Re: PATCH: setup_vmcs_config: disable TSC scaling on unlike processors

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Am 02.12.2016 um 16:07 schrieb Radim Krčmář:
Subjects that touch only arch/x86/kvm/vmx.c are usually prefixed with
"[PATCH] KVM: VMX:".

2016-12-01 21:32-0500, Don Bowman:
Add an enable_tsc_scaling parameter to kvm

Signed-off-by: Don Bowman <db@xxxxxxxxxxxx>
---

My system has what i thought were two identical processors (same
stepping ID etc).
However, bafflingly, one of them has the ability to do TSC scaling,
and one does not (as reported in the vmcs).

Wow, the chip doesn't sound trustworthy.

This in turn causes kvm to give up entirely.

I feel a better solution is to mask off this capability on the one processor.

I like the global toggle better -- it is less code with more uses.

(not having much insight) what speaks against allowing such features only if available on all CPUs symmetrically? I actually prefer having an automatism to some magic toggle.

--

David
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