Re: [PATCH RFC V4 2/5] kvm hypervisor : Add a hypercall to KVM hypervisor to support pv-ticketlocks
From: Avi Kivity <hidden>
Date: 2012-01-16 09:03:15
Also in:
kvm, xen-devel
On 01/14/2012 08:25 PM, Raghavendra K T wrote:
Add a hypercall to KVM hypervisor to support pv-ticketlocks
KVM_HC_KICK_CPU allows the calling vcpu to kick another vcpu out of halt state.
The presence of these hypercalls is indicated to guest via
KVM_FEATURE_PVLOCK_KICK/KVM_CAP_PVLOCK_KICK.
Qemu needs a corresponding patch to pass up the presence of this feature to
guest via cpuid. Patch to qemu will be sent separately.No need to discuss qemu in a kernel patch.
quoted hunk ↗ jump to hunk
+/* + * kvm_pv_kick_cpu_op: Kick a vcpu. + * + * @apicid - apicid of vcpu to be kicked. + */ +static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid) +{ + struct kvm_vcpu *vcpu = NULL; + int i; + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (!kvm_apic_present(vcpu)) + continue; + + if (kvm_apic_match_dest(vcpu, 0, 0, apicid, 0)) + break; + } + if (vcpu) { + kvm_make_request(KVM_REQ_PVLOCK_KICK, vcpu); + kvm_vcpu_kick(vcpu); + } +} +
The code that handles KVM_REQ_PVLOCK_KICK needs to be in this patch. -- error compiling committee.c: too many arguments to function