From: Pan Xinhui Date: Wed, 2 Nov 2016 09:08:38 +0000 (-0400) Subject: Documentation/virtual/kvm: Support the vCPU preemption check X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3dd3e0ce7989b645eee0174b17f5095e187c7f28;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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: Pan Xinhui Signed-off-by: Peter Zijlstra (Intel) Acked-by: Radim Krčmář Acked-by: Paolo Bonzini Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner 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: Ingo Molnar --- diff --git a/Documentation/virtual/kvm/msr.txt b/Documentation/virtual/kvm/msr.txt index 2a71c8f29f68..0a9ea515512a 100644 --- a/Documentation/virtual/kvm/msr.txt +++ b/Documentation/virtual/kvm/msr.txt @@ -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