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KVM: Implement NotifyLongSpinWait HYPER-V hypercall

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Windows issues this hypercall after guest was spinning on a spinlock
for too many iterations.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Vadim Rozenfeld <vrozenfe@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-01-17 15:51:24 +02:00 committed by Marcelo Tosatti
parent 10388a0716
commit c25bc1638a
2 changed files with 10 additions and 1 deletions
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10
arch/x86/kvm/x86.c
View file

@ -1564,6 +1564,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_VCPU_EVENTS:
case KVM_CAP_HYPERV:
case KVM_CAP_HYPERV_VAPIC:
case KVM_CAP_HYPERV_SPIN:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@ -3827,7 +3828,14 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
res = HV_STATUS_INVALID_HYPERCALL_CODE;
switch (code) {
case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
kvm_vcpu_on_spin(vcpu);
break;
default:
res = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
}
ret = res | (((u64)rep_done & 0xfff) << 32);
if (longmode) {

1
include/linux/kvm.h
View file

@ -499,6 +499,7 @@ struct kvm_ioeventfd {
#define KVM_CAP_PPC_SEGSTATE 43
#define KVM_CAP_HYPERV 44
#define KVM_CAP_HYPERV_VAPIC 45
#define KVM_CAP_HYPERV_SPIN 46
#ifdef KVM_CAP_IRQ_ROUTING