aboutsummaryrefslogtreecommitdiff
path: root/hw
diff options
context:
space:
mode:
Diffstat (limited to 'hw')
-rw-r--r--hw/virtio.c847
-rw-r--r--hw/virtio.h121
2 files changed, 968 insertions, 0 deletions
diff --git a/hw/virtio.c b/hw/virtio.c
new file mode 100644
index 0000000000..93965800df
--- /dev/null
+++ b/hw/virtio.c
@@ -0,0 +1,847 @@
+/*
+ * 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 <err.h>
+
+#include "virtio.h"
+#include "sysemu.h"
+
+//#define VIRTIO_ZERO_COPY
+
+/* from Linux's linux/virtio_pci.h */
+
+/* A 32-bit r/o bitmask of the features supported by the host */
+#define VIRTIO_PCI_HOST_FEATURES 0
+
+/* A 32-bit r/w bitmask of features activated by the guest */
+#define VIRTIO_PCI_GUEST_FEATURES 4
+
+/* A 32-bit r/w PFN for the currently selected queue */
+#define VIRTIO_PCI_QUEUE_PFN 8
+
+/* A 16-bit r/o queue size for the currently selected queue */
+#define VIRTIO_PCI_QUEUE_NUM 12
+
+/* A 16-bit r/w queue selector */
+#define VIRTIO_PCI_QUEUE_SEL 14
+
+/* A 16-bit r/w queue notifier */
+#define VIRTIO_PCI_QUEUE_NOTIFY 16
+
+/* An 8-bit device status register. */
+#define VIRTIO_PCI_STATUS 18
+
+/* An 8-bit r/o interrupt status register. Reading the value will return the
+ * current contents of the ISR and will also clear it. This is effectively
+ * a read-and-acknowledge. */
+#define VIRTIO_PCI_ISR 19
+
+#define VIRTIO_PCI_CONFIG 20
+
+/* Virtio ABI version, if we increment this, we break the guest driver. */
+#define VIRTIO_PCI_ABI_VERSION 0
+
+/* QEMU doesn't strictly need write barriers since everything runs in
+ * lock-step. We'll leave the calls to wmb() in though to make it obvious for
+ * KVM or if kqemu gets SMP support.
+ */
+#define wmb() do { } while (0)
+
+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;
+ target_phys_addr_t desc;
+ target_phys_addr_t avail;
+ target_phys_addr_t used;
+} VRing;
+
+struct VirtQueue
+{
+ VRing vring;
+ uint32_t pfn;
+ uint16_t last_avail_idx;
+ int inuse;
+ void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
+};
+
+#define VIRTIO_PCI_QUEUE_MAX 16
+
+/* virt queue functions */
+#ifdef VIRTIO_ZERO_COPY
+static void *virtio_map_gpa(target_phys_addr_t addr, size_t size)
+{
+ ram_addr_t off;
+ target_phys_addr_t addr1;
+
+ off = cpu_get_physical_page_desc(addr);
+ if ((off & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
+ fprintf(stderr, "virtio DMA to IO ram\n");
+ exit(1);
+ }
+
+ off = (off & TARGET_PAGE_MASK) | (addr & ~TARGET_PAGE_MASK);
+
+ for (addr1 = addr + TARGET_PAGE_SIZE;
+ addr1 < TARGET_PAGE_ALIGN(addr + size);
+ addr1 += TARGET_PAGE_SIZE) {
+ ram_addr_t off1;
+
+ off1 = cpu_get_physical_page_desc(addr1);
+ if ((off1 & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
+ fprintf(stderr, "virtio DMA to IO ram\n");
+ exit(1);
+ }
+
+ off1 = (off1 & TARGET_PAGE_MASK) | (addr1 & ~TARGET_PAGE_MASK);
+
+ if (off1 != (off + (addr1 - addr))) {
+ fprintf(stderr, "discontigous virtio memory\n");
+ exit(1);
+ }
+ }
+
+ return phys_ram_base + off;
+}
+#endif
+
+static void virtqueue_init(VirtQueue *vq, target_phys_addr_t pa)
+{
+ vq->vring.desc = pa;
+ vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
+ vq->vring.used = TARGET_PAGE_ALIGN(vq->vring.avail + offsetof(VRingAvail, ring[vq->vring.num]));
+}
+
+static inline uint64_t vring_desc_addr(VirtQueue *vq, int i)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
+ return ldq_phys(pa);
+}
+
+static inline uint32_t vring_desc_len(VirtQueue *vq, int i)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
+ return ldl_phys(pa);
+}
+
+static inline uint16_t vring_desc_flags(VirtQueue *vq, int i)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
+ return lduw_phys(pa);
+}
+
+static inline uint16_t vring_desc_next(VirtQueue *vq, int i)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
+ return lduw_phys(pa);
+}
+
+static inline uint16_t vring_avail_flags(VirtQueue *vq)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.avail + offsetof(VRingAvail, flags);
+ return lduw_phys(pa);
+}
+
+static inline uint16_t vring_avail_idx(VirtQueue *vq)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.avail + offsetof(VRingAvail, idx);
+ return lduw_phys(pa);
+}
+
+static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
+ return lduw_phys(pa);
+}
+
+static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val)
+{
+ target_phys_addr_t 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)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.used + offsetof(VRingUsed, ring[i].len);
+ stl_phys(pa, val);
+}
+
+static uint16_t vring_used_idx(VirtQueue *vq)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.used + offsetof(VRingUsed, idx);
+ return lduw_phys(pa);
+}
+
+static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.used + offsetof(VRingUsed, idx);
+ stw_phys(pa, vring_used_idx(vq) + val);
+}
+
+static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
+{
+ target_phys_addr_t 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)
+{
+ target_phys_addr_t pa;
+ pa = vq->vring.used + offsetof(VRingUsed, flags);
+ stw_phys(pa, lduw_phys(pa) & ~mask);
+}
+
+void virtio_queue_set_notification(VirtQueue *vq, int enable)
+{
+ 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);
+}
+
+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;
+
+#ifndef VIRTIO_ZERO_COPY
+ for (i = 0; i < elem->out_num; i++)
+ qemu_free(elem->out_sg[i].iov_base);
+#endif
+
+ offset = 0;
+ for (i = 0; i < elem->in_num; i++) {
+ size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
+
+#ifdef VIRTIO_ZERO_COPY
+ if (size) {
+ ram_addr_t addr = (uint8_t *)elem->in_sg[i].iov_base - phys_ram_base;
+ ram_addr_t off;
+
+ for (off = 0; off < size; off += TARGET_PAGE_SIZE)
+ cpu_physical_memory_set_dirty(addr + off);
+ }
+#else
+ if (size)
+ cpu_physical_memory_write(elem->in_addr[i],
+ elem->in_sg[i].iov_base,
+ size);
+
+ qemu_free(elem->in_sg[i].iov_base);
+#endif
+
+ offset += size;
+ }
+
+ 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)
+{
+ /* Make sure buffer is written before we update index. */
+ wmb();
+ vring_used_idx_increment(vq, count);
+ vq->inuse -= count;
+}
+
+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)
+ errx(1, "Guest moved used index from %u to %u",
+ idx, vring_avail_idx(vq));
+
+ 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)
+ errx(1, "Guest says index %u is available", head);
+
+ return head;
+}
+
+static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i)
+{
+ unsigned int next;
+
+ /* If this descriptor says it doesn't chain, we're done. */
+ if (!(vring_desc_flags(vq, i) & VRING_DESC_F_NEXT))
+ return vq->vring.num;
+
+ /* Check they're not leading us off end of descriptors. */
+ next = vring_desc_next(vq, i);
+ /* Make sure compiler knows to grab that: we don't want it changing! */
+ wmb();
+
+ if (next >= vq->vring.num)
+ errx(1, "Desc next is %u", next);
+
+ return next;
+}
+
+int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes)
+{
+ unsigned int idx;
+ int num_bufs, in_total, out_total;
+
+ idx = vq->last_avail_idx;
+
+ num_bufs = in_total = out_total = 0;
+ while (virtqueue_num_heads(vq, idx)) {
+ int i;
+
+ i = virtqueue_get_head(vq, idx++);
+ do {
+ /* If we've got too many, that implies a descriptor loop. */
+ if (++num_bufs > vq->vring.num)
+ errx(1, "Looped descriptor");
+
+ if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
+ if (in_bytes > 0 &&
+ (in_total += vring_desc_len(vq, i)) >= in_bytes)
+ return 1;
+ } else {
+ if (out_bytes > 0 &&
+ (out_total += vring_desc_len(vq, i)) >= out_bytes)
+ return 1;
+ }
+ } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
+ }
+
+ return 0;
+}
+
+int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
+{
+ unsigned int i, head;
+
+ 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;
+
+ i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
+ do {
+ struct iovec *sg;
+
+ if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
+ elem->in_addr[elem->in_num] = vring_desc_addr(vq, i);
+ sg = &elem->in_sg[elem->in_num++];
+ } else
+ sg = &elem->out_sg[elem->out_num++];
+
+ /* Grab the first descriptor, and check it's OK. */
+ sg->iov_len = vring_desc_len(vq, i);
+
+#ifdef VIRTIO_ZERO_COPY
+ sg->iov_base = virtio_map_gpa(vring_desc_addr(vq, i), sg->iov_len);
+#else
+ /* cap individual scatter element size to prevent unbounded allocations
+ of memory from the guest. Practically speaking, no virtio driver
+ will ever pass more than a page in each element. We set the cap to
+ be 2MB in case for some reason a large page makes it way into the
+ sg list. When we implement a zero copy API, this limitation will
+ disappear */
+ if (sg->iov_len > (2 << 20))
+ sg->iov_len = 2 << 20;
+
+ sg->iov_base = qemu_malloc(sg->iov_len);
+ if (sg->iov_base &&
+ !(vring_desc_flags(vq, i) & VRING_DESC_F_WRITE)) {
+ cpu_physical_memory_read(vring_desc_addr(vq, i),
+ sg->iov_base,
+ sg->iov_len);
+ }
+#endif
+ if (sg->iov_base == NULL)
+ errx(1, "Invalid mapping\n");
+
+ /* If we've got too many, that implies a descriptor loop. */
+ if ((elem->in_num + elem->out_num) > vq->vring.num)
+ errx(1, "Looped descriptor");
+ } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
+
+ elem->index = head;
+
+ vq->inuse++;
+
+ return elem->in_num + elem->out_num;
+}
+
+/* virtio device */
+
+static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
+{
+ return (VirtIODevice *)pci_dev;
+}
+
+static void virtio_update_irq(VirtIODevice *vdev)
+{
+ qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1);
+}
+
+void virtio_reset(void *opaque)
+{
+ VirtIODevice *vdev = opaque;
+ int i;
+
+ if (vdev->reset)
+ vdev->reset(vdev);
+
+ vdev->features = 0;
+ vdev->queue_sel = 0;
+ vdev->status = 0;
+ vdev->isr = 0;
+ virtio_update_irq(vdev);
+
+ 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].pfn = 0;
+ }
+}
+
+static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
+{
+ VirtIODevice *vdev = to_virtio_device(opaque);
+ ram_addr_t pa;
+
+ addr -= vdev->addr;
+
+ switch (addr) {
+ case VIRTIO_PCI_GUEST_FEATURES:
+ if (vdev->set_features)
+ vdev->set_features(vdev, val);
+ vdev->features = val;
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ pa = (ram_addr_t)val << TARGET_PAGE_BITS;
+ vdev->vq[vdev->queue_sel].pfn = val;
+ if (pa == 0) {
+ virtio_reset(vdev);
+ } else {
+ virtqueue_init(&vdev->vq[vdev->queue_sel], pa);
+ }
+ break;
+ case VIRTIO_PCI_QUEUE_SEL:
+ if (val < VIRTIO_PCI_QUEUE_MAX)
+ vdev->queue_sel = val;
+ break;
+ case VIRTIO_PCI_QUEUE_NOTIFY:
+ if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
+ vdev->vq[val].handle_output(vdev, &vdev->vq[val]);
+ break;
+ case VIRTIO_PCI_STATUS:
+ vdev->status = val & 0xFF;
+ if (vdev->status == 0)
+ virtio_reset(vdev);
+ break;
+ }
+}
+
+static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
+{
+ VirtIODevice *vdev = to_virtio_device(opaque);
+ uint32_t ret = 0xFFFFFFFF;
+
+ addr -= vdev->addr;
+
+ switch (addr) {
+ case VIRTIO_PCI_HOST_FEATURES:
+ ret = vdev->get_features(vdev);
+ ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+ break;
+ case VIRTIO_PCI_GUEST_FEATURES:
+ ret = vdev->features;
+ break;
+ case VIRTIO_PCI_QUEUE_PFN:
+ ret = vdev->vq[vdev->queue_sel].pfn;
+ break;
+ case VIRTIO_PCI_QUEUE_NUM:
+ ret = vdev->vq[vdev->queue_sel].vring.num;
+ break;
+ case VIRTIO_PCI_QUEUE_SEL:
+ ret = vdev->queue_sel;
+ break;
+ case VIRTIO_PCI_STATUS:
+ ret = vdev->status;
+ break;
+ case VIRTIO_PCI_ISR:
+ /* reading from the ISR also clears it. */
+ ret = vdev->isr;
+ vdev->isr = 0;
+ virtio_update_irq(vdev);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static uint32_t virtio_config_readb(void *opaque, uint32_t addr)
+{
+ VirtIODevice *vdev = opaque;
+ uint8_t val;
+
+ vdev->get_config(vdev, vdev->config);
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return (uint32_t)-1;
+
+ memcpy(&val, vdev->config + addr, sizeof(val));
+ return val;
+}
+
+static uint32_t virtio_config_readw(void *opaque, uint32_t addr)
+{
+ VirtIODevice *vdev = opaque;
+ uint16_t val;
+
+ vdev->get_config(vdev, vdev->config);
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return (uint32_t)-1;
+
+ memcpy(&val, vdev->config + addr, sizeof(val));
+ return val;
+}
+
+static uint32_t virtio_config_readl(void *opaque, uint32_t addr)
+{
+ VirtIODevice *vdev = opaque;
+ uint32_t val;
+
+ vdev->get_config(vdev, vdev->config);
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return (uint32_t)-1;
+
+ memcpy(&val, vdev->config + addr, sizeof(val));
+ return val;
+}
+
+static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data)
+{
+ VirtIODevice *vdev = opaque;
+ uint8_t val = data;
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return;
+
+ memcpy(vdev->config + addr, &val, sizeof(val));
+
+ if (vdev->set_config)
+ vdev->set_config(vdev, vdev->config);
+}
+
+static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data)
+{
+ VirtIODevice *vdev = opaque;
+ uint16_t val = data;
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return;
+
+ memcpy(vdev->config + addr, &val, sizeof(val));
+
+ if (vdev->set_config)
+ vdev->set_config(vdev, vdev->config);
+}
+
+static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data)
+{
+ VirtIODevice *vdev = opaque;
+ uint32_t val = data;
+
+ addr -= vdev->addr + VIRTIO_PCI_CONFIG;
+ if (addr > (vdev->config_len - sizeof(val)))
+ return;
+
+ memcpy(vdev->config + addr, &val, sizeof(val));
+
+ if (vdev->set_config)
+ vdev->set_config(vdev, vdev->config);
+}
+
+static void virtio_map(PCIDevice *pci_dev, int region_num,
+ uint32_t addr, uint32_t size, int type)
+{
+ VirtIODevice *vdev = to_virtio_device(pci_dev);
+ int i;
+
+ vdev->addr = addr;
+ for (i = 0; i < 3; i++) {
+ register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev);
+ register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev);
+ }
+
+ if (vdev->config_len) {
+ register_ioport_write(addr + 20, vdev->config_len, 1,
+ virtio_config_writeb, vdev);
+ register_ioport_write(addr + 20, vdev->config_len, 2,
+ virtio_config_writew, vdev);
+ register_ioport_write(addr + 20, vdev->config_len, 4,
+ virtio_config_writel, vdev);
+ register_ioport_read(addr + 20, vdev->config_len, 1,
+ virtio_config_readb, vdev);
+ register_ioport_read(addr + 20, vdev->config_len, 2,
+ virtio_config_readw, vdev);
+ register_ioport_read(addr + 20, vdev->config_len, 4,
+ virtio_config_readl, vdev);
+
+ vdev->get_config(vdev, vdev->config);
+ }
+}
+
+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_notify(VirtIODevice *vdev, VirtQueue *vq)
+{
+ /* Always notify when queue is empty */
+ if ((vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx) &&
+ (vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT))
+ return;
+
+ vdev->isr |= 0x01;
+ virtio_update_irq(vdev);
+}
+
+void virtio_notify_config(VirtIODevice *vdev)
+{
+ vdev->isr |= 0x03;
+ virtio_update_irq(vdev);
+}
+
+void virtio_save(VirtIODevice *vdev, QEMUFile *f)
+{
+ int i;
+
+ pci_device_save(&vdev->pci_dev, f);
+
+ qemu_put_be32s(f, &vdev->addr);
+ qemu_put_8s(f, &vdev->status);
+ qemu_put_8s(f, &vdev->isr);
+ qemu_put_be16s(f, &vdev->queue_sel);
+ qemu_put_be32s(f, &vdev->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_be32s(f, &vdev->vq[i].pfn);
+ qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
+ }
+}
+
+void virtio_load(VirtIODevice *vdev, QEMUFile *f)
+{
+ int num, i;
+
+ pci_device_load(&vdev->pci_dev, f);
+
+ qemu_get_be32s(f, &vdev->addr);
+ qemu_get_8s(f, &vdev->status);
+ qemu_get_8s(f, &vdev->isr);
+ qemu_get_be16s(f, &vdev->queue_sel);
+ qemu_get_be32s(f, &vdev->features);
+ 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);
+ qemu_get_be32s(f, &vdev->vq[i].pfn);
+ qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
+
+ if (vdev->vq[i].pfn) {
+ target_phys_addr_t pa;
+
+ pa = (ram_addr_t)vdev->vq[i].pfn << TARGET_PAGE_BITS;
+ virtqueue_init(&vdev->vq[i], pa);
+ }
+ }
+
+ virtio_update_irq(vdev);
+}
+
+VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
+ uint16_t vendor, uint16_t device,
+ uint16_t subvendor, uint16_t subdevice,
+ uint8_t class_code, uint8_t subclass_code,
+ uint8_t pif, size_t config_size,
+ size_t struct_size)
+{
+ VirtIODevice *vdev;
+ PCIDevice *pci_dev;
+ uint8_t *config;
+ uint32_t size;
+
+ pci_dev = pci_register_device(bus, name, struct_size,
+ -1, NULL, NULL);
+ if (!pci_dev)
+ return NULL;
+
+ vdev = to_virtio_device(pci_dev);
+
+ vdev->status = 0;
+ vdev->isr = 0;
+ vdev->queue_sel = 0;
+ vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
+
+ config = pci_dev->config;
+ config[0x00] = vendor & 0xFF;
+ config[0x01] = (vendor >> 8) & 0xFF;
+ config[0x02] = device & 0xFF;
+ config[0x03] = (device >> 8) & 0xFF;
+
+ config[0x08] = VIRTIO_PCI_ABI_VERSION;
+
+ config[0x09] = pif;
+ config[0x0a] = subclass_code;
+ config[0x0b] = class_code;
+ config[0x0e] = 0x00;
+
+ config[0x2c] = subvendor & 0xFF;
+ config[0x2d] = (subvendor >> 8) & 0xFF;
+ config[0x2e] = subdevice & 0xFF;
+ config[0x2f] = (subdevice >> 8) & 0xFF;
+
+ config[0x3d] = 1;
+
+ vdev->name = name;
+ vdev->config_len = config_size;
+ if (vdev->config_len)
+ vdev->config = qemu_mallocz(config_size);
+ else
+ vdev->config = NULL;
+
+ size = 20 + config_size;
+ if (size & (size-1))
+ size = 1 << fls(size);
+
+ pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
+ virtio_map);
+ qemu_register_reset(virtio_reset, vdev);
+
+ return vdev;
+}
diff --git a/hw/virtio.h b/hw/virtio.h
new file mode 100644
index 0000000000..f04e75f887
--- /dev/null
+++ b/hw/virtio.h
@@ -0,0 +1,121 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef _QEMU_VIRTIO_H
+#define _QEMU_VIRTIO_H
+
+#include <sys/uio.h>
+#include "hw.h"
+#include "pci.h"
+
+/* from Linux's linux/virtio_config.h */
+
+/* Status byte for guest to report progress, and synchronize features. */
+/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
+#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
+/* We have found a driver for the device. */
+#define VIRTIO_CONFIG_S_DRIVER 2
+/* Driver has used its parts of the config, and is happy */
+#define VIRTIO_CONFIG_S_DRIVER_OK 4
+/* We've given up on this device. */
+#define VIRTIO_CONFIG_S_FAILED 0x80
+
+/* We notify when the ring is completely used, even if the guest is supressing
+ * callbacks */
+#define VIRTIO_F_NOTIFY_ON_EMPTY 24
+
+/* from Linux's linux/virtio_ring.h */
+
+/* This marks a buffer as continuing via the next field. */
+#define VRING_DESC_F_NEXT 1
+/* This marks a buffer as write-only (otherwise read-only). */
+#define VRING_DESC_F_WRITE 2
+
+/* This means don't notify other side when buffer added. */
+#define VRING_USED_F_NO_NOTIFY 1
+/* This means don't interrupt guest when buffer consumed. */
+#define VRING_AVAIL_F_NO_INTERRUPT 1
+
+struct VirtQueue;
+
+typedef struct VirtQueue VirtQueue;
+typedef struct VirtIODevice VirtIODevice;
+
+#define VIRTQUEUE_MAX_SIZE 1024
+
+typedef struct VirtQueueElement
+{
+ unsigned int index;
+ unsigned int out_num;
+ unsigned int in_num;
+ target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
+ struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
+ struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
+} VirtQueueElement;
+
+#define VIRTIO_PCI_QUEUE_MAX 16
+
+struct VirtIODevice
+{
+ PCIDevice pci_dev;
+ const char *name;
+ uint32_t addr;
+ uint8_t status;
+ uint8_t isr;
+ uint16_t queue_sel;
+ uint32_t features;
+ size_t config_len;
+ void *config;
+ uint32_t (*get_features)(VirtIODevice *vdev);
+ void (*set_features)(VirtIODevice *vdev, uint32_t val);
+ void (*get_config)(VirtIODevice *vdev, uint8_t *config);
+ void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
+ void (*reset)(VirtIODevice *vdev);
+ VirtQueue *vq;
+};
+
+VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
+ uint16_t vendor, uint16_t device,
+ uint16_t subvendor, uint16_t subdevice,
+ uint8_t class_code, uint8_t subclass_code,
+ uint8_t pif, size_t config_size,
+ size_t struct_size);
+
+VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
+ void (*handle_output)(VirtIODevice *,
+ VirtQueue *));
+
+void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len);
+void virtqueue_flush(VirtQueue *vq, unsigned int count);
+void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
+ unsigned int len, unsigned int idx);
+
+int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
+int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
+
+void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
+
+void virtio_save(VirtIODevice *vdev, QEMUFile *f);
+
+void virtio_load(VirtIODevice *vdev, QEMUFile *f);
+
+void virtio_notify_config(VirtIODevice *vdev);
+
+void virtio_queue_set_notification(VirtQueue *vq, int enable);
+
+int virtio_queue_ready(VirtQueue *vq);
+
+int virtio_queue_empty(VirtQueue *vq);
+
+#endif
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-17 22:00:42 +0000