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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
Cc: linux-kernel@vger.kernel.org,
	"Denis V . Lunev" <den@virtuozzo.com>,
	"Roman Kagan" <rkagan@virtuozzo.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
	"Jiri Olsa" <jolsa@redhat.com>,
	"Namhyung Kim" <namhyung@kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Andi Kleen" <ak@linux.intel.com>,
	"Kan Liang" <kan.liang@intel.com>,
	"Colin King" <colin.king@canonical.com>,
	"Stephane Eranian" <eranian@google.com>,
	"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Jin Yao" <yao.jin@linux.intel.com>,
	kvm@vger.kernel.org
Subject: Re: [PATCH RFC 0/2] ignore LBR-related MSRs
Date: Wed, 6 Dec 2017 10:06:48 -0500	[thread overview]
Message-ID: <20171206150648.GF28074@char.us.oracle.com> (raw)
In-Reply-To: <1512560585-27263-1-git-send-email-jan.dakinevich@virtuozzo.com>

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?

> 
> The information, which MSRs are supported for specific platform is taken from
> perf, it is the subject of the first patch. The second patch adds ignoring for
> these MSRs to pmu_intel code of KVM.
> 
> TODO: use MSR load/store areas to make full support of LBR debug.
> 
> Jan Dakinevich (2):
>   perf/x86/intel: make reusable LBR initialization code
>   KVM: x86/vPMU: ignore access to LBR-related MSRs
> 
>  arch/x86/events/core.c            |   8 +-
>  arch/x86/events/intel/core.c      |  59 +++------
>  arch/x86/events/intel/lbr.c       | 272 +++++++++++++++++++++++++-------------
>  arch/x86/events/perf_event.h      |  27 +---
>  arch/x86/include/asm/kvm_host.h   |   2 +
>  arch/x86/include/asm/perf_event.h |  11 ++
>  arch/x86/kvm/pmu_intel.c          |  33 +++++
>  7 files changed, 250 insertions(+), 162 deletions(-)
> 
> -- 
> 2.1.4
> 

WARNING: multiple messages have this Message-ID (diff)
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Jan Dakinevich <jan.dakinevich@virtuozzo.com>
Cc: linux-kernel@vger.kernel.org,
	"Denis V . Lunev" <den@virtuozzo.com>,
	"Roman Kagan" <rkagan@virtuozzo.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Arnaldo Carvalho de Melo" <acme@kernel.org>,
	"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
	"Jiri Olsa" <jolsa@redhat.com>,
	"Namhyung Kim" <namhyung@kernel.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Andi Kleen" <ak@linux.intel.com>,
	"Kan Liang" <kan.liang@intel.com>,
	"Colin King" <colin.king@canonical.com>,
	"Stephane Eranian" <eranian@google.com>,
	"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoun>
Subject: Re: [PATCH RFC 0/2] ignore LBR-related MSRs
Date: Wed, 6 Dec 2017 10:06:48 -0500	[thread overview]
Message-ID: <20171206150648.GF28074@char.us.oracle.com> (raw)
In-Reply-To: <1512560585-27263-1-git-send-email-jan.dakinevich@virtuozzo.com>

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?

> 
> The information, which MSRs are supported for specific platform is taken from
> perf, it is the subject of the first patch. The second patch adds ignoring for
> these MSRs to pmu_intel code of KVM.
> 
> TODO: use MSR load/store areas to make full support of LBR debug.
> 
> Jan Dakinevich (2):
>   perf/x86/intel: make reusable LBR initialization code
>   KVM: x86/vPMU: ignore access to LBR-related MSRs
> 
>  arch/x86/events/core.c            |   8 +-
>  arch/x86/events/intel/core.c      |  59 +++------
>  arch/x86/events/intel/lbr.c       | 272 +++++++++++++++++++++++++-------------
>  arch/x86/events/perf_event.h      |  27 +---
>  arch/x86/include/asm/kvm_host.h   |   2 +
>  arch/x86/include/asm/perf_event.h |  11 ++
>  arch/x86/kvm/pmu_intel.c          |  33 +++++
>  7 files changed, 250 insertions(+), 162 deletions(-)
> 
> -- 
> 2.1.4
> 

  parent reply	other threads:[~2017-12-06 15:07 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-06 11:43 [PATCH RFC 0/2] ignore LBR-related MSRs Jan Dakinevich
2017-12-06 11:43 ` Jan Dakinevich
2017-12-06 11:43 ` [PATCH RFC 1/2] perf/x86/intel: make reusable LBR initialization code Jan Dakinevich
2017-12-06 11:43   ` Jan Dakinevich
2017-12-06 12:51   ` Peter Zijlstra
2017-12-06 12:51     ` Peter Zijlstra
2017-12-06 11:43 ` [PATCH RFC 2/2] KVM: x86/vPMU: ignore access to LBR-related MSRs Jan Dakinevich
2017-12-06 11:43   ` Jan Dakinevich
2017-12-06 12:52   ` Peter Zijlstra
2017-12-06 15:57   ` Andi Kleen
2017-12-06 17:02     ` Jan Dakinevich
2017-12-06 17:55       ` Andi Kleen
2017-12-06 15:06 ` Konrad Rzeszutek Wilk [this message]
2017-12-06 15:06   ` [PATCH RFC 0/2] ignore " Konrad Rzeszutek Wilk
2017-12-06 16:39   ` Jan Dakinevich
2017-12-06 16:39     ` Jan Dakinevich
2017-12-06 16:45     ` Denis V. Lunev
2017-12-06 16:45       ` Denis V. Lunev
2017-12-06 16:23 ` Jiri Olsa
2017-12-06 16:23   ` Jiri Olsa
2017-12-20 16:26 ` Jan Dakinevich
2017-12-20 16:26   ` Jan Dakinevich

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