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From: David Woodhouse <dwmw2@infradead.org>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Joao Martins <joao.m.martins@oracle.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Metin Kaya <metikaya@amazon.co.uk>,
	Paul Durrant <pdurrant@amazon.co.uk>
Subject: [PATCH v0 09/15] KVM: x86/xen: handle PV IPI vcpu yield
Date: Thu, 10 Feb 2022 00:27:15 +0000	[thread overview]
Message-ID: <20220210002721.273608-10-dwmw2@infradead.org> (raw)
In-Reply-To: <20220210002721.273608-1-dwmw2@infradead.org>

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 --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index 909c25521554..3df44c996d66 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"
 
@@ -800,6 +801,20 @@ 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;
@@ -840,7 +855,9 @@ 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


  parent reply	other threads:[~2022-02-10  2:08 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-10  0:27 [PATCH v0 00/15] KVM: Add Xen event channel acceleration David Woodhouse
2022-02-10  0:27 ` [PATCH v0 01/15] KVM: x86/xen: Fix runstate updates to be atomic when preempting vCPU David Woodhouse
2022-02-10  0:27 ` [PATCH v0 02/15] KVM: x86/xen: Use gfn_to_pfn_cache for runstate area David Woodhouse
2022-02-18 19:57   ` Sean Christopherson
2022-02-18 21:45     ` David Woodhouse
2022-02-10  0:27 ` [PATCH v0 03/15] KVM: x86: Use gfn_to_pfn_cache for pv_time David Woodhouse
2022-02-10  0:27 ` [PATCH v0 04/15] KVM: x86/xen: Use gfn_to_pfn_cache for vcpu_info David Woodhouse
2022-02-10  0:27 ` [PATCH v0 05/15] KVM: x86/xen: Use gfn_to_pfn_cache for vcpu_time_info David Woodhouse
2022-02-10  0:27 ` [PATCH v0 06/15] KVM: x86/xen: Make kvm_xen_set_evtchn() reusable from other places David Woodhouse
2022-02-10  0:27 ` [PATCH v0 07/15] KVM: x86/xen: Support direct injection of event channel events David Woodhouse
2022-02-10  0:27 ` [PATCH v0 08/15] KVM: x86/xen: intercept EVTCHNOP_send from guests David Woodhouse
2022-02-10  0:27 ` David Woodhouse [this message]
2022-02-10  0:27 ` [PATCH v0 10/15] KVM: x86/xen: Add KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID David Woodhouse
2022-02-10  0:27 ` [PATCH v0 11/15] KVM: x86/xen: handle PV timers oneshot mode David Woodhouse
2022-02-10  0:27 ` [PATCH v0 12/15] KVM: x86/xen: Kernel acceleration for XENVER_version David Woodhouse
2022-02-10  0:27 ` [PATCH v0 13/15] KVM: x86/xen: Support per-vCPU event channel upcall via local APIC David Woodhouse
2022-02-10  0:27 ` [PATCH v0 14/15] KVM: x86/xen: Advertise and document KVM_XEN_HVM_CONFIG_EVTCHN_SEND David Woodhouse
2022-02-10  0:27 ` [PATCH v0 15/15] KVM: x86/xen: handle PV spinlocks slowpath David Woodhouse

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