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kvm: set MSR_IA32_SPEC_CTRL to the host value #10805

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kvm: set MSR_IA32_SPEC_CTRL to the host value #10805

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Commits on Aug 22, 2024

  1. kvm: set MSR_IA32_SPEC_CTRL to the host value 

    Otherwise, the kernel needs to save/restore the value of this msr on
each vmexit/vmenter.

Here are kvm benchmark results:
goarch: amd64
cpu: 11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz
Before:
BenchmarkWorldSwitchToUserRoundtrip-8   	 1605484	      3644 ns/op
After:
BenchmarkWorldSwitchToUserRoundtrip-8   	 1812069	      3255 ns/op

Signed-off-by: Andrei Vagin <[email protected]>
    @avagin
    avagin committed Aug 22, 2024
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