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[S390] Add hotplug support

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I just submitted a few patches that enable the s390 virtio bus to receive
a hotplug add event. This patch implements the qemu side of it, so that new
hotplug events can be submitted to the guest.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - make s390 virtio hoplug code emulate-capable
This commit is contained in:
Alexander Graf 2010-08-23 18:58:34 +02:00
parent f3c6a169a3
commit 7fa41e536b
2 changed files with 24 additions and 5 deletions
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24
hw/s390-virtio-bus.c
View File

@ -82,12 +82,24 @@ VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
bus->dev_offs = bus->dev_page;
bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
/* Enable hotplugging */
_bus->allow_hotplug = 1;
/* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
*ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
return bus;
}
static void s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
{
if (kvm_enabled()) {
kvm_s390_virtio_irq(env, config_change, token);
} else {
cpu_inject_ext(env, VIRTIO_EXT_CODE, config_change, token);
}
}
static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
{
VirtIOS390Bus *bus;
@ -109,6 +121,11 @@ static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
dev->host_features = vdev->get_features(vdev, dev->host_features);
s390_virtio_device_sync(dev);
if (dev->qdev.hotplugged) {
CPUState *env = s390_cpu_addr2state(0);
s390_virtio_irq(env, VIRTIO_PARAM_DEV_ADD, dev->dev_offs);
}
return 0;
}
@ -310,11 +327,7 @@ static void virtio_s390_notify(void *opaque, uint16_t vector)
uint64_t token = s390_virtio_device_vq_token(dev, vector);
CPUState *env = s390_cpu_addr2state(0);
if (kvm_enabled()) {
kvm_s390_virtio_irq(env, 0, token);
} else {
cpu_inject_ext(env, VIRTIO_EXT_CODE, 0, token);
}
s390_virtio_irq(env, 0, token);
}
static unsigned virtio_s390_get_features(void *opaque)
@ -382,6 +395,7 @@ static void s390_virtio_bus_register_withprop(VirtIOS390DeviceInfo *info)
{
info->qdev.init = s390_virtio_busdev_init;
info->qdev.bus_info = &s390_virtio_bus_info;
info->qdev.unplug = qdev_simple_unplug_cb;
assert(info->qdev.size >= sizeof(VirtIOS390Device));
qdev_register(&info->qdev);

5
hw/s390-virtio-bus.h
View File

@ -35,6 +35,11 @@
#define VIRTIO_RING_LEN (TARGET_PAGE_SIZE * 3)
#define S390_DEVICE_PAGES 512
#define VIRTIO_PARAM_MASK 0xff
#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
#define VIRTIO_PARAM_DEV_ADD 0x2
typedef struct VirtIOS390Device {
DeviceState qdev;
ram_addr_t dev_offs;