On 19/04/2021 16:55, Jan Beulich wrote: > On 19.04.2021 16:45, Andrew Cooper wrote: >> Factor out a compat boolean to remove the lfence overhead from multiple >> is_pv_32bit_domain() calls. >> >> For a compat guest, the upper 32 bits of rdx are zero, so there is no need to >> have any conditional logic at all when mapping the start info page. > Iirc the contents of the upper halves hold unspecified contents after > a switch from compat to 64-bit mode. Therefore only with this part of > the change dropped ...
But we're shim, so will never ever mix compat and non-compat guests. ~Andrew > >> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> > Reviewed-by: Jan Beulich <jbeul...@suse.com> > > Jan
