lkml.org 
[lkml]   [2017]   [Sep]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits
From
Date


On 2017/9/6 20:00, Vladimir Murzin wrote:
> On 06/09/17 11:35, gengdongjiu wrote:
>> Vladimir,
>>
>> On 2017/9/6 17:41, Vladimir Murzin wrote:
>>> Can you please elaborate on cases where PAN is not enabled?
>>
>> I mean the informal private usage, For example, he disabled the PAN dynamically to let kernel space to access the user space.
>> After he dynamic disabled the PAN, then switched to guest OS. after return to host. he found the PAN stage is modified.
>> Of cause this is not a formal usage, in our host kernel, it is always enabled, no dynamic change, but I means it may exist such cases.
>>
>>
>
> So, in short, there is no real issue with PAN, right? What about UAO?
For the PAN, if host OS dynamically enable/disable PAN should have issue.
Do you think that is not a issue as above description?

"host OS dynamically disable the PAN, but after go back from the guest OS, The PAN is unexpectedly enabled"

>
> Cheers
> Vladimir
>
> .
>

\
 
 \ /
  Last update: 2017-09-06 14:16    [W:0.051 / U:4.916 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site