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| author | Jens Freimann <jfrei@linux.vnet.ibm.com> | 2012-04-26 09:03:36 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2012-05-01 21:04:06 +0200 |
| commit | 4170aea1a77d7adf9e35ab4d3c17086c38ca6c09 (patch) | |
| tree | 4d4f50dff271275e102569c86aea1a12e96bdfc3 | |
| parent | eca3ed0343ba413937f34ad4f8c4822dc82924e5 (diff) | |
| download | qemu-4170aea1a77d7adf9e35ab4d3c17086c38ca6c09.tar.gz qemu-4170aea1a77d7adf9e35ab4d3c17086c38ca6c09.tar.bz2 qemu-4170aea1a77d7adf9e35ab4d3c17086c38ca6c09.zip | |
s390: reset avail and used index on reboot
reset the guest vring avail/used idx fields, otherwise it's possible
that old values remain in memory which would cause a reboot to fail
with a "Guest moved used index" message
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
| -rw-r--r-- | hw/s390-virtio-bus.c | 19 | ||||
| -rw-r--r-- | hw/s390-virtio-bus.h | 4 | ||||
| -rw-r--r-- | hw/s390-virtio.c | 1 |
3 files changed, 23 insertions, 1 deletions
diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c index 74419b3725..63ccd5c35a 100644 --- a/hw/s390-virtio-bus.c +++ b/hw/s390-virtio-bus.c @@ -63,6 +63,23 @@ static void s390_virtio_bus_reset(void *opaque) bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE; } +void s390_virtio_reset_idx(VirtIOS390Device *dev) +{ + int i; + target_phys_addr_t idx_addr; + uint8_t num_vq; + + num_vq = s390_virtio_device_num_vq(dev); + for (i = 0; i < num_vq; i++) { + idx_addr = virtio_queue_get_avail_addr(dev->vdev, i) + + VIRTIO_VRING_AVAIL_IDX_OFFS; + stw_phys(idx_addr, 0); + idx_addr = virtio_queue_get_used_addr(dev->vdev, i) + + VIRTIO_VRING_USED_IDX_OFFS; + stw_phys(idx_addr, 0); + } +} + VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size) { VirtIOS390Bus *bus; @@ -121,7 +138,7 @@ static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev) virtio_bind_device(vdev, &virtio_s390_bindings, dev); dev->host_features = vdev->get_features(vdev, dev->host_features); s390_virtio_device_sync(dev); - + s390_virtio_reset_idx(dev); if (dev->qdev.hotplugged) { CPUS390XState *env = s390_cpu_addr2state(0); s390_virtio_irq(env, VIRTIO_PARAM_DEV_ADD, dev->dev_offs); diff --git a/hw/s390-virtio-bus.h b/hw/s390-virtio-bus.h index 0e60bc0fa2..49e6c462df 100644 --- a/hw/s390-virtio-bus.h +++ b/hw/s390-virtio-bus.h @@ -34,6 +34,8 @@ #define VIRTIO_VQCONFIG_LEN 24 #define VIRTIO_RING_LEN (TARGET_PAGE_SIZE * 3) +#define VIRTIO_VRING_AVAIL_IDX_OFFS 2 +#define VIRTIO_VRING_USED_IDX_OFFS 2 #define S390_DEVICE_PAGES 512 #define VIRTIO_PARAM_MASK 0xff @@ -90,3 +92,5 @@ VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus, ram_addr_t mem, int *vq_num); VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem); void s390_virtio_device_sync(VirtIOS390Device *dev); +void s390_virtio_reset_idx(VirtIOS390Device *dev); + diff --git a/hw/s390-virtio.c b/hw/s390-virtio.c index d7dc8571d8..c0e19fd66d 100644 --- a/hw/s390-virtio.c +++ b/hw/s390-virtio.c @@ -99,6 +99,7 @@ int s390_virtio_hypercall(CPUS390XState *env, uint64_t mem, uint64_t hypercall) virtio_reset(dev->vdev); stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0); s390_virtio_device_sync(dev); + s390_virtio_reset_idx(dev); break; } case KVM_S390_VIRTIO_SET_STATUS: |