Re: [PATCH] x86/kernel/cpu/amd.c: don't apply the lahf_lm workaround in a hypervisor

[Borislav Petkov]

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.
--