On 26/01/2021 16:31, Jan Beulich wrote: > When discussing the shrunk down version of the commit in question it > was said (in reply to my conditional choosing of the width): > > "However, the 32bit case isn't actually interesting here. A > guest can't execute a SYSCALL instruction on/across the 4G->0 boundary > because the M2P is mapped NX up to the 4G boundary, so we can never > reach this point with %eip < 2. > > Therefore, the 64bit-only form is the appropriate one to use, which > solves any question of cleverness, or potential decode stalls it > causes." > > Fixes: ca6fcf4321b3 ("x86/pv: Inject #UD for missing SYSCALL callbacks") > Signed-off-by: Jan Beulich <jbeul...@suse.com>
Crap. I folded the fix into my wrong tree. Sorry. Reviewed-by: Andrew Cooper <andrew.coop...@citrix.com> ~Andrew