[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [TESTDAY] Test report
On Fri, Nov 15, 2019 at 4:56 AM Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote: > > On 14/11/2019 22:36, Tamas K Lengyel wrote: > > On Thu, Nov 14, 2019 at 11:39 AM Andrew Cooper > > <andrew.cooper3@xxxxxxxxxx> wrote: > >> On 14/11/2019 18:34, Tamas K Lengyel wrote: > >>> * Comments: All works, altp2m+introspection requires the ept=pml=0 > >>> boot flag specified to workaround a deadlock in Xen > >> Is this separate from the general problem with EPT A/D and > >> write-protecting pagetables? > >> > > It sounds like it is, it happens without write-protecting in-guest > > pagetables. I didn't have time to investigate where the deadlock > > happens and since the workaround is fine for the usecase it wasn't a > > priority to figure out. > > Thinking about it, PML will do the wrong thing (deadlocks aside) as soon > as any altp2m gfn translations are used. > > I'd be tempted to work around the deadlock by disabling pml the moment > altp2m is touched. That would give a sightly less bad user experience, > and should be easy to sort for 4.13. > > Thoughts, (inc. Juergen as RM) ? That sounds like a good idea to me, that way you can keep pml for guests where it doesn't cause an issue instead of disabling it system wide. Tamas _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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