diff options
Diffstat (limited to 'hw/virtio.c')
| -rw-r--r-- | hw/virtio.c | 1121 |
1 files changed, 0 insertions, 1121 deletions
diff --git a/hw/virtio.c b/hw/virtio.c deleted file mode 100644 index 26fbc790ec..0000000000 --- a/hw/virtio.c +++ /dev/null @@ -1,1121 +0,0 @@ -/* - * 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.h" -#include "qemu/atomic.h" -#include "hw/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) |