plugins: move the more involved plugins to contrib

We have an exploding complexity problem in the testing so lets just
move the more involved plugins into contrib. tests/plugins still exist
for the basic plugins that exercise the API. We restore the old
pre-meson style Makefile for contrib as it also doubles as a guide for
out-of-tree plugin builds.

While we are at it add some examples to the documentation and a
specific plugins build target.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200909112742.25730-11-alex.bennee@linaro.org>

5 files changed, 2 insertions, 1042 deletions

diff --git a/tests/plugin/hotblocks.c b/tests/plugin/hotblocks.c
deleted file mode 100644
index 3942a2c..0000000
--- a/tests/plugin/hotblocks.c
+++ /dev/null
@@ -1,145 +0,0 @@
-/*
- * Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
- *
- * License: GNU GPL, version 2 or later.
- *   See the COPYING file in the top-level directory.
- */
-#include <inttypes.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <inttypes.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <glib.h>
-
-#include <qemu-plugin.h>
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
-
-static bool do_inline;
-
-/* Plugins need to take care of their own locking */
-static GMutex lock;
-static GHashTable *hotblocks;
-static guint64 limit = 20;
-
-/*
- * Counting Structure
- *
- * The internals of the TCG are not exposed to plugins so we can only
- * get the starting PC for each block. We cheat this slightly by
- * xor'ing the number of instructions to the hash to help
- * differentiate.
- */
-typedef struct {
-    uint64_t start_addr;
-    uint64_t exec_count;
-    int      trans_count;
-    unsigned long insns;
-} ExecCount;
-
-static gint cmp_exec_count(gconstpointer a, gconstpointer b)
-{
-    ExecCount *ea = (ExecCount *) a;
-    ExecCount *eb = (ExecCount *) b;
-    return ea->exec_count > eb->exec_count ? -1 : 1;
-}
-
-static void plugin_exit(qemu_plugin_id_t id, void *p)
-{
-    g_autoptr(GString) report = g_string_new("collected ");
-    GList *counts, *it;
-    int i;
-
-    g_mutex_lock(&lock);
-    g_string_append_printf(report, "%d entries in the hash table\n",
-                           g_hash_table_size(hotblocks));
-    counts = g_hash_table_get_values(hotblocks);
-    it = g_list_sort(counts, cmp_exec_count);
-
-    if (it) {
-        g_string_append_printf(report, "pc, tcount, icount, ecount\n");
-
-        for (i = 0; i < limit && it->next; i++, it = it->next) {
-            ExecCount *rec = (ExecCount *) it->data;
-            g_string_append_printf(report, "%#016"PRIx64", %d, %ld, %"PRId64"\n",
-                                   rec->start_addr, rec->trans_count,
-                                   rec->insns, rec->exec_count);
-        }
-
-        g_list_free(it);
-        g_mutex_unlock(&lock);
-    }
-
-    qemu_plugin_outs(report->str);
-}
-
-static void plugin_init(void)
-{
-    hotblocks = g_hash_table_new(NULL, g_direct_equal);
-}
-
-static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
-{
-    ExecCount *cnt;
-    uint64_t hash = (uint64_t) udata;
-
-    g_mutex_lock(&lock);
-    cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
-    /* should always succeed */
-    g_assert(cnt);
-    cnt->exec_count++;
-    g_mutex_unlock(&lock);
-}
-
-/*
- * When do_inline we ask the plugin to increment the counter for us.
- * Otherwise a helper is inserted which calls the vcpu_tb_exec
- * callback.
- */
-static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
-{
-    ExecCount *cnt;
-    uint64_t pc = qemu_plugin_tb_vaddr(tb);
-    unsigned long insns = qemu_plugin_tb_n_insns(tb);
-    uint64_t hash = pc ^ insns;
-
-    g_mutex_lock(&lock);
-    cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
-    if (cnt) {
-        cnt->trans_count++;
-    } else {
-        cnt = g_new0(ExecCount, 1);
-        cnt->start_addr = pc;
-        cnt->trans_count = 1;
-        cnt->insns = insns;
-        g_hash_table_insert(hotblocks, (gpointer) hash, (gpointer) cnt);
-    }
-
-    g_mutex_unlock(&lock);
-
-    if (do_inline) {
-        qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
-                                                 &cnt->exec_count, 1);
-    } else {
-        qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
-                                             QEMU_PLUGIN_CB_NO_REGS,
-                                             (void *)hash);
-    }
-}
-
-QEMU_PLUGIN_EXPORT
-int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
-                        int argc, char **argv)
-{
-    if (argc && strcmp(argv[0], "inline") == 0) {
-        do_inline = true;
-    }
-
-    plugin_init();
-
-    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
-    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
-    return 0;
-}
diff --git a/tests/plugin/hotpages.c b/tests/plugin/hotpages.c
deleted file mode 100644
index ecd6c18..0000000
--- a/tests/plugin/hotpages.c
+++ /dev/null
@@ -1,193 +0,0 @@
-/*
- * Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
- *
- * Hot Pages - show which pages saw the most memory accesses.
- *
- * License: GNU GPL, version 2 or later.
- *   See the COPYING file in the top-level directory.
- */
-
-#include <inttypes.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <inttypes.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <glib.h>
-
-#include <qemu-plugin.h>
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
-static uint64_t page_size = 4096;
-static uint64_t page_mask;
-static int limit = 50;
-static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
-static bool track_io;
-
-enum sort_type {
-    SORT_RW = 0,
-    SORT_R,
-    SORT_W,
-    SORT_A
-};
-
-static int sort_by = SORT_RW;
-
-typedef struct {
-    uint64_t page_address;
-    int cpu_read;
-    int cpu_write;
-    uint64_t reads;
-    uint64_t writes;
-} PageCounters;
-
-static GMutex lock;
-static GHashTable *pages;
-
-static gint cmp_access_count(gconstpointer a, gconstpointer b)
-{
-    PageCounters *ea = (PageCounters *) a;
-    PageCounters *eb = (PageCounters *) b;
-    int r;
-    switch (sort_by) {
-    case SORT_RW:
-        r = (ea->reads + ea->writes) > (eb->reads + eb->writes) ? -1 : 1;
-        break;
-    case SORT_R:
-        r = ea->reads > eb->reads ? -1 : 1;
-        break;
-    case SORT_W:
-        r = ea->writes > eb->writes ? -1 : 1;
-        break;
-    case SORT_A:
-        r = ea->page_address > eb->page_address ? -1 : 1;
-        break;
-    default:
-        g_assert_not_reached();
-    }
-    return r;
-}
-
-
-static void plugin_exit(qemu_plugin_id_t id, void *p)
-{
-    g_autoptr(GString) report = g_string_new("Addr, RCPUs, Reads, WCPUs, Writes\n");
-    int i;
-    GList *counts;
-
-    counts = g_hash_table_get_values(pages);
-    if (counts && g_list_next(counts)) {
-        GList *it;
-
-        it = g_list_sort(counts, cmp_access_count);
-
-        for (i = 0; i < limit && it->next; i++, it = it->next) {
-            PageCounters *rec = (PageCounters *) it->data;
-            g_string_append_printf(report,
-                                   "%#016"PRIx64", 0x%04x, %"PRId64
-                                   ", 0x%04x, %"PRId64"\n",
-                                   rec->page_address,
-                                   rec->cpu_read, rec->reads,
-                                   rec->cpu_write, rec->writes);
-        }
-        g_list_free(it);
-    }
-
-    qemu_plugin_outs(report->str);
-}
-
-static void plugin_init(void)
-{
-    page_mask = (page_size - 1);
-    pages = g_hash_table_new(NULL, g_direct_equal);
-}
-
-static void vcpu_haddr(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
-                       uint64_t vaddr, void *udata)
-{
-    struct qemu_plugin_hwaddr *hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
-    uint64_t page;
-    PageCounters *count;
-
-    /* We only get a hwaddr for system emulation */
-    if (track_io) {
-        if (hwaddr && qemu_plugin_hwaddr_is_io(hwaddr)) {
-            page = vaddr;
-        } else {
-            return;
-        }
-    } else {
-        if (hwaddr && !qemu_plugin_hwaddr_is_io(hwaddr)) {
-            page = (uint64_t) qemu_plugin_hwaddr_device_offset(hwaddr);
-        } else {
-            page = vaddr;
-        }
-    }
-    page &= ~page_mask;
-
-    g_mutex_lock(&lock);
-    count = (PageCounters *) g_hash_table_lookup(pages, GUINT_TO_POINTER(page));
-
-    if (!count) {
-        count = g_new0(PageCounters, 1);
-        count->page_address = page;
-        g_hash_table_insert(pages, GUINT_TO_POINTER(page), (gpointer) count);
-    }
-    if (qemu_plugin_mem_is_store(meminfo)) {
-        count->writes++;
-        count->cpu_write |= (1 << cpu_index);
-    } else {
-        count->reads++;
-        count->cpu_read |= (1 << cpu_index);
-    }
-
-    g_mutex_unlock(&lock);
-}
-
-static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
-{
-    size_t n = qemu_plugin_tb_n_insns(tb);
-    size_t i;
-
-    for (i = 0; i < n; i++) {
-        struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
-        qemu_plugin_register_vcpu_mem_cb(insn, vcpu_haddr,
-                                         QEMU_PLUGIN_CB_NO_REGS,
-                                         rw, NULL);
-    }
-}
-
-QEMU_PLUGIN_EXPORT
-int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
-                        int argc, char **argv)
-{
-    int i;
-
-    for (i = 0; i < argc; i++) {
-        char *opt = argv[i];
-        if (g_strcmp0(opt, "reads") == 0) {
-            sort_by = SORT_R;
-        } else if (g_strcmp0(opt, "writes") == 0) {
-            sort_by = SORT_W;
-        } else if (g_strcmp0(opt, "address") == 0) {
-            sort_by = SORT_A;
-        } else if (g_strcmp0(opt, "io") == 0) {
-            track_io = true;
-        } else if (g_str_has_prefix(opt, "pagesize=")) {
-            page_size = g_ascii_strtoull(opt + 9, NULL, 10);
-        } else {
-            fprintf(stderr, "option parsing failed: %s\n", opt);
-            return -1;
-        }
-    }
-
-    plugin_init();
-
-    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
-    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
-    return 0;
-}
diff --git a/tests/plugin/howvec.c b/tests/plugin/howvec.c
deleted file mode 100644
index 3b9a693..0000000
--- a/tests/plugin/howvec.c
+++ /dev/null
@@ -1,362 +0,0 @@
-/*
- * Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
- *
- * How vectorised is this code?
- *
- * Attempt to measure the amount of vectorisation that has been done
- * on some code by counting classes of instruction.
- *
- * License: GNU GPL, version 2 or later.
- *   See the COPYING file in the top-level directory.
- */
-#include <inttypes.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <inttypes.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <glib.h>
-
-#include <qemu-plugin.h>
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
-typedef enum {
-    COUNT_CLASS,
-    COUNT_INDIVIDUAL,
-    COUNT_NONE
-} CountType;
-
-static int limit = 50;
-static bool do_inline;
-static bool verbose;
-
-static GMutex lock;
-static GHashTable *insns;
-
-typedef struct {
-    const char *class;
-    const char *opt;
-    uint32_t mask;
-    uint32_t pattern;
-    CountType what;
-    uint64_t count;
-} InsnClassExecCount;
-
-typedef struct {
-    char *insn;
-    uint32_t opcode;
-    uint64_t count;
-    InsnClassExecCount *class;
-} InsnExecCount;
-
-/*
- * Matchers for classes of instructions, order is important.
- *
- * Your most precise match must be before looser matches. If no match
- * is found in the table we can create an individual entry.
- *
- * 31..28 27..24 23..20 19..16 15..12 11..8 7..4 3..0
- */
-static InsnClassExecCount aarch64_insn_classes[] = {
-    /* "Reserved"" */
-    { "  UDEF",              "udef",   0xffff0000, 0x00000000, COUNT_NONE},
-    { "  SVE",               "sve",    0x1e000000, 0x04000000, COUNT_CLASS},
-    { "Reserved",            "res",    0x1e000000, 0x00000000, COUNT_CLASS},
-    /* Data Processing Immediate */
-    { "  PCrel addr",        "pcrel",  0x1f000000, 0x10000000, COUNT_CLASS},
-    { "  Add/Sub (imm,tags)","asit",   0x1f800000, 0x11800000, COUNT_CLASS},
-    { "  Add/Sub (imm)",     "asi",    0x1f000000, 0x11000000, COUNT_CLASS},
-    { "  Logical (imm)",     "logi",   0x1f800000, 0x12000000, COUNT_CLASS},
-    { "  Move Wide (imm)",   "movwi",  0x1f800000, 0x12800000, COUNT_CLASS},
-    { "  Bitfield",          "bitf",   0x1f800000, 0x13000000, COUNT_CLASS},
-    { "  Extract",           "extr",   0x1f800000, 0x13800000, COUNT_CLASS},
-    { "Data Proc Imm",       "dpri",   0x1c000000, 0x10000000, COUNT_CLASS},
-    /* Branches */
-    { "  Cond Branch (imm)", "cndb",   0xfe000000, 0x54000000, COUNT_CLASS},
-    { "  Exception Gen",     "excp",   0xff000000, 0xd4000000, COUNT_CLASS},
-    { "    NOP",             "nop",    0xffffffff, 0xd503201f, COUNT_NONE},
-    { "  Hints",             "hint",   0xfffff000, 0xd5032000, COUNT_CLASS},
-    { "  Barriers",          "barr",   0xfffff000, 0xd5033000, COUNT_CLASS},
-    { "  PSTATE",            "psta",   0xfff8f000, 0xd5004000, COUNT_CLASS},
-    { "  System Insn",       "sins",   0xffd80000, 0xd5080000, COUNT_CLASS},
-    { "  System Reg",        "sreg",   0xffd00000, 0xd5100000, COUNT_CLASS},
-    { "  Branch (reg)",      "breg",   0xfe000000, 0xd6000000, COUNT_CLASS},
-    { "  Branch (imm)",      "bimm",   0x7c000000, 0x14000000, COUNT_CLASS},
-    { "  Cmp & Branch",      "cmpb",   0x7e000000, 0x34000000, COUNT_CLASS},
-    { "  Tst & Branch",      "tstb",   0x7e000000, 0x36000000, COUNT_CLASS},
-    { "Branches",            "branch", 0x1c000000, 0x14000000, COUNT_CLASS},
-    /* Loads and Stores */
-    { "  AdvSimd ldstmult",  "advlsm", 0xbfbf0000, 0x0c000000, COUNT_CLASS},
-    { "  AdvSimd ldstmult++","advlsmp",0xbfb00000, 0x0c800000, COUNT_CLASS},
-    { "  AdvSimd ldst",      "advlss", 0xbf9f0000, 0x0d000000, COUNT_CLASS},
-    { "  AdvSimd ldst++",    "advlssp",0xbf800000, 0x0d800000, COUNT_CLASS},
-    { "  ldst excl",         "ldstx",  0x3f000000, 0x08000000, COUNT_CLASS},
-    { "    Prefetch",        "prfm",   0xff000000, 0xd8000000, COUNT_CLASS},
-    { "  Load Reg (lit)",    "ldlit",  0x1b000000, 0x18000000, COUNT_CLASS},
-    { "  ldst noalloc pair", "ldstnap",0x3b800000, 0x28000000, COUNT_CLASS},
-    { "  ldst pair",         "ldstp",  0x38000000, 0x28000000, COUNT_CLASS},
-    { "  ldst reg",          "ldstr",  0x3b200000, 0x38000000, COUNT_CLASS},
-    { "  Atomic ldst",       "atomic", 0x3b200c00, 0x38200000, COUNT_CLASS},
-    { "  ldst reg (reg off)","ldstro", 0x3b200b00, 0x38200800, COUNT_CLASS},
-    { "  ldst reg (pac)",    "ldstpa", 0x3b200200, 0x38200800, COUNT_CLASS},
-    { "  ldst reg (imm)",    "ldsti",  0x3b000000, 0x39000000, COUNT_CLASS},
-    { "Loads & Stores",      "ldst",   0x0a000000, 0x08000000, COUNT_CLASS},
-    /* Data Processing Register */
-    { "Data Proc Reg",       "dprr",   0x0e000000, 0x0a000000, COUNT_CLASS},
-    /* Scalar FP */
-    { "Scalar FP ",          "fpsimd", 0x0e000000, 0x0e000000, COUNT_CLASS},
-    /* Unclassified */
-    { "Unclassified",        "unclas", 0x00000000, 0x00000000, COUNT_CLASS},
-};
-
-static InsnClassExecCount sparc32_insn_classes[] = {
-    { "Call",                "call",   0xc0000000, 0x40000000, COUNT_CLASS},
-    { "Branch ICond",        "bcc",    0xc1c00000, 0x00800000, COUNT_CLASS},
-    { "Branch Fcond",        "fbcc",   0xc1c00000, 0x01800000, COUNT_CLASS},
-    { "SetHi",               "sethi",  0xc1c00000, 0x01000000, COUNT_CLASS},
-    { "FPU ALU",             "fpu",    0xc1f00000, 0x81a00000, COUNT_CLASS},
-    { "ALU",                 "alu",    0xc0000000, 0x80000000, COUNT_CLASS},
-    { "Load/Store",          "ldst",   0xc0000000, 0xc0000000, COUNT_CLASS},
-    /* Unclassified */
-    { "Unclassified",        "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL},
-};
-
-static InsnClassExecCount sparc64_insn_classes[] = {
-    { "SetHi & Branches",     "op0",   0xc0000000, 0x00000000, COUNT_CLASS},
-    { "Call",                 "op1",   0xc0000000, 0x40000000, COUNT_CLASS},
-    { "Arith/Logical/Move",   "op2",   0xc0000000, 0x80000000, COUNT_CLASS},
-    { "Arith/Logical/Move",   "op3",   0xc0000000, 0xc0000000, COUNT_CLASS},
-    /* Unclassified */
-    { "Unclassified",        "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL},
-};
-
-/* Default matcher for currently unclassified architectures */
-static InsnClassExecCount default_insn_classes[] = {
-    { "Unclassified",        "unclas", 0x00000000, 0x00000000, COUNT_INDIVIDUAL},
-};
-
-typedef struct {
-    const char *qemu_target;
-    InsnClassExecCount *table;
-    int table_sz;
-} ClassSelector;
-
-static ClassSelector class_tables[] =
-{
-    { "aarch64", aarch64_insn_classes, ARRAY_SIZE(aarch64_insn_classes) },
-    { "sparc",   sparc32_insn_classes, ARRAY_SIZE(sparc32_insn_classes) },
-    { "sparc64", sparc64_insn_classes, ARRAY_SIZE(sparc64_insn_classes) },
-    { NULL, default_insn_classes, ARRAY_SIZE(default_insn_classes) },
-};
-
-static InsnClassExecCount *class_table;
-static int class_table_sz;
-
-static gint cmp_exec_count(gconstpointer a, gconstpointer b)
-{
-    InsnExecCount *ea = (InsnExecCount *) a;
-    InsnExecCount *eb = (InsnExecCount *) b;
-    return ea->count > eb->count ? -1 : 1;
-}
-
-static void free_record(gpointer data)
-{
-    InsnExecCount *rec = (InsnExecCount *) data;
-    g_free(rec->insn);
-    g_free(rec);
-}
-
-static void plugin_exit(qemu_plugin_id_t id, void *p)
-{
-    g_autoptr(GString) report = g_string_new("Instruction Classes:\n");
-    int i;
-    GList *counts;
-    InsnClassExecCount *class = NULL;
-
-    for (i = 0; i < class_table_sz; i++) {
-        class = &class_table[i];
-        switch (class->what) {
-        case COUNT_CLASS:
-            if (class->count || verbose) {
-                g_string_append_printf(report, "Class: %-24s\t(%ld hits)\n",
-                                       class->class,
-                                       class->count);
-            }
-            break;
-        case COUNT_INDIVIDUAL:
-            g_string_append_printf(report, "Class: %-24s\tcounted individually\n",
-                                   class->class);
-            break;
-        case COUNT_NONE:
-            g_string_append_printf(report, "Class: %-24s\tnot counted\n",
-                                   class->class);
-            break;
-        default:
-            break;
-        }
-    }
-
-    counts = g_hash_table_get_values(insns);
-    if (counts && g_list_next(counts)) {
-        g_string_append_printf(report,"Individual Instructions:\n");
-        counts = g_list_sort(counts, cmp_exec_count);
-
-        for (i = 0; i < limit && g_list_next(counts);
-             i++, counts = g_list_next(counts)) {
-            InsnExecCount *rec = (InsnExecCount *) counts->data;
-            g_string_append_printf(report,
-                                   "Instr: %-24s\t(%ld hits)\t(op=%#08x/%s)\n",
-                                   rec->insn,
-                                   rec->count,
-                                   rec->opcode,
-                                   rec->class ?
-                                   rec->class->class : "un-categorised");
-        }
-        g_list_free(counts);
-    }
-
-    g_hash_table_destroy(insns);
-
-    qemu_plugin_outs(report->str);
-}
-
-static void plugin_init(void)
-{
-    insns = g_hash_table_new_full(NULL, g_direct_equal, NULL, &free_record);
-}
-
-static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
-{
-    uint64_t *count = (uint64_t *) udata;
-    (*count)++;
-}
-
-static uint64_t * find_counter(struct qemu_plugin_insn *insn)
-{
-    int i;
-    uint64_t *cnt = NULL;
-    uint32_t opcode;
-    InsnClassExecCount *class = NULL;
-
-    /*
-     * We only match the first 32 bits of the instruction which is
-     * fine for most RISCs but a bit limiting for CISC architectures.
-     * They would probably benefit from a more tailored plugin.
-     * However we can fall back to individual instruction counting.
-     */
-    opcode = *((uint32_t *)qemu_plugin_insn_data(insn));
-
-    for (i = 0; !cnt && i < class_table_sz; i++) {
-        class = &class_table[i];
-        uint32_t masked_bits = opcode & class->mask;
-        if (masked_bits == class->pattern) {
-            break;
-        }
-    }
-
-    g_assert(class);
-
-    switch (class->what) {
-    case COUNT_NONE:
-        return NULL;
-    case COUNT_CLASS:
-        return &class->count;
-    case COUNT_INDIVIDUAL:
-    {
-        InsnExecCount *icount;
-
-        g_mutex_lock(&lock);
-        icount = (InsnExecCount *) g_hash_table_lookup(insns,
-                                                       GUINT_TO_POINTER(opcode));
-
-        if (!icount) {
-            icount = g_new0(InsnExecCount, 1);
-            icount->opcode = opcode;
-            icount->insn = qemu_plugin_insn_disas(insn);
-            icount->class = class;
-
-            g_hash_table_insert(insns, GUINT_TO_POINTER(opcode),
-                                (gpointer) icount);
-        }
-        g_mutex_unlock(&lock);
-
-        return &icount->count;
-    }
-    default:
-        g_assert_not_reached();
-    }
-
-    return NULL;
-}
-
-static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
-{
-    size_t n = qemu_plugin_tb_n_insns(tb);
-    size_t i;
-
-    for (i = 0; i < n; i++) {
-        uint64_t *cnt;
-        struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
-        cnt = find_counter(insn);
-
-        if (cnt) {
-            if (do_inline) {
-                qemu_plugin_register_vcpu_insn_exec_inline(
-                    insn, QEMU_PLUGIN_INLINE_ADD_U64, cnt, 1);
-            } else {
-                qemu_plugin_register_vcpu_insn_exec_cb(
-                    insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, cnt);
-            }
-        }
-    }
-}
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
-                                           const qemu_info_t *info,
-                                           int argc, char **argv)
-{
-    int i;
-
-    /* Select a class table appropriate to the guest architecture */
-    for (i = 0; i < ARRAY_SIZE(class_tables); i++) {
-        ClassSelector *entry = &class_tables[i];
-        if (!entry->qemu_target ||
-            strcmp(entry->qemu_target, info->target_name) == 0) {
-            class_table = entry->table;
-            class_table_sz = entry->table_sz;
-            break;
-        }
-    }
-
-    for (i = 0; i < argc; i++) {
-        char *p = argv[i];
-        if (strcmp(p, "inline") == 0) {
-            do_inline = true;
-        } else if (strcmp(p, "verbose") == 0) {
-            verbose = true;
-        } else {
-            int j;
-            CountType type = COUNT_INDIVIDUAL;
-            if (*p == '!') {
-                type = COUNT_NONE;
-                p++;
-            }
-            for (j = 0; j < class_table_sz; j++) {
-                if (strcmp(p, class_table[j].opt) == 0) {
-                    class_table[j].what = type;
-                    break;
-                }
-            }
-        }
-    }
-
-    plugin_init();
-
-    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
-    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
-    return 0;
-}
diff --git a/tests/plugin/lockstep.c b/tests/plugin/lockstep.c
deleted file mode 100644
index a696673..0000000
--- a/tests/plugin/lockstep.c
+++ /dev/null
@@ -1,340 +0,0 @@
-/*
- * Lockstep Execution Plugin
- *
- * Allows you to execute two QEMU instances in lockstep and report
- * when their execution diverges. This is mainly useful for developers
- * who want to see where a change to TCG code generation has
- * introduced a subtle and hard to find bug.
- *
- * Caveats:
- *   - single-threaded linux-user apps only with non-deterministic syscalls
- *   - no MTTCG enabled system emulation (icount may help)
- *
- * While icount makes things more deterministic it doesn't mean a
- * particular run may execute the exact same sequence of blocks. An
- * asynchronous event (for example X11 graphics update) may cause a
- * block to end early and a new partial block to start. This means
- * serial only test cases are a better bet. -d nochain may also help.
- *
- * This code is not thread safe!
- *
- * Copyright (c) 2020 Linaro Ltd
- *
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-#include <glib.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <stdio.h>
-#include <errno.h>
-
-#include <qemu-plugin.h>
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
-
-/* saved so we can uninstall later */
-static qemu_plugin_id_t our_id;
-
-static unsigned long bb_count;
-static unsigned long insn_count;
-
-/* Information about a translated block */
-typedef struct {
-    uint64_t pc;
-    uint64_t insns;
-} BlockInfo;
-
-/* Information about an execution state in the log */
-typedef struct {
-    BlockInfo *block;
-    unsigned long insn_count;
-    unsigned long block_count;
-} ExecInfo;
-
-/* The execution state we compare */
-typedef struct {
-    uint64_t pc;
-    unsigned long insn_count;
-} ExecState;
-
-typedef struct {
-    GSList *log_pos;
-    int distance;
-} DivergeState;
-
-/* list of translated block info */
-static GSList *blocks;
-
-/* execution log and points of divergence */
-static GSList *log, *divergence_log;
-
-static int socket_fd;
-static char *path_to_unlink;
-
-static bool verbose;
-
-static void plugin_cleanup(qemu_plugin_id_t id)
-{
-    /* Free our block data */
-    g_slist_free_full(blocks, &g_free);
-    g_slist_free_full(log, &g_free);
-    g_slist_free(divergence_log);
-
-    close(socket_fd);
-    if (path_to_unlink) {
-        unlink(path_to_unlink);
-    }
-}
-
-static void plugin_exit(qemu_plugin_id_t id, void *p)
-{
-    g_autoptr(GString) out = g_string_new("No divergence :-)\n");
-    g_string_append_printf(out, "Executed %ld/%d blocks\n",
-                           bb_count, g_slist_length(log));
-    g_string_append_printf(out, "Executed ~%ld instructions\n", insn_count);
-    qemu_plugin_outs(out->str);
-
-    plugin_cleanup(id);
-}
-
-static void report_divergance(ExecState *us, ExecState *them)
-{
-    DivergeState divrec = { log, 0 };
-    g_autoptr(GString) out = g_string_new("");
-    bool diverged = false;
-
-    /*
-     * If we have diverged before did we get back on track or are we
-     * totally loosing it?
-     */
-    if (divergence_log) {
-        DivergeState *last = (DivergeState *) divergence_log->data;
-        GSList *entry;
-
-        for (entry = log; g_slist_next(entry); entry = g_slist_next(entry)) {
-            if (entry == last->log_pos) {
-                break;
-            }
-            divrec.distance++;
-        }
-
-        /*
-         * If the last two records are so close it is likely we will
-         * not recover synchronisation with the other end.
-         */
-        if (divrec.distance == 1 && last->distance == 1) {
-            diverged = true;
-        }
-    }
-    divergence_log = g_slist_prepend(divergence_log,
-                                     g_memdup(&divrec, sizeof(divrec)));
-
-    /* Output short log entry of going out of sync... */
-    if (verbose || divrec.distance == 1 || diverged) {
-        g_string_printf(out, "@ %#016lx vs %#016lx (%d/%d since last)\n",
-                        us->pc, them->pc, g_slist_length(divergence_log),
-                        divrec.distance);
-        qemu_plugin_outs(out->str);
-    }
-
-    if (diverged) {
-        int i;
-        GSList *entry;
-
-        g_string_printf(out, "Δ insn_count @ %#016lx (%ld) vs %#016lx (%ld)\n",
-                        us->pc, us->insn_count, them->pc, them->insn_count);
-
-        for (entry = log, i = 0;
-             g_slist_next(entry) && i < 5;
-             entry = g_slist_next(entry), i++) {
-            ExecInfo *prev = (ExecInfo *) entry->data;
-            g_string_append_printf(out,
-                                   "  previously @ %#016lx/%ld (%ld insns)\n",
-                                   prev->block->pc, prev->block->insns,
-                                   prev->insn_count);
-        }
-        qemu_plugin_outs(out->str);
-        qemu_plugin_outs("too much divergence... giving up.");
-        qemu_plugin_uninstall(our_id, plugin_cleanup);
-    }
-}
-
-static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
-{
-    BlockInfo *bi = (BlockInfo *) udata;
-    ExecState us, them;
-    ssize_t bytes;
-    ExecInfo *exec;
-
-    us.pc = bi->pc;
-    us.insn_count = insn_count;
-
-    /*
-     * Write our current position to the other end. If we fail the
-     * other end has probably died and we should shut down gracefully.
-     */
-    bytes = write(socket_fd, &us, sizeof(ExecState));
-    if (bytes < sizeof(ExecState)) {
-        qemu_plugin_outs(bytes < 0 ?
-                         "problem writing to socket" :
-                         "wrote less than expected to socket");
-        qemu_plugin_uninstall(our_id, plugin_cleanup);
-        return;
-    }
-
-    /*
-     * Now read where our peer has reached. Again a failure probably
-     * indicates the other end died and we should close down cleanly.
-     */
-    bytes = read(socket_fd, &them, sizeof(ExecState));
-    if (bytes < sizeof(ExecState)) {
-        qemu_plugin_outs(bytes < 0 ?
-                         "problem reading from socket" :
-                         "read less than expected");
-        qemu_plugin_uninstall(our_id, plugin_cleanup);
-        return;
-    }
-
-    /*
-     * Compare and report if we have diverged.
-     */
-    if (us.pc != them.pc) {
-        report_divergance(&us, &them);
-    }
-
-    /*
-     * Assume this block will execute fully and record it
-     * in the execution log.
-     */
-    insn_count += bi->insns;
-    bb_count++;
-    exec = g_new0(ExecInfo, 1);
-    exec->block = bi;
-    exec->insn_count = insn_count;
-    exec->block_count = bb_count;
-    log = g_slist_prepend(log, exec);
-}
-
-static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
-{
-    BlockInfo *bi = g_new0(BlockInfo, 1);
-    bi->pc = qemu_plugin_tb_vaddr(tb);
-    bi->insns = qemu_plugin_tb_n_insns(tb);
-
-    /* save a reference so we can free later */
-    blocks = g_slist_prepend(blocks, bi);
-    qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
-                                         QEMU_PLUGIN_CB_NO_REGS, (void *)bi);
-}
-
-
-/*
- * Instead of encoding master/slave status into what is essentially
- * two peers we shall just take the simple approach of checking for
- * the existence of the pipe and assuming if it's not there we are the
- * first process.
- */
-static bool setup_socket(const char *path)
-{
-    struct sockaddr_un sockaddr;
-    int fd;
-
-    fd = socket(AF_UNIX, SOCK_STREAM, 0);
-    if (fd < 0) {
-        perror("create socket");
-        return false;
-    }
-
-    sockaddr.sun_family = AF_UNIX;
-    g_strlcpy(sockaddr.sun_path, path, sizeof(sockaddr.sun_path) - 1);
-    if (bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) < 0) {
-        perror("bind socket");
-        close(fd);
-        return false;
-    }
-
-    /* remember to clean-up */
-    path_to_unlink = g_strdup(path);
-
-    if (listen(fd, 1) < 0) {
-        perror("listen socket");
-        close(fd);
-        return false;
-    }
-
-    socket_fd = accept(fd, NULL, NULL);
-    if (socket_fd < 0 && errno != EINTR) {
-        perror("accept socket");
-        return false;
-    }
-
-    qemu_plugin_outs("setup_socket::ready\n");
-
-    return true;
-}
-
-static bool connect_socket(const char *path)
-{
-    int fd;
-    struct sockaddr_un sockaddr;
-
-    fd = socket(AF_UNIX, SOCK_STREAM, 0);
-    if (fd < 0) {
-        perror("create socket");
-        return false;
-    }
-
-    sockaddr.sun_family = AF_UNIX;
-    g_strlcpy(sockaddr.sun_path, path, sizeof(sockaddr.sun_path) - 1);
-
-    if (connect(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)) < 0) {
-        perror("failed to connect");
-        return false;
-    }
-
-    qemu_plugin_outs("connect_socket::ready\n");
-
-    socket_fd = fd;
-    return true;
-}
-
-static bool setup_unix_socket(const char *path)
-{
-    if (g_file_test(path, G_FILE_TEST_EXISTS)) {
-        return connect_socket(path);
-    } else {
-        return setup_socket(path);
-    }
-}
-
-
-QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
-                                           const qemu_info_t *info,
-                                           int argc, char **argv)
-{
-    int i;
-
-    if (!argc || !argv[0]) {
-        qemu_plugin_outs("Need a socket path to talk to other instance.");
-        return -1;
-    }
-
-    for (i = 0; i < argc; i++) {
-        char *p = argv[i];
-        if (strcmp(p, "verbose") == 0) {
-            verbose = true;
-        } else if (!setup_unix_socket(argv[0])) {
-            qemu_plugin_outs("Failed to setup socket for communications.");
-            return -1;
-        }
-    }
-
-    our_id = id;
-
-    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
-    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
-    return 0;
-}
diff --git a/tests/plugin/meson.build b/tests/plugin/meson.build
index dbbdcba..1eacfa6 100644
--- a/tests/plugin/meson.build
+++ b/tests/plugin/meson.build
@@ -1,7 +1,7 @@
 t = []
-foreach i : ['bb', 'empty', 'insn', 'mem', 'hotblocks', 'howvec', 'hotpages', 'lockstep']
+foreach i : ['bb', 'empty', 'insn', 'mem']
   t += shared_module(i, files(i + '.c'),
                      include_directories: '../../include/qemu',
                      dependencies: glib)
 endforeach
-alias_target('plugins', t)
+alias_target('test-plugins', t)