> On Jun 15, 2020, at 1:56 PM, Luck, Tony <tony.l...@intel.com> wrote: > > >> >> Are we planning to keep PASID live once a task has used it once or are we >> going to swap it lazily? If the latter, a percpu variable might be better. > > Current plan is "touch it once and the task owns it until exit(2)" > > Maybe someday in the future when we have data on how applications > actually use accelerators we could look at something more complex > if usage patterns look like it would be beneficial. > >
So what’s the RDMSR for? Surely you have some state somewhere that says “this task has a PASID.” Can’t you just make sure that stays in sync with the MSR? Then, on #GP, if the task already has a PASID, you know the MSR is set. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
