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hw/xen: Implement EVTCHNOP_bind_ipi

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Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2022-12-13 23:12:59 +00:00
parent c723d4c15e
commit f5417856d2
3 changed files with 86 additions and 0 deletions
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69
hw/i386/kvm/xen_evtchn.c
View File

@ -13,6 +13,7 @@
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "qemu/main-loop.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "qom/object.h"
#include "exec/target_page.h"
@ -231,6 +232,43 @@ static void inject_callback(XenEvtchnState *s, uint32_t vcpu)
kvm_xen_inject_vcpu_callback_vector(vcpu, type);
}
static void deassign_kernel_port(evtchn_port_t port)
{
struct kvm_xen_hvm_attr ha;
int ret;
ha.type = KVM_XEN_ATTR_TYPE_EVTCHN;
ha.u.evtchn.send_port = port;
ha.u.evtchn.flags = KVM_XEN_EVTCHN_DEASSIGN;
ret = kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha);
if (ret) {
qemu_log_mask(LOG_GUEST_ERROR, "Failed to unbind kernel port %d: %s\n",
port, strerror(ret));
}
}
static int assign_kernel_port(uint16_t type, evtchn_port_t port,
uint32_t vcpu_id)
{
CPUState *cpu = qemu_get_cpu(vcpu_id);
struct kvm_xen_hvm_attr ha;
if (!cpu) {
return -ENOENT;
}
ha.type = KVM_XEN_ATTR_TYPE_EVTCHN;
ha.u.evtchn.send_port = port;
ha.u.evtchn.type = type;
ha.u.evtchn.flags = 0;
ha.u.evtchn.deliver.port.port = port;
ha.u.evtchn.deliver.port.vcpu = kvm_arch_vcpu_id(cpu);
ha.u.evtchn.deliver.port.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_SET_ATTR, &ha);
}
static bool valid_port(evtchn_port_t port)
{
if (!port) {
@ -551,6 +589,12 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
p->type_val, 0);
break;
case EVTCHNSTAT_ipi:
if (s->evtchn_in_kernel) {
deassign_kernel_port(port);
}
break;
default:
break;
}
@ -640,3 +684,28 @@ int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq)
return ret;
}
int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
{
XenEvtchnState *s = xen_evtchn_singleton;
int ret;
if (!s) {
return -ENOTSUP;
}
if (!valid_vcpu(ipi->vcpu)) {
return -ENOENT;
}
qemu_mutex_lock(&s->port_lock);
ret = allocate_port(s, ipi->vcpu, EVTCHNSTAT_ipi, 0, &ipi->port);
if (!ret && s->evtchn_in_kernel) {
assign_kernel_port(EVTCHNSTAT_ipi, ipi->port, ipi->vcpu);
}
qemu_mutex_unlock(&s->port_lock);
return ret;
}

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

@ -19,9 +19,11 @@ struct evtchn_status;
struct evtchn_close;
struct evtchn_unmask;
struct evtchn_bind_virq;
struct evtchn_bind_ipi;
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);
#endif /* QEMU_XEN_EVTCHN_H */

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

@ -894,6 +894,21 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
}
break;
}
case EVTCHNOP_bind_ipi: {
struct evtchn_bind_ipi ipi;
qemu_build_assert(sizeof(ipi) == 8);
if (kvm_copy_from_gva(cs, arg, &ipi, sizeof(ipi))) {
err = -EFAULT;
break;
}
err = xen_evtchn_bind_ipi_op(&ipi);
if (!err && kvm_copy_to_gva(cs, arg, &ipi, sizeof(ipi))) {
err = -EFAULT;
}
break;
}
default:
return false;
}