Hi Marc,
>
> On 08/09/17 10:05, gengdongjiu wrote:
> > Marc,
> >Thanks for reply.
> >
> > On 2017/9/8 16:21, Marc Zyngier wrote:
> >>> Marc,
> >>>
> >>> sorry I have another question for the PAN.
[...]
> There cannot be any userspace mapping at EL2 when non-VHE, so there cannot be
> any vali
On 08/09/17 10:05, gengdongjiu wrote:
> Marc,
>Thanks for reply.
>
> On 2017/9/8 16:21, Marc Zyngier wrote:
>>> Marc,
>>>
>>> sorry I have another question for the PAN.
>>>
>>> In the non-VHE mode, The host kernel is running in the EL1. Before
>>> host kernel enter guest, host OS will call 'HV
Marc,
Thanks for reply.
On 2017/9/8 16:21, Marc Zyngier wrote:
>> Marc,
>>
>> sorry I have another question for the PAN.
>>
>> In the non-VHE mode, The host kernel is running in the EL1. Before
>> host kernel enter guest, host OS will call 'HVC' instruction to do
>> the world-switch, and the ps
On Fri, 8 Sep 2017 15:19:21 +0800
gengdongjiu wrote:
> On 2017/9/7 23:23, Marc Zyngier wrote:
> > On 07/09/17 16:03, gengdongjiu wrote:
> >>> On 07/09/17 12:49, gengdongjiu wrote:
>
> [...]
>
> >
> > I really cannot think of a good reason why we'd want to do that. Playing
> > with se
On 2017/9/7 23:23, Marc Zyngier wrote:
> On 07/09/17 16:03, gengdongjiu wrote:
>>> On 07/09/17 12:49, gengdongjiu wrote:
[...]
>
> I really cannot think of a good reason why we'd want to do that. Playing
> with set_fs() is almost universally wrong, and I'm certainly going to
> oppose to an
On 07/09/17 16:03, gengdongjiu wrote:
>> On 07/09/17 12:49, gengdongjiu wrote:
>>>
>>>
>>> On 2017/9/7 18:13, Marc Zyngier wrote:
On 07/09/17 11:05, gengdongjiu wrote:
> Hi James,
>
> On 2017/9/7 17:20, James Morse wrote:
>> Hi Dongjiu Geng,
>>
>> On 07/09/17 06:54, Don
> On 07/09/17 12:49, gengdongjiu wrote:
> >
> >
> > On 2017/9/7 18:13, Marc Zyngier wrote:
> >> On 07/09/17 11:05, gengdongjiu wrote:
> >>> Hi James,
> >>>
> >>> On 2017/9/7 17:20, James Morse wrote:
> Hi Dongjiu Geng,
>
> On 07/09/17 06:54, Dongjiu Geng wrote:
> > In VHE mode, h
On 07/09/17 12:49, gengdongjiu wrote:
>
>
> On 2017/9/7 18:13, Marc Zyngier wrote:
>> On 07/09/17 11:05, gengdongjiu wrote:
>>> Hi James,
>>>
>>> On 2017/9/7 17:20, James Morse wrote:
Hi Dongjiu Geng,
On 07/09/17 06:54, Dongjiu Geng wrote:
> In VHE mode, host kernel runs in the
On 2017/9/7 18:13, Marc Zyngier wrote:
> On 07/09/17 11:05, gengdongjiu wrote:
>> Hi James,
>>
>> On 2017/9/7 17:20, James Morse wrote:
>>> Hi Dongjiu Geng,
>>>
>>> On 07/09/17 06:54, Dongjiu Geng wrote:
In VHE mode, host kernel runs in the EL2 and can enable
'User Access Override' when
On 07/09/17 11:05, gengdongjiu wrote:
> Hi James,
>
> On 2017/9/7 17:20, James Morse wrote:
>> Hi Dongjiu Geng,
>>
>> On 07/09/17 06:54, Dongjiu Geng wrote:
>>> In VHE mode, host kernel runs in the EL2 and can enable
>>> 'User Access Override' when fs==KERNEL_DS so that it can
>>> access kernel me
Hi James,
On 2017/9/7 17:20, James Morse wrote:
> Hi Dongjiu Geng,
>
> On 07/09/17 06:54, Dongjiu Geng wrote:
>> In VHE mode, host kernel runs in the EL2 and can enable
>> 'User Access Override' when fs==KERNEL_DS so that it can
>> access kernel memory. However, PSTATE.UAO is set to 0 on
>> an ex
Hi Dongjiu Geng,
On 07/09/17 06:54, Dongjiu Geng wrote:
> In VHE mode, host kernel runs in the EL2 and can enable
> 'User Access Override' when fs==KERNEL_DS so that it can
> access kernel memory. However, PSTATE.UAO is set to 0 on
> an exception taken from EL1 to EL2. Thus when VHE is used
> and
In VHE mode, host kernel runs in the EL2 and can enable
'User Access Override' when fs==KERNEL_DS so that it can
access kernel memory. However, PSTATE.UAO is set to 0 on
an exception taken from EL1 to EL2. Thus when VHE is used
and exception taken from a guest UAO will be disabled and
host will use
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