Messages in this thread |  | | Subject | Re: [PATCH] Allow RDTSC and RDTSCP from userspace | From | Tom Lendacky <> | Date | Fri, 24 Apr 2020 16:27:32 -0500 |
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On 4/24/20 4:24 PM, Dave Hansen wrote: > On 4/24/20 2:03 PM, Mike Stunes wrote: >> I needed to allow RDTSC(P) from userspace and in early boot in order to >> get userspace started properly. Patch below. >> >> --- >> SEV-ES guests will need to execute rdtsc and rdtscp from userspace and >> during early boot. Move the rdtsc(p) #VC handler into common code and >> extend the #VC handlers. > > Do SEV-ES guests _always_ #VC on rdtsc(p)?
Only if the hypervisor is intercepting those instructions.
Thanks, Tom
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