Commit 0ec6c5c5 authored by Joao Martins's avatar Joao Martins Committed by Paolo Bonzini
Browse files

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: default avatarJoao Martins <joao.m.martins@oracle.com>
Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-11-dwmw2@infradead.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 2fd6df2f

arch/x86/kvm/xen.c

+18 −1
Original line number Original line Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <xen/interface/xen.h>

#include <xen/interface/xen.h>

#include <xen/interface/vcpu.h>

#include <xen/interface/vcpu.h>

#include <xen/interface/event_channel.h>

#include <xen/interface/event_channel.h>

#include <xen/interface/sched.h>





#include "trace.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);

	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)

int kvm_xen_hypercall(struct kvm_vcpu *vcpu)

{

{

	bool longmode;

	bool longmode;
@@ -838,7 +853,9 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) 
		if (params[0] == EVTCHNOP_send)

		if (params[0] == EVTCHNOP_send)

			handled = kvm_xen_hcall_evtchn_send(vcpu, params[1], &r);

			handled = kvm_xen_hcall_evtchn_send(vcpu, params[1], &r);

		break;

		break;



	case __HYPERVISOR_sched_op:

		handled = kvm_xen_hcall_sched_op(vcpu, params[0], params[1], &r);

		break;

	default:

	default:

		break;

		break;

	}

	}