Re: [Xen-devel] [PATCH RFC V8 17/17] Documentation/kvm : Add documentation on Hypercalls and features used for PV spinlock

[Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>]

On 05/30/2012 05:24 PM, Jan Kiszka wrote:
> On 2012-05-02 12:09, Raghavendra K T wrote:
> > From: Raghavendra K T<raghavendra.kt@xxxxxxxxxxxxxxxxxx>
> >
> > KVM_HC_KICK_CPU  hypercall added to wakeup halted vcpu in paravirtual spinlock
> > enabled guest.
> >
> > KVM_FEATURE_PV_UNHALT enables guest to check whether pv spinlock can be enabled
> > in guest.
> >
> > Thanks Alex for KVM_HC_FEATURES inputs and Vatsa for rewriting KVM_HC_KICK_CPU
> This contains valuable documentation for features that are already
> supported. Can you break them out and post as separate patch already?
> One comment on them below.
That sounds like a good idea. Sure, will do that.

> > Signed-off-by: Srivatsa Vaddagiri<vatsa@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Raghavendra K T<raghavendra.kt@xxxxxxxxxxxxxxxxxx>
> > ---
> >   Documentation/virtual/kvm/cpuid.txt      |    4 ++
> >   Documentation/virtual/kvm/hypercalls.txt |   60 ++++++++++++++++++++++++++++++
> >   2 files changed, 64 insertions(+), 0 deletions(-)
> > diff --git a/Documentation/virtual/kvm/cpuid.txt 
> > b/Documentation/virtual/kvm/cpuid.txt
> > index 8820685..062dff9 100644
> > --- a/Documentation/virtual/kvm/cpuid.txt
> > +++ b/Documentation/virtual/kvm/cpuid.txt
> > @@ -39,6 +39,10 @@ KVM_FEATURE_CLOCKSOURCE2           ||     3 || kvmclock 
> > available at msrs
> >   KVM_FEATURE_ASYNC_PF               ||     4 || async pf can be enabled by
> >                                      ||       || writing to msr 0x4b564d02
> >   ------------------------------------------------------------------------------
> > +KVM_FEATURE_PV_UNHALT              ||     6 || guest checks this feature bit
> > +                                   ||       || before enabling paravirtualized
> > +                                   ||       || spinlock support.
> > +------------------------------------------------------------------------------
> >   KVM_FEATURE_CLOCKSOURCE_STABLE_BIT ||    24 || host will warn if no guest-side
> >                                      ||       || per-cpu warps are expected in
> >                                      ||       || kvmclock.
> > diff --git a/Documentation/virtual/kvm/hypercalls.txt 
> > b/Documentation/virtual/kvm/hypercalls.txt
> > new file mode 100644
> > index 0000000..bc3f14a
> > --- /dev/null
> > +++ b/Documentation/virtual/kvm/hypercalls.txt
> > @@ -0,0 +1,60 @@
> > +KVM Hypercalls Documentation
> > +===========================
> > +The template for each hypercall is:
> > +1. Hypercall name, value.
> > +2. Architecture(s)
> > +3. Status (deprecated, obsolete, active)
> > +4. Purpose
> > +
> > +1. KVM_HC_VAPIC_POLL_IRQ
> > +------------------------
> > +Value: 1
> > +Architecture: x86
> > +Purpose: None
> Purpose: Trigger guest exit so that the host can check for pending
> interrupts on reentry.
will add fold this and resend.

[...]


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