Hi,
I'm running current git libvirt on Fedora 13 beta. I enabled the use of
libcap-ng as it is done in the regular F13 .spec.
When I now pass a pci card through to a qemu-kvm guest using vt-d I get this
error from qemu-kvm:
Failed to assign irq for "hostdev0": Operation not permitted
Perhaps you are assigning a device that shares an IRQ with another device?
I'm running qemu-kvm as root. But that doesn't seem to be enough:
I traced the issue down to a missing CAP_SYS_RAWIO.The kvm kernel module
requires CAP_SYS_RAWIO to use the KVM_ASSIGN_DEV_IRQ ioctl.
When I remove the capability-dropping from libvirt like this everything works
as expected:
--- libvirt/src/qemu/qemu_driver.c 2010-05-13 22:50:13.000000000 +0200
+++ libvirt.new/src/qemu/qemu_driver.c 2010-05-13 23:18:49.286311290 +0200
@@ -3359,7 +3359,7 @@
ret = virExecDaemonize(argv, progenv, &keepfd, &child,
stdin_fd, &logfile, &logfile,
- VIR_EXEC_NONBLOCK | VIR_EXEC_CLEAR_CAPS,
+ VIR_EXEC_NONBLOCK,
qemudSecurityHook, &hookData,
pidfile);
VIR_FREE(pidfile);
Is there a better solution to get device passthrough to work?
Kind regards,
Gerd
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