[Qemu-devel] [PULL v2 42/50] tests: add ivshmem qtest

[marcandre . lureau]

From: Marc-André Lureau <address@hidden>

Adds 4 ivshmemtests:
- single qemu instance and basic IO
- pair of instances, check memory sharing
- pair of instances with server, and MSIX
- hot plug/unplug

A temporary shm is created as well as a directory to place server
socket, both should be clear on exit and abort.

Cc: Cam Macdonell <address@hidden>
Signed-off-by: Marc-André Lureau <address@hidden>
Reviewed-by: Claudio Fontana <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
---
 tests/Makefile       |   2 +-
 tests/ivshmem-test.c | 465 ++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 447 insertions(+), 20 deletions(-)

diff --git a/tests/Makefile b/tests/Makefile
index c44b8de..e92906b 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -442,7 +442,7 @@ tests/qemu-iotests/socket_scm_helper$(EXESUF): 
tests/qemu-iotests/socket_scm_hel
 tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o $(test-util-obj-y)
 tests/test-write-threshold$(EXESUF): tests/test-write-threshold.o 
$(test-block-obj-y)
 tests/test-netfilter$(EXESUF): tests/test-netfilter.o $(qtest-obj-y)
-tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o
+tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o 
contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
 
 ifeq ($(CONFIG_POSIX),y)
 LIBS += -lutil
diff --git a/tests/ivshmem-test.c b/tests/ivshmem-test.c
index 2f6bec8..0f98aaf 100644
--- a/tests/ivshmem-test.c
+++ b/tests/ivshmem-test.c
@@ -2,50 +2,477 @@
  * QTest testcase for ivshmem
  *
  * Copyright (c) 2014 SUSE LINUX Products GmbH
+ * Copyright (c) 2015 Red Hat, Inc.
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  */
 
+#include <errno.h>
+#include <fcntl.h>
 #include <glib.h>
-#include <stdlib.h>
+#include <glib/gstdio.h>
 #include <string.h>
+#include <sys/mman.h>
 #include <unistd.h>
+#include "contrib/ivshmem-server/ivshmem-server.h"
+#include "libqos/pci-pc.h"
 #include "libqtest.h"
 #include "qemu/osdep.h"
+#include "qemu-common.h"
 
-static char dev_shm_path[] = "/dev/shm/qtest.XXXXXX";
+#define TMPSHMSIZE (1 << 20)
+static char *tmpshm;
+static void *tmpshmem;
+static char *tmpdir;
+static char *tmpserver;
 
-/* Tests only initialization so far. TODO: Replace with functional tests */
-static void nop(void)
+static void save_fn(QPCIDevice *dev, int devfn, void *data)
 {
+    QPCIDevice **pdev = (QPCIDevice **) data;
+
+    *pdev = dev;
+}
+
+static QPCIDevice *get_device(void)
+{
+    QPCIDevice *dev;
+    QPCIBus *pcibus;
+
+    pcibus = qpci_init_pc();
+    qpci_device_foreach(pcibus, 0x1af4, 0x1110, save_fn, &dev);
+    g_assert(dev != NULL);
+
+    return dev;
+}
+
+typedef struct _IVState {
+    QTestState *qtest;
+    void *reg_base, *mem_base;
+    QPCIDevice *dev;
+} IVState;
+
+enum Reg {
+    INTRMASK = 0,
+    INTRSTATUS = 4,
+    IVPOSITION = 8,
+    DOORBELL = 12,
+};
+
+static const char* reg2str(enum Reg reg) {
+    switch (reg) {
+    case INTRMASK:
+        return "IntrMask";
+    case INTRSTATUS:
+        return "IntrStatus";
+    case IVPOSITION:
+        return "IVPosition";
+    case DOORBELL:
+        return "DoorBell";
+    default:
+        return NULL;
+    }
+}
+
+static inline unsigned in_reg(IVState *s, enum Reg reg)
+{
+    const char *name = reg2str(reg);
+    QTestState *qtest = global_qtest;
+    unsigned res;
+
+    global_qtest = s->qtest;
+    res = qpci_io_readl(s->dev, s->reg_base + reg);
+    g_test_message("*%s -> %x\n", name, res);
+    global_qtest = qtest;
+
+    return res;
+}
+
+static inline void out_reg(IVState *s, enum Reg reg, unsigned v)
+{
+    const char *name = reg2str(reg);
+    QTestState *qtest = global_qtest;
+
+    global_qtest = s->qtest;
+    g_test_message("%x -> *%s\n", v, name);
+    qpci_io_writel(s->dev, s->reg_base + reg, v);
+    global_qtest = qtest;
+}
+
+static void setup_vm_cmd(IVState *s, const char *cmd, bool msix)
+{
+    uint64_t barsize;
+
+    s->qtest = qtest_start(cmd);
+
+    s->dev = get_device();
+
+    /* FIXME: other bar order fails, mappings changes */
+    s->mem_base = qpci_iomap(s->dev, 2, &barsize);
+    g_assert_nonnull(s->mem_base);
+    g_assert_cmpuint(barsize, ==, TMPSHMSIZE);
+
+    if (msix) {
+        qpci_msix_enable(s->dev);
+    }
+
+    s->reg_base = qpci_iomap(s->dev, 0, &barsize);
+    g_assert_nonnull(s->reg_base);
+    g_assert_cmpuint(barsize, ==, 256);
+
+    qpci_device_enable(s->dev);
+}
+
+static void setup_vm(IVState *s)
+{
+    char *cmd = g_strdup_printf("-device ivshmem,shm=%s,size=1M", tmpshm);
+
+    setup_vm_cmd(s, cmd, false);
+
+    g_free(cmd);
+}
+
+static void test_ivshmem_single(void)
+{
+    IVState state, *s;
+    uint32_t data[1024];
+    int i;
+
+    setup_vm(&state);
+    s = &state;
+
+    /* valid io */
+    out_reg(s, INTRMASK, 0);
+    in_reg(s, INTRSTATUS);
+    in_reg(s, IVPOSITION);
+
+    out_reg(s, INTRMASK, 0xffffffff);
+    g_assert_cmpuint(in_reg(s, INTRMASK), ==, 0xffffffff);
+    out_reg(s, INTRSTATUS, 1);
+    /* XXX: intercept IRQ, not seen in resp */
+    g_assert_cmpuint(in_reg(s, INTRSTATUS), ==, 1);
+
+    /* invalid io */
+    out_reg(s, IVPOSITION, 1);
+    out_reg(s, DOORBELL, 8 << 16);
+
+    for (i = 0; i < G_N_ELEMENTS(data); i++) {
+        data[i] = i;
+    }
+    qtest_memwrite(s->qtest, (uintptr_t)s->mem_base, data, sizeof(data));
+
+    for (i = 0; i < G_N_ELEMENTS(data); i++) {
+        g_assert_cmpuint(((uint32_t *)tmpshmem)[i], ==, i);
+    }
+
+    memset(data, 0, sizeof(data));
+
+    qtest_memread(s->qtest, (uintptr_t)s->mem_base, data, sizeof(data));
+    for (i = 0; i < G_N_ELEMENTS(data); i++) {
+        g_assert_cmpuint(data[i], ==, i);
+    }
+
+    qtest_quit(s->qtest);
+}
+
+static void test_ivshmem_pair(void)
+{
+    IVState state1, state2, *s1, *s2;
+    char *data;
+    int i;
+
+    setup_vm(&state1);
+    s1 = &state1;
+    setup_vm(&state2);
+    s2 = &state2;
+
+    data = g_malloc0(TMPSHMSIZE);
+
+    /* host write, guest 1 & 2 read */
+    memset(tmpshmem, 0x42, TMPSHMSIZE);
+    qtest_memread(s1->qtest, (uintptr_t)s1->mem_base, data, TMPSHMSIZE);
+    for (i = 0; i < TMPSHMSIZE; i++) {
+        g_assert_cmpuint(data[i], ==, 0x42);
+    }
+    qtest_memread(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
+    for (i = 0; i < TMPSHMSIZE; i++) {
+        g_assert_cmpuint(data[i], ==, 0x42);
+    }
+
+    /* guest 1 write, guest 2 read */
+    memset(data, 0x43, TMPSHMSIZE);
+    qtest_memwrite(s1->qtest, (uintptr_t)s1->mem_base, data, TMPSHMSIZE);
+    memset(data, 0, TMPSHMSIZE);
+    qtest_memread(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
+    for (i = 0; i < TMPSHMSIZE; i++) {
+        g_assert_cmpuint(data[i], ==, 0x43);
+    }
+
+    /* guest 2 write, guest 1 read */
+    memset(data, 0x44, TMPSHMSIZE);
+    qtest_memwrite(s2->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
+    memset(data, 0, TMPSHMSIZE);
+    qtest_memread(s1->qtest, (uintptr_t)s2->mem_base, data, TMPSHMSIZE);
+    for (i = 0; i < TMPSHMSIZE; i++) {
+        g_assert_cmpuint(data[i], ==, 0x44);
+    }
+
+    qtest_quit(s1->qtest);
+    qtest_quit(s2->qtest);
+    g_free(data);
+}
+
+typedef struct ServerThread {
+    GThread *thread;
+    IvshmemServer *server;
+    int pipe[2]; /* to handle quit */
+} ServerThread;
+
+static void *server_thread(void *data)
+{
+    ServerThread *t = data;
+    IvshmemServer *server = t->server;
+
+    while (true) {
+        fd_set fds;
+        int maxfd, ret;
+
+        FD_ZERO(&fds);
+        FD_SET(t->pipe[0], &fds);
+        maxfd = t->pipe[0] + 1;
+
+        ivshmem_server_get_fds(server, &fds, &maxfd);
+
+        ret = select(maxfd, &fds, NULL, NULL, NULL);
+
+        if (ret < 0) {
+            if (errno == EINTR) {
+                continue;
+            }
+
+            g_critical("select error: %s\n", strerror(errno));
+            break;
+        }
+        if (ret == 0) {
+            continue;
+        }
+
+        if (FD_ISSET(t->pipe[0], &fds)) {
+            break;
+        }
+
+        if (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) {
+            g_critical("ivshmem_server_handle_fds() failed\n");
+            break;
+        }
+    }
+
+    return NULL;
+}
+
+static void setup_vm_with_server(IVState *s, int nvectors)
+{
+    char *cmd = g_strdup_printf("-chardev socket,id=chr0,path=%s,nowait "
+                                "-device 
ivshmem,size=1M,chardev=chr0,vectors=%d",
+                                tmpserver, nvectors);
+
+    setup_vm_cmd(s, cmd, true);
+
+    g_free(cmd);
+}
+
+static GThread *thread_new(const gchar *name, GThreadFunc func, gpointer data)
+{
+    GThread *thread = NULL;
+    GError *error = NULL;
+    thread = g_thread_create(func, data, TRUE, &error);
+    g_assert_no_error(error);
+    return thread;
+}
+
+static void test_ivshmem_server(void)
+{
+    IVState state1, state2, *s1, *s2;
+    ServerThread thread;
+    IvshmemServer server;
+    int ret, vm1, vm2;
+    int nvectors = 2;
+
+    memset(tmpshmem, 0x42, TMPSHMSIZE);
+    ret = ivshmem_server_init(&server, tmpserver, tmpshm,
+                              TMPSHMSIZE, nvectors,
+                              getenv("QTEST_LOG") != NULL);
+    g_assert_cmpint(ret, ==, 0);
+
+    ret = ivshmem_server_start(&server);
+    g_assert_cmpint(ret, ==, 0);
+
+    setup_vm_with_server(&state1, nvectors);
+    s1 = &state1;
+    setup_vm_with_server(&state2, nvectors);
+    s2 = &state2;
+
+    g_assert_cmpuint(in_reg(s1, IVPOSITION), ==, 0xffffffff);
+    g_assert_cmpuint(in_reg(s2, IVPOSITION), ==, 0xffffffff);
+
+    g_assert_cmpuint(qtest_readb(s1->qtest, (uintptr_t)s1->mem_base), ==, 
0x00);
+
+    thread.server = &server;
+    ret = pipe(thread.pipe);
+    g_assert_cmpint(ret, ==, 0);
+    thread.thread = thread_new("ivshmem-server", server_thread, &thread);
+
+    /* waiting until mapping is done */
+    while (true) {
+        g_usleep(1000);
+
+        if (qtest_readb(s1->qtest, (uintptr_t)s1->mem_base) == 0x42 &&
+            qtest_readb(s2->qtest, (uintptr_t)s2->mem_base) == 0x42) {
+            break;
+        }
+    }
+
+    /* check got different VM ids */
+    vm1 = in_reg(s1, IVPOSITION);
+    vm2 = in_reg(s2, IVPOSITION);
+    g_assert_cmpuint(vm1, !=, vm2);
+
+    global_qtest = s1->qtest;
+    ret = qpci_msix_table_size(s1->dev);
+    g_assert_cmpuint(ret, ==, nvectors);
+
+    /* ping vm2 -> vm1 */
+    ret = qpci_msix_pending(s1->dev, 0);
+    g_assert_cmpuint(ret, ==, 0);
+    out_reg(s2, DOORBELL, vm1 << 16);
+    g_usleep(10000);
+    ret = qpci_msix_pending(s1->dev, 0);
+    g_assert_cmpuint(ret, !=, 0);
+
+    /* ping vm1 -> vm2 */
+    global_qtest = s2->qtest;
+    ret = qpci_msix_pending(s2->dev, 0);
+    g_assert_cmpuint(ret, ==, 0);
+    out_reg(s1, DOORBELL, vm2 << 16);
+    g_usleep(10000);
+    ret = qpci_msix_pending(s2->dev, 0);
+    g_assert_cmpuint(ret, !=, 0);
+
+    /* remove vm2 */
+    qtest_quit(s2->qtest);
+    /* XXX wait enough time for vm1 to be notified */
+    g_usleep(1000);
+
+    qtest_quit(s1->qtest);
+
+    if (qemu_write_full(thread.pipe[1], "q", 1) != 1) {
+        g_error("qemu_write_full: %s", g_strerror(errno));
+    }
+
+    g_thread_join(thread.thread);
+
+    ivshmem_server_close(&server);
+    close(thread.pipe[1]);
+    close(thread.pipe[0]);
+}
+
+#define PCI_SLOT_HP             0x06
+
+static void test_ivshmem_hotplug(void)
+{
+    gchar *opts;
+
+    qtest_start("");
+
+    opts = g_strdup_printf("'shm': '%s', 'size': '1M'", tmpshm);
+
+    qpci_plug_device_test("ivshmem", "iv1", PCI_SLOT_HP, opts);
+    qpci_unplug_acpi_device_test("iv1", PCI_SLOT_HP);
+
+    qtest_end();
+    g_free(opts);
+}
+
+static void cleanup(void)
+{
+    if (tmpshmem) {
+        munmap(tmpshmem, TMPSHMSIZE);
+        tmpshmem = NULL;
+    }
+
+    if (tmpshm) {
+        shm_unlink(tmpshm);
+        g_free(tmpshm);
+        tmpshm = NULL;
+    }
+
+    if (tmpserver) {
+        g_unlink(tmpserver);
+        g_free(tmpserver);
+        tmpserver = NULL;
+    }
+
+    if (tmpdir) {
+        g_rmdir(tmpdir);
+        tmpdir = NULL;
+    }
+}
+
+static void abrt_handler(void *data)
+{
+    cleanup();
+}
+
+static gchar *mktempshm(int size, int *fd)
+{
+    while (true) {
+        gchar *name;
+
+        name = g_strdup_printf("/qtest-%u-%u", getpid(), g_random_int());
+        *fd = shm_open(name, O_CREAT|O_RDWR|O_EXCL,
+                       S_IRWXU|S_IRWXG|S_IRWXO);
+        if (*fd > 0) {
+            g_assert(ftruncate(*fd, size) == 0);
+            return name;
+        }
+
+        g_free(name);
+    }
 }
 
 int main(int argc, char **argv)
 {
-    QTestState *s1, *s2;
-    char *cmd;
     int ret, fd;
+    static gchar dir[] = "/tmp/ivshmem-test.XXXXXX";
+
+#if !GLIB_CHECK_VERSION(2, 31, 0)
+    if (!g_thread_supported()) {
+        g_thread_init(NULL);
+    }
+#endif
 
     g_test_init(&argc, &argv, NULL);
-    qtest_add_func("/ivshmem/nop", nop);
 
-    fd = mkstemp(dev_shm_path);
-    g_assert(fd >= 0);
-    close(fd);
-    unlink(dev_shm_path);
+    qtest_add_abrt_handler(abrt_handler, NULL);
+    /* shm */
+    tmpshm = mktempshm(TMPSHMSIZE, &fd);
+    tmpshmem = mmap(0, TMPSHMSIZE, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+    g_assert(tmpshmem != MAP_FAILED);
+    /* server */
+    if (mkdtemp(dir) == NULL) {
+        g_error("mkdtemp: %s", g_strerror(errno));
+    }
+    tmpdir = dir;
+    tmpserver = g_strconcat(tmpdir, "/server", NULL);
 
-    cmd = g_strdup_printf("-device ivshmem,shm=%s,size=1M", &dev_shm_path[9]);
-    s1 = qtest_start(cmd);
-    s2 = qtest_start(cmd);
-    g_free(cmd);
+    qtest_add_func("/ivshmem/single", test_ivshmem_single);
+    qtest_add_func("/ivshmem/pair", test_ivshmem_pair);
+    qtest_add_func("/ivshmem/server", test_ivshmem_server);
+    qtest_add_func("/ivshmem/hotplug", test_ivshmem_hotplug);
 
     ret = g_test_run();
 
-    qtest_quit(s1);
-    qtest_quit(s2);
-
-    unlink(dev_shm_path);
+    cleanup();
 
     return ret;
 }
-- 
2.4.3