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qemu: only request sound cgroup ACL when required

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When a SPICE or VNC graphics controller is present, and sound is
piggybacked over a channel to the graphics device rather than
directly accessing host hardware, then there is no need to grant
host hardware access to that qemu process.

* src/qemu/qemu_cgroup.c (qemuSetupCgroup): Prevent sound with
spice, and with vnc when vnc_allow_host_audio is 0.
Reported by Daniel Berrange.
This commit is contained in:
Eric Blake 2011-02-25 11:55:44 -07:00
parent 3c37a171a2
commit 7c6b22c4d5
1 changed files with 5 additions and 1 deletions
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6
src/qemu/qemu_cgroup.c
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@ -241,7 +241,11 @@ int qemuSetupCgroup(struct qemud_driver *driver,
goto cleanup;
}
if (vm->def->nsounds) {
if (vm->def->nsounds &&
(!vm->def->ngraphics ||
((vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC &&
driver->vncAllowHostAudio) ||
(vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SDL)))) {
rc = virCgroupAllowDeviceMajor(cgroup, 'c', DEVICE_SND_MAJOR);
qemuDomainCgroupAudit(vm, cgroup, "allow", "major", "sound",
rc == 0);