Messages in this thread | | | Date | Thu, 14 Jul 2022 19:00:05 -0700 | From | Pawan Gupta <> | Subject | Re: [PATCH v2] x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts |
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On Thu, Jul 14, 2022 at 09:11:18PM -0300, Thadeu Lima de Souza Cascardo wrote: >On Thu, Jul 14, 2022 at 04:15:35PM -0700, Pawan Gupta wrote: >> IBRS mitigation for spectre_v2 forces write to MSR_IA32_SPEC_CTRL at >> every kernel entry/exit. On Enhanced IBRS parts setting >> MSR_IA32_SPEC_CTRL[IBRS] only once at boot is sufficient. MSR writes at >> every kernel entry/exit incur unnecessary performance loss. >> >> When Enhanced IBRS feature is present, print a warning about this >> unnecessary performance loss. >> >> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> > >Reviewed-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Thanks for the review.
Pawan
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