>>> On 21.03.18 at 13:51, <jgr...@suse.com> wrote: > Today cpu_info->xen_cr3 is either 0 to indicate %cr3 doesn't need to > be switched on entry to Xen, or negative for keeping the value while > indicating not to restore %cr3, or positive in case %cr3 is to be > restored. > > Switch to use a flag byte instead of a negative xen_cr3 value in order > to allow %cr3 values with the high bit set in case we want to keep TLB > entries when using the PCID feature. > > This reduces the number of branches in interrupt handling and results > in better performance (e.g. parallel make of the Xen hypervisor on my > system was using about 3% less system time). > > Signed-off-by: Juergen Gross <jgr...@suse.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
