[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v5 2/7] x86/xpti: don't flush TLB twice when switching to 64-bit pv context
On 06/04/18 13:21, Andrew Cooper wrote: > On 06/04/18 08:52, Juergen Gross wrote: >> When switching to a 64-bit pv context the TLB is flushed twice today: >> the first time when switching to the new address space in >> write_ptbase(), the second time when switching to guest mode in >> restore_to_guest. >> >> Limit the first flush to non-global entries in that case. >> >> Signed-off-by: Juergen Gross <jgross@xxxxxxxx> >> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> > > This isn't safe. If any speculation/prefetching happens into the new > guest mappings, we will get machine check exceptions. Okay, I'll drop that patch (it is more or less undone by patch 4 anyway). Juergen _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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