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 <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-11-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 3d95167028ba97be5af5d9a9e485af2ef725a958..0dae583c4a1dfa5cb78ba19cac98adcb7dc60f4f 100644 (file)
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -19,6 +19,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>
 #include <xen/interface/event_channel.h>
+#include <xen/interface/sched.h>
 
 #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;
        }