Re: [PATCH] kvm: x86: emulate MSR_PLATFORM_INFO msr bits

[Chao Gao]

On Mon, Aug 21, 2023 at 11:26:32AM +0800, Hao Xiang wrote:
>For intel platform, The BzyMhz field of Turbostat shows zero
>due to the missing of part msr bits of MSR_PLATFORM_INFO.
>
>Acquire necessary msr bits, and expose following msr info to guest,
>to make sure guest can get correct turbo frequency info.

Userspace VMM (e.g., QEMU) can configure this MSR for guests. Please refer to
tools/testing/selftests/kvm/x86_64/platform_info_test.c.

The question is why KVM needs this patch given KVM already provides interfaces
for QEMU to configure the MSR.