[PATCH] fhandler_proc.cc(format_proc_cpuinfo): add SERIALIZE instruction flag
Tue Aug 4 08:12:46 GMT 2020
On Aug 3 10:22, Brian Inglis wrote:
> CPUID 7:0 EDX serialize added in linux-next 5.8 by Ricardo Neri-Calderon:
> The Intel architecture defines a set of Serializing Instructions (a
> detailed definition can be found in Vol.3 Section 8.3 of the Intel "main"
> manual, SDM). However, these instructions do more than what is required,
> have side effects and/or may be rather invasive. Furthermore, some of
> these instructions are only available in kernel mode or may cause VMExits.
> Thus, software using these instructions only to serialize execution (as
> defined in the manual) must handle the undesired side effects.
> As indicated in the name, SERIALIZE is a new Intel architecture
> Serializing Instruction. Crucially, it does not have any of the mentioned
> side effects. Also, it does not cause VMExit and can be used in user mode.
> This new instruction is currently documented in the latest "extensions"
> manual (ISE). It will appear in the "main" manual in the future.
> winsup/cygwin/fhandler_proc.cc | 1 +
> 1 file changed, 1 insertion(+)
> diff --git a/winsup/cygwin/fhandler_proc.cc b/winsup/cygwin/fhandler_proc.cc
> index 4bb8bea1766c..72ffa89cdc79 100644
> --- a/winsup/cygwin/fhandler_proc.cc
> +++ b/winsup/cygwin/fhandler_proc.cc
> @@ -1578,6 +1578,7 @@ format_proc_cpuinfo (void *, char *&destbuf)
> ftcprint (features1, 4, "fsrm"); /* fast short REP MOVSB */
> ftcprint (features1, 8, "avx512_vp2intersect"); /* vec intcpt d/q */
> ftcprint (features1, 10, "md_clear"); /* verw clear buf */
> + ftcprint (features1, 14, "serialize"); /* SERIALIZE instruction */
> ftcprint (features1, 18, "pconfig"); /* platform config */
> ftcprint (features1, 19, "arch_lbr"); /* last branch records */
> ftcprint (features1, 28, "flush_l1d"); /* flush l1d cache */
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