Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6

[pandora-kernel.git] / Documentation / virtual / kvm / msr.txt

diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt
index d079aed..5031780 100644 (file)
--- a/Documentation/virtual/kvm/msr.txt
+++ b/Documentation/virtual/kvm/msr.txt
@@ -185,3 +185,37 @@ MSR_KVM_ASYNC_PF_EN: 0x4b564d02
 
        Currently type 2 APF will be always delivered on the same vcpu as
        type 1 was, but guest should not rely on that.
+
+MSR_KVM_STEAL_TIME: 0x4b564d03
+
+       data: 64-byte alignment physical address of a memory area which must be
+       in guest RAM, plus an enable bit in bit 0. This memory is expected to
+       hold a copy of the following structure:
+
+       struct kvm_steal_time {
+               __u64 steal;
+               __u32 version;
+               __u32 flags;
+               __u32 pad[12];
+       }
+
+       whose data will be filled in by the hypervisor periodically. Only one
+       write, or registration, is needed for each VCPU. The interval between
+       updates of this structure is arbitrary and implementation-dependent.
+       The hypervisor may update this structure at any time it sees fit until
+       anything with bit0 == 0 is written to it. Guest is required to make sure
+       this structure is initialized to zero.
+
+       Fields have the following meanings:
+
+               version: a sequence counter. In other words, guest has to check
+               this field before and after grabbing time information and make
+               sure they are both equal and even. An odd version indicates an
+               in-progress update.
+
+               flags: At this point, always zero. May be used to indicate
+               changes in this structure in the future.
+
+               steal: the amount of time in which this vCPU did not run, in
+               nanoseconds. Time during which the vcpu is idle, will not be
+               reported as steal time.