diff options
Diffstat (limited to 'hw/virtio/virtio.c')
| -rw-r--r-- | hw/virtio/virtio.c | 1121 |
1 files changed, 1121 insertions, 0 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c new file mode 100644 index 0000000..1c2282c --- /dev/null +++ b/hw/virtio/virtio.c @@ -0,0 +1,1121 @@ +/* + * Virtio Support + * + * Copyright IBM, Corp. 2007 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include <inttypes.h> + +#include "trace.h" +#include "qemu/error-report.h" +#include "hw/virtio/virtio.h" +#include "qemu/atomic.h" +#include "hw/virtio/virtio-bus.h" + +/* The alignment to use between consumer and producer parts of vring. + * x86 pagesize again. */ +#define VIRTIO_PCI_VRING_ALIGN 4096 + +typedef struct VRingDesc +{ + uint64_t addr; + uint32_t len; + uint16_t flags; + uint16_t next; +} VRingDesc; + +typedef struct VRingAvail +{ + uint16_t flags; + uint16_t idx; + uint16_t ring[0]; +} VRingAvail; + +typedef struct VRingUsedElem +{ + uint32_t id; + uint32_t len; +} VRingUsedElem; + +typedef struct VRingUsed +{ + uint16_t flags; + uint16_t idx; + VRingUsedElem ring[0]; +} VRingUsed; + +typedef struct VRing +{ + unsigned int num; + hwaddr desc; + hwaddr avail; + hwaddr used; +} VRing; + +struct VirtQueue +{ + VRing vring; + hwaddr pa; + uint16_t last_avail_idx; + /* Last used index value we have signalled on */ + uint16_t signalled_used; + + /* Last used index value we have signalled on */ + bool signalled_used_valid; + + /* Notification enabled? */ + bool notification; + + uint16_t queue_index; + + int inuse; + + uint16_t vector; + void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq); + VirtIODevice *vdev; + EventNotifier guest_notifier; + EventNotifier host_notifier; +}; + +/* virt queue functions */ +static void virtqueue_init(VirtQueue *vq) +{ + hwaddr pa = vq->pa; + + vq->vring.desc = pa; + vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc); + vq->vring.used = vring_align(vq->vring.avail + + offsetof(VRingAvail, ring[vq->vring.num]), + VIRTIO_PCI_VRING_ALIGN); +} + +static inline uint64_t vring_desc_addr(hwaddr desc_pa, int i) +{ + hwaddr pa; + pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr); + return ldq_phys(pa); +} + +static inline uint32_t vring_desc_len(hwaddr desc_pa, int i) +{ + hwaddr pa; + pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len); + return ldl_phys(pa); +} + +static inline uint16_t vring_desc_flags(hwaddr desc_pa, int i) +{ + hwaddr pa; + pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags); + return lduw_phys(pa); +} + +static inline uint16_t vring_desc_next(hwaddr desc_pa, int i) +{ + hwaddr pa; + pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next); + return lduw_phys(pa); +} + +static inline uint16_t vring_avail_flags(VirtQueue *vq) +{ + hwaddr pa; + pa = vq->vring.avail + offsetof(VRingAvail, flags); + return lduw_phys(pa); +} + +static inline uint16_t vring_avail_idx(VirtQueue *vq) +{ + hwaddr pa; + pa = vq->vring.avail + offsetof(VRingAvail, idx); + return lduw_phys(pa); +} + +static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) +{ + hwaddr pa; + pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); + return lduw_phys(pa); +} + +static inline uint16_t vring_used_event(VirtQueue *vq) +{ + return vring_avail_ring(vq, vq->vring.num); +} + +static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); + stl_phys(pa, val); +} + +static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); + stl_phys(pa, val); +} + +static uint16_t vring_used_idx(VirtQueue *vq) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, idx); + return lduw_phys(pa); +} + +static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, idx); + stw_phys(pa, val); +} + +static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, flags); + stw_phys(pa, lduw_phys(pa) | mask); +} + +static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) +{ + hwaddr pa; + pa = vq->vring.used + offsetof(VRingUsed, flags); + stw_phys(pa, lduw_phys(pa) & ~mask); +} + +static inline void vring_avail_event(VirtQueue *vq, uint16_t val) +{ + hwaddr pa; + if (!vq->notification) { + return; + } + pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); + stw_phys(pa, val); +} + +void virtio_queue_set_notification(VirtQueue *vq, int enable) +{ + vq->notification = enable; + if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { + vring_avail_event(vq, vring_avail_idx(vq)); + } else if (enable) { + vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); + } else { + vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); + } + if (enable) { + /* Expose avail event/used flags before caller checks the avail idx. */ + smp_mb(); + } +} + +int virtio_queue_ready(VirtQueue *vq) +{ + return vq->vring.avail != 0; +} + +int virtio_queue_empty(VirtQueue *vq) +{ + return vring_avail_idx(vq) == vq->last_avail_idx; +} + +void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, + unsigned int len, unsigned int idx) +{ + unsigned int offset; + int i; + + trace_virtqueue_fill(vq, elem, len, idx); + + offset = 0; + for (i = 0; i < elem->in_num; i++) { + size_t size = MIN(len - offset, elem->in_sg[i].iov_len); + + cpu_physical_memory_unmap(elem->in_sg[i].iov_base, + elem->in_sg[i].iov_len, + 1, size); + + offset += size; + } + + for (i = 0; i < elem->out_num; i++) + cpu_physical_memory_unmap(elem->out_sg[i].iov_base, + elem->out_sg[i].iov_len, + 0, elem->out_sg[i].iov_len); + + idx = (idx + vring_used_idx(vq)) % vq->vring.num; + + /* Get a pointer to the next entry in the used ring. */ + vring_used_ring_id(vq, idx, elem->index); + vring_used_ring_len(vq, idx, len); +} + +void virtqueue_flush(VirtQueue *vq, unsigned int count) +{ + uint16_t old, new; + /* Make sure buffer is written before we update index. */ + smp_wmb(); + trace_virtqueue_flush(vq, count); + old = vring_used_idx(vq); + new = old + count; + vring_used_idx_set(vq, new); + vq->inuse -= count; + if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) + vq->signalled_used_valid = false; +} + +void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, + unsigned int len) +{ + virtqueue_fill(vq, elem, len, 0); + virtqueue_flush(vq, 1); +} + +static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) +{ + uint16_t num_heads = vring_avail_idx(vq) - idx; + + /* Check it isn't doing very strange things with descriptor numbers. */ + if (num_heads > vq->vring.num) { + error_report("Guest moved used index from %u to %u", + idx, vring_avail_idx(vq)); + exit(1); + } + /* On success, callers read a descriptor at vq->last_avail_idx. + * Make sure descriptor read does not bypass avail index read. */ + if (num_heads) { + smp_rmb(); + } + + return num_heads; +} + +static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) +{ + unsigned int head; + + /* Grab the next descriptor number they're advertising, and increment + * the index we've seen. */ + head = vring_avail_ring(vq, idx % vq->vring.num); + + /* If their number is silly, that's a fatal mistake. */ + if (head >= vq->vring.num) { + error_report("Guest says index %u is available", head); + exit(1); + } + + return head; +} + +static unsigned virtqueue_next_desc(hwaddr desc_pa, + unsigned int i, unsigned int max) +{ + unsigned int next; + + /* If this descriptor says it doesn't chain, we're done. */ + if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT)) + return max; + + /* Check they're not leading us off end of descriptors. */ + next = vring_desc_next(desc_pa, i); + /* Make sure compiler knows to grab that: we don't want it changing! */ + smp_wmb(); + + if (next >= max) { + error_report("Desc next is %u", next); + exit(1); + } + + return next; +} + +void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes, + unsigned int *out_bytes, + unsigned max_in_bytes, unsigned max_out_bytes) +{ + unsigned int idx; + unsigned int total_bufs, in_total, out_total; + + idx = vq->last_avail_idx; + + total_bufs = in_total = out_total = 0; + while (virtqueue_num_heads(vq, idx)) { + unsigned int max, num_bufs, indirect = 0; + hwaddr desc_pa; + int i; + + max = vq->vring.num; + num_bufs = total_bufs; + i = virtqueue_get_head(vq, idx++); + desc_pa = vq->vring.desc; + + if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) { + if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { + error_report("Invalid size for indirect buffer table"); + exit(1); + } + + /* If we've got too many, that implies a descriptor loop. */ + if (num_bufs >= max) { + error_report("Looped descriptor"); + exit(1); + } + + /* loop over the indirect descriptor table */ + indirect = 1; + max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc); + num_bufs = i = 0; + desc_pa = vring_desc_addr(desc_pa, i); + } + + do { + /* If we've got too many, that implies a descriptor loop. */ + if (++num_bufs > max) { + error_report("Looped descriptor"); + exit(1); + } + + if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) { + in_total += vring_desc_len(desc_pa, i); + } else { + out_total += vring_desc_len(desc_pa, i); + } + if (in_total >= max_in_bytes && out_total >= max_out_bytes) { + goto done; + } + } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max); + + if (!indirect) + total_bufs = num_bufs; + else + total_bufs++; + } +done: + if (in_bytes) { + *in_bytes = in_total; + } + if (out_bytes) { + *out_bytes = out_total; + } +} + +int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes, + unsigned int out_bytes) +{ + unsigned int in_total, out_total; + + virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes); + return in_bytes <= in_total && out_bytes <= out_total; +} + +void virtqueue_map_sg(struct iovec *sg, hwaddr *addr, + size_t num_sg, int is_write) +{ + unsigned int i; + hwaddr len; + + for (i = 0; i < num_sg; i++) { + len = sg[i].iov_len; + sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); + if (sg[i].iov_base == NULL || len != sg[i].iov_len) { + error_report("virtio: trying to map MMIO memory"); + exit(1); + } + } +} + +int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem) +{ + unsigned int i, head, max; + hwaddr desc_pa = vq->vring.desc; + + if (!virtqueue_num_heads(vq, vq->last_avail_idx)) + return 0; + + /* When we start there are none of either input nor output. */ + elem->out_num = elem->in_num = 0; + + max = vq->vring.num; + + i = head = virtqueue_get_head(vq, vq->last_avail_idx++); + if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { + vring_avail_event(vq, vring_avail_idx(vq)); + } + + if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) { + if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { + error_report("Invalid size for indirect buffer table"); + exit(1); + } + + /* loop over the indirect descriptor table */ + max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc); + desc_pa = vring_desc_addr(desc_pa, i); + i = 0; + } + + /* Collect all the descriptors */ + do { + struct iovec *sg; + + if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) { + if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) { + error_report("Too many write descriptors in indirect table"); + exit(1); + } + elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); + sg = &elem->in_sg[elem->in_num++]; + } else { + if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) { + error_report("Too many read descriptors in indirect table"); + exit(1); + } + elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); + sg = &elem->out_sg[elem->out_num++]; + } + + sg->iov_len = vring_desc_len(desc_pa, i); + + /* If we've got too many, that implies a descriptor loop. */ + if ((elem->in_num + elem->out_num) > max) { + error_report("Looped descriptor"); + exit(1); + } + } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max); + + /* Now map what we have collected */ + virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1); + virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0); + + elem->index = head; + + vq->inuse++; + + trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); + return elem->in_num + elem->out_num; +} + +/* virtio device */ +static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) +{ + if (vdev->binding->notify) { + vdev->binding->notify(vdev->binding_opaque, vector); + } +} + +void virtio_update_irq(VirtIODevice *vdev) +{ + virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); +} + +void virtio_set_status(VirtIODevice *vdev, uint8_t val) +{ + trace_virtio_set_status(vdev, val); + + if (vdev->set_status) { + vdev->set_status(vdev, val); + } + vdev->status = val; +} + +void virtio_reset(void *opaque) +{ + VirtIODevice *vdev = opaque; + int i; + + virtio_set_status(vdev, 0); + + if (vdev->reset) + vdev->reset(vdev); + + vdev->guest_features = 0; + vdev->queue_sel = 0; + vdev->status = 0; + vdev->isr = 0; + vdev->config_vector = VIRTIO_NO_VECTOR; + virtio_notify_vector(vdev, vdev->config_vector); + + for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { + vdev->vq[i].vring.desc = 0; + vdev->vq[i].vring.avail = 0; + vdev->vq[i].vring.used = 0; + vdev->vq[i].last_avail_idx = 0; + vdev->vq[i].pa = 0; + vdev->vq[i].vector = VIRTIO_NO_VECTOR; + vdev->vq[i].signalled_used = 0; + vdev->vq[i].signalled_used_valid = false; + vdev->vq[i].notification = true; + } +} + +uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) +{ + uint8_t val; + + vdev->get_config(vdev, vdev->config); + + if (addr > (vdev->config_len - sizeof(val))) + return (uint32_t)-1; + + val = ldub_p(vdev->config + addr); + return val; +} + +uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) +{ + uint16_t val; + + vdev->get_config(vdev, vdev->config); + + if (addr > (vdev->config_len - sizeof(val))) + return (uint32_t)-1; + + val = lduw_p(vdev->config + addr); + return val; +} + +uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) +{ + uint32_t val; + + vdev->get_config(vdev, vdev->config); + + if (addr > (vdev->config_len - sizeof(val))) + return (uint32_t)-1; + + val = ldl_p(vdev->config + addr); + return val; +} + +void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data) +{ + uint8_t val = data; + + if (addr > (vdev->config_len - sizeof(val))) + return; + + stb_p(vdev->config + addr, val); + + if (vdev->set_config) + vdev->set_config(vdev, vdev->config); +} + +void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data) +{ + uint16_t val = data; + + if (addr > (vdev->config_len - sizeof(val))) + return; + + stw_p(vdev->config + addr, val); + + if (vdev->set_config) + vdev->set_config(vdev, vdev->config); +} + +void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data) +{ + uint32_t val = data; + + if (addr > (vdev->config_len - sizeof(val))) + return; + + stl_p(vdev->config + addr, val); + + if (vdev->set_config) + vdev->set_config(vdev, vdev->config); +} + +void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) +{ + vdev->vq[n].pa = addr; + virtqueue_init(&vdev->vq[n]); +} + +hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].pa; +} + +int virtio_queue_get_num(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.num; +} + +int virtio_queue_get_id(VirtQueue *vq) +{ + VirtIODevice *vdev = vq->vdev; + assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]); + return vq - &vdev->vq[0]; +} + +void virtio_queue_notify_vq(VirtQueue *vq) +{ + if (vq->vring.desc) { + VirtIODevice *vdev = vq->vdev; + trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); + vq->handle_output(vdev, vq); + } +} + +void virtio_queue_notify(VirtIODevice *vdev, int n) +{ + virtio_queue_notify_vq(&vdev->vq[n]); +} + +uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) +{ + return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector : + VIRTIO_NO_VECTOR; +} + +void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) +{ + if (n < VIRTIO_PCI_QUEUE_MAX) + vdev->vq[n].vector = vector; +} + +VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, + void (*handle_output)(VirtIODevice *, VirtQueue *)) +{ + int i; + + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { + if (vdev->vq[i].vring.num == 0) + break; + } + + if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE) + abort(); + + vdev->vq[i].vring.num = queue_size; + vdev->vq[i].handle_output = handle_output; + + return &vdev->vq[i]; +} + +void virtio_del_queue(VirtIODevice *vdev, int n) +{ + if (n < 0 || n >= VIRTIO_PCI_QUEUE_MAX) { + abort(); + } + + vdev->vq[n].vring.num = 0; +} + +void virtio_irq(VirtQueue *vq) +{ + trace_virtio_irq(vq); + vq->vdev->isr |= 0x01; + virtio_notify_vector(vq->vdev, vq->vector); +} + +/* Assuming a given event_idx value from the other size, if + * we have just incremented index from old to new_idx, + * should we trigger an event? */ +static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old) +{ + /* Note: Xen has similar logic for notification hold-off + * in include/xen/interface/io/ring.h with req_event and req_prod + * corresponding to event_idx + 1 and new respectively. + * Note also that req_event and req_prod in Xen start at 1, + * event indexes in virtio start at 0. */ + return (uint16_t)(new - event - 1) < (uint16_t)(new - old); +} + +static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) +{ + uint16_t old, new; + bool v; + /* We need to expose used array entries before checking used event. */ + smp_mb(); + /* Always notify when queue is empty (when feature acknowledge) */ + if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && + !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) { + return true; + } + + if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { + return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT); + } + + v = vq->signalled_used_valid; + vq->signalled_used_valid = true; + old = vq->signalled_used; + new = vq->signalled_used = vring_used_idx(vq); + return !v || vring_need_event(vring_used_event(vq), new, old); +} + +void virtio_notify(VirtIODevice *vdev, VirtQueue *vq) +{ + if (!vring_notify(vdev, vq)) { + return; + } + + trace_virtio_notify(vdev, vq); + vdev->isr |= 0x01; + virtio_notify_vector(vdev, vq->vector); +} + +void virtio_notify_config(VirtIODevice *vdev) +{ + if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) + return; + + vdev->isr |= 0x03; + virtio_notify_vector(vdev, vdev->config_vector); +} + +void virtio_save(VirtIODevice *vdev, QEMUFile *f) +{ + int i; + + if (vdev->binding->save_config) + vdev->binding->save_config(vdev->binding_opaque, f); + + qemu_put_8s(f, &vdev->status); + qemu_put_8s(f, &vdev->isr); + qemu_put_be16s(f, &vdev->queue_sel); + qemu_put_be32s(f, &vdev->guest_features); + qemu_put_be32(f, vdev->config_len); + qemu_put_buffer(f, vdev->config, vdev->config_len); + + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { + if (vdev->vq[i].vring.num == 0) + break; + } + + qemu_put_be32(f, i); + + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { + if (vdev->vq[i].vring.num == 0) + break; + + qemu_put_be32(f, vdev->vq[i].vring.num); + qemu_put_be64(f, vdev->vq[i].pa); + qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); + if (vdev->binding->save_queue) + vdev->binding->save_queue(vdev->binding_opaque, i, f); + } +} + +int virtio_set_features(VirtIODevice *vdev, uint32_t val) +{ + uint32_t supported_features = + vdev->binding->get_features(vdev->binding_opaque); + bool bad = (val & ~supported_features) != 0; + + val &= supported_features; + if (vdev->set_features) { + vdev->set_features(vdev, val); + } + vdev->guest_features = val; + return bad ? -1 : 0; +} + +int virtio_load(VirtIODevice *vdev, QEMUFile *f) +{ + int num, i, ret; + uint32_t features; + uint32_t supported_features; + + if (vdev->binding->load_config) { + ret = vdev->binding->load_config(vdev->binding_opaque, f); + if (ret) + return ret; + } + + qemu_get_8s(f, &vdev->status); + qemu_get_8s(f, &vdev->isr); + qemu_get_be16s(f, &vdev->queue_sel); + qemu_get_be32s(f, &features); + + if (virtio_set_features(vdev, features) < 0) { + supported_features = vdev->binding->get_features(vdev->binding_opaque); + error_report("Features 0x%x unsupported. Allowed features: 0x%x", + features, supported_features); + return -1; + } + vdev->config_len = qemu_get_be32(f); + qemu_get_buffer(f, vdev->config, vdev->config_len); + + num = qemu_get_be32(f); + + for (i = 0; i < num; i++) { + vdev->vq[i].vring.num = qemu_get_be32(f); + vdev->vq[i].pa = qemu_get_be64(f); + qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); + vdev->vq[i].signalled_used_valid = false; + vdev->vq[i].notification = true; + + if (vdev->vq[i].pa) { + uint16_t nheads; + virtqueue_init(&vdev->vq[i]); + nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; + /* Check it isn't doing very strange things with descriptor numbers. */ + if (nheads > vdev->vq[i].vring.num) { + error_report("VQ %d size 0x%x Guest index 0x%x " + "inconsistent with Host index 0x%x: delta 0x%x", + i, vdev->vq[i].vring.num, + vring_avail_idx(&vdev->vq[i]), + vdev->vq[i].last_avail_idx, nheads); + return -1; + } + } else if (vdev->vq[i].last_avail_idx) { + error_report("VQ %d address 0x0 " + "inconsistent with Host index 0x%x", + i, vdev->vq[i].last_avail_idx); + return -1; + } + if (vdev->binding->load_queue) { + ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); + if (ret) + return ret; + } + } + + virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); + return 0; +} + +void virtio_common_cleanup(VirtIODevice *vdev) +{ + qemu_del_vm_change_state_handler(vdev->vmstate); + g_free(vdev->config); + g_free(vdev->vq); +} + +void virtio_cleanup(VirtIODevice *vdev) +{ + virtio_common_cleanup(vdev); + g_free(vdev); +} + +static void virtio_vmstate_change(void *opaque, int running, RunState state) +{ + VirtIODevice *vdev = opaque; + bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK); + vdev->vm_running = running; + + if (backend_run) { + virtio_set_status(vdev, vdev->status); + } + + if (vdev->binding->vmstate_change) { + vdev->binding->vmstate_change(vdev->binding_opaque, backend_run); + } + + if (!backend_run) { + virtio_set_status(vdev, vdev->status); + } +} + +void virtio_init(VirtIODevice *vdev, const char *name, + uint16_t device_id, size_t config_size) +{ + int i; + vdev->device_id = device_id; + vdev->status = 0; + vdev->isr = 0; + vdev->queue_sel = 0; + vdev->config_vector = VIRTIO_NO_VECTOR; + vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX); + vdev->vm_running = runstate_is_running(); + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { + vdev->vq[i].vector = VIRTIO_NO_VECTOR; + vdev->vq[i].vdev = vdev; + vdev->vq[i].queue_index = i; + } + + vdev->name = name; + vdev->config_len = config_size; + if (vdev->config_len) { + vdev->config = g_malloc0(config_size); + } else { + vdev->config = NULL; + } + vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, + vdev); +} + +VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, + size_t config_size, size_t struct_size) +{ + VirtIODevice *vdev; + vdev = g_malloc0(struct_size); + virtio_init(vdev, name, device_id, config_size); + return vdev; +} + +void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, + DeviceState *opaque) +{ + vdev->binding = binding; + vdev->binding_opaque = opaque; +} + +hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.desc; +} + +hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.avail; +} + +hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.used; +} + +hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.desc; +} + +hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n) +{ + return sizeof(VRingDesc) * vdev->vq[n].vring.num; +} + +hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n) +{ + return offsetof(VRingAvail, ring) + + sizeof(uint64_t) * vdev->vq[n].vring.num; +} + +hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n) +{ + return offsetof(VRingUsed, ring) + + sizeof(VRingUsedElem) * vdev->vq[n].vring.num; +} + +hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].vring.used - vdev->vq[n].vring.desc + + virtio_queue_get_used_size(vdev, n); +} + +uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n) +{ + return vdev->vq[n].last_avail_idx; +} + +void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) +{ + vdev->vq[n].last_avail_idx = idx; +} + +VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n) +{ + return vdev->vq + n; +} + +uint16_t virtio_get_queue_index(VirtQueue *vq) +{ + return vq->queue_index; +} + +static void virtio_queue_guest_notifier_read(EventNotifier *n) +{ + VirtQueue *vq = container_of(n, VirtQueue, guest_notifier); + if (event_notifier_test_and_clear(n)) { + virtio_irq(vq); + } +} + +void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign, + bool with_irqfd) +{ + if (assign && !with_irqfd) { + event_notifier_set_handler(&vq->guest_notifier, + virtio_queue_guest_notifier_read); + } else { + event_notifier_set_handler(&vq->guest_notifier, NULL); + } + if (!assign) { + /* Test and clear notifier before closing it, + * in case poll callback didn't have time to run. */ + virtio_queue_guest_notifier_read(&vq->guest_notifier); + } +} + +EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) +{ + return &vq->guest_notifier; +} + +static void virtio_queue_host_notifier_read(EventNotifier *n) +{ + VirtQueue *vq = container_of(n, VirtQueue, host_notifier); + if (event_notifier_test_and_clear(n)) { + virtio_queue_notify_vq(vq); + } +} + +void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, + bool set_handler) +{ + if (assign && set_handler) { + event_notifier_set_handler(&vq->host_notifier, + virtio_queue_host_notifier_read); + } else { + event_notifier_set_handler(&vq->host_notifier, NULL); + } + if (!assign) { + /* Test and clear notifier before after disabling event, + * in case poll callback didn't have time to run. */ + virtio_queue_host_notifier_read(&vq->host_notifier); + } +} + +EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) +{ + return &vq->host_notifier; +} + +static int virtio_device_init(DeviceState *qdev) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(qdev); + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(qdev); + assert(k->init != NULL); + if (k->init(vdev) < 0) { + return -1; + } + virtio_bus_plug_device(vdev); + return 0; +} + +static void virtio_device_class_init(ObjectClass *klass, void *data) +{ + /* Set the default value here. */ + DeviceClass *dc = DEVICE_CLASS(klass); + dc->init = virtio_device_init; + dc->bus_type = TYPE_VIRTIO_BUS; +} + +static const TypeInfo virtio_device_info = { + .name = TYPE_VIRTIO_DEVICE, + .parent = TYPE_DEVICE, + .instance_size = sizeof(VirtIODevice), + .class_init = virtio_device_class_init, + .abstract = true, + .class_size = sizeof(VirtioDeviceClass), +}; + +static void virtio_register_types(void) +{ + type_register_static(&virtio_device_info); +} + +type_init(virtio_register_types) |