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Date: Fri, 24 Apr 2020 16:27:32 -0500 From: Tom Lendacky <thomas.lendacky@....com> To: Dave Hansen <dave.hansen@...el.com>, Mike Stunes <mstunes@...are.com>, joro@...tes.org Cc: dan.j.williams@...el.com, dave.hansen@...ux.intel.com, hpa@...or.com, jgross@...e.com, jroedel@...e.de, jslaby@...e.cz, keescook@...omium.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, luto@...nel.org, peterz@...radead.org, thellstrom@...are.com, virtualization@...ts.linux-foundation.org, x86@...nel.org, Sean Christopherson <sean.j.christopherson@...el.com> Subject: Re: [PATCH] Allow RDTSC and RDTSCP from userspace 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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