[SeaBIOS] [PATCH v3] fw/msr_feature_control: add support to set MSR_IA32_FEATURE_CONTROL
pbonzini at redhat.com
Wed Jul 6 08:18:04 CEST 2016
> I forgot to restore MSR_IA32_FEATURE_CONTROL in the resume path, and
> MSR_IA32_FEATURE_CONTROL is zero after S3 resume.
This is a bug. Sorry Laszlo. :)
> Not restore MSR_IA32_FEATURE_CONTROL during S3 resume does not affect
> at least Linux guest (tested 4.5). Current QEMU may advise the guest
> firmware to set bit 20 (for LMCE), bit 2 (for VMX) and bit 0 (lock
> - For LMCE, Linux only checks bit 20 and bit 0 at boot time and then
> keeps using the result even after resume.
On real hardware, LMCE would not be enabled after resume. I'm not
sure what would happen, but it wouldn't be good.
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