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libqos: access VIRTIO 1.0 vring in little-endian 

VIRTIO 1.0 uses little-endian for the vring.  Legacy VIRTIO uses guest
endianness.  Adjust the code to handle both.

Note that qvirtio_readq() is not defined because it has no users.  All
the other accessors are really needed.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20191023100425.12168-10-stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-10-23 11:04:18 +01:00 committed by Michael S. Tsirkin
parent c0f79698ed
commit bccd82b407
5 changed files with 106 additions and 39 deletions
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1
tests/libqos/virtio-mmio.c
View File

@ -157,6 +157,7 @@ static QVirtQueue *qvirtio_mmio_virtqueue_setup(QVirtioDevice *d,
uint64_t addr;
vq = g_malloc0(sizeof(*vq));
vq->vdev = d;
qvirtio_mmio_queue_select(d, index);
qtest_writel(dev->qts, dev->addr + QVIRTIO_MMIO_QUEUE_ALIGN, dev->page_size);

1
tests/libqos/virtio-pci.c
View File

@ -217,6 +217,7 @@ static QVirtQueue *qvirtio_pci_virtqueue_setup(QVirtioDevice *d,
feat = qvirtio_pci_get_guest_features(d);
qvirtio_pci_queue_select(d, index);
vqpci->vq.vdev = d;
vqpci->vq.index = index;
vqpci->vq.size = qvirtio_pci_get_queue_size(d);
vqpci->vq.free_head = 0;

131
tests/libqos/virtio.c
View File

@ -8,11 +8,68 @@
*/
#include "qemu/osdep.h"
#include "qemu/bswap.h"
#include "libqtest.h"
#include "libqos/virtio.h"
#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"
/*
* qtest_readX/writeX() functions transfer host endian from/to guest endian.
* This works great for Legacy VIRTIO devices where we need guest endian
* accesses. For VIRTIO 1.0 the vring is little-endian so the automatic guest
* endianness conversion is not wanted.
*
* The following qvirtio_readX/writeX() functions handle Legacy and VIRTIO 1.0
* accesses seamlessly.
*/
static uint16_t qvirtio_readw(QVirtioDevice *d, QTestState *qts, uint64_t addr)
{
uint16_t val = qtest_readw(qts, addr);
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap16(val);
}
return val;
}
static uint32_t qvirtio_readl(QVirtioDevice *d, QTestState *qts, uint64_t addr)
{
uint32_t val = qtest_readl(qts, addr);
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap32(val);
}
return val;
}
static void qvirtio_writew(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint16_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap16(val);
}
qtest_writew(qts, addr, val);
}
static void qvirtio_writel(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint32_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap32(val);
}
qtest_writel(qts, addr, val);
}
static void qvirtio_writeq(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint64_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap64(val);
}
qtest_writeq(qts, addr, val);
}
uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
{
g_assert_true(d->features_negotiated);
@ -189,23 +246,23 @@ void qvring_init(QTestState *qts, const QGuestAllocator *alloc, QVirtQueue *vq,
for (i = 0; i < vq->size - 1; i++) {
/* vq->desc[i].addr */
qtest_writeq(qts, vq->desc + (16 * i), 0);
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * i), 0);
/* vq->desc[i].next */
qtest_writew(qts, vq->desc + (16 * i) + 14, i + 1);
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * i) + 14, i + 1);
}
/* vq->avail->flags */
qtest_writew(qts, vq->avail, 0);
qvirtio_writew(vq->vdev, qts, vq->avail, 0);
/* vq->avail->idx */
qtest_writew(qts, vq->avail + 2, 0);
qvirtio_writew(vq->vdev, qts, vq->avail + 2, 0);
/* vq->avail->used_event */
qtest_writew(qts, vq->avail + 4 + (2 * vq->size), 0);
qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), 0);
/* vq->used->flags */
qtest_writew(qts, vq->used, 0);
qvirtio_writew(vq->vdev, qts, vq->used, 0);
/* vq->used->avail_event */
qtest_writew(qts, vq->used + 2 + sizeof(struct vring_used_elem) * vq->size,
0);
qvirtio_writew(vq->vdev, qts, vq->used + 2 +
sizeof(struct vring_used_elem) * vq->size, 0);
}
QVRingIndirectDesc *qvring_indirect_desc_setup(QTestState *qs, QVirtioDevice *d,
@ -221,35 +278,39 @@ QVRingIndirectDesc *qvring_indirect_desc_setup(QTestState *qs, QVirtioDevice *d,
for (i = 0; i < elem - 1; ++i) {
/* indirect->desc[i].addr */
qtest_writeq(qs, indirect->desc + (16 * i), 0);
qvirtio_writeq(d, qs, indirect->desc + (16 * i), 0);
/* indirect->desc[i].flags */
qtest_writew(qs, indirect->desc + (16 * i) + 12, VRING_DESC_F_NEXT);
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 12,
VRING_DESC_F_NEXT);
/* indirect->desc[i].next */
qtest_writew(qs, indirect->desc + (16 * i) + 14, i + 1);
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 14, i + 1);
}
return indirect;
}
void qvring_indirect_desc_add(QTestState *qts, QVRingIndirectDesc *indirect,
void qvring_indirect_desc_add(QVirtioDevice *d, QTestState *qts,
QVRingIndirectDesc *indirect,
uint64_t data, uint32_t len, bool write)
{
uint16_t flags;
g_assert_cmpint(indirect->index, <, indirect->elem);
flags = qtest_readw(qts, indirect->desc + (16 * indirect->index) + 12);
flags = qvirtio_readw(d, qts, indirect->desc +
(16 * indirect->index) + 12);
if (write) {
flags |= VRING_DESC_F_WRITE;
}
/* indirect->desc[indirect->index].addr */
qtest_writeq(qts, indirect->desc + (16 * indirect->index), data);
qvirtio_writeq(d, qts, indirect->desc + (16 * indirect->index), data);
/* indirect->desc[indirect->index].len */
qtest_writel(qts, indirect->desc + (16 * indirect->index) + 8, len);
qvirtio_writel(d, qts, indirect->desc + (16 * indirect->index) + 8, len);
/* indirect->desc[indirect->index].flags */
qtest_writew(qts, indirect->desc + (16 * indirect->index) + 12, flags);
qvirtio_writew(d, qts, indirect->desc + (16 * indirect->index) + 12,
flags);
indirect->index++;
}
@ -269,11 +330,11 @@ uint32_t qvirtqueue_add(QTestState *qts, QVirtQueue *vq, uint64_t data,
}
/* vq->desc[vq->free_head].addr */
qtest_writeq(qts, vq->desc + (16 * vq->free_head), data);
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head), data);
/* vq->desc[vq->free_head].len */
qtest_writel(qts, vq->desc + (16 * vq->free_head) + 8, len);
qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8, len);
/* vq->desc[vq->free_head].flags */
qtest_writew(qts, vq->desc + (16 * vq->free_head) + 12, flags);
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12, flags);
return vq->free_head++; /* Return and increase, in this order */
}
@ -288,13 +349,14 @@ uint32_t qvirtqueue_add_indirect(QTestState *qts, QVirtQueue *vq,
vq->num_free--;
/* vq->desc[vq->free_head].addr */
qtest_writeq(qts, vq->desc + (16 * vq->free_head), indirect->desc);
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head),
indirect->desc);
/* vq->desc[vq->free_head].len */
qtest_writel(qts, vq->desc + (16 * vq->free_head) + 8,
sizeof(struct vring_desc) * indirect->elem);
qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8,
sizeof(struct vring_desc) * indirect->elem);
/* vq->desc[vq->free_head].flags */
qtest_writew(qts, vq->desc + (16 * vq->free_head) + 12,
VRING_DESC_F_INDIRECT);
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12,
VRING_DESC_F_INDIRECT);
return vq->free_head++; /* Return and increase, in this order */
}
@ -303,21 +365,21 @@ void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq,
uint32_t free_head)
{
/* vq->avail->idx */
uint16_t idx = qtest_readw(qts, vq->avail + 2);
uint16_t idx = qvirtio_readw(d, qts, vq->avail + 2);
/* vq->used->flags */
uint16_t flags;
/* vq->used->avail_event */
uint16_t avail_event;
/* vq->avail->ring[idx % vq->size] */
qtest_writew(qts, vq->avail + 4 + (2 * (idx % vq->size)), free_head);
qvirtio_writew(d, qts, vq->avail + 4 + (2 * (idx % vq->size)), free_head);
/* vq->avail->idx */
qtest_writew(qts, vq->avail + 2, idx + 1);
qvirtio_writew(d, qts, vq->avail + 2, idx + 1);
/* Must read after idx is updated */
flags = qtest_readw(qts, vq->avail);
avail_event = qtest_readw(qts, vq->used + 4 +
sizeof(struct vring_used_elem) * vq->size);
flags = qvirtio_readw(d, qts, vq->avail);
avail_event = qvirtio_readw(d, qts, vq->used + 4 +
sizeof(struct vring_used_elem) * vq->size);
/* < 1 because we add elements to avail queue one by one */
if ((flags & VRING_USED_F_NO_NOTIFY) == 0 &&
@ -342,7 +404,8 @@ bool qvirtqueue_get_buf(QTestState *qts, QVirtQueue *vq, uint32_t *desc_idx,
uint16_t idx;
uint64_t elem_addr, addr;
idx = qtest_readw(qts, vq->used + offsetof(struct vring_used, idx));
idx = qvirtio_readw(vq->vdev, qts,
vq->used + offsetof(struct vring_used, idx));
if (idx == vq->last_used_idx) {
return false;
}
@ -354,12 +417,12 @@ bool qvirtqueue_get_buf(QTestState *qts, QVirtQueue *vq, uint32_t *desc_idx,
if (desc_idx) {
addr = elem_addr + offsetof(struct vring_used_elem, id);
*desc_idx = qtest_readl(qts, addr);
*desc_idx = qvirtio_readl(vq->vdev, qts, addr);
}
if (len) {
addr = elem_addr + offsetof(struct vring_used_elem, len);
*len = qtest_readw(qts, addr);
*len = qvirtio_readw(vq->vdev, qts, addr);
}
vq->last_used_idx++;
@ -371,7 +434,7 @@ void qvirtqueue_set_used_event(QTestState *qts, QVirtQueue *vq, uint16_t idx)
g_assert(vq->event);
/* vq->avail->used_event */
qtest_writew(qts, vq->avail + 4 + (2 * vq->size), idx);
qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), idx);
}
void qvirtio_start_device(QVirtioDevice *vdev)

4
tests/libqos/virtio.h
View File

@ -27,6 +27,7 @@ typedef struct QVirtioDevice {
} QVirtioDevice;
typedef struct QVirtQueue {
QVirtioDevice *vdev;
uint64_t desc; /* This points to an array of struct vring_desc */
uint64_t avail; /* This points to a struct vring_avail */
uint64_t used; /* This points to a struct vring_used */
@ -135,7 +136,8 @@ void qvring_init(QTestState *qts, const QGuestAllocator *alloc, QVirtQueue *vq,
QVRingIndirectDesc *qvring_indirect_desc_setup(QTestState *qs, QVirtioDevice *d,
QGuestAllocator *alloc,
uint16_t elem);
void qvring_indirect_desc_add(QTestState *qts, QVRingIndirectDesc *indirect,
void qvring_indirect_desc_add(QVirtioDevice *d, QTestState *qts,
QVRingIndirectDesc *indirect,
uint64_t data, uint32_t len, bool write);
uint32_t qvirtqueue_add(QTestState *qts, QVirtQueue *vq, uint64_t data,
uint32_t len, bool write, bool next);

8
tests/virtio-blk-test.c
View File

@ -388,8 +388,8 @@ static void indirect(void *obj, void *u_data, QGuestAllocator *t_alloc)
g_free(req.data);
indirect = qvring_indirect_desc_setup(qts, dev, t_alloc, 2);
qvring_indirect_desc_add(qts, indirect, req_addr, 528, false);
qvring_indirect_desc_add(qts, indirect, req_addr + 528, 1, true);
qvring_indirect_desc_add(dev, qts, indirect, req_addr, 528, false);
qvring_indirect_desc_add(dev, qts, indirect, req_addr + 528, 1, true);
free_head = qvirtqueue_add_indirect(qts, vq, indirect);
qvirtqueue_kick(qts, dev, vq, free_head);
@ -413,8 +413,8 @@ static void indirect(void *obj, void *u_data, QGuestAllocator *t_alloc)
g_free(req.data);
indirect = qvring_indirect_desc_setup(qts, dev, t_alloc, 2);
qvring_indirect_desc_add(qts, indirect, req_addr, 16, false);
qvring_indirect_desc_add(qts, indirect, req_addr + 16, 513, true);
qvring_indirect_desc_add(dev, qts, indirect, req_addr, 16, false);
qvring_indirect_desc_add(dev, qts, indirect, req_addr + 16, 513, true);
free_head = qvirtqueue_add_indirect(qts, vq, indirect);
qvirtqueue_kick(qts, dev, vq, free_head);