From: Borislav Petkov <bp@alien8.de>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround in a hypervisor
Date: Wed, 12 Jul 2017 15:47:06 +0200 [thread overview]
Message-ID: <20170712134706.GA20584@nazgul.tnic> (raw)
In-Reply-To: <alpine.LRH.2.02.1707120318530.4739@file01.intranet.prod.int.rdu2.redhat.com>
On Wed, Jul 12, 2017 at 03:19:56AM -0400, Mikulas Patocka wrote:
> When I start a virtual machine, kvm complains about accesses to an unknown
> MSR ("vcpu0 unhandled rdmsr: 0xc001100d"). This is caused by the code in
> init_amd_k8 that tries to work around a BIOS bug that incorrectly sets
> lahf_lm.
No need - there are a lot of qemu configurations which cause the
unhandled MSR warning so no need to pollute the kernel unnecessarily.
The warning is harmless at that.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
--
next prev parent reply other threads:[~2017-07-12 13:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-12 7:19 Mikulas Patocka
2017-07-12 13:47 ` Borislav Petkov [this message]
2017-07-13 2:27 ` Mikulas Patocka
2017-07-13 6:32 ` Borislav Petkov
2017-07-21 11:34 ` Mikulas Patocka
2017-07-21 12:28 ` Borislav Petkov
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