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hw/xen: Implement EVTCHNOP_alloc_unbound 

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2022-12-14 16:39:48 +00:00
parent cf7679abdd
commit e1db61b87b
3 changed files with 49 additions and 0 deletions
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32
hw/i386/kvm/xen_evtchn.c
View File

@ -837,6 +837,38 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
return ret;
}
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
{
XenEvtchnState *s = xen_evtchn_singleton;
uint16_t type_val;
int ret;
if (!s) {
return -ENOTSUP;
}
if (alloc->dom != DOMID_SELF && alloc->dom != xen_domid) {
return -ESRCH;
}
if (alloc->remote_dom == DOMID_QEMU) {
type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
} else if (alloc->remote_dom == DOMID_SELF ||
alloc->remote_dom == xen_domid) {
type_val = 0;
} else {
return -EPERM;
}
qemu_mutex_lock(&s->port_lock);
ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &alloc->port);
qemu_mutex_unlock(&s->port_lock);
return ret;
}
int xen_evtchn_send_op(struct evtchn_send *send)
{
XenEvtchnState *s = xen_evtchn_singleton;

2
hw/i386/kvm/xen_evtchn.h
View File

@ -21,11 +21,13 @@ struct evtchn_unmask;
struct evtchn_bind_virq;
struct evtchn_bind_ipi;
struct evtchn_send;
struct evtchn_alloc_unbound;
int xen_evtchn_status_op(struct evtchn_status *status);
int xen_evtchn_close_op(struct evtchn_close *close);
int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq);
int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi);
int xen_evtchn_send_op(struct evtchn_send *send);
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
#endif /* QEMU_XEN_EVTCHN_H */

15
target/i386/kvm/xen-emu.c
View File

@ -921,6 +921,21 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
err = xen_evtchn_send_op(&send);
break;
}
case EVTCHNOP_alloc_unbound: {
struct evtchn_alloc_unbound alloc;
qemu_build_assert(sizeof(alloc) == 8);
if (kvm_copy_from_gva(cs, arg, &alloc, sizeof(alloc))) {
err = -EFAULT;
break;
}
err = xen_evtchn_alloc_unbound_op(&alloc);
if (!err && kvm_copy_to_gva(cs, arg, &alloc, sizeof(alloc))) {
err = -EFAULT;
}
break;
}
default:
return false;
}