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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: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220303154127.202856-11-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Joao Martins 2022-03-03 15:41:20 +00:00 committed by Paolo Bonzini
parent 2fd6df2f2b
commit 0ec6c5c5bb
1 changed files with 18 additions and 1 deletions
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19
arch/x86/kvm/xen.c
View File

@ -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;
}