cregit-Linux how code gets into the kernel

Release 4.7 tools/virtio/vringh_test.c

Directory: tools/virtio
/* Simple test of virtio code, entirely in userpsace. */

#define _GNU_SOURCE
#include <sched.h>
#include <err.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/virtio.h>
#include <linux/vringh.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_config.h>
#include <linux/uaccess.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <fcntl.h>


#define USER_MEM (1024*1024)


void *__user_addr_min, *__user_addr_max;



void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;

static u64 user_addr_offset;


#define RINGSIZE 256

#define ALIGN 4096


static bool never_notify_host(struct virtqueue *vq) { abort(); }

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static void never_callback_guest(struct virtqueue *vq) { abort(); }

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static bool getrange_iov(struct vringh *vrh, u64 addr, struct vringh_range *r) { if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset) return false; if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset) return false; r->start = (u64)(unsigned long)__user_addr_min - user_addr_offset; r->end_incl = (u64)(unsigned long)__user_addr_max - 1 - user_addr_offset; r->offset = user_addr_offset; return true; }

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/* We return single byte ranges. */
static bool getrange_slow(struct vringh *vrh, u64 addr, struct vringh_range *r) { if (addr < (u64)(unsigned long)__user_addr_min - user_addr_offset) return false; if (addr >= (u64)(unsigned long)__user_addr_max - user_addr_offset) return false; r->start = addr; r->end_incl = r->start; r->offset = user_addr_offset; return true; }

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struct guest_virtio_device { struct virtio_device vdev; int to_host_fd; unsigned long notifies; };
static bool parallel_notify_host(struct virtqueue *vq) { int rc; struct guest_virtio_device *gvdev; gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev); rc = write(gvdev->to_host_fd, "", 1); if (rc < 0) return false; gvdev->notifies++; return true; }

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static bool no_notify_host(struct virtqueue *vq) { return true; }

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#define NUM_XFERS (10000000) /* We aim for two "distant" cpus. */
static void find_cpus(unsigned int *first, unsigned int *last) { unsigned int i; *first = -1U; *last = 0; for (i = 0; i < 4096; i++) { cpu_set_t set; CPU_ZERO(&set); CPU_SET(i, &set); if (sched_setaffinity(getpid(), sizeof(set), &set) == 0) { if (i < *first) *first = i; if (i > *last) *last = i; } } }

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/* Opencoded version for fast mode */
static inline int vringh_get_head(struct vringh *vrh, u16 *head) { u16 avail_idx, i; int err; err = get_user(avail_idx, &vrh->vring.avail->idx); if (err) return err; if (vrh->last_avail_idx == avail_idx) return 0; /* Only get avail ring entries after they have been exposed by guest. */ virtio_rmb(vrh->weak_barriers); i = vrh->last_avail_idx & (vrh->vring.num - 1); err = get_user(*head, &vrh->vring.avail->ring[i]); if (err) return err; vrh->last_avail_idx++; return 1; }

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static int parallel_test(u64 features, bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r), bool fast_vringh) { void *host_map, *guest_map; int fd, mapsize, to_guest[2], to_host[2]; unsigned long xfers = 0, notifies = 0, receives = 0; unsigned int first_cpu, last_cpu; cpu_set_t cpu_set; char buf[128]; /* Create real file to mmap. */ fd = open("/tmp/vringh_test-file", O_RDWR|O_CREAT|O_TRUNC, 0600); if (fd < 0) err(1, "Opening /tmp/vringh_test-file"); /* Extra room at the end for some data, and indirects */ mapsize = vring_size(RINGSIZE, ALIGN) + RINGSIZE * 2 * sizeof(int) + RINGSIZE * 6 * sizeof(struct vring_desc); mapsize = (mapsize + getpagesize() - 1) & ~(getpagesize() - 1); ftruncate(fd, mapsize); /* Parent and child use separate addresses, to check our mapping logic! */ host_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); guest_map = mmap(NULL, mapsize, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); pipe(to_guest); pipe(to_host); CPU_ZERO(&cpu_set); find_cpus(&first_cpu, &last_cpu); printf("Using CPUS %u and %u\n", first_cpu, last_cpu); fflush(stdout); if (fork() != 0) { struct vringh vrh; int status, err, rlen = 0; char rbuf[5]; /* We are the host: never access guest addresses! */ munmap(guest_map, mapsize); __user_addr_min = host_map; __user_addr_max = __user_addr_min + mapsize; user_addr_offset = host_map - guest_map; assert(user_addr_offset); close(to_guest[0]); close(to_host[1]); vring_init(&vrh.vring, RINGSIZE, host_map, ALIGN); vringh_init_user(&vrh, features, RINGSIZE, true, vrh.vring.desc, vrh.vring.avail, vrh.vring.used); CPU_SET(first_cpu, &cpu_set); if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set)) errx(1, "Could not set affinity to cpu %u", first_cpu); while (xfers < NUM_XFERS) { struct iovec host_riov[2], host_wiov[2]; struct vringh_iov riov, wiov; u16 head, written; if (fast_vringh) { for (;;) { err = vringh_get_head(&vrh, &head); if (err != 0) break; err = vringh_need_notify_user(&vrh); if (err < 0) errx(1, "vringh_need_notify_user: %i", err); if (err) { write(to_guest[1], "", 1); notifies++; } } if (err != 1) errx(1, "vringh_get_head"); written = 0; goto complete; } else { vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov)); vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov)); err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); } if (err == 0) { err = vringh_need_notify_user(&vrh); if (err < 0) errx(1, "vringh_need_notify_user: %i", err); if (err) { write(to_guest[1], "", 1); notifies++; } if (!vringh_notify_enable_user(&vrh)) continue; /* Swallow all notifies at once. */ if (read(to_host[0], buf, sizeof(buf)) < 1) break; vringh_notify_disable_user(&vrh); receives++; continue; } if (err != 1) errx(1, "vringh_getdesc_user: %i", err); /* We simply copy bytes. */ if (riov.used) { rlen = vringh_iov_pull_user(&riov, rbuf, sizeof(rbuf)); if (rlen != 4) errx(1, "vringh_iov_pull_user: %i", rlen); assert(riov.i == riov.used); written = 0; } else { err = vringh_iov_push_user(&wiov, rbuf, rlen); if (err != rlen) errx(1, "vringh_iov_push_user: %i", err); assert(wiov.i == wiov.used); written = err; } complete: xfers++; err = vringh_complete_user(&vrh, head, written); if (err != 0) errx(1, "vringh_complete_user: %i", err); } err = vringh_need_notify_user(&vrh); if (err < 0) errx(1, "vringh_need_notify_user: %i", err); if (err) { write(to_guest[1], "", 1); notifies++; } wait(&status); if (!WIFEXITED(status)) errx(1, "Child died with signal %i?", WTERMSIG(status)); if (WEXITSTATUS(status) != 0) errx(1, "Child exited %i?", WEXITSTATUS(status)); printf("Host: notified %lu, pinged %lu\n", notifies, receives); return 0; } else { struct guest_virtio_device gvdev; struct virtqueue *vq; unsigned int *data; struct vring_desc *indirects; unsigned int finished = 0; /* We pass sg[]s pointing into here, but we need RINGSIZE+1 */ data = guest_map + vring_size(RINGSIZE, ALIGN); indirects = (void *)data + (RINGSIZE + 1) * 2 * sizeof(int); /* We are the guest. */ munmap(host_map, mapsize); close(to_guest[1]); close(to_host[0]); gvdev.vdev.features = features; gvdev.to_host_fd = to_host[1]; gvdev.notifies = 0; CPU_SET(first_cpu, &cpu_set); if (sched_setaffinity(getpid(), sizeof(cpu_set), &cpu_set)) err(1, "Could not set affinity to cpu %u", first_cpu); vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &gvdev.vdev, true, guest_map, fast_vringh ? no_notify_host : parallel_notify_host, never_callback_guest, "guest vq"); /* Don't kfree indirects. */ __kfree_ignore_start = indirects; __kfree_ignore_end = indirects + RINGSIZE * 6; while (xfers < NUM_XFERS) { struct scatterlist sg[4]; unsigned int num_sg, len; int *dbuf, err; bool output = !(xfers % 2); /* Consume bufs. */ while ((dbuf = virtqueue_get_buf(vq, &len)) != NULL) { if (len == 4) assert(*dbuf == finished - 1); else if (!fast_vringh) assert(*dbuf == finished); finished++; } /* Produce a buffer. */ dbuf = data + (xfers % (RINGSIZE + 1)); if (output) *dbuf = xfers; else *dbuf = -1; switch ((xfers / sizeof(*dbuf)) % 4) { case 0: /* Nasty three-element sg list. */ sg_init_table(sg, num_sg = 3); sg_set_buf(&sg[0], (void *)dbuf, 1); sg_set_buf(&sg[1], (void *)dbuf + 1, 2); sg_set_buf(&sg[2], (void *)dbuf + 3, 1); break; case 1: sg_init_table(sg, num_sg = 2); sg_set_buf(&sg[0], (void *)dbuf, 1); sg_set_buf(&sg[1], (void *)dbuf + 1, 3); break; case 2: sg_init_table(sg, num_sg = 1); sg_set_buf(&sg[0], (void *)dbuf, 4); break; case 3: sg_init_table(sg, num_sg = 4); sg_set_buf(&sg[0], (void *)dbuf, 1); sg_set_buf(&sg[1], (void *)dbuf + 1, 1); sg_set_buf(&sg[2], (void *)dbuf + 2, 1); sg_set_buf(&sg[3], (void *)dbuf + 3, 1); break; } /* May allocate an indirect, so force it to allocate * user addr */ __kmalloc_fake = indirects + (xfers % RINGSIZE) * 4; if (output) err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf, GFP_KERNEL); else err = virtqueue_add_inbuf(vq, sg, num_sg, dbuf, GFP_KERNEL); if (err == -ENOSPC) { if (!virtqueue_enable_cb_delayed(vq)) continue; /* Swallow all notifies at once. */ if (read(to_guest[0], buf, sizeof(buf)) < 1) break; receives++; virtqueue_disable_cb(vq); continue; } if (err) errx(1, "virtqueue_add_in/outbuf: %i", err); xfers++; virtqueue_kick(vq); } /* Any extra? */ while (finished != xfers) { int *dbuf; unsigned int len; /* Consume bufs. */ dbuf = virtqueue_get_buf(vq, &len); if (dbuf) { if (len == 4) assert(*dbuf == finished - 1); else assert(len == 0); finished++; continue; } if (!virtqueue_enable_cb_delayed(vq)) continue; if (read(to_guest[0], buf, sizeof(buf)) < 1) break; receives++; virtqueue_disable_cb(vq); } printf("Guest: notified %lu, pinged %lu\n", gvdev.notifies, receives); vring_del_virtqueue(vq); return 0; } }

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int main(int argc, char *argv[]) { struct virtio_device vdev; struct virtqueue *vq; struct vringh vrh; struct scatterlist guest_sg[RINGSIZE], *sgs[2]; struct iovec host_riov[2], host_wiov[2]; struct vringh_iov riov, wiov; struct vring_used_elem used[RINGSIZE]; char buf[28]; u16 head; int err; unsigned i; void *ret; bool (*getrange)(struct vringh *vrh, u64 addr, struct vringh_range *r); bool fast_vringh = false, parallel = false; getrange = getrange_iov; vdev.features = 0; while (argv[1]) { if (strcmp(argv[1], "--indirect") == 0) __virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC); else if (strcmp(argv[1], "--eventidx") == 0) __virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX); else if (strcmp(argv[1], "--virtio-1") == 0) __virtio_set_bit(&vdev, VIRTIO_F_VERSION_1); else if (strcmp(argv[1], "--slow-range") == 0) getrange = getrange_slow; else if (strcmp(argv[1], "--fast-vringh") == 0) fast_vringh = true; else if (strcmp(argv[1], "--parallel") == 0) parallel = true; else errx(1, "Unknown arg %s", argv[1]); argv++; } if (parallel) return parallel_test(vdev.features, getrange, fast_vringh); if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0) abort(); __user_addr_max = __user_addr_min + USER_MEM; memset(__user_addr_min, 0, vring_size(RINGSIZE, ALIGN)); /* Set up guest side. */ vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true, __user_addr_min, never_notify_host, never_callback_guest, "guest vq"); /* Set up host side. */ vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN); vringh_init_user(&vrh, vdev.features, RINGSIZE, true, vrh.vring.desc, vrh.vring.avail, vrh.vring.used); /* No descriptor to get yet... */ err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); if (err != 0) errx(1, "vringh_getdesc_user: %i", err); /* Guest puts in a descriptor. */ memcpy(__user_addr_max - 1, "a", 1); sg_init_table(guest_sg, 1); sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1); sg_init_table(guest_sg+1, 1); sg_set_buf(&guest_sg[1], __user_addr_max - 3, 2); sgs[0] = &guest_sg[0]; sgs[1] = &guest_sg[1]; /* May allocate an indirect, so force it to allocate user addr */ __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN); err = virtqueue_add_sgs(vq, sgs, 1, 1, &err, GFP_KERNEL); if (err) errx(1, "virtqueue_add_sgs: %i", err); __kmalloc_fake = NULL; /* Host retreives it. */ vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov)); vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov)); err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); if (err != 1) errx(1, "vringh_getdesc_user: %i", err); assert(riov.used == 1); assert(riov.iov[0].iov_base == __user_addr_max - 1); assert(riov.iov[0].iov_len == 1); if (getrange != getrange_slow) { assert(wiov.used == 1); assert(wiov.iov[0].iov_base == __user_addr_max - 3); assert(wiov.iov[0].iov_len == 2); } else { assert(wiov.used == 2); assert(wiov.iov[0].iov_base == __user_addr_max - 3); assert(wiov.iov[0].iov_len == 1); assert(wiov.iov[1].iov_base == __user_addr_max - 2); assert(wiov.iov[1].iov_len == 1); } err = vringh_iov_pull_user(&riov, buf, 5); if (err != 1) errx(1, "vringh_iov_pull_user: %i", err); assert(buf[0] == 'a'); assert(riov.i == 1); assert(vringh_iov_pull_user(&riov, buf, 5) == 0); memcpy(buf, "bcdef", 5); err = vringh_iov_push_user(&wiov, buf, 5); if (err != 2) errx(1, "vringh_iov_push_user: %i", err); assert(memcmp(__user_addr_max - 3, "bc", 2) == 0); assert(wiov.i == wiov.used); assert(vringh_iov_push_user(&wiov, buf, 5) == 0); /* Host is done. */ err = vringh_complete_user(&vrh, head, err); if (err != 0) errx(1, "vringh_complete_user: %i", err); /* Guest should see used token now. */ __kfree_ignore_start = __user_addr_min + vring_size(RINGSIZE, ALIGN); __kfree_ignore_end = __kfree_ignore_start + 1; ret = virtqueue_get_buf(vq, &i); if (ret != &err) errx(1, "virtqueue_get_buf: %p", ret); assert(i == 2); /* Guest puts in a huge descriptor. */ sg_init_table(guest_sg, RINGSIZE); for (i = 0; i < RINGSIZE; i++) { sg_set_buf(&guest_sg[i], __user_addr_max - USER_MEM/4, USER_MEM/4); } /* Fill contents with recognisable garbage. */ for (i = 0; i < USER_MEM/4; i++) ((char *)__user_addr_max - USER_MEM/4)[i] = i; /* This will allocate an indirect, so force it to allocate user addr */ __kmalloc_fake = __user_addr_min + vring_size(RINGSIZE, ALIGN); err = virtqueue_add_outbuf(vq, guest_sg, RINGSIZE, &err, GFP_KERNEL); if (err) errx(1, "virtqueue_add_outbuf (large): %i", err); __kmalloc_fake = NULL; /* Host picks it up (allocates new iov). */ vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov)); vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov)); err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); if (err != 1) errx(1, "vringh_getdesc_user: %i", err); assert(riov.max_num & VRINGH_IOV_ALLOCATED); assert(riov.iov != host_riov); if (getrange != getrange_slow) assert(riov.used == RINGSIZE); else assert(riov.used == RINGSIZE * USER_MEM/4); assert(!(wiov.max_num & VRINGH_IOV_ALLOCATED)); assert(wiov.used == 0); /* Pull data back out (in odd chunks), should be as expected. */ for (i = 0; i < RINGSIZE * USER_MEM/4; i += 3) { err = vringh_iov_pull_user(&riov, buf, 3); if (err != 3 && i + err != RINGSIZE * USER_MEM/4) errx(1, "vringh_iov_pull_user large: %i", err); assert(buf[0] == (char)i); assert(err < 2 || buf[1] == (char)(i + 1)); assert(err < 3 || buf[2] == (char)(i + 2)); } assert(riov.i == riov.used); vringh_iov_cleanup(&riov); vringh_iov_cleanup(&wiov); /* Complete using multi interface, just because we can. */ used[0].id = head; used[0].len = 0; err = vringh_complete_multi_user(&vrh, used, 1); if (err) errx(1, "vringh_complete_multi_user(1): %i", err); /* Free up those descriptors. */ ret = virtqueue_get_buf(vq, &i); if (ret != &err) errx(1, "virtqueue_get_buf: %p", ret); /* Add lots of descriptors. */ sg_init_table(guest_sg, 1); sg_set_buf(&guest_sg[0], __user_addr_max - 1, 1); for (i = 0; i < RINGSIZE; i++) { err = virtqueue_add_outbuf(vq, guest_sg, 1, &err, GFP_KERNEL); if (err) errx(1, "virtqueue_add_outbuf (multiple): %i", err); } /* Now get many, and consume them all at once. */ vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov)); vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov)); for (i = 0; i < RINGSIZE; i++) { err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); if (err != 1) errx(1, "vringh_getdesc_user: %i", err); used[i].id = head; used[i].len = 0; } /* Make sure it wraps around ring, to test! */ assert(vrh.vring.used->idx % RINGSIZE != 0); err = vringh_complete_multi_user(&vrh, used, RINGSIZE); if (err) errx(1, "vringh_complete_multi_user: %i", err); /* Free those buffers. */ for (i = 0; i < RINGSIZE; i++) { unsigned len; assert(virtqueue_get_buf(vq, &len) != NULL); } /* Test weird (but legal!) indirect. */ if (__virtio_test_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC)) { char *data = __user_addr_max - USER_MEM/4; struct vring_desc *d = __user_addr_max - USER_MEM/2; struct vring vring; /* Force creation of direct, which we modify. */ __virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC); vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true, __user_addr_min, never_notify_host, never_callback_guest, "guest vq"); sg_init_table(guest_sg, 4); sg_set_buf(&guest_sg[0], d, sizeof(*d)*2); sg_set_buf(&guest_sg[1], d + 2, sizeof(*d)*1); sg_set_buf(&guest_sg[2], data + 6, 4); sg_set_buf(&guest_sg[3], d + 3, sizeof(*d)*3); err = virtqueue_add_outbuf(vq, guest_sg, 4, &err, GFP_KERNEL); if (err) errx(1, "virtqueue_add_outbuf (indirect): %i", err); vring_init(&vring, RINGSIZE, __user_addr_min, ALIGN); /* They're used in order, but double-check... */ assert(vring.desc[0].addr == (unsigned long)d); assert(vring.desc[1].addr == (unsigned long)(d+2)); assert(vring.desc[2].addr == (unsigned long)data + 6); assert(vring.desc[3].addr == (unsigned long)(d+3)); vring.desc[0].flags |= VRING_DESC_F_INDIRECT; vring.desc[1].flags |= VRING_DESC_F_INDIRECT; vring.desc[3].flags |= VRING_DESC_F_INDIRECT; /* First indirect */ d[0].addr = (unsigned long)data; d[0].len = 1; d[0].flags = VRING_DESC_F_NEXT; d[0].next = 1; d[1].addr = (unsigned long)data + 1; d[1].len = 2; d[1].flags = 0; /* Second indirect */ d[2].addr = (unsigned long)data + 3; d[2].len = 3; d[2].flags = 0; /* Third indirect */ d[3].addr = (unsigned long)data + 10; d[3].len = 5; d[3].flags = VRING_DESC_F_NEXT; d[3].next = 1; d[4].addr = (unsigned long)data + 15; d[4].len = 6; d[4].flags = VRING_DESC_F_NEXT; d[4].next = 2; d[5].addr = (unsigned long)data + 21; d[5].len = 7; d[5].flags = 0; /* Host picks it up (allocates new iov). */ vringh_iov_init(&riov, host_riov, ARRAY_SIZE(host_riov)); vringh_iov_init(&wiov, host_wiov, ARRAY_SIZE(host_wiov)); err = vringh_getdesc_user(&vrh, &riov, &wiov, getrange, &head); if (err != 1) errx(1, "vringh_getdesc_user: %i", err); if (head != 0) errx(1, "vringh_getdesc_user: head %i not 0", head); assert(riov.max_num & VRINGH_IOV_ALLOCATED); if (getrange != getrange_slow) assert(riov.used == 7); else assert(riov.used == 28); err = vringh_iov_pull_user(&riov, buf, 29); assert(err == 28); /* Data should be linear. */ for (i = 0; i < err; i++) assert(buf[i] == i); vringh_iov_cleanup(&riov); } /* Don't leak memory... */ vring_del_virtqueue(vq); free(__user_addr_min); return 0; }

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Total4702100.00%8100.00%
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