USHRT_MAX)
+        return NULL;
+
     if (VIR_ALLOC(dev) < 0)
         return NULL;
 
-- 
2.14.3