#define _GNU_SOURCE#include <getopt.h>#include <string.h>#include <poll.h>#include <sys/eventfd.h>#include <stdlib.h>#include <assert.h>#include <unistd.h>#include <sys/ioctl.h>#include <sys/stat.h>#include <sys/types.h>#include <fcntl.h>#include <linux/vhost.h>#include <linux/virtio.h>#include <linux/virtio_ring.h>#include "../../drivers/vhost/test.h" struct vq_info {	int kick;	int call;	int num;	int idx;	void *ring;	/* copy used for control */	struct vring vring;	struct virtqueue *vq;}; struct vdev_info {	struct virtio_device vdev;	int control;	struct pollfd fds[1];	struct vq_info vqs[1];	int nvqs;	void *buf;	size_t buf_size;	struct vhost_memory *mem;}; void vq_notify(struct virtqueue *vq){	struct vq_info *info = vq->priv;	unsigned long long v = 1;	int r;	r = write(info->kick, &v, sizeof v);	assert(r == sizeof v);} void vq_callback(struct virtqueue *vq){}  void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info){	struct vhost_vring_state state = { .index = info->idx };	struct vhost_vring_file file = { .index = info->idx };	unsigned long long features = dev->vdev.features[0];	struct vhost_vring_addr addr = {		.index = info->idx,		.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,		.avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,		.used_user_addr = (uint64_t)(unsigned long)info->vring.used,	};	int r;	r = ioctl(dev->control, VHOST_SET_FEATURES, &features);	assert(r >= 0);	state.num = info->vring.num;	r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);	assert(r >= 0);	state.num = 0;	r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);	assert(r >= 0);	r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);	assert(r >= 0);	file.fd = info->kick;	r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);	assert(r >= 0);	file.fd = info->call;	r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);	assert(r >= 0);} static void vq_info_add(struct vdev_info *dev, int num){	struct vq_info *info = &dev->vqs[dev->nvqs];	int r;	info->idx = dev->nvqs;	info->kick = eventfd(0, EFD_NONBLOCK);	info->call = eventfd(0, EFD_NONBLOCK);	r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));	assert(r >= 0);	memset(info->ring, 0, vring_size(num, 4096));	vring_init(&info->vring, num, info->ring, 4096);	info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev,				       true, info->ring,				       vq_notify, vq_callback, "test");	assert(info->vq);	info->vq->priv = info;	vhost_vq_setup(dev, info);	dev->fds[info->idx].fd = info->call;	dev->fds[info->idx].events = POLLIN;	dev->nvqs++;} static void vdev_info_init(struct vdev_info* dev, unsigned long long features){	int r;	memset(dev, 0, sizeof *dev);	dev->vdev.features[0] = features;	dev->vdev.features[1] = features >> 32;	dev->buf_size = 1024;	dev->buf = malloc(dev->buf_size);	assert(dev->buf);        dev->control = open("/dev/vhost-test", O_RDWR);	assert(dev->control >= 0);	r = ioctl(dev->control, VHOST_SET_OWNER, NULL);	assert(r >= 0);	dev->mem = malloc(offsetof(struct vhost_memory, regions) +			  sizeof dev->mem->regions[0]);	assert(dev->mem);	memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +                          sizeof dev->mem->regions[0]);	dev->mem->nregions = 1;	dev->mem->regions[0].guest_phys_addr = (long)dev->buf;	dev->mem->regions[0].userspace_addr = (long)dev->buf;	dev->mem->regions[0].memory_size = dev->buf_size;	r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);	assert(r >= 0);} /* TODO: this is pretty bad: we get a cache line bounce * for the wait queue on poll and another one on read, * plus the read which is there just to clear the * current state. */static void wait_for_interrupt(struct vdev_info *dev){	int i;	unsigned long long val;	poll(dev->fds, dev->nvqs, -1);	for (i = 0; i < dev->nvqs; ++i)		if (dev->fds[i].revents & POLLIN) {			read(dev->fds[i].fd, &val, sizeof val);		}} static void run_test(struct vdev_info *dev, struct vq_info *vq,		     bool delayed, int bufs){	struct scatterlist sl;	long started = 0, completed = 0;	long completed_before;	int r, test = 1;	unsigned len;	long long spurious = 0;	r = ioctl(dev->control, VHOST_TEST_RUN, &test);	assert(r >= 0);	for (;;) {		virtqueue_disable_cb(vq->vq);		completed_before = completed;		do {			if (started < bufs) {				sg_init_one(&sl, dev->buf, dev->buf_size);				r = virtqueue_add_buf(vq->vq, &sl, 1, 0,						      dev->buf + started,						      GFP_ATOMIC);				if (likely(r >= 0)) {					++started;					virtqueue_kick(vq->vq);				}			} else				r = -1; 			/* Flush out completed bufs if any */			if (virtqueue_get_buf(vq->vq, &len)) {				++completed;				r = 0;			} 		} while (r >= 0);		if (completed == completed_before)			++spurious;		assert(completed <= bufs);		assert(started <= bufs);		if (completed == bufs)			break;		if (delayed) {			if (virtqueue_enable_cb_delayed(vq->vq))				wait_for_interrupt(dev);		} else {			if (virtqueue_enable_cb(vq->vq))				wait_for_interrupt(dev);		}	}	test = 0;	r = ioctl(dev->control, VHOST_TEST_RUN, &test);	assert(r >= 0);	fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);} const char optstring[] = "h";const struct option longopts[] = {	{		.name = "help",		.val = 'h',	},	{		.name = "event-idx",		.val = 'E',	},	{		.name = "no-event-idx",		.val = 'e',	},	{		.name = "indirect",		.val = 'I',	},	{		.name = "no-indirect",		.val = 'i',	},	{		.name = "delayed-interrupt",		.val = 'D',	},	{		.name = "no-delayed-interrupt",		.val = 'd',	},	{	}}; static void help(){	fprintf(stderr, "Usage: virtio_test [--help]"		" [--no-indirect]"		" [--no-event-idx]"		" [--delayed-interrupt]"		"\n");} int main(int argc, char **argv){	struct vdev_info dev;	unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |		(1ULL << VIRTIO_RING_F_EVENT_IDX);	int o;	bool delayed = false; 	for (;;) {		o = getopt_long(argc, argv, optstring, longopts, NULL);		switch (o) {		case -1:			goto done;		case '?':			help();			exit(2);		case 'e':			features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);			break;		case 'h':			help();			goto done;		case 'i':			features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);			break;		case 'D':			delayed = true;			break;		default:			assert(0);			break;		}	} done:	vdev_info_init(&dev, features);	vq_info_add(&dev, 256);	run_test(&dev, &dev.vqs[0], delayed, 0x100000);	return 0;}