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Re: [Xen-devel] [PATCH 2/2 v2] x86/acpi: Improve suspend and resume process for Zhaoxin CPU
- To: Jan Beulich <JBeulich@xxxxxxxx>, FionaLi-oc <fionali-oc@xxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 25 Apr 2019 14:42:15 +0100
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, cobechen@xxxxxxxxxxx, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 25 Apr 2019 13:42:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 25/04/2019 14:37, Jan Beulich wrote:
>>>> On 25.04.19 at 15:25, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 25/04/2019 14:21, Jan Beulich wrote:
>>>>>> On 19.04.19 at 10:50, <fionali-oc@xxxxxxxxxxx> wrote:
>>>> --- a/xen/arch/x86/x86_64/traps.c
>>>> +++ b/xen/arch/x86/x86_64/traps.c
>>>> @@ -334,7 +334,8 @@ void subarch_percpu_traps_init(void)
>>>> (unsigned long)lstar_enter);
>>>> stub_va += offset;
>>>>
>>>> - if ( boot_cpu_data.x86_vendor & (X86_VENDOR_INTEL |
>>>> X86_VENDOR_CENTAUR)
>> )
>>>> + if ( boot_cpu_data.x86_vendor &
>>>> + (X86_VENDOR_INTEL | X86_VENDOR_CENTAUR | X86_VENDOR_SHANGHAI) )
>>>> {
>>>> /* SYSENTER entry. */
>>>> wrmsrl(MSR_IA32_SYSENTER_ESP, stack_bottom);
>>> How is this hunk related to the title of the change? I think the
>>> title wants to be adjusted.
>>>
>>> Furthermore for all of the changes done, wouldn't we better
>>> switch to use cpu_has_sep? init_amd() as well as default_init()
>>> already clear this flag. Andrew, thoughts?
>> I wondered exactly that after queuing this patch, but didn't get around
>> to experimenting.
>>
>> We have to be a little careful with the ordering of operations.
>> cpu_has_sep is visible in CPUID but needs clobbering in AMD/Hygon before
>> cpu_has_sep is safe to use (although for the MSRs, it should be safe).
> trap_init() (and hence percpu_traps_init()) runs after, in
> particular, init_speculation_mitigations(), which means all
> feature collection and massaging must have happened. So
> unless you explicitly say otherwise, I'd like to ask FionaLi
> to submit a v2 with that change (and with the other cosmetic
> adjustments carried out).
I'll drop this patch from x86-next. Overall, I think a cpu_has_sep
based solution would be preferable.
~Andrew
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