Re: [libvirt] [PATCH] qemu: Fix PCI address allocation

When attaching a PCI device which doesn't explicitly set its PCI address, libvirt allocates the address automatically. The problem is that when checking which PCI address is unused, we only check for those with slot number higher than the highest slot number ever used. Thus attaching/detaching such device several times in a row (31 is the theoretical limit, less then 30 tries are enough in practise) makes any further device attachment fail. Furthermore, attaching a device with predefined PCI address to 0:0:31 immediately forbids attachment of any PCI device without explicit address. This patch changes the logic so that we always check all PCI addresses before we say there is no PCI address available. --- src/qemu/qemu_conf.c | 14 ++++---------- 1 files changed, 4 insertions(+), 10 deletions(-) diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index 57bc02f..eaebcc1 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -2055,8 +2055,6 @@ qemuAssignDeviceAliases(virDomainDefPtr def, unsigned long long qemuCmdFlags) #define QEMU_PCI_ADDRESS_LAST_SLOT 31 struct _qemuDomainPCIAddressSet { virHashTablePtr used; - int nextslot; - /* XXX add domain, bus later when QEMU allows > 1 */

- for (i = addrs->nextslot ; i <= QEMU_PCI_ADDRESS_LAST_SLOT ; i++) { + for (i = 0 ; i <= QEMU_PCI_ADDRESS_LAST_SLOT ; i++) {