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[RFC PATCH v4 30/47] hw/xen: Implement EVTCHNOP_close
From: |
David Woodhouse |
Subject: |
[RFC PATCH v4 30/47] hw/xen: Implement EVTCHNOP_close |
Date: |
Wed, 21 Dec 2022 01:06:06 +0000 |
From: David Woodhouse <dwmw@amazon.co.uk>
It calls an internal close_port() helper which will also be used from
EVTCHNOP_reset and will actually do the work to disconnect/unbind a port
once any of that is actually implemented in the first place.
That in turn calls a free_port() internal function which will be in
error paths after allocation.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
hw/i386/kvm/xen_evtchn.c | 51 +++++++++++++++++++++++++++++++++++++++
hw/i386/kvm/xen_evtchn.h | 2 ++
target/i386/kvm/xen-emu.c | 12 +++++++++
3 files changed, 65 insertions(+)
diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index c162be86c7..3ccf72d78b 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -252,3 +252,54 @@ int xen_evtchn_status_op(struct evtchn_status *status)
qemu_mutex_unlock(&s->port_lock);
return 0;
}
+
+static void free_port(XenEvtchnState *s, evtchn_port_t port)
+{
+ s->port_table[port].type = EVTCHNSTAT_closed;
+ s->port_table[port].type_val = 0;
+ s->port_table[port].vcpu = 0;
+
+ if (s->nr_ports == port + 1) {
+ do {
+ s->nr_ports--;
+ } while (s->port_table[s->nr_ports - 1].type == EVTCHNSTAT_closed);
+ }
+}
+
+static int close_port(XenEvtchnState *s, evtchn_port_t port)
+{
+ XenEvtchnPort *p = &s->port_table[port];
+
+ switch (p->type) {
+ case EVTCHNSTAT_closed:
+ return -ENOENT;
+
+ default:
+ break;
+ }
+
+ free_port(s, port);
+ return 0;
+}
+
+int xen_evtchn_close_op(struct evtchn_close *close)
+{
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int ret;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ if (!valid_port(close->port)) {
+ return -EINVAL;
+ }
+
+ qemu_mutex_lock(&s->port_lock);
+
+ ret = close_port(s, close->port);
+
+ qemu_mutex_unlock(&s->port_lock);
+
+ return ret;
+}
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index 76467636ee..cb3924941a 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -16,6 +16,8 @@ void xen_evtchn_create(void);
int xen_evtchn_set_callback_param(uint64_t param);
struct evtchn_status;
+struct evtchn_close;
int xen_evtchn_status_op(struct evtchn_status *status);
+int xen_evtchn_close_op(struct evtchn_close *close);
#endif /* QEMU_XEN_EVTCHN_H */
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 249cb88ec8..a81dbf5b63 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -790,6 +790,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit
*exit, X86CPU *cpu,
}
break;
}
+ case EVTCHNOP_close: {
+ struct evtchn_close close;
+
+ qemu_build_assert(sizeof(close) == 4);
+ if (kvm_copy_from_gva(cs, arg, &close, sizeof(close))) {
+ err = -EFAULT;
+ break;
+ }
+
+ err = xen_evtchn_close_op(&close);
+ break;
+ }
default:
return false;
}
--
2.35.3
- [RFC PATCH v4 22/47] i386/xen: handle VCPUOP_register_vcpu_time_info, (continued)
- [RFC PATCH v4 22/47] i386/xen: handle VCPUOP_register_vcpu_time_info, David Woodhouse, 2022/12/20
- [RFC PATCH v4 34/47] hw/xen: Implement EVTCHNOP_send, David Woodhouse, 2022/12/20
- [RFC PATCH v4 46/47] hw/xen: Implement GNTTABOP_query_size, David Woodhouse, 2022/12/20
- [RFC PATCH v4 20/47] i386/xen: implement HYPERVISOR_vcpu_op, David Woodhouse, 2022/12/20
- [RFC PATCH v4 31/47] hw/xen: Implement EVTCHNOP_unmask, David Woodhouse, 2022/12/20
- [RFC PATCH v4 27/47] hw/xen: Add xen_evtchn device for event channel emulation, David Woodhouse, 2022/12/20
- [RFC PATCH v4 33/47] hw/xen: Implement EVTCHNOP_bind_ipi, David Woodhouse, 2022/12/20
- [RFC PATCH v4 25/47] i386/xen: implement HVMOP_set_evtchn_upcall_vector, David Woodhouse, 2022/12/20
- [RFC PATCH v4 47/47] i386/xen: handle PV timer hypercalls, David Woodhouse, 2022/12/20
- [RFC PATCH v4 39/47] i386/xen: add monitor commands to test event injection, David Woodhouse, 2022/12/20
- [RFC PATCH v4 30/47] hw/xen: Implement EVTCHNOP_close,
David Woodhouse <=
- [RFC PATCH v4 43/47] hw/xen: Add xen_gnttab device for grant table emulation, David Woodhouse, 2022/12/20
- [RFC PATCH v4 06/47] i386/hvm: Set Xen vCPU ID in KVM, David Woodhouse, 2022/12/20
- [RFC PATCH v4 36/47] hw/xen: Implement EVTCHNOP_bind_interdomain, David Woodhouse, 2022/12/20
- [RFC PATCH v4 07/47] xen-platform: exclude vfio-pci from the PCI platform unplug, David Woodhouse, 2022/12/20
- [RFC PATCH v4 10/47] i386/xen: handle guest hypercalls, David Woodhouse, 2022/12/20
- [RFC PATCH v4 42/47] kvm/i386: Add xen-gnttab-max-frames property, David Woodhouse, 2022/12/20
- [RFC PATCH v4 28/47] i386/xen: Add support for Xen event channel delivery to vCPU, David Woodhouse, 2022/12/20
- [RFC PATCH v4 18/47] i386/xen: implement XENMEM_add_to_physmap_batch, David Woodhouse, 2022/12/20
- [RFC PATCH v4 09/47] hw/xen_backend: refactor xen_be_init(), David Woodhouse, 2022/12/20