On Mon, Jun 4, 2018 at 10:36 PM H. Peter Anvin wrote:
>
> On 06/04/18 20:57, Mika Penttilä wrote:
> >
> > This won't work on X86-32 because it actually uses the segment limit with
> > fs: access. So there
> > is a reason why the lsl based method is X86-64 only.
> >
>
>
>
> Why does that matter i
On 06/05/2018 08:36 AM, H. Peter Anvin wrote:
> On 06/04/18 20:57, Mika Penttilä wrote:
>>
>> This won't work on X86-32 because it actually uses the segment limit with
>> fs: access. So there
>> is a reason why the lsl based method is X86-64 only.
>>
>
>
>
> Why does that matter in any shape,
On 06/04/18 20:57, Mika Penttilä wrote:
>
> This won't work on X86-32 because it actually uses the segment limit with fs:
> access. So there
> is a reason why the lsl based method is X86-64 only.
>
Why does that matter in any shape, way, or form? The LSL instruction
doesn't touch any of the
On 06/05/2018 07:44 AM, Bae, Chang Seok wrote:
>>> diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
>>> index ea554f8..e716e94 100644
>>> --- a/arch/x86/kernel/setup_percpu.c
>>> +++ b/arch/x86/kernel/setup_percpu.c
>>> @@ -155,12 +155,21 @@ static void __init pcpup_popu
>> diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
>> index ea554f8..e716e94 100644
>> --- a/arch/x86/kernel/setup_percpu.c
>> +++ b/arch/x86/kernel/setup_percpu.c
>> @@ -155,12 +155,21 @@ static void __init pcpup_populate_pte(unsigned long
>> addr)
>>
>> static inl
On 06/04/2018 10:24 PM, Chang S. Bae wrote:
> The CPU (and node) number will be written, as early enough,
> to the segment limit of per CPU data and TSC_AUX MSR entry.
> The information has been retrieved by vgetcpu in user space
> and will be also loaded from the paranoid entry, when
> FSGSBASE en
The CPU (and node) number will be written, as early enough,
to the segment limit of per CPU data and TSC_AUX MSR entry.
The information has been retrieved by vgetcpu in user space
and will be also loaded from the paranoid entry, when
FSGSBASE enabled. So, it is moved out from vDSO to the CPU
initia
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