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

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Message-ID: <150f6a8d-33e8-a84d-f34b-17bdb7264ebe@oracle.com>
Date:   Sun, 12 Aug 2018 09:26:58 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, Pu Wen <puwen@...on.cn>,
        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 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