From: Ingo Molnar <mingo@kernel.org>
To: Wanpeng Li <kernellwp@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
kvm <kvm@vger.kernel.org>,
"Linux PM list" <linux-pm@vger.kernel.org>,
linux-acpi@vger.kernel.org, lkp@01.org,
"the arch/x86 maintainers" <x86@kernel.org>,
"Wanpeng Li" <wanpeng.li@hotmail.com>,
"Len Brown" <len.brown@intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"Zhang Rui" <rui.zhang@intel.com>,
"Chen Yu" <yu.c.chen@intel.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Jacob Pan" <jacob.jun.pan@intel.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86: fix rdmsr MSR_PLATFORM_INFO unsafe warning in kvm guest
Date: Mon, 11 Jul 2016 09:38:37 +0200 [thread overview]
Message-ID: <20160711073837.GA25250@gmail.com> (raw)
In-Reply-To: <CANRm+CzKhfyUFGDUJcVYryv3=ORPQ4AG4jbY2eP7NvkLK=Wg2g@mail.gmail.com>
* Wanpeng Li <kernellwp@gmail.com> wrote:
> Hi Ingo, Thomas,
> 2016-06-22 9:28 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>:
> > From: Wanpeng Li <wanpeng.li@hotmail.com>
> >
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 0 at arch/x86/mm/extable.c:50 ex_handler_rdmsr_unsafe+0x6a/0x70
> > unchecked MSR access error: RDMSR from 0xce
> > Modules linked in:
> > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3+ #1
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > 0000000000000000 ffffffff81c03ce0 ffffffff813b3eae ffffffff81c03d30
> > 0000000000000000 ffffffff81c03d20 ffffffff81067181 0000003200000001
> > ffffffff81c03df8 ffffffff8179676c 0000000000000000 ffffffff81fcd2c0
> > Call Trace:
> > dump_stack+0x67/0x99
> > __warn+0xd1/0xf0
> > warn_slowpath_fmt+0x4f/0x60
> > ex_handler_rdmsr_unsafe+0x6a/0x70
> > fixup_exception+0x39/0x50
> > do_general_protection+0x93/0x1b0
> > general_protection+0x22/0x30
> > ? cpu_khz_from_msr+0xd8/0x1c0
> > native_calibrate_cpu+0x30/0x5b0
> > tsc_init+0x2b/0x297
> > x86_late_time_init+0xf/0x11
> > start_kernel+0x398/0x451
> > ? set_init_arg+0x55/0x55
> > x86_64_start_reservations+0x2f/0x31
> > x86_64_start_kernel+0xea/0xed
> >
> > After commit (fc141535ad8 : "x86 tsc_msr: Extend to include Intel Core
> > Architecture"), rdmsr MSR_PLATFORM_INFO is used to get maximum non-turbo
>
> I just saw commit (fc273eeef314c : "x86 tsc_msr: Extend to include
> Intel Core Architecture") was merged in tip tree, then this patch is
> needed to fix that commit. The bug is reported by LKP several weeks
> ago, and kvm maintainer Paolo has already replied "This looks good" to
> this patch.
Applied, thanks!
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: lkp@lists.01.org
Subject: Re: [PATCH] x86: fix rdmsr MSR_PLATFORM_INFO unsafe warning in kvm guest
Date: Mon, 11 Jul 2016 09:38:37 +0200 [thread overview]
Message-ID: <20160711073837.GA25250@gmail.com> (raw)
In-Reply-To: <CANRm+CzKhfyUFGDUJcVYryv3=ORPQ4AG4jbY2eP7NvkLK=Wg2g@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1767 bytes --]
* Wanpeng Li <kernellwp@gmail.com> wrote:
> Hi Ingo, Thomas,
> 2016-06-22 9:28 GMT+08:00 Wanpeng Li <kernellwp@gmail.com>:
> > From: Wanpeng Li <wanpeng.li@hotmail.com>
> >
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 0 at arch/x86/mm/extable.c:50 ex_handler_rdmsr_unsafe+0x6a/0x70
> > unchecked MSR access error: RDMSR from 0xce
> > Modules linked in:
> > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.7.0-rc3+ #1
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> > 0000000000000000 ffffffff81c03ce0 ffffffff813b3eae ffffffff81c03d30
> > 0000000000000000 ffffffff81c03d20 ffffffff81067181 0000003200000001
> > ffffffff81c03df8 ffffffff8179676c 0000000000000000 ffffffff81fcd2c0
> > Call Trace:
> > dump_stack+0x67/0x99
> > __warn+0xd1/0xf0
> > warn_slowpath_fmt+0x4f/0x60
> > ex_handler_rdmsr_unsafe+0x6a/0x70
> > fixup_exception+0x39/0x50
> > do_general_protection+0x93/0x1b0
> > general_protection+0x22/0x30
> > ? cpu_khz_from_msr+0xd8/0x1c0
> > native_calibrate_cpu+0x30/0x5b0
> > tsc_init+0x2b/0x297
> > x86_late_time_init+0xf/0x11
> > start_kernel+0x398/0x451
> > ? set_init_arg+0x55/0x55
> > x86_64_start_reservations+0x2f/0x31
> > x86_64_start_kernel+0xea/0xed
> >
> > After commit (fc141535ad8 : "x86 tsc_msr: Extend to include Intel Core
> > Architecture"), rdmsr MSR_PLATFORM_INFO is used to get maximum non-turbo
>
> I just saw commit (fc273eeef314c : "x86 tsc_msr: Extend to include
> Intel Core Architecture") was merged in tip tree, then this patch is
> needed to fix that commit. The bug is reported by LKP several weeks
> ago, and kvm maintainer Paolo has already replied "This looks good" to
> this patch.
Applied, thanks!
Ingo
next prev parent reply other threads:[~2016-07-11 7:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-22 1:28 [PATCH] x86: fix rdmsr MSR_PLATFORM_INFO unsafe warning in kvm guest Wanpeng Li
2016-06-22 17:43 ` Paolo Bonzini
2016-06-22 17:43 ` Paolo Bonzini
2016-06-23 7:09 ` Thomas Gleixner
2016-06-23 7:09 ` Thomas Gleixner
2016-06-23 7:28 ` Wanpeng Li
2016-06-23 7:34 ` Wanpeng Li
2016-06-23 7:37 ` [LKP] " Yu Chen
2016-06-23 7:37 ` Yu Chen
2016-06-23 7:41 ` [LKP] " Wanpeng Li
2016-06-23 7:41 ` Wanpeng Li
2016-06-23 8:00 ` Wanpeng Li
2016-07-11 2:38 ` Wanpeng Li
2016-07-11 7:38 ` Ingo Molnar [this message]
2016-07-11 7:38 ` Ingo Molnar
2016-07-11 7:40 ` [tip:x86/timers] x86/tsc_msr: Fix rdmsr(MSR_PLATFORM_INFO) unsafe warning in KVM guest tip-bot for Wanpeng Li
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