linux-kernel - Re: [PATCH] x86: fix rdmsr MSR_PLATFORM

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Message-ID: <CANRm+Czi7L_J8Mh0OZ=EuMubYRYe8OggyKxQL3TckzmChbzzgw@mail.gmail.com>
Date:	Thu, 23 Jun 2016 15:34:56 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	linux-acpi@...r.kernel.org, lkp@...org, x86@...nel.org,
	Wanpeng Li <wanpeng.li@...mail.com>,
	Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Zhang Rui <rui.zhang@...el.com>, Chen Yu <y.c.chen@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>,
	jacob.jun.pan@...el.com, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: fix rdmsr MSR_PLATFORM_INFO unsafe warning in kvm guest

Hi Jacob,
2016-06-23 15:28 GMT+08:00 Wanpeng Li <kernellwp@...il.com>:
> 2016-06-23 15:09 GMT+08:00 Thomas Gleixner <tglx@...utronix.de>:
>> On Wed, 22 Jun 2016, Wanpeng Li wrote:
>>> After commit (fc141535ad8 : "x86 tsc_msr: Extend to include Intel Core
>>
>> Where did you find that commit? It's neither in Linus tree nor in tip.
>
> It is reported by lkp. https://lkml.org/lkml/2016/6/20/110 The patch
> is against x86 branch on Len Brown's tree. And try to fix this commit:
> https://git.kernel.org/cgit/linux/kernel/git/lenb/linux.git/commit/?h=x86&id=fc141535ad8a67fd58623289c04e35465e2a07f2

I prefer this patch can be applied separately instead of fold into the
bad commit since it shows the issue when access MSR_PLATFORM_INFO in
kvm guest and other guys who want to access MSR_PLATFORM_INFO later
can find the changelog and make better decisions.

Regards,
Wanpeng Li