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Commit c25bc163 authored by Gleb Natapov's avatar Gleb Natapov Committed by Marcelo Tosatti
Browse files

KVM: Implement NotifyLongSpinWait HYPER-V hypercall 



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

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarVadim Rozenfeld <vrozenfe@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 10388a07

arch/x86/kvm/x86.c

+9 −1
Original line number Diff line number Diff line
@@ -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);



	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) {

include/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -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