diff mbox series

[v2,10/17] KVM: x86/xen: handle PV IPI vcpu yield

Message ID 20220228200552.150406-11-dwmw2@infradead.org (mailing list archive)
State New, archived
Headers show
Series KVM: Add Xen event channel acceleration | expand

Commit Message

David Woodhouse Feb. 28, 2022, 8:05 p.m. UTC 
From: Joao Martins <joao.m.martins@oracle.com>

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>
---
 arch/x86/kvm/xen.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)
diff mbox series

Patch

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;
 	}