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Re: [Xen-devel] [PATCH v3 13/17] x86/xen: enable Hygon support to Xen


  • To: Juergen Gross <jgross@xxxxxxxx>, Pu Wen <puwen@xxxxxxxx>, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, x86@xxxxxxxxxx, thomas.lendacky@xxxxxxx, bp@xxxxxxxxx, pbonzini@xxxxxxxxxx, JBeulich@xxxxxxxx
  • From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
  • Date: Sun, 12 Aug 2018 09:26:58 -0400
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  • Cc: linux-arch@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
  • Delivery-date: Sun, 12 Aug 2018 13:27:36 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 08/12/2018 04:55 AM, Juergen Gross wrote:
> On 11/08/18 16:34, Boris Ostrovsky wrote:
>> On 08/11/2018 09:29 AM, Pu Wen wrote:
>>
>>>  
>>>  bool pmu_msr_read(unsigned int msr, uint64_t *val, int *err)
>>>  {
>>> -   if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
>>> +   if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
>>> +       boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
>>
>> 'if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)' please.
> Really? Xen supports Centaur, too.

VPMU doesn't --- hypervisor will not initialize it. Besides, the
existing code will steer non-AMD execution to Intel, which is not right
either.

I'll add a check to bail if VPMU is not initialized properly, we seem to
ignore xen_pmu_init() failures. Which, BTW, makes this patch rather
pointless until there is support for Hygon Xen.

-boris

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