linux-kernel - [PATCH RFC 30/39] KVM: x86/xen: add additional evtchn ops

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Date:   Wed, 20 Feb 2019 20:16:00 +0000
From:   Joao Martins <joao.m.martins@...cle.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ankur Arora <ankur.a.arora@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [PATCH RFC 30/39] KVM: x86/xen: add additional evtchn ops

From: Ankur Arora <ankur.a.arora@...cle.com>

Add support for changing event channel affinity (EVTCHNOP_bind_vcpu)
and closing an event (EVTCHNOP_close).

We just piggy back on the functionality already implemented for
guest event channels.

Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 arch/x86/kvm/xen.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 1988ed3866bf..666dd6d1f5a3 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -2188,6 +2188,38 @@ static int shim_hcall_evtchn(int op, void *p)
 		ret = shim_hcall_evtchn_send(xen_shim, send);
 		break;
 	}
+	case EVTCHNOP_bind_virq: {
+		struct evtchn_bind_virq *un;
+
+		un = (struct evtchn_bind_virq *) p;
+
+		evt.fd = -1;
+		evt.port = 0;
+		evt.type = XEN_EVTCHN_TYPE_VIRQ;
+		ret = kvm_xen_eventfd_assign(NULL, &xen_shim->port_to_evt,
+					     &xen_shim->xen_lock, &evt);
+		un->port = evt.port;
+		break;
+	}
+	case EVTCHNOP_bind_vcpu: {
+		struct evtchn_bind_vcpu *bind_vcpu;
+
+		bind_vcpu = (struct evtchn_bind_vcpu *) p;
+
+		evt.port = bind_vcpu->port;
+		evt.vcpu = bind_vcpu->vcpu;
+		ret = kvm_xen_eventfd_update(NULL, &xen_shim->port_to_evt,
+					     &xen_shim->xen_lock, &evt);
+		break;
+	}
+	case EVTCHNOP_close: {
+		struct evtchn_close *cls;
+
+		cls = (struct evtchn_close *) p;
+		ret = kvm_xen_eventfd_deassign(NULL, &xen_shim->port_to_evt,
+					       &xen_shim->xen_lock, cls->port);
+		break;
+	}
 	default:
 		ret = -EINVAL;
 		break;
-- 
2.11.0