Messages in this thread | | | Subject | Re: [RESEND] Atomic switch of MSR_IA32_UMWAIT_CONTROL | From | Paolo Bonzini <> | Date | Thu, 23 Jan 2020 17:16:06 +0100 |
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On 23/01/20 16:45, Sean Christopherson wrote: > cc'ing KVM and LKML this time... > > Why does KVM use the atomic load/store lists to load MSR_IA32_UMWAIT_CONTROL > on VM-Enter/VM-Exit? Unless the host kernel is doing UWMAIT, which it > really shouldn't and AFAICT doesn't, isn't it better to use the shared MSR > mechanism to load the host value only when returning to userspace, and > reload the guest value on demand?
Just laziness I guess.
Paolo
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