lkml.org 
[lkml]   [2018]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH RFC 1/3] x86/kvm/vmx: read MSR_FS_BASE from current->thread
On Fri, Mar 2, 2018 at 10:55 AM, Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
> vmx_save_host_state() is only called from kvm_arch_vcpu_ioctl_run() so
> the context is pretty well defined
>

True.

> and MSR_FS_BASE should always be
> equal to current->thread.fsbase.

Not true. current->thread.fsbase is almost entirely undefined in this
context. What you *could* do is export save_fsgs() and call it first.
When FSGSBASE support lands (which will happen eventually!), the code
in your patch will be completely wrong.

Admittedly, your patch isn't 100% bogus, but the reason is subtle and
you need lots of comments there *and* in save_fsgs().

\
 
 \ /
  Last update: 2018-03-02 21:19    [W:0.513 / U:0.608 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site