From: Joao Martins <joao.m.martins@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
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 ef80f2df1d10..ed6b18e0d31f 100644
--- 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;
}
--
2.33.1
