From 0ec6c5c5bb6585320a2e51a316c2fd381fdec836 Mon Sep 17 00:00:00 2001 From: Joao Martins Date: Thu, 3 Mar 2022 15:41:20 +0000 Subject: [PATCH] KVM: x86/xen: handle PV IPI vcpu yield Cooperative Linux guests after an IPI-many may yield vcpu if any of the IPI'd vcpus were preempted (i.e. runstate is 'runnable'.) Support SCHEDOP_yield for handling yield. Signed-off-by: Joao Martins Signed-off-by: David Woodhouse Signed-off-by: Paolo Bonzini Message-Id: <20220303154127.202856-11-dwmw2@infradead.org> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/xen.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index 3d95167028ba..0dae583c4a1d 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "trace.h" @@ -798,6 +799,20 @@ static int kvm_xen_hypercall_complete_userspace(struct kvm_vcpu *vcpu) return kvm_xen_hypercall_set_result(vcpu, run->xen.u.hcall.result); } +static bool kvm_xen_hcall_sched_op(struct kvm_vcpu *vcpu, int cmd, u64 param, u64 *r) +{ + switch (cmd) { + case SCHEDOP_yield: + kvm_vcpu_on_spin(vcpu, true); + *r = 0; + return true; + default: + break; + } + + return false; +} + int kvm_xen_hypercall(struct kvm_vcpu *vcpu) { bool longmode; @@ -838,7 +853,9 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) if (params[0] == EVTCHNOP_send) handled = kvm_xen_hcall_evtchn_send(vcpu, params[1], &r); break; - + case __HYPERVISOR_sched_op: + handled = kvm_xen_hcall_sched_op(vcpu, params[0], params[1], &r); + break; default: break; }