Re: [Xen-devel] [PATCH v4 2/7] x86/xpti: don't flush TLB twice when switching to 64-bit pv context

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.03.18 at 11:06, <jgross@xxxxxxxx> 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.
> 
> Avoid the first TLB flush in that case.

This isn't entirely correct - what you avoid is just the flushing of
global entries. Perhaps "Limit the first flush to non-global entries"?

> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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