Messages in this thread | | | Date | Wed, 30 May 2012 19:14:56 +0530 | From | Raghavendra K T <> | Subject | Re: [PATCH RFC V8 17/17] Documentation/kvm : Add documentation on Hypercalls and features used for PV spinlock |
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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@linux.vnet.ibm.com> >> >> 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@linux.vnet.ibm.com> >> Signed-off-by: Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com> >> --- >> 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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