lkml.org 
[lkml]   [2018]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v6 06/13] KVM: nVMX: optimize prepare_vmcs02{,_full} for Enlightened VMCS case
Date
Paolo Bonzini <pbonzini@redhat.com> writes:

> On 17/10/2018 19:08, Jim Mattson wrote:
>> I believe that ESXi reads GUEST_CS_AR_BYTES on every VM-exit to
>> determine code size.
>
> Which makes me wonder, maybe we should add GUEST_SS_AR_BYTES which is
> where the CPL lives. But then your tests from last year didn't find it.
>

Hyper-V does read GUEST_SS_AR_BYTES. Way less frequent than
GUEST_CS_AR_BYTES but still.

Based on that my suggestion would be to shadow GUEST_SS_AR_BYTES, keep
GUEST_SS_AR_BYTES and unshadow the rest (GUEST_ES_BASE,
GUEST_CS_SELECTOR, GUEST_CS_LIMIT, GUEST_CS_BASE). I can do this as a
separate patch as I see this series is already in kvm/queue.

--
Vitaly

\
 
 \ /
  Last update: 2018-10-18 13:15    [W:0.061 / U:0.676 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site