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[Qemu-devel] [PATCH v1 08/10] xen/pt: Make xen_pt_unregister_device idem
From: |
Konrad Rzeszutek Wilk |
Subject: |
[Qemu-devel] [PATCH v1 08/10] xen/pt: Make xen_pt_unregister_device idempotent |
Date: |
Thu, 2 Jul 2015 15:51:19 -0400 |
To deal with xen_host_pci_[set|get]_ functions returning error values
and clearing ourselves in the init function we should make the
.exit (xen_pt_unregister_device) function be idempotent in case
the generic code starts calling .exit (or for fun does it before
calling .init!).
Signed-off-by: Konrad Rzeszutek Wilk <address@hidden>
---
hw/xen/xen-host-pci-device.c | 5 +++++
hw/xen/xen-host-pci-device.h | 1 +
hw/xen/xen_pt.c | 22 ++++++++++++++++------
hw/xen/xen_pt.h | 2 ++
4 files changed, 24 insertions(+), 6 deletions(-)
diff --git a/hw/xen/xen-host-pci-device.c b/hw/xen/xen-host-pci-device.c
index 743b37b..5b20570 100644
--- a/hw/xen/xen-host-pci-device.c
+++ b/hw/xen/xen-host-pci-device.c
@@ -387,6 +387,11 @@ error:
return rc;
}
+bool xen_host_pci_device_closed(XenHostPCIDevice *d)
+{
+ return d->config_fd == -1;
+}
+
void xen_host_pci_device_put(XenHostPCIDevice *d)
{
if (d->config_fd >= 0) {
diff --git a/hw/xen/xen-host-pci-device.h b/hw/xen/xen-host-pci-device.h
index c2486f0..16f4805 100644
--- a/hw/xen/xen-host-pci-device.h
+++ b/hw/xen/xen-host-pci-device.h
@@ -38,6 +38,7 @@ typedef struct XenHostPCIDevice {
int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
uint8_t bus, uint8_t dev, uint8_t func);
void xen_host_pci_device_put(XenHostPCIDevice *pci_dev);
+bool xen_host_pci_device_closed(XenHostPCIDevice *d);
int xen_host_pci_get_byte(XenHostPCIDevice *d, int pos, uint8_t *p);
int xen_host_pci_get_word(XenHostPCIDevice *d, int pos, uint16_t *p);
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index 7575311..a094f7c 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -807,6 +807,7 @@ out:
memory_listener_register(&s->memory_listener, &s->dev.bus_master_as);
memory_listener_register(&s->io_listener, &address_space_io);
+ s->listener_set = true;
XEN_PT_LOG(d,
"Real physical device %02x:%02x.%d registered successfully!\n",
s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function);
@@ -818,10 +819,13 @@ static void xen_pt_unregister_device(PCIDevice *d)
{
XenPCIPassthroughState *s = XEN_PT_DEVICE(d);
uint8_t machine_irq = s->machine_irq;
- uint8_t intx = xen_pt_pci_intx(s);
+ uint8_t intx;
int rc;
- if (machine_irq) {
+ /* Note that if xen_host_pci_device_put had closed config_fd, then
+ * intx value becomes 0xff. */
+ intx = xen_pt_pci_intx(s);
+ if (machine_irq && !xen_host_pci_device_closed(&s->real_device)) {
rc = xc_domain_unbind_pt_irq(xen_xc, xen_domid, machine_irq,
PT_IRQ_TYPE_PCI,
pci_bus_num(d->bus),
@@ -836,6 +840,7 @@ static void xen_pt_unregister_device(PCIDevice *d)
}
}
+ /* N.B. xen_pt_config_delete takes care of freeing them. */
if (s->msi) {
xen_pt_msi_disable(s);
}
@@ -855,15 +860,20 @@ static void xen_pt_unregister_device(PCIDevice *d)
machine_irq, errno);
}
}
+ s->machine_irq = 0;
}
/* delete all emulated config registers */
xen_pt_config_delete(s);
- memory_listener_unregister(&s->memory_listener);
- memory_listener_unregister(&s->io_listener);
-
- xen_host_pci_device_put(&s->real_device);
+ if (s->listener_set) {
+ memory_listener_unregister(&s->memory_listener);
+ memory_listener_unregister(&s->io_listener);
+ s->listener_set = false;
+ }
+ if (!xen_host_pci_device_closed(&s->real_device)) {
+ xen_host_pci_device_put(&s->real_device);
+ }
}
static Property xen_pci_passthrough_properties[] = {
diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h
index 586d055..2b58521 100644
--- a/hw/xen/xen_pt.h
+++ b/hw/xen/xen_pt.h
@@ -221,6 +221,7 @@ struct XenPCIPassthroughState {
MemoryListener memory_listener;
MemoryListener io_listener;
+ bool listener_set;
};
int xen_pt_config_init(XenPCIPassthroughState *s);
@@ -286,6 +287,7 @@ static inline uint8_t
xen_pt_pci_intx(XenPCIPassthroughState *s)
" value=%i, acceptable range is 1 - 4\n", r_val);
r_val = 0;
} else {
+ /* Note that if s.real_device.config_fd is closed we make 0xff. */
r_val -= 1;
}
--
2.1.0
- [Qemu-devel] [PATCH v1] Remove XenPTReg->data and use dev.config for guest configuration values., Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 01/10] xen/pt: Use xen_host_pci_get_[byte|word] instead of dev.config, Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 04/10] xen/pt: Use xen_host_pci_get_[byte, word, long] instead of xen_host_pci_get_long, Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 10/10] xen/pt: Check for return values for xen_host_pci_[get|set] in init, Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 08/10] xen/pt: Make xen_pt_unregister_device idempotent,
Konrad Rzeszutek Wilk <=
- [Qemu-devel] [PATCH v1 03/10] xen/pt: Check if reg->init function sets the 'data' past the reg->size, Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 06/10] xen/pt: Log xen_host_pci_get in two init functions, Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 05/10] xen/pt: Remove XenPTReg->data field., Konrad Rzeszutek Wilk, 2015/07/02
- [Qemu-devel] [PATCH v1 02/10] xen/pt: Sync up the dev.config and data values., Konrad Rzeszutek Wilk, 2015/07/02