On 10/02/2021 16:48, Jan Beulich wrote: > The address of this page is used by the CPU only to recognize when to > instead access the virtual APIC page instead. No accesses would ever go > to this page. It only needs to be present in the (CPU) page tables so > that address translation will produce its address as result for > respective accesses. > > By making this page global, we also eliminate the need to refcount it, > or to assign it to any domain in the first place. > > Signed-off-by: Jan Beulich <jbeul...@suse.com>
How certain are you about this? It's definitely not true on AMD's AVIC - writes very definitely end up in the backing page if they miss the APIC registers. This concern was why we didn't use a global page originally, IIRC. ~Andrew
