At last, the cause is found. /lib/udev/rules.d/70-udev-acl.rules adds
an acl to /dev/kvm denying group write perms. (qemu-kvm installs its
own /lib/udev/rules.d/40-qemu-kvm.rules when qemu-kvm is installed) The
qemu-kvm.postinst does chgrp and chmod /dev/kvm, but "chmod g+rw" does
not remove the group-rw acl. qemu-kvm.postinst needs to manually remove
that acl.
** Changed in: qemu-kvm (Ubuntu)
Status: Triaged => In Progress
** Also affects: qemu-kvm (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: qemu-kvm (Ubuntu Quantal)
Importance: Undecided
Status: New
** Also affects: qemu-kvm (Ubuntu Raring)
Importance: High
Status: In Progress
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You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to qemu-kvm in Ubuntu.
https://bugs.launchpad.net/bugs/1057024
Title:
kvm kernel module always loaded, without setting /dev/kvm permissions
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