-
Jan Beulich authored
While it is okay for IOMMU page tables to be set up for guests starting in PoD mode, actual device assignment may only occur once all PoD entries have been removed from the P2M. So far this was enforced only for boot-time assignment, and only in the tool stack. Also use the new function to replace p2m_pod_entry_count(): Its unlocked access to p2m->pod.entry_count wasn't really okay (irrespective of the result being stale by the time the caller gets to see it). Nor was the use of that function in line with the immediately preceding comment: A PoD guest isn't just one with a non-zero entry count, but also one with a non-empty cache (e.g. prior to actually launching the guest). To allow the tool stack to see a consistent snapshot of PoD state, move the tail of XENMEM_{get,set}_pod_target handling into a function, adding proper locking there. In libxl take the liberty to use the new local variable r also for a pre-existing call into libxc. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
ad4312d7