vtd: improve IOMMU TLB flush
authorJan Beulich <jbeulich@suse.com>
Tue, 7 Jul 2020 12:37:46 +0000 (14:37 +0200)
committerJan Beulich <jbeulich@suse.com>
Tue, 7 Jul 2020 12:37:46 +0000 (14:37 +0200)
commit5fe515a0fede07543f2a3b049167b1fd8b873caf
tree6b1c88514530554fac13afe02e477be371d9273b
parentbc3d9f95d661372b059a5539ae6cb1e79435bb95
vtd: improve IOMMU TLB flush

Do not limit PSI flushes to order 0 pages, in order to avoid doing a
full TLB flush if the passed in page has an order greater than 0 and
is aligned. Should increase the performance of IOMMU TLB flushes when
dealing with page orders greater than 0.

This is part of XSA-321.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
xen/drivers/passthrough/vtd/iommu.c