linux-kernel - Re: [Xen-devel] [PATCH v4 12/16] x86/xen: enable Hygon support to Xen

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Date:   Mon, 20 Aug 2018 21:43:43 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     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, jgross@...e.com,
        JBeulich@...e.com
Cc:     linux-arch@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v4 12/16] x86/xen: enable Hygon support to Xen

On 08/19/2018 12:13 PM, Pu Wen wrote:
> To make Xen works functionly on Hygon platforms, reuse AMD's Xen support
> code path for Hygon.
>
> There are six core performance events counters per thread, so there are
> six MSRs for these counters(0-5). Also there are four legacy PMC MSRs,
> they are alias of the counters(0-3).
>
> In this version of kernel Hygon use the lagacy and safe versions of MSR
> access. It works fine when VPMU enabled in Xen on Hygon platforms by
> testing with perf.
>
> Signed-off-by: Pu Wen <puwen@...on.cn>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>