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

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Date:   Thu, 16 Aug 2018 21:29:13 +0800
From:   Pu Wen <puwen@...on.cn>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        thomas.lendacky@....com, bp@...en8.de, pbonzini@...hat.com,
        JBeulich@...e.com
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 13/17] x86/xen: enable Hygon support to Xen

On 2018/8/12 21:26, Boris Ostrovsky wrote:
> 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.

So should it still need to test vendor Hygon here or wait for your check
done?

Thanks,
Pu Wen