Re: [PATCH 1/3] x86/kvm/hyper-v: add reenlightenment MSRs support

2018-02-28 Thread Vitaly Kuznetsov
Roman Kagan writes: > On Wed, Feb 28, 2018 at 02:43:59PM +0100, Vitaly Kuznetsov wrote: >> Nested Hyper-V/Windows guest running on top of KVM will use TSC page >> clocksource in two cases: >> - L0 exposes invariant TSC (CPUID.8007H:EDX[8]). >> - L0 provides Hyper-V Reenlightenment support (CP

Re: [PATCH 1/3] x86/kvm/hyper-v: add reenlightenment MSRs support

2018-02-28 Thread Roman Kagan
On Wed, Feb 28, 2018 at 02:43:59PM +0100, Vitaly Kuznetsov wrote: > Nested Hyper-V/Windows guest running on top of KVM will use TSC page > clocksource in two cases: > - L0 exposes invariant TSC (CPUID.8007H:EDX[8]). > - L0 provides Hyper-V Reenlightenment support (CPUID.4003H:EAX[13]). > >

[PATCH 1/3] x86/kvm/hyper-v: add reenlightenment MSRs support

2018-02-28 Thread Vitaly Kuznetsov
Nested Hyper-V/Windows guest running on top of KVM will use TSC page clocksource in two cases: - L0 exposes invariant TSC (CPUID.8007H:EDX[8]). - L0 provides Hyper-V Reenlightenment support (CPUID.4003H:EAX[13]). Exposing invariant TSC effectively blocks migration to hosts with different T