Re: [PATCH v3 3/7] x86/hyper-v: reenlightenment notifications support

[Thomas Gleixner]

On Tue, 16 Jan 2018, Vitaly Kuznetsov wrote:
> Hyper-V supports Live Migration notification. This is supposed to be used
> in conjunction with TSC emulation: when we are migrated to a host with
> different TSC frequency for some short period host emulates our accesses
> to TSC and sends us an interrupt to notify about the event. When we're
> done updating everything we can disable TSC emulation and everything will
> start working fast again.
> 
> We didn't need these notifications before as Hyper-V guests are not
> supposed to use TSC as a clocksource: in Linux we even mark it as unstable
> on boot. Guests normally use 'tsc page' clocksouce and host updates its
> values on migrations automatically.
> 
> Things change when we want to run nested virtualization: even when we pass
> through PV clocksources (kvm-clock or tsc page) to our guests we need to
> know TSC frequency and when it changes.
> 
> Hyper-V Top Level Functional Specification (as of v5.0b) wrongly specifies
> EAX:BIT(12) of CPUID:0x40000009 as the feature identification bit. The
> right one to check is EAX:BIT(13) of CPUID:0x40000003. I was assured that
> the fix in on the way.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>