linux-kernel - Re: [PATCH RFC 0/2] ignore LBR-related MSRs

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Message-ID: <f8c43c8b-1139-a0b6-2a0b-6c78c63c381c@virtuozzo.com>
Date:   Wed, 6 Dec 2017 19:45:54 +0300
From:   "Denis V. Lunev" <den@...tuozzo.com>
To:     Jan Dakinevich <jan.dakinevich@...tuozzo.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     linux-kernel@...r.kernel.org, Roman Kagan <rkagan@...tuozzo.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Colin King <colin.king@...onical.com>,
        Stephane Eranian <eranian@...gle.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jin Yao <yao.jin@...ux.intel.com>, kvm@...r.kernel.org
Subject: Re: [PATCH RFC 0/2] ignore LBR-related MSRs

On 12/06/2017 07:39 PM, Jan Dakinevich wrote:
> On Wed, 6 Dec 2017 10:06:48 -0500
> Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
>
>> On Wed, Dec 06, 2017 at 02:43:01PM +0300, Jan Dakinevich wrote:
>>> w2k16 essentials fails to boot if underlying hypervisor lacks of
>>> support for LBR MSRs. To workaround the issue, it suggessted to
>>> ignore these MSRs (but not all).
>> This is without any hyperv enablement? Meaning normal stock guest?
>>
> Yes, it is normal guest. No hyperv enlightenments were enabled, and
> "-cpu host" was specified in QEMU command line.

The problem also exists with HyperV enabled.

Den