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SubjectRe: [PATCH v3 7/7] x86/kvm: use Enlightened VMCS when running on Hyper-V
2018-03-12 15:19+0100, Vitaly Kuznetsov:
> Thomas Gleixner <tglx@linutronix.de> writes:
>
> > On Fri, 9 Mar 2018, Vitaly Kuznetsov wrote:
> >
> >> Enlightened VMCS is just a structure in memory, the main benefit
> >> besides avoiding somewhat slower VMREAD/VMWRITE is using clean field
> >> mask: we tell the underlying hypervisor which fields were modified
> >> since VMEXIT so there's no need to inspect them all.
> >>
> >> Tight CPUID loop test shows significant speedup:
> >> Before: 18890 cycles
> >> After: 8304 cycles
> >>
> >> Static key is being used to avoid performance penalty for non-Hyper-V
> >> deployments. Tests show we add around 3 (three) CPU cycles on each
> >> VMEXIT (1077.5 cycles before, 1080.7 cycles after for the same CPUID
> >> loop on bare metal). We can probably avoid one test/jmp in vmx_vcpu_run()
> >> but I don't see a clean way to use static key in assembly.
> >
> > STATIC_JUMP_IF_TRUE, STATIC_JUMP_IF_FALSE are your friends.
> >
>
> Thanks for the tip,
>
> with a single kernel user of these APIs it was easy to miss :-)

Indeed, I had no idea.

> Unfortunately, these APIs are only present if HAVE_JUMP_LABEL and
> (afaiu) we still care about KVM on !HAVE_JUMP_LABEL builds. It would be
> nice if we can make them behave the same way static_branch_likely() and
> friends do: compile into something else when !HAVE_JUMP_LABEL so we can
> avoid nasty #ifdefs in C code.
>
> That said I'd like to defer the question to KVM maintainers: Paolo,
> Radim, what would you like me to do? Use STATIC_JUMP_IF_TRUE/FALSE as
> they are, try to make them work for !HAVE_JUMP_LABEL and use them or
> maybe we can commit the series as-is and have it as a future
> optimization (e.g. when HAVE_JUMP_LABEL becomes mandatory)?

Please take a look into making a macro that uses STATIC_JUMP_IF_FALSE or
reads the value from provided static_key and does a test-jump, depending
on HAVE_JUMP_LABEL.
It doesn't need to be suited for general use, just something that moves
the ugliness away from vmx_vcpu_run.
(Although having it in jump_label.h would be great. I think the main
obstacle is clobbering of flags.)

If it were still looking horrible, I'm ok with the series as-is,

thanks.

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