>>> On 04.12.18 at 16:22, <paul.durr...@citrix.com> wrote: >> -----Original Message----- >> From: Jan Beulich [mailto:jbeul...@suse.com] >> Sent: 04 December 2018 15:21 >> To: Paul Durrant <paul.durr...@citrix.com> >> Cc: Andrew Cooper <andrew.coop...@citrix.com>; Roger Pau Monne >> <roger....@citrix.com>; Wei Liu <wei.l...@citrix.com>; George Dunlap >> <george.dun...@citrix.com>; xen-devel <xen-devel@lists.xenproject.org> >> Subject: Re: [PATCH v2 4/4] x86/mm/p2m: stop checking for IOMMU shared >> page tables in mmio_order() >> >> >>> On 03.12.18 at 18:40, <paul.durr...@citrix.com> wrote: >> > Now that the iommu_map() and iommu_unmap() operations take an order >> > parameter and elide flushing there's no strong reason why modifying MMIO >> > ranges in the p2m should be restricted to a 4k granularity simply >> because >> > the IOMMU is enabled but shared page tables are not in operation. >> >> I'm afraid the two improvements are not enough for this restriction >> to be lifted: There's still no preemption in the processing of the >> higher order values. > > Why? 1G orders are already ruled out and testing shows that 2M orders cause > no problems on EPYC systems.
Hmm, yes, agreed. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
