do not fake Xen blk & net controllers on dom0 (mga#9546)

2 files changed, 12 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 2a69f01..4fc7aea 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,5 @@
+- do not fake Xen blk & net controllers on dom0 (mga#9546)
+
 Version 0.12.6 - 31 March 2013, Thierry Vignaud
 
 - add support for detecting Xen blk & net controllers (mga#9546)
diff --git a/pci.c b/pci.c
index 57f67ab..c841bbe 100644
--- a/pci.c
+++ b/pci.c
@@ -54,6 +54,16 @@ static void detect_xen(struct pciusb_entries *r) {
 	struct stat sb;
 	if (stat("/sys/bus/xen", &sb) != 0)
 		return;
+	FILE *f;
+	if (!(f = fopen("/sys/hypervisor/uuid", "r")))
+	  return;
+	char buf[38];
+	fgets(buf, sizeof(buf) - 1, f);
+	fclose(f);
+	if (!strncmp(buf, "00000000-0000-0000-0000-000000000000", sizeof(buf)))
+	  return;
+
+	// We're now sure to be in a Xen guest:
 
 	struct pciusb_entry *e = &r->entries[r->nb++];
 	pciusb_initialize(e);