kvm: set MSR_IA32_SPEC_CTRL to the host value #10805
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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]>
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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: Before: BenchmarkWorldSwitchToUserRoundtrip-8 1605484 3644 ns/op After: BenchmarkWorldSwitchToUserRoundtrip-8 1812069 3255 ns/op FUTURE_COPYBARA_INTEGRATE_REVIEW=#10805 from avagin:kvm-msr-spec-ctrl 7e9a33a PiperOrigin-RevId: 666429086
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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: Before: BenchmarkWorldSwitchToUserRoundtrip-8 1605484 3644 ns/op After: BenchmarkWorldSwitchToUserRoundtrip-8 1812069 3255 ns/op FUTURE_COPYBARA_INTEGRATE_REVIEW=#10805 from avagin:kvm-msr-spec-ctrl 7e9a33a PiperOrigin-RevId: 666429086
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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: Before: BenchmarkWorldSwitchToUserRoundtrip-8 1605484 3644 ns/op After: BenchmarkWorldSwitchToUserRoundtrip-8 1812069 3255 ns/op FUTURE_COPYBARA_INTEGRATE_REVIEW=#10805 from avagin:kvm-msr-spec-ctrl 7e9a33a PiperOrigin-RevId: 666429086
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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: Before: BenchmarkWorldSwitchToUserRoundtrip-8 1605484 3644 ns/op After: BenchmarkWorldSwitchToUserRoundtrip-8 1812069 3255 ns/op FUTURE_COPYBARA_INTEGRATE_REVIEW=#10805 from avagin:kvm-msr-spec-ctrl 7e9a33a PiperOrigin-RevId: 666429086
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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 1394972 4103 ns/op
After:
BenchmarkWorldSwitchToUserRoundtrip-8 1528820 3770 ns/op