[lkml]   [2020]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [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.



 \ /
  Last update: 2020-04-24 23:28    [W:0.078 / U:38.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site