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Commit 3dd3e0ce authored by Pan Xinhui's avatar Pan Xinhui Committed by Ingo Molnar
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Documentation/virtual/kvm: Support the vCPU preemption check 



Commit ("x86/kvm: support vCPU preemption check") added a new
struct kvm_steal_time::preempted field. This field tells us if
a vCPU is running or not.

It is zero if some old KVM does not support this field or if the vCPU
is not preempted. Other values means the vCPU has been preempted.

Signed-off-by: default avatarPan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Cc: David.Laight@ACULAB.COM
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: benh@kernel.crashing.org
Cc: boqun.feng@gmail.com
Cc: borntraeger@de.ibm.com
Cc: bsingharora@gmail.com
Cc: dave@stgolabs.net
Cc: jgross@suse.com
Cc: kernellwp@gmail.com
Cc: konrad.wilk@oracle.com
Cc: linuxppc-dev@lists.ozlabs.org
Cc: mpe@ellerman.id.au
Cc: paulmck@linux.vnet.ibm.com
Cc: paulus@samba.org
Cc: virtualization@lists.linux-foundation.org
Cc: will.deacon@arm.com
Cc: xen-devel-request@lists.xenproject.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1478077718-37424-12-git-send-email-xinhui.pan@linux.vnet.ibm.com


[ Various typo fixes. ]
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent de7689cf

Documentation/virtual/kvm/msr.txt

+8 −1
Original line number Diff line number Diff line
@@ -208,7 +208,9 @@ MSR_KVM_STEAL_TIME: 0x4b564d03 
		__u64 steal;

		__u32 version;

		__u32 flags;

		__u32 pad[12];

		__u8  preempted;

		__u8  u8_pad[3];

		__u32 pad[11];

	}



	whose data will be filled in by the hypervisor periodically. Only one
@@ -232,6 +234,11 @@ MSR_KVM_STEAL_TIME: 0x4b564d03 
		nanoseconds. Time during which the vcpu is idle, will not be

		reported as steal time.



		preempted: indicate the vCPU who owns this struct is running or

		not. Non-zero values mean the vCPU has been preempted. Zero

		means the vCPU is not preempted. NOTE, it is always zero if the

		the hypervisor doesn't support this field.



MSR_KVM_EOI_EN: 0x4b564d04

	data: Bit 0 is 1 when PV end of interrupt is enabled on the vcpu; 0

	when disabled.  Bit 1 is reserved and must be zero.  When PV end of