On 10.02.2020 13:09, Roger Pau Monné wrote: > On Mon, Feb 10, 2020 at 11:42:06AM +0000, Andrew Cooper wrote: >> Writing to the stack pointer in the middle of a line of pop operations is >> specifically recommended against by the optimisation guide, and is a >> technique >> used by Speculative Load Hardening to combat SpectreRSB. >> >> In practice, it causes all further stack-relative accesses to block until the >> write to the stack pointer retires, so the stack engine can get back in sync. >> >> Pop into any dead register to discard %rax's value without clobbering the >> stack engine. Smaller compiled code, and runs faster. >> >> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> > > Reviewed-by: Roger Pau Monné <roger....@citrix.com>
Acked-by: Jan Beulich <jbeul...@suse.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
