Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 1074 insertions, 0 deletions

diff --git a/softmmu/qtest.c b/softmmu/qtest.c
new file mode 100644
index 000000000..72751e1fd
--- /dev/null
+++ b/softmmu/qtest.c
@@ -0,0 +1,1074 @@
+/*
+ * Test Server
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * 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 "qemu/osdep.h"
+#include "qapi/error.h"
+#include "cpu.h"
+#include "sysemu/qtest.h"
+#include "sysemu/runstate.h"
+#include "chardev/char-fe.h"
+#include "exec/ioport.h"
+#include "exec/memory.h"
+#include "hw/irq.h"
+#include "qemu/accel.h"
+#include "sysemu/cpu-timers.h"
+#include "qemu/config-file.h"
+#include "qemu/option.h"
+#include "qemu/error-report.h"
+#include "qemu/module.h"
+#include "qemu/cutils.h"
+#include "qapi/qmp/qerror.h"
+#include "qom/object_interfaces.h"
+#include CONFIG_DEVICES
+#ifdef CONFIG_PSERIES
+#include "hw/ppc/spapr_rtas.h"
+#endif
+
+#define MAX_IRQ 256
+
+#define TYPE_QTEST "qtest"
+
+OBJECT_DECLARE_SIMPLE_TYPE(QTest, QTEST)
+
+struct QTest {
+    Object parent;
+
+    bool has_machine_link;
+    char *chr_name;
+    Chardev *chr;
+    CharBackend qtest_chr;
+    char *log;
+};
+
+bool qtest_allowed;
+
+static DeviceState *irq_intercept_dev;
+static FILE *qtest_log_fp;
+static QTest *qtest;
+static GString *inbuf;
+static int irq_levels[MAX_IRQ];
+static qemu_timeval start_time;
+static bool qtest_opened;
+static void (*qtest_server_send)(void*, const char*);
+static void *qtest_server_send_opaque;
+
+#define FMT_timeval "%ld.%06ld"
+
+/**
+ * DOC: QTest Protocol
+ *
+ * Line based protocol, request/response based.  Server can send async messages
+ * so clients should always handle many async messages before the response
+ * comes in.
+ *
+ * Valid requests
+ * ^^^^^^^^^^^^^^
+ *
+ * Clock management:
+ * """""""""""""""""
+ *
+ * The qtest client is completely in charge of the QEMU_CLOCK_VIRTUAL.  qtest commands
+ * let you adjust the value of the clock (monotonically).  All the commands
+ * return the current value of the clock in nanoseconds.
+ *
+ * .. code-block:: none
+ *
+ *  > clock_step
+ *  < OK VALUE
+ *
+ * Advance the clock to the next deadline.  Useful when waiting for
+ * asynchronous events.
+ *
+ * .. code-block:: none
+ *
+ *  > clock_step NS
+ *  < OK VALUE
+ *
+ * Advance the clock by NS nanoseconds.
+ *
+ * .. code-block:: none
+ *
+ *  > clock_set NS
+ *  < OK VALUE
+ *
+ * Advance the clock to NS nanoseconds (do nothing if it's already past).
+ *
+ * PIO and memory access:
+ * """"""""""""""""""""""
+ *
+ * .. code-block:: none
+ *
+ *  > outb ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > outw ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > outl ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > inb ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > inw ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > inl ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > writeb ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > writew ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > writel ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > writeq ADDR VALUE
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > readb ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > readw ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > readl ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > readq ADDR
+ *  < OK VALUE
+ *
+ * .. code-block:: none
+ *
+ *  > read ADDR SIZE
+ *  < OK DATA
+ *
+ * .. code-block:: none
+ *
+ *  > write ADDR SIZE DATA
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > b64read ADDR SIZE
+ *  < OK B64_DATA
+ *
+ * .. code-block:: none
+ *
+ *  > b64write ADDR SIZE B64_DATA
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > memset ADDR SIZE VALUE
+ *  < OK
+ *
+ * ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
+ * For 'memset' a zero size is permitted and does nothing.
+ *
+ * DATA is an arbitrarily long hex number prefixed with '0x'.  If it's smaller
+ * than the expected size, the value will be zero filled at the end of the data
+ * sequence.
+ *
+ * B64_DATA is an arbitrarily long base64 encoded string.
+ * If the sizes do not match, the data will be truncated.
+ *
+ * IRQ management:
+ * """""""""""""""
+ *
+ * .. code-block:: none
+ *
+ *  > irq_intercept_in QOM-PATH
+ *  < OK
+ *
+ * .. code-block:: none
+ *
+ *  > irq_intercept_out QOM-PATH
+ *  < OK
+ *
+ * Attach to the gpio-in (resp. gpio-out) pins exported by the device at
+ * QOM-PATH.  When the pin is triggered, one of the following async messages
+ * will be printed to the qtest stream::
+ *
+ *  IRQ raise NUM
+ *  IRQ lower NUM
+ *
+ * where NUM is an IRQ number.  For the PC, interrupts can be intercepted
+ * simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
+ * NUM=0 even though it is remapped to GSI 2).
+ *
+ * Setting interrupt level:
+ * """"""""""""""""""""""""
+ *
+ * .. code-block:: none
+ *
+ *  > set_irq_in QOM-PATH NAME NUM LEVEL
+ *  < OK
+ *
+ * where NAME is the name of the irq/gpio list, NUM is an IRQ number and
+ * LEVEL is an signed integer IRQ level.
+ *
+ * Forcibly set the given interrupt pin to the given level.
+ *
+ */
+
+static int hex2nib(char ch)
+{
+    if (ch >= '0' && ch <= '9') {
+        return ch - '0';
+    } else if (ch >= 'a' && ch <= 'f') {
+        return 10 + (ch - 'a');
+    } else if (ch >= 'A' && ch <= 'F') {
+        return 10 + (ch - 'A');
+    } else {
+        return -1;
+    }
+}
+
+static void qtest_get_time(qemu_timeval *tv)
+{
+    qemu_gettimeofday(tv);
+    tv->tv_sec -= start_time.tv_sec;
+    tv->tv_usec -= start_time.tv_usec;
+    if (tv->tv_usec < 0) {
+        tv->tv_usec += 1000000;
+        tv->tv_sec -= 1;
+    }
+}
+
+static void qtest_send_prefix(CharBackend *chr)
+{
+    qemu_timeval tv;
+
+    if (!qtest_log_fp || !qtest_opened) {
+        return;
+    }
+
+    qtest_get_time(&tv);
+    fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
+            (long) tv.tv_sec, (long) tv.tv_usec);
+}
+
+static void GCC_FMT_ATTR(1, 2) qtest_log_send(const char *fmt, ...)
+{
+    va_list ap;
+
+    if (!qtest_log_fp || !qtest_opened) {
+        return;
+    }
+
+    qtest_send_prefix(NULL);
+
+    va_start(ap, fmt);
+    vfprintf(qtest_log_fp, fmt, ap);
+    va_end(ap);
+}
+
+static void qtest_server_char_be_send(void *opaque, const char *str)
+{
+    size_t len = strlen(str);
+    CharBackend* chr = (CharBackend *)opaque;
+    qemu_chr_fe_write_all(chr, (uint8_t *)str, len);
+    if (qtest_log_fp && qtest_opened) {
+        fprintf(qtest_log_fp, "%s", str);
+    }
+}
+
+static void qtest_send(CharBackend *chr, const char *str)
+{
+    qtest_server_send(qtest_server_send_opaque, str);
+}
+
+static void GCC_FMT_ATTR(2, 3) qtest_sendf(CharBackend *chr,
+                                           const char *fmt, ...)
+{
+    va_list ap;
+    gchar *buffer;
+
+    va_start(ap, fmt);
+    buffer = g_strdup_vprintf(fmt, ap);
+    qtest_send(chr, buffer);
+    g_free(buffer);
+    va_end(ap);
+}
+
+static void qtest_irq_handler(void *opaque, int n, int level)
+{
+    qemu_irq old_irq = *(qemu_irq *)opaque;
+    qemu_set_irq(old_irq, level);
+
+    if (irq_levels[n] != level) {
+        CharBackend *chr = &qtest->qtest_chr;
+        irq_levels[n] = level;
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "IRQ %s %d\n",
+                    level ? "raise" : "lower", n);
+    }
+}
+
+static int64_t qtest_clock_counter;
+
+int64_t qtest_get_virtual_clock(void)
+{
+    return qatomic_read_i64(&qtest_clock_counter);
+}
+
+static void qtest_set_virtual_clock(int64_t count)
+{
+    qatomic_set_i64(&qtest_clock_counter, count);
+}
+
+static void qtest_clock_warp(int64_t dest)
+{
+    int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    AioContext *aio_context;
+    assert(qtest_enabled());
+    aio_context = qemu_get_aio_context();
+    while (clock < dest) {
+        int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
+                                                      QEMU_TIMER_ATTR_ALL);
+        int64_t warp = qemu_soonest_timeout(dest - clock, deadline);
+
+        qtest_set_virtual_clock(qtest_get_virtual_clock() + warp);
+
+        qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
+        timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]);
+        clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    }
+    qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
+}
+
+static void qtest_process_command(CharBackend *chr, gchar **words)
+{
+    const gchar *command;
+
+    g_assert(words);
+
+    command = words[0];
+
+    if (qtest_log_fp) {
+        qemu_timeval tv;
+        int i;
+
+        qtest_get_time(&tv);
+        fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
+                (long) tv.tv_sec, (long) tv.tv_usec);
+        for (i = 0; words[i]; i++) {
+            fprintf(qtest_log_fp, " %s", words[i]);
+        }
+        fprintf(qtest_log_fp, "\n");
+    }
+
+    g_assert(command);
+    if (strcmp(words[0], "irq_intercept_out") == 0
+        || strcmp(words[0], "irq_intercept_in") == 0) {
+        DeviceState *dev;
+        NamedGPIOList *ngl;
+
+        g_assert(words[1]);
+        dev = DEVICE(object_resolve_path(words[1], NULL));
+        if (!dev) {
+            qtest_send_prefix(chr);
+            qtest_send(chr, "FAIL Unknown device\n");
+            return;
+        }
+
+        if (irq_intercept_dev) {
+            qtest_send_prefix(chr);
+            if (irq_intercept_dev != dev) {
+                qtest_send(chr, "FAIL IRQ intercept already enabled\n");
+            } else {
+                qtest_send(chr, "OK\n");
+            }
+            return;
+        }
+
+        QLIST_FOREACH(ngl, &dev->gpios, node) {
+            /* We don't support intercept of named GPIOs yet */
+            if (ngl->name) {
+                continue;
+            }
+            if (words[0][14] == 'o') {
+                int i;
+                for (i = 0; i < ngl->num_out; ++i) {
+                    qemu_irq *disconnected = g_new0(qemu_irq, 1);
+                    qemu_irq icpt = qemu_allocate_irq(qtest_irq_handler,
+                                                      disconnected, i);
+
+                    *disconnected = qdev_intercept_gpio_out(dev, icpt,
+                                                            ngl->name, i);
+                }
+            } else {
+                qemu_irq_intercept_in(ngl->in, qtest_irq_handler,
+                                      ngl->num_in);
+            }
+        }
+        irq_intercept_dev = dev;
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "set_irq_in") == 0) {
+        DeviceState *dev;
+        qemu_irq irq;
+        char *name;
+        int ret;
+        int num;
+        int level;
+
+        g_assert(words[1] && words[2] && words[3] && words[4]);
+
+        dev = DEVICE(object_resolve_path(words[1], NULL));
+        if (!dev) {
+            qtest_send_prefix(chr);
+            qtest_send(chr, "FAIL Unknown device\n");
+            return;
+        }
+
+        if (strcmp(words[2], "unnamed-gpio-in") == 0) {
+            name = NULL;
+        } else {
+            name = words[2];
+        }
+
+        ret = qemu_strtoi(words[3], NULL, 0, &num);
+        g_assert(!ret);
+        ret = qemu_strtoi(words[4], NULL, 0, &level);
+        g_assert(!ret);
+
+        irq = qdev_get_gpio_in_named(dev, name, num);
+
+        qemu_set_irq(irq, level);
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "outb") == 0 ||
+               strcmp(words[0], "outw") == 0 ||
+               strcmp(words[0], "outl") == 0) {
+        unsigned long addr;
+        unsigned long value;
+        int ret;
+
+        g_assert(words[1] && words[2]);
+        ret = qemu_strtoul(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtoul(words[2], NULL, 0, &value);
+        g_assert(ret == 0);
+        g_assert(addr <= 0xffff);
+
+        if (words[0][3] == 'b') {
+            cpu_outb(addr, value);
+        } else if (words[0][3] == 'w') {
+            cpu_outw(addr, value);
+        } else if (words[0][3] == 'l') {
+            cpu_outl(addr, value);
+        }
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "inb") == 0 ||
+        strcmp(words[0], "inw") == 0 ||
+        strcmp(words[0], "inl") == 0) {
+        unsigned long addr;
+        uint32_t value = -1U;
+        int ret;
+
+        g_assert(words[1]);
+        ret = qemu_strtoul(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        g_assert(addr <= 0xffff);
+
+        if (words[0][2] == 'b') {
+            value = cpu_inb(addr);
+        } else if (words[0][2] == 'w') {
+            value = cpu_inw(addr);
+        } else if (words[0][2] == 'l') {
+            value = cpu_inl(addr);
+        }
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK 0x%04x\n", value);
+    } else if (strcmp(words[0], "writeb") == 0 ||
+               strcmp(words[0], "writew") == 0 ||
+               strcmp(words[0], "writel") == 0 ||
+               strcmp(words[0], "writeq") == 0) {
+        uint64_t addr;
+        uint64_t value;
+        int ret;
+
+        g_assert(words[1] && words[2]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &value);
+        g_assert(ret == 0);
+
+        if (words[0][5] == 'b') {
+            uint8_t data = value;
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 1);
+        } else if (words[0][5] == 'w') {
+            uint16_t data = value;
+            tswap16s(&data);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 2);
+        } else if (words[0][5] == 'l') {
+            uint32_t data = value;
+            tswap32s(&data);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 4);
+        } else if (words[0][5] == 'q') {
+            uint64_t data = value;
+            tswap64s(&data);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                &data, 8);
+        }
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "readb") == 0 ||
+               strcmp(words[0], "readw") == 0 ||
+               strcmp(words[0], "readl") == 0 ||
+               strcmp(words[0], "readq") == 0) {
+        uint64_t addr;
+        uint64_t value = UINT64_C(-1);
+        int ret;
+
+        g_assert(words[1]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+
+        if (words[0][4] == 'b') {
+            uint8_t data;
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 1);
+            value = data;
+        } else if (words[0][4] == 'w') {
+            uint16_t data;
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 2);
+            value = tswap16(data);
+        } else if (words[0][4] == 'l') {
+            uint32_t data;
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &data, 4);
+            value = tswap32(data);
+        } else if (words[0][4] == 'q') {
+            address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                               &value, 8);
+            tswap64s(&value);
+        }
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK 0x%016" PRIx64 "\n", value);
+    } else if (strcmp(words[0], "read") == 0) {
+        uint64_t addr, len, i;
+        uint8_t *data;
+        char *enc;
+        int ret;
+
+        g_assert(words[1] && words[2]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &len);
+        g_assert(ret == 0);
+        /* We'd send garbage to libqtest if len is 0 */
+        g_assert(len);
+
+        data = g_malloc(len);
+        address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                           len);
+
+        enc = g_malloc(2 * len + 1);
+        for (i = 0; i < len; i++) {
+            sprintf(&enc[i * 2], "%02x", data[i]);
+        }
+
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK 0x%s\n", enc);
+
+        g_free(data);
+        g_free(enc);
+    } else if (strcmp(words[0], "b64read") == 0) {
+        uint64_t addr, len;
+        uint8_t *data;
+        gchar *b64_data;
+        int ret;
+
+        g_assert(words[1] && words[2]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &len);
+        g_assert(ret == 0);
+
+        data = g_malloc(len);
+        address_space_read(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                           len);
+        b64_data = g_base64_encode(data, len);
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK %s\n", b64_data);
+
+        g_free(data);
+        g_free(b64_data);
+    } else if (strcmp(words[0], "write") == 0) {
+        uint64_t addr, len, i;
+        uint8_t *data;
+        size_t data_len;
+        int ret;
+
+        g_assert(words[1] && words[2] && words[3]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &len);
+        g_assert(ret == 0);
+
+        data_len = strlen(words[3]);
+        if (data_len < 3) {
+            qtest_send(chr, "ERR invalid argument size\n");
+            return;
+        }
+
+        data = g_malloc(len);
+        for (i = 0; i < len; i++) {
+            if ((i * 2 + 4) <= data_len) {
+                data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
+                data[i] |= hex2nib(words[3][i * 2 + 3]);
+            } else {
+                data[i] = 0;
+            }
+        }
+        address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                            len);
+        g_free(data);
+
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "memset") == 0) {
+        uint64_t addr, len;
+        uint8_t *data;
+        unsigned long pattern;
+        int ret;
+
+        g_assert(words[1] && words[2] && words[3]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &len);
+        g_assert(ret == 0);
+        ret = qemu_strtoul(words[3], NULL, 0, &pattern);
+        g_assert(ret == 0);
+
+        if (len) {
+            data = g_malloc(len);
+            memset(data, pattern, len);
+            address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED,
+                                data, len);
+            g_free(data);
+        }
+
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    }  else if (strcmp(words[0], "b64write") == 0) {
+        uint64_t addr, len;
+        uint8_t *data;
+        size_t data_len;
+        gsize out_len;
+        int ret;
+
+        g_assert(words[1] && words[2] && words[3]);
+        ret = qemu_strtou64(words[1], NULL, 0, &addr);
+        g_assert(ret == 0);
+        ret = qemu_strtou64(words[2], NULL, 0, &len);
+        g_assert(ret == 0);
+
+        data_len = strlen(words[3]);
+        if (data_len < 3) {
+            qtest_send(chr, "ERR invalid argument size\n");
+            return;
+        }
+
+        data = g_base64_decode_inplace(words[3], &out_len);
+        if (out_len != len) {
+            qtest_log_send("b64write: data length mismatch (told %"PRIu64", "
+                           "found %zu)\n",
+                           len, out_len);
+            out_len = MIN(out_len, len);
+        }
+
+        address_space_write(first_cpu->as, addr, MEMTXATTRS_UNSPECIFIED, data,
+                            len);
+
+        qtest_send_prefix(chr);
+        qtest_send(chr, "OK\n");
+    } else if (strcmp(words[0], "endianness") == 0) {
+        qtest_send_prefix(chr);
+#if defined(TARGET_WORDS_BIGENDIAN)
+        qtest_sendf(chr, "OK big\n");
+#else
+        qtest_sendf(chr, "OK little\n");
+#endif
+#ifdef CONFIG_PSERIES
+    } else if (strcmp(words[0], "rtas") == 0) {
+        uint64_t res, args, ret;
+        unsigned long nargs, nret;
+        int rc;
+
+        rc = qemu_strtoul(words[2], NULL, 0, &nargs);
+        g_assert(rc == 0);
+        rc = qemu_strtou64(words[3], NULL, 0, &args);
+        g_assert(rc == 0);
+        rc = qemu_strtoul(words[4], NULL, 0, &nret);
+        g_assert(rc == 0);
+        rc = qemu_strtou64(words[5], NULL, 0, &ret);
+        g_assert(rc == 0);
+        res = qtest_rtas_call(words[1], nargs, args, nret, ret);
+
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK %"PRIu64"\n", res);
+#endif
+    } else if (qtest_enabled() && strcmp(words[0], "clock_step") == 0) {
+        int64_t ns;
+
+        if (words[1]) {
+            int ret = qemu_strtoi64(words[1], NULL, 0, &ns);
+            g_assert(ret == 0);
+        } else {
+            ns = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
+                                            QEMU_TIMER_ATTR_ALL);
+        }
+        qtest_clock_warp(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + ns);
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK %"PRIi64"\n",
+                    (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+    } else if (strcmp(words[0], "module_load") == 0) {
+        g_assert(words[1] && words[2]);
+
+        qtest_send_prefix(chr);
+        if (module_load_one(words[1], words[2], false)) {
+            qtest_sendf(chr, "OK\n");
+        } else {
+            qtest_sendf(chr, "FAIL\n");
+        }
+    } else if (qtest_enabled() && strcmp(words[0], "clock_set") == 0) {
+        int64_t ns;
+        int ret;
+
+        g_assert(words[1]);
+        ret = qemu_strtoi64(words[1], NULL, 0, &ns);
+        g_assert(ret == 0);
+        qtest_clock_warp(ns);
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "OK %"PRIi64"\n",
+                    (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+    } else {
+        qtest_send_prefix(chr);
+        qtest_sendf(chr, "FAIL Unknown command '%s'\n", words[0]);
+    }
+}
+
+static void qtest_process_inbuf(CharBackend *chr, GString *inbuf)
+{
+    char *end;
+
+    while ((end = strchr(inbuf->str, '\n')) != NULL) {
+        size_t offset;
+        GString *cmd;
+        gchar **words;
+
+        offset = end - inbuf->str;
+
+        cmd = g_string_new_len(inbuf->str, offset);
+        g_string_erase(inbuf, 0, offset + 1);
+
+        words = g_strsplit(cmd->str, " ", 0);
+        qtest_process_command(chr, words);
+        g_strfreev(words);
+
+        g_string_free(cmd, TRUE);
+    }
+}
+
+static void qtest_read(void *opaque, const uint8_t *buf, int size)
+{
+    CharBackend *chr = opaque;
+
+    g_string_append_len(inbuf, (const gchar *)buf, size);
+    qtest_process_inbuf(chr, inbuf);
+}
+
+static int qtest_can_read(void *opaque)
+{
+    return 1024;
+}
+
+static void qtest_event(void *opaque, QEMUChrEvent event)
+{
+    int i;
+
+    switch (event) {
+    case CHR_EVENT_OPENED:
+        /*
+         * We used to call qemu_system_reset() here, hoping we could
+         * use the same process for multiple tests that way.  Never
+         * used.  Injects an extra reset even when it's not used, and
+         * that can mess up tests, e.g. -boot once.
+         */
+        for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
+            irq_levels[i] = 0;
+        }
+        qemu_gettimeofday(&start_time);
+        qtest_opened = true;
+        if (qtest_log_fp) {
+            fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
+                    (long) start_time.tv_sec, (long) start_time.tv_usec);
+        }
+        break;
+    case CHR_EVENT_CLOSED:
+        qtest_opened = false;
+        if (qtest_log_fp) {
+            qemu_timeval tv;
+            qtest_get_time(&tv);
+            fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
+                    (long) tv.tv_sec, (long) tv.tv_usec);
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+void qtest_server_init(const char *qtest_chrdev, const char *qtest_log, Error **errp)
+{
+    ERRP_GUARD();
+    Chardev *chr;
+    Object *qtest;
+
+    chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
+    if (chr == NULL) {
+        error_setg(errp, "Failed to initialize device for qtest: \"%s\"",
+                   qtest_chrdev);
+        return;
+    }
+
+    qtest = object_new(TYPE_QTEST);
+    object_property_set_str(qtest, "chardev", "qtest", &error_abort);
+    if (qtest_log) {
+        object_property_set_str(qtest, "log", qtest_log, &error_abort);
+    }
+    object_property_add_child(qdev_get_machine(), "qtest", qtest);
+    user_creatable_complete(USER_CREATABLE(qtest), errp);
+    if (*errp) {
+        object_unparent(qtest);
+    }
+    object_unref(OBJECT(chr));
+    object_unref(qtest);
+}
+
+static bool qtest_server_start(QTest *q, Error **errp)
+{
+    Chardev *chr = q->chr;
+    const char *qtest_log = q->log;
+
+    if (qtest_log) {
+        if (strcmp(qtest_log, "none") != 0) {
+            qtest_log_fp = fopen(qtest_log, "w+");
+        }
+    } else {
+        qtest_log_fp = stderr;
+    }
+
+    if (!qemu_chr_fe_init(&q->qtest_chr, chr, errp)) {
+        return false;
+    }
+    qemu_chr_fe_set_handlers(&q->qtest_chr, qtest_can_read, qtest_read,
+                             qtest_event, NULL, &q->qtest_chr, NULL, true);
+    qemu_chr_fe_set_echo(&q->qtest_chr, true);
+
+    inbuf = g_string_new("");
+
+    if (!qtest_server_send) {
+        qtest_server_set_send_handler(qtest_server_char_be_send, &q->qtest_chr);
+    }
+    qtest = q;
+    return true;
+}
+
+void qtest_server_set_send_handler(void (*send)(void*, const char*),
+                                   void *opaque)
+{
+    qtest_server_send = send;
+    qtest_server_send_opaque = opaque;
+}
+
+bool qtest_driver(void)
+{
+    return qtest && qtest->qtest_chr.chr != NULL;
+}
+
+void qtest_server_inproc_recv(void *dummy, const char *buf)
+{
+    static GString *gstr;
+    if (!gstr) {
+        gstr = g_string_new(NULL);
+    }
+    g_string_append(gstr, buf);
+    if (gstr->str[gstr->len - 1] == '\n') {
+        qtest_process_inbuf(NULL, gstr);
+        g_string_truncate(gstr, 0);
+    }
+}
+
+static void qtest_complete(UserCreatable *uc, Error **errp)
+{
+    QTest *q = QTEST(uc);
+    if (qtest) {
+        error_setg(errp, "Only one instance of qtest can be created");
+        return;
+    }
+    if (!q->chr_name) {
+        error_setg(errp, "No backend specified");
+        return;
+    }
+
+    if (OBJECT(uc)->parent != qdev_get_machine()) {
+        q->has_machine_link = true;
+        object_property_add_const_link(qdev_get_machine(), "qtest", OBJECT(uc));
+    } else {
+        /* -qtest was used.  */
+    }
+
+    qtest_server_start(q, errp);
+}
+
+static void qtest_unparent(Object *obj)
+{
+    QTest *q = QTEST(obj);
+
+    if (qtest == q) {
+        qemu_chr_fe_disconnect(&q->qtest_chr);
+        assert(!qtest_opened);
+        qemu_chr_fe_deinit(&q->qtest_chr, false);
+        if (qtest_log_fp) {
+            fclose(qtest_log_fp);
+            qtest_log_fp = NULL;
+        }
+        qtest = NULL;
+    }
+
+    if (q->has_machine_link) {
+        object_property_del(qdev_get_machine(), "qtest");
+        q->has_machine_link = false;
+    }
+}
+
+static void qtest_set_log(Object *obj, const char *value, Error **errp)
+{
+    QTest *q = QTEST(obj);
+
+    if (qtest == q) {
+        error_setg(errp, QERR_PERMISSION_DENIED);
+    } else {
+        g_free(q->log);
+        q->log = g_strdup(value);
+    }
+}
+
+static char *qtest_get_log(Object *obj, Error **errp)
+{
+    QTest *q = QTEST(obj);
+
+    return g_strdup(q->log);
+}
+
+static void qtest_set_chardev(Object *obj, const char *value, Error **errp)
+{
+    QTest *q = QTEST(obj);
+    Chardev *chr;
+
+    if (qtest == q) {
+        error_setg(errp, QERR_PERMISSION_DENIED);
+        return;
+    }
+
+    chr = qemu_chr_find(value);
+    if (!chr) {
+        error_setg(errp, "Cannot find character device '%s'", value);
+        return;
+    }
+
+    g_free(q->chr_name);
+    q->chr_name = g_strdup(value);
+
+    if (q->chr) {
+        object_unref(q->chr);
+    }
+    q->chr = chr;
+    object_ref(chr);
+}
+
+static char *qtest_get_chardev(Object *obj, Error **errp)
+{
+    QTest *q = QTEST(obj);
+
+    return g_strdup(q->chr_name);
+}
+
+static void qtest_class_init(ObjectClass *oc, void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+
+    oc->unparent = qtest_unparent;
+    ucc->complete = qtest_complete;
+
+    object_class_property_add_str(oc, "chardev",
+                                  qtest_get_chardev, qtest_set_chardev);
+    object_class_property_add_str(oc, "log",
+                                  qtest_get_log, qtest_set_log);
+}
+
+static const TypeInfo qtest_info = {
+    .name = TYPE_QTEST,
+    .parent = TYPE_OBJECT,
+    .class_init = qtest_class_init,
+    .instance_size = sizeof(QTest),
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+static void register_types(void)
+{
+    type_register_static(&qtest_info);
+}
+
+type_init(register_types);