[Qemu-devel] [PATCH v2 0/8] UUID clean ups for 2.8

[Qemu-devel] [PATCH v2 0/8] UUID clean ups for 2.8

[Fam Zheng]

v2: Fix the endianness wrongness. [Jeff]
    Add tests/test-uuid.c. [Denial]
    Add r-b of Stefan Weil to the VDI patch.

The facts how we use libuuid now are not particularly pleasant.

- VHDX driver depends on uuid, but is unconditionally checked in iotests 109.
  If it is not built, the test would fail, leaving no hint about that. In fact
  this even makes the feature implementation a bit ugly because it compromises
  the write protection on block 0 with image probing, silently.

- A few other libuuid users, in block/ and crypto/, use it as an optional
  dependency, and compromises certain functionalities if it is not available.

- On the other hand, there are already a few uuid function fallbacks in those
  callers.

So instead of making libuuid a hard requirement, let's simply move the
fallbacks to util and implement the random version of uuid generation, and be
done with it.

Fam

Fam Zheng (8):
  util: Add UUID API
  tests: Add uuid tests
  vhdx: Use QEMU UUID API
  vdi: Use QEMU UUID API
  vpc: Use QEMU UUID API
  crypto: Switch to QEMU UUID API
  tests: No longer dependent on CONFIG_UUID
  configure: Remove detection code for UUID

 arch_init.c               |  19 --------
 block/Makefile.objs       |   2 +-
 block/iscsi.c             |   2 +-
 block/vdi.c               |  49 +++++----------------
 block/vhdx-endian.c       |   3 --
 block/vhdx.c              |   7 ++-
 block/vpc.c               |   8 +---
 configure                 |  70 +++--------------------------
 crypto/block-luks.c       |  26 +++--------
 hw/smbios/smbios.c        |   1 +
 include/qemu/uuid.h       |  40 +++++++++++++++++
 include/sysemu/sysemu.h   |   4 --
 qmp.c                     |   1 +
 stubs/uuid.c              |   2 +-
 tests/Makefile.include    |   2 +
 tests/test-crypto-block.c |   2 +-
 tests/test-uuid.c         | 110 ++++++++++++++++++++++++++++++++++++++++++++++
 util/Makefile.objs        |   1 +
 util/uuid.c               |  68 ++++++++++++++++++++++++++++
 vl.c                      |   1 +
 20 files changed, 257 insertions(+), 161 deletions(-)
 create mode 100644 include/qemu/uuid.h
 create mode 100644 tests/test-uuid.c
 create mode 100644 util/uuid.c

-- 
2.7.4

[Qemu-devel] [PATCH v2 1/8] util: Add UUID API

[Fam Zheng]

A number of different places across the code base use CONFIG_UUID. Some
of them are soft dependency, some are not built if libuuid is not
available, some come with dummy fallback, some throws runtime error.

It is hard to maintain, and hard to reason for users.

Since UUID is a simple standard with only a small number of operations,
it is cleaner to have a central support in libqemuutil. This patch adds
qemu_uuid_* the functions so that all uuid users in the code base can
rely on. Except for qemu_uuid_generate which is new code, all other
functions are just copy from existing fallbacks from other files.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 arch_init.c             | 19 --------------
 block/iscsi.c           |  2 +-
 hw/smbios/smbios.c      |  1 +
 include/qemu/uuid.h     | 40 +++++++++++++++++++++++++++++
 include/sysemu/sysemu.h |  4 ---
 qmp.c                   |  1 +
 stubs/uuid.c            |  2 +-
 util/Makefile.objs      |  1 +
 util/uuid.c             | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
 vl.c                    |  1 +
 10 files changed, 114 insertions(+), 25 deletions(-)
 create mode 100644 include/qemu/uuid.h
 create mode 100644 util/uuid.c

diff --git a/arch_init.c b/arch_init.c
index fa05973..5cc58b2 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -235,25 +235,6 @@ void audio_init(void)
     }
 }
 
-int qemu_uuid_parse(const char *str, uint8_t *uuid)
-{
-    int ret;
-
-    if (strlen(str) != 36) {
-        return -1;
-    }
-
-    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
-                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
-                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
-                 &uuid[15]);
-
-    if (ret != 16) {
-        return -1;
-    }
-    return 0;
-}
-
 void do_acpitable_option(const QemuOpts *opts)
 {
 #ifdef TARGET_I386
diff --git a/block/iscsi.c b/block/iscsi.c
index 95ce9e1..961ac76 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -36,7 +36,7 @@
 #include "block/block_int.h"
 #include "block/scsi.h"
 #include "qemu/iov.h"
-#include "sysemu/sysemu.h"
+#include "qemu/uuid.h"
 #include "qmp-commands.h"
 #include "qapi/qmp/qstring.h"
 #include "crypto/secret.h"
diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 74c7102..0705eb1 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -20,6 +20,7 @@
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "sysemu/sysemu.h"
+#include "qemu/uuid.h"
 #include "sysemu/cpus.h"
 #include "hw/smbios/smbios.h"
 #include "hw/loader.h"
diff --git a/include/qemu/uuid.h b/include/qemu/uuid.h
new file mode 100644
index 0000000..854a208
--- /dev/null
+++ b/include/qemu/uuid.h
@@ -0,0 +1,40 @@
+/*
+ *  QEMU UUID functions
+ *
+ *  Copyright 2016 Red Hat, Inc.,
+ *
+ *  Authors:
+ *   Fam Zheng <famz@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#ifndef QEMU_UUID_H
+#define QEMU_UUID_H
+
+#include "qemu-common.h"
+
+typedef unsigned char QemuUUID[16];
+
+#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-" \
+                 "%02hhx%02hhx-%02hhx%02hhx-" \
+                 "%02hhx%02hhx-" \
+                 "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
+
+#define UUID_FMT_LEN 36
+
+#define UUID_NONE "00000000-0000-0000-0000-000000000000"
+
+void qemu_uuid_generate(QemuUUID out);
+
+int qemu_uuid_is_null(const QemuUUID uu);
+
+void qemu_uuid_unparse(const QemuUUID uu, char *out);
+
+int qemu_uuid_parse(const char *str, uint8_t *uuid);
+
+#endif
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index ee7c760..6111950 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -18,10 +18,6 @@ extern const char *bios_name;
 extern const char *qemu_name;
 extern uint8_t qemu_uuid[];
 extern bool qemu_uuid_set;
-int qemu_uuid_parse(const char *str, uint8_t *uuid);
-
-#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
-#define UUID_NONE "00000000-0000-0000-0000-000000000000"
 
 bool runstate_check(RunState state);
 void runstate_set(RunState new_state);
diff --git a/qmp.c b/qmp.c
index b6d531e..7fbde29 100644
--- a/qmp.c
+++ b/qmp.c
@@ -35,6 +35,7 @@
 #include "qom/object_interfaces.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/acpi/acpi_dev_interface.h"
+#include "qemu/uuid.h"
 
 NameInfo *qmp_query_name(Error **errp)
 {
diff --git a/stubs/uuid.c b/stubs/uuid.c
index 92ad717..a880de8 100644
--- a/stubs/uuid.c
+++ b/stubs/uuid.c
@@ -1,6 +1,6 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
-#include "sysemu/sysemu.h"
+#include "qemu/uuid.h"
 #include "qmp-commands.h"
 
 UuidInfo *qmp_query_uuid(Error **errp)
diff --git a/util/Makefile.objs b/util/Makefile.objs
index 96cb1e0..31bba15 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -20,6 +20,7 @@ util-obj-y += iov.o qemu-config.o qemu-sockets.o uri.o notify.o
 util-obj-y += qemu-option.o qemu-progress.o
 util-obj-y += hexdump.o
 util-obj-y += crc32c.o
+util-obj-y += uuid.o
 util-obj-y += throttle.o
 util-obj-y += getauxval.o
 util-obj-y += readline.o
diff --git a/util/uuid.c b/util/uuid.c
new file mode 100644
index 0000000..9e26560
--- /dev/null
+++ b/util/uuid.c
@@ -0,0 +1,68 @@
+/*
+ *  QEMU UUID functions
+ *
+ *  Copyright 2016 Red Hat, Inc.,
+ *
+ *  Authors:
+ *   Fam Zheng <famz@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/uuid.h"
+#include <glib.h>
+
+void qemu_uuid_generate(QemuUUID out)
+{
+    /* Version 4 UUID, RFC4122 4.4. */
+    QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16);
+    *((guint32 *)out + 0) = g_random_int();
+    *((guint32 *)out + 1) = g_random_int();
+    *((guint32 *)out + 2) = g_random_int();
+    *((guint32 *)out + 3) = g_random_int();
+    /* Set the two most significant bits (bits 6 and 7) of the
+      clock_seq_hi_and_reserved to zero and one, respectively. */
+    out[8] = (out[8] & 0x3f) | 0x80;
+    /* Set the four most significant bits (bits 12 through 15) of the
+      time_hi_and_version field to the 4-bit version number.
+      */
+    out[6] = (out[6] & 0xf) | 0x40;
+}
+
+int qemu_uuid_is_null(const QemuUUID uu)
+{
+    QemuUUID null_uuid = { 0 };
+    return memcmp(uu, null_uuid, sizeof(QemuUUID)) == 0;
+}
+
+void qemu_uuid_unparse(const QemuUUID uu, char *out)
+{
+    snprintf(out, 37, UUID_FMT,
+             uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
+             uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
+}
+
+int qemu_uuid_parse(const char *str, uint8_t *uuid)
+{
+    int ret;
+
+    if (strlen(str) != 36) {
+        return -1;
+    }
+
+    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
+                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
+                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
+                 &uuid[15]);
+
+    if (ret != 16) {
+        return -1;
+    }
+    return 0;
+}
diff --git a/vl.c b/vl.c
index e7c2c62..8b12f34 100644
--- a/vl.c
+++ b/vl.c
@@ -25,6 +25,7 @@
 #include "qemu-version.h"
 #include "qemu/cutils.h"
 #include "qemu/help_option.h"
+#include "qemu/uuid.h"
 
 #ifdef CONFIG_SECCOMP
 #include "sysemu/seccomp.h"
-- 
2.7.4

[Qemu-devel] [PATCH v2 2/8] tests: Add uuid tests

[Fam Zheng]

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 tests/Makefile.include |   2 +
 tests/test-uuid.c      | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 tests/test-uuid.c

diff --git a/tests/Makefile.include b/tests/Makefile.include
index ebecfa4..d46f3a5 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -111,6 +111,7 @@ check-unit-y += tests/test-crypto-xts$(EXESUF)
 check-unit-y += tests/test-crypto-block$(EXESUF)
 gcov-files-test-logging-y = tests/test-logging.c
 check-unit-y += tests/test-logging$(EXESUF)
+check-unit-y += tests/test-uuid$(EXESUF)
 
 check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 
@@ -629,6 +630,7 @@ tests/test-filter-mirror$(EXESUF): tests/test-filter-mirror.o $(qtest-obj-y)
 tests/test-filter-redirector$(EXESUF): tests/test-filter-redirector.o $(qtest-obj-y)
 tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
 tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o
+tests/test-uuid$(EXESUF): tests/test-uuid.o $(test-util-obj-y)
 
 tests/migration/stress$(EXESUF): tests/migration/stress.o
 	$(call quiet-command, $(LINKPROG) -static -O3 $(PTHREAD_LIB) -o $@ $< ,"  LINK  $(TARGET_DIR)$@")
diff --git a/tests/test-uuid.c b/tests/test-uuid.c
new file mode 100644
index 0000000..05a40fd
--- /dev/null
+++ b/tests/test-uuid.c
@@ -0,0 +1,110 @@
+/*
+ * QEMU UUID Library
+ *
+ * Copyright (c) 2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/uuid.h"
+
+struct { const char *uuidstr; QemuUUID uuid; } uuid_test_data[] = {
+    {
+        "586ece27-7f09-41e0-9e74-e901317e9d42",
+        {0x58, 0x6e, 0xce, 0x27, 0x7f, 0x09, 0x41, 0xe0,
+         0x9e, 0x74, 0xe9, 0x01, 0x31, 0x7e, 0x9d, 0x42},
+    }, {
+        "0cc6c752-3961-4028-a286-c05cc616d396",
+        {0x0c, 0xc6, 0xc7, 0x52, 0x39, 0x61, 0x40, 0x28,
+         0xa2, 0x86, 0xc0, 0x5c, 0xc6, 0x16, 0xd3, 0x96}
+    }, {
+        "00000000-0000-0000-0000-000000000000",
+        { 0 },
+    }
+};
+
+static inline bool uuid_is_valid(QemuUUID uuid)
+{
+    return qemu_uuid_is_null(uuid) ||
+            ((uuid[6] & 0xf0) == 0x40 && (uuid[8] & 0xc0) == 0x80);
+}
+
+static void test_uuid_generate(void)
+{
+    QemuUUID uuid;
+    int i;
+
+    for (i = 0; i < 100; ++i) {
+        qemu_uuid_generate(uuid);
+        g_assert(uuid_is_valid(uuid));
+    }
+}
+
+static void test_uuid_parse(void)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(uuid_test_data); i++) {
+        QemuUUID uuid;
+
+        qemu_uuid_parse(uuid_test_data[i].uuidstr, uuid);
+        g_assert_cmpmem(uuid_test_data[i].uuid, sizeof(uuid),
+                        uuid, sizeof(uuid));
+        g_assert(uuid_is_valid(uuid));
+    }
+}
+
+static void test_uuid_unparse(void)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(uuid_test_data); i++) {
+        char out[strlen(UUID_FMT)];
+
+        qemu_uuid_unparse(uuid_test_data[i].uuid, out);
+        g_assert_cmpmem(uuid_test_data[i].uuidstr, UUID_FMT_LEN,
+                        out, UUID_FMT_LEN);
+    }
+}
+
+static void test_uuid_is_null(void)
+{
+    QemuUUID uuid_null = { 0 };
+    QemuUUID uuid_not_null = {
+        0x58, 0x6e, 0xce, 0x27, 0x7f, 0x09, 0x41, 0xe0,
+        0x9e, 0x74, 0xe9, 0x01, 0x31, 0x7e, 0x9d, 0x42
+    };
+    QemuUUID uuid_not_null_2 = { 1 };
+
+    g_assert(qemu_uuid_is_null(uuid_null));
+    g_assert_false(qemu_uuid_is_null(uuid_not_null));
+    g_assert_false(qemu_uuid_is_null(uuid_not_null_2));
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    g_test_add_func("/uuid/generate",
+                    test_uuid_generate);
+    g_test_add_func("/uuid/is_null",
+                    test_uuid_is_null);
+    g_test_add_func("/uuid/parse",
+                    test_uuid_parse);
+    g_test_add_func("/uuid/unparse",
+                    test_uuid_unparse);
+
+    return g_test_run();
+}
-- 
2.7.4

[Qemu-devel] [PATCH v2 3/8] vhdx: Use QEMU UUID API

[Fam Zheng]

This removes our dependency to libuuid, so that the driver can always be
built.

Similar to how we handled data plane configure options, --enable-vhdx
and --disable-vhdx are also changed to a nop with a message saying it's
obsolete.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/Makefile.objs |  2 +-
 block/vhdx-endian.c |  3 ---
 block/vhdx.c        |  7 +++----
 configure           | 27 +++------------------------
 4 files changed, 7 insertions(+), 32 deletions(-)

diff --git a/block/Makefile.objs b/block/Makefile.objs
index 2593a2f..013abb8 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -2,7 +2,7 @@ block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o
 block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
 block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
 block-obj-y += qed-check.o
-block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
+block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
 block-obj-y += quorum.o
 block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
 block-obj-y += block-backend.o snapshot.o qapi.o
diff --git a/block/vhdx-endian.c b/block/vhdx-endian.c
index c306b90..429d755 100644
--- a/block/vhdx-endian.c
+++ b/block/vhdx-endian.c
@@ -21,9 +21,6 @@
 #include "qemu/bswap.h"
 #include "block/vhdx.h"
 
-#include <uuid/uuid.h>
-
-
 /*
  * All the VHDX formats on disk are little endian - the following
  * are helper import/export functions to correctly convert
diff --git a/block/vhdx.c b/block/vhdx.c
index 75ef2b1..acd218c 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -25,8 +25,7 @@
 #include "qemu/bswap.h"
 #include "block/vhdx.h"
 #include "migration/migration.h"
-
-#include <uuid/uuid.h>
+#include "qemu/uuid.h"
 
 /* Options for VHDX creation */
 
@@ -213,10 +212,10 @@ bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset)
  */
 void vhdx_guid_generate(MSGUID *guid)
 {
-    uuid_t uuid;
+    QemuUUID uuid;
     assert(guid != NULL);
 
-    uuid_generate(uuid);
+    qemu_uuid_generate(uuid);
     memcpy(guid, uuid, sizeof(MSGUID));
 }
 
diff --git a/configure b/configure
index f57fcc6..cbb96d5 100755
--- a/configure
+++ b/configure
@@ -316,7 +316,6 @@ vte=""
 virglrenderer=""
 tpm="yes"
 libssh2=""
-vhdx=""
 numa=""
 tcmalloc="no"
 jemalloc="no"
@@ -1094,6 +1093,9 @@ for opt do
   --disable-virtio-blk-data-plane|--enable-virtio-blk-data-plane)
       echo "$0: $opt is obsolete, virtio-blk data-plane is always on" >&2
   ;;
+  --enable-vhdx|--disable-vhdx)
+      echo "$0: $opt is obsolete, VHDX driver is always built"
+  ;;
   --disable-gtk) gtk="no"
   ;;
   --enable-gtk) gtk="yes"
@@ -1134,10 +1136,6 @@ for opt do
   ;;
   --enable-libssh2) libssh2="yes"
   ;;
-  --enable-vhdx) vhdx="yes"
-  ;;
-  --disable-vhdx) vhdx="no"
-  ;;
   --disable-numa) numa="no"
   ;;
   --enable-numa) numa="yes"
@@ -1376,7 +1374,6 @@ disabled with --disable-FEATURE, default is enabled if available:
   archipelago     Archipelago backend
   tpm             TPM support
   libssh2         ssh block device support
-  vhdx            support for the Microsoft VHDX image format
   numa            libnuma support
   tcmalloc        tcmalloc support
   jemalloc        jemalloc support
@@ -2685,19 +2682,6 @@ EOF
   fi
 fi
 
-if test "$vhdx" = "yes" ; then
-    if test "$uuid" = "no" ; then
-        error_exit "uuid required for VHDX support"
-    fi
-elif test "$vhdx" != "no" ; then
-    if test "$uuid" = "yes" ; then
-        vhdx=yes
-    else
-        vhdx=no
-    fi
-fi
-
-##########################################
 # xfsctl() probe, used for raw-posix
 if test "$xfs" != "no" ; then
   cat > $TMPC << EOF
@@ -4891,7 +4875,6 @@ echo "TPM support       $tpm"
 echo "libssh2 support   $libssh2"
 echo "TPM passthrough   $tpm_passthrough"
 echo "QOM debugging     $qom_cast_debug"
-echo "vhdx              $vhdx"
 echo "lzo support       $lzo"
 echo "snappy support    $snappy"
 echo "bzip2 support     $bzip2"
@@ -5412,10 +5395,6 @@ if test "$libssh2" = "yes" ; then
   echo "LIBSSH2_LIBS=$libssh2_libs" >> $config_host_mak
 fi
 
-if test "$vhdx" = "yes" ; then
-  echo "CONFIG_VHDX=y" >> $config_host_mak
-fi
-
 # USB host support
 if test "$libusb" = "yes"; then
   echo "HOST_USB=libusb legacy" >> $config_host_mak
-- 
2.7.4

[Qemu-devel] [PATCH v2 4/8] vdi: Use QEMU UUID API

[Fam Zheng]

The QEMU UUID api, including the data structure (QemuUUID), is fully
compatible with libuuid.  Use it, and remove the unused code.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Weil <sw@weilnetz.de>
---
 block/vdi.c | 49 ++++++++++---------------------------------------
 1 file changed, 10 insertions(+), 39 deletions(-)

diff --git a/block/vdi.c b/block/vdi.c
index 8a1cf97..79a2428 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -58,14 +58,7 @@
 #include "migration/migration.h"
 #include "qemu/coroutine.h"
 #include "qemu/cutils.h"
-
-#if defined(CONFIG_UUID)
-#include <uuid/uuid.h>
-#else
-/* TODO: move uuid emulation to some central place in QEMU. */
-#include "sysemu/sysemu.h"     /* UUID_FMT */
-typedef unsigned char uuid_t[16];
-#endif
+#include "qemu/uuid.h"
 
 /* Code configuration options. */
 
@@ -140,28 +133,6 @@ typedef unsigned char uuid_t[16];
 #define VDI_DISK_SIZE_MAX        ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \
                                   (uint64_t)DEFAULT_CLUSTER_SIZE)
 
-#if !defined(CONFIG_UUID)
-static inline void uuid_generate(uuid_t out)
-{
-    memset(out, 0, sizeof(uuid_t));
-}
-
-static inline int uuid_is_null(const uuid_t uu)
-{
-    uuid_t null_uuid = { 0 };
-    return memcmp(uu, null_uuid, sizeof(uuid_t)) == 0;
-}
-
-# if defined(CONFIG_VDI_DEBUG)
-static inline void uuid_unparse(const uuid_t uu, char *out)
-{
-    snprintf(out, 37, UUID_FMT,
-            uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
-            uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
-}
-# endif
-#endif
-
 typedef struct {
     char text[0x40];
     uint32_t signature;
@@ -182,10 +153,10 @@ typedef struct {
     uint32_t block_extra;       /* unused here */
     uint32_t blocks_in_image;
     uint32_t blocks_allocated;
-    uuid_t uuid_image;
-    uuid_t uuid_last_snap;
-    uuid_t uuid_link;
-    uuid_t uuid_parent;
+    QemuUUID uuid_image;
+    QemuUUID uuid_last_snap;
+    QemuUUID uuid_link;
+    QemuUUID uuid_parent;
     uint64_t unused2[7];
 } QEMU_PACKED VdiHeader;
 
@@ -209,7 +180,7 @@ typedef struct {
 /* Change UUID from little endian (IPRT = VirtualBox format) to big endian
  * format (network byte order, standard, see RFC 4122) and vice versa.
  */
-static void uuid_convert(uuid_t uuid)
+static void uuid_convert(QemuUUID uuid)
 {
     bswap32s((uint32_t *)&uuid[0]);
     bswap16s((uint16_t *)&uuid[4]);
@@ -469,11 +440,11 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
                    (uint64_t)header.blocks_in_image * header.block_size);
         ret = -ENOTSUP;
         goto fail;
-    } else if (!uuid_is_null(header.uuid_link)) {
+    } else if (!qemu_uuid_is_null(header.uuid_link)) {
         error_setg(errp, "unsupported VDI image (non-NULL link UUID)");
         ret = -ENOTSUP;
         goto fail;
-    } else if (!uuid_is_null(header.uuid_parent)) {
+    } else if (!qemu_uuid_is_null(header.uuid_parent)) {
         error_setg(errp, "unsupported VDI image (non-NULL parent UUID)");
         ret = -ENOTSUP;
         goto fail;
@@ -821,8 +792,8 @@ static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
     if (image_type == VDI_TYPE_STATIC) {
         header.blocks_allocated = blocks;
     }
-    uuid_generate(header.uuid_image);
-    uuid_generate(header.uuid_last_snap);
+    qemu_uuid_generate(header.uuid_image);
+    qemu_uuid_generate(header.uuid_last_snap);
     /* There is no need to set header.uuid_link or header.uuid_parent here. */
 #if defined(CONFIG_VDI_DEBUG)
     vdi_header_print(&header);
-- 
2.7.4

[Qemu-devel] [PATCH v2 5/8] vpc: Use QEMU UUID API

[Fam Zheng]

Previously we conditionally generate if footer->uuid, when libuuid is
available. Now that we have a built-in implementation, we can switch to
it.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/vpc.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/block/vpc.c b/block/vpc.c
index 43707ed..4a60438 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -30,9 +30,7 @@
 #include "qemu/module.h"
 #include "migration/migration.h"
 #include "qemu/bswap.h"
-#if defined(CONFIG_UUID)
-#include <uuid/uuid.h>
-#endif
+#include "qemu/uuid.h"
 
 /**************************************************************/
 
@@ -980,9 +978,7 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp)
 
     footer->type = cpu_to_be32(disk_type);
 
-#if defined(CONFIG_UUID)
-    uuid_generate(footer->uuid);
-#endif
+    qemu_uuid_generate(footer->uuid);
 
     footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));
 
-- 
2.7.4

[Qemu-devel] [PATCH v2 6/8] crypto: Switch to QEMU UUID API

[Fam Zheng]

The uuid generation doesn't return error, so update the function
signature and calling code accordingly.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 crypto/block-luks.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index aba4455..cca66aa 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -29,10 +29,7 @@
 #include "crypto/pbkdf.h"
 #include "crypto/secret.h"
 #include "crypto/random.h"
-
-#ifdef CONFIG_UUID
-#include <uuid/uuid.h>
-#endif
+#include "qemu/uuid.h"
 
 #include "qemu/coroutine.h"
 
@@ -877,18 +874,12 @@ qcrypto_block_luks_open(QCryptoBlock *block,
 }
 
 
-static int
-qcrypto_block_luks_uuid_gen(uint8_t *uuidstr, Error **errp)
+static void
+qcrypto_block_luks_uuid_gen(uint8_t *uuidstr)
 {
-#ifdef CONFIG_UUID
-    uuid_t uuid;
-    uuid_generate(uuid);
-    uuid_unparse(uuid, (char *)uuidstr);
-    return 0;
-#else
-    error_setg(errp, "Unable to generate uuids on this platform");
-    return -1;
-#endif
+    QemuUUID uuid;
+    qemu_uuid_generate(uuid);
+    qemu_uuid_unparse(uuid, (char *)uuidstr);
 }
 
 static int
@@ -961,10 +952,7 @@ qcrypto_block_luks_create(QCryptoBlock *block,
      * it out to disk
      */
     luks->header.version = QCRYPTO_BLOCK_LUKS_VERSION;
-    if (qcrypto_block_luks_uuid_gen(luks->header.uuid,
-                                    errp) < 0) {
-        goto error;
-    }
+    qcrypto_block_luks_uuid_gen(luks->header.uuid);
 
     cipher_alg = qcrypto_block_luks_cipher_alg_lookup(luks_opts.cipher_alg,
                                                       errp);
-- 
2.7.4

[Qemu-devel] [PATCH v2 7/8] tests: No longer dependent on CONFIG_UUID

[Fam Zheng]

crypto now uses built-in uuid implementation, so this check is not
needed.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 tests/test-crypto-block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/test-crypto-block.c b/tests/test-crypto-block.c
index a38110d..1957a86 100644
--- a/tests/test-crypto-block.c
+++ b/tests/test-crypto-block.c
@@ -28,7 +28,7 @@
 #include <sys/resource.h>
 #endif
 
-#if defined(CONFIG_UUID) && (defined(_WIN32) || defined RUSAGE_THREAD)
+#if (defined(_WIN32) || defined RUSAGE_THREAD)
 #define TEST_LUKS
 #else
 #undef TEST_LUKS
-- 
2.7.4

[Qemu-devel] [PATCH v2 8/8] configure: Remove detection code for UUID

[Fam Zheng]

All code now uses built-in UUID implementation. Remove the code of
libuuid and make --enable-uuid and --disable-uuid only print a message.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 configure | 43 ++++---------------------------------------
 1 file changed, 4 insertions(+), 39 deletions(-)

diff --git a/configure b/configure
index cbb96d5..d6d71f3 100755
--- a/configure
+++ b/configure
@@ -212,7 +212,6 @@ sdlabi=""
 virtfs=""
 vnc="yes"
 sparse="no"
-uuid=""
 vde=""
 vnc_sasl=""
 vnc_jpeg=""
@@ -881,10 +880,6 @@ for opt do
   ;;
   --disable-slirp) slirp="no"
   ;;
-  --disable-uuid) uuid="no"
-  ;;
-  --enable-uuid) uuid="yes"
-  ;;
   --disable-vde) vde="no"
   ;;
   --enable-vde) vde="yes"
@@ -1096,6 +1091,9 @@ for opt do
   --enable-vhdx|--disable-vhdx)
       echo "$0: $opt is obsolete, VHDX driver is always built"
   ;;
+  --enable-uuid|--disable-uuid)
+      echo "$0: $opt is obsolete, UUID support is always built"
+  ;;
   --disable-gtk) gtk="no"
   ;;
   --enable-gtk) gtk="yes"
@@ -1350,7 +1348,6 @@ disabled with --disable-FEATURE, default is enabled if available:
   bluez           bluez stack connectivity
   kvm             KVM acceleration support
   rdma            RDMA-based migration support
-  uuid            uuid support
   vde             support for vde network
   netmap          support for netmap network
   linux-aio       Linux AIO support
@@ -2654,34 +2651,6 @@ if compile_prog "" "" ; then
 fi
 
 ##########################################
-# uuid_generate() probe, used for vdi block driver
-# Note that on some systems (notably MacOSX) no extra library
-# need be linked to get the uuid functions.
-if test "$uuid" != "no" ; then
-  uuid_libs="-luuid"
-  cat > $TMPC << EOF
-#include <uuid/uuid.h>
-int main(void)
-{
-    uuid_t my_uuid;
-    uuid_generate(my_uuid);
-    return 0;
-}
-EOF
-  if compile_prog "" "" ; then
-    uuid="yes"
-  elif compile_prog "" "$uuid_libs" ; then
-    uuid="yes"
-    libs_softmmu="$uuid_libs $libs_softmmu"
-    libs_tools="$uuid_libs $libs_tools"
-  else
-    if test "$uuid" = "yes" ; then
-      feature_not_found "uuid" "Install libuuid devel"
-    fi
-    uuid=no
-  fi
-fi
-
 # xfsctl() probe, used for raw-posix
 if test "$xfs" != "no" ; then
   cat > $TMPC << EOF
@@ -4054,7 +4023,7 @@ EOF
   if compile_prog "$vss_win32_include" "" ; then
     guest_agent_with_vss="yes"
     QEMU_CFLAGS="$QEMU_CFLAGS $vss_win32_include"
-    libs_qga="-lole32 -loleaut32 -lshlwapi -luuid -lstdc++ -Wl,--enable-stdcall-fixup $libs_qga"
+    libs_qga="-lole32 -loleaut32 -lshlwapi -lstdc++ -Wl,--enable-stdcall-fixup $libs_qga"
     qga_vss_provider="qga/vss-win32/qga-vss.dll qga/vss-win32/qga-vss.tlb"
   else
     if test "$vss_win32_sdk" != "" ; then
@@ -4842,7 +4811,6 @@ echo "preadv support    $preadv"
 echo "fdatasync         $fdatasync"
 echo "madvise           $madvise"
 echo "posix_madvise     $posix_madvise"
-echo "uuid support      $uuid"
 echo "libcap-ng support $cap_ng"
 echo "vhost-net support $vhost_net"
 echo "vhost-scsi support $vhost_scsi"
@@ -5030,9 +4998,6 @@ fi
 if test "$fnmatch" = "yes" ; then
   echo "CONFIG_FNMATCH=y" >> $config_host_mak
 fi
-if test "$uuid" = "yes" ; then
-  echo "CONFIG_UUID=y" >> $config_host_mak
-fi
 if test "$xfs" = "yes" ; then
   echo "CONFIG_XFS=y" >> $config_host_mak
 fi
-- 
2.7.4

Re: [Qemu-devel] [PATCH v2 2/8] tests: Add uuid tests

[Daniel P. Berrange]

On Mon, Aug 08, 2016 at 02:09:22PM +0800, Fam Zheng wrote:
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  tests/Makefile.include |   2 +
>  tests/test-uuid.c      | 110 +++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 112 insertions(+)
>  create mode 100644 tests/test-uuid.c
> 
> diff --git a/tests/Makefile.include b/tests/Makefile.include
> index ebecfa4..d46f3a5 100644
> --- a/tests/Makefile.include
> +++ b/tests/Makefile.include
> @@ -111,6 +111,7 @@ check-unit-y += tests/test-crypto-xts$(EXESUF)
>  check-unit-y += tests/test-crypto-block$(EXESUF)
>  gcov-files-test-logging-y = tests/test-logging.c
>  check-unit-y += tests/test-logging$(EXESUF)
> +check-unit-y += tests/test-uuid$(EXESUF)
>  
>  check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
>  
> @@ -629,6 +630,7 @@ tests/test-filter-mirror$(EXESUF): tests/test-filter-mirror.o $(qtest-obj-y)
>  tests/test-filter-redirector$(EXESUF): tests/test-filter-redirector.o $(qtest-obj-y)
>  tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y)
>  tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o
> +tests/test-uuid$(EXESUF): tests/test-uuid.o $(test-util-obj-y)
>  
>  tests/migration/stress$(EXESUF): tests/migration/stress.o
>  	$(call quiet-command, $(LINKPROG) -static -O3 $(PTHREAD_LIB) -o $@ $< ,"  LINK  $(TARGET_DIR)$@")
> diff --git a/tests/test-uuid.c b/tests/test-uuid.c
> new file mode 100644
> index 0000000..05a40fd
> --- /dev/null
> +++ b/tests/test-uuid.c
> @@ -0,0 +1,110 @@
> +/*
> + * QEMU UUID Library
> + *
> + * Copyright (c) 2016 Red Hat, Inc.
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + *
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/uuid.h"
> +
> +struct { const char *uuidstr; QemuUUID uuid; } uuid_test_data[] = {
> +    {
> +        "586ece27-7f09-41e0-9e74-e901317e9d42",
> +        {0x58, 0x6e, 0xce, 0x27, 0x7f, 0x09, 0x41, 0xe0,
> +         0x9e, 0x74, 0xe9, 0x01, 0x31, 0x7e, 0x9d, 0x42},
> +    }, {
> +        "0cc6c752-3961-4028-a286-c05cc616d396",

Use uppercase A-F in this one, so we're got a pair of uuids which
cover both cases

> +        {0x0c, 0xc6, 0xc7, 0x52, 0x39, 0x61, 0x40, 0x28,
> +         0xa2, 0x86, 0xc0, 0x5c, 0xc6, 0x16, 0xd3, 0x96}
> +    }, {
> +        "00000000-0000-0000-0000-000000000000",
> +        { 0 },
> +    }

We should do some negative tests. eg a uuid without '-' separators;
a UUID which is too short; a UUID which is too long; a UUID which
has non-hex characters, a zero length UUID.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

Re: [Qemu-devel] [PATCH v2 6/8] crypto: Switch to QEMU UUID API

[Daniel P. Berrange]

On Mon, Aug 08, 2016 at 02:09:26PM +0800, Fam Zheng wrote:
> The uuid generation doesn't return error, so update the function
> signature and calling code accordingly.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  crypto/block-luks.c | 26 +++++++-------------------
>  1 file changed, 7 insertions(+), 19 deletions(-)

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>.

FWIW, I'm happy for this patch to be merged as part of this
series - no need for it to go in via my crypto/ patches queue

> diff --git a/crypto/block-luks.c b/crypto/block-luks.c
> index aba4455..cca66aa 100644
> --- a/crypto/block-luks.c
> +++ b/crypto/block-luks.c
> @@ -29,10 +29,7 @@
>  #include "crypto/pbkdf.h"
>  #include "crypto/secret.h"
>  #include "crypto/random.h"
> -
> -#ifdef CONFIG_UUID
> -#include <uuid/uuid.h>
> -#endif
> +#include "qemu/uuid.h"
>  
>  #include "qemu/coroutine.h"
>  
> @@ -877,18 +874,12 @@ qcrypto_block_luks_open(QCryptoBlock *block,
>  }
>  
>  
> -static int
> -qcrypto_block_luks_uuid_gen(uint8_t *uuidstr, Error **errp)
> +static void
> +qcrypto_block_luks_uuid_gen(uint8_t *uuidstr)
>  {
> -#ifdef CONFIG_UUID
> -    uuid_t uuid;
> -    uuid_generate(uuid);
> -    uuid_unparse(uuid, (char *)uuidstr);
> -    return 0;
> -#else
> -    error_setg(errp, "Unable to generate uuids on this platform");
> -    return -1;
> -#endif
> +    QemuUUID uuid;
> +    qemu_uuid_generate(uuid);
> +    qemu_uuid_unparse(uuid, (char *)uuidstr);
>  }
>  
>  static int
> @@ -961,10 +952,7 @@ qcrypto_block_luks_create(QCryptoBlock *block,
>       * it out to disk
>       */
>      luks->header.version = QCRYPTO_BLOCK_LUKS_VERSION;
> -    if (qcrypto_block_luks_uuid_gen(luks->header.uuid,
> -                                    errp) < 0) {
> -        goto error;
> -    }
> +    qcrypto_block_luks_uuid_gen(luks->header.uuid);
>  
>      cipher_alg = qcrypto_block_luks_cipher_alg_lookup(luks_opts.cipher_alg,
>                                                        errp);
> -- 
> 2.7.4
> 

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|

Re: [Qemu-devel] [PATCH v2 1/8] util: Add UUID API

[Markus Armbruster]

Fam Zheng <famz@redhat.com> writes:

> A number of different places across the code base use CONFIG_UUID. Some
> of them are soft dependency, some are not built if libuuid is not
> available, some come with dummy fallback, some throws runtime error.
>
> It is hard to maintain, and hard to reason for users.
>
> Since UUID is a simple standard with only a small number of operations,
> it is cleaner to have a central support in libqemuutil. This patch adds
> qemu_uuid_* the functions so that all uuid users in the code base can
> rely on. Except for qemu_uuid_generate which is new code, all other
> functions are just copy from existing fallbacks from other files.
>
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  arch_init.c             | 19 --------------
>  block/iscsi.c           |  2 +-
>  hw/smbios/smbios.c      |  1 +
>  include/qemu/uuid.h     | 40 +++++++++++++++++++++++++++++
>  include/sysemu/sysemu.h |  4 ---
>  qmp.c                   |  1 +
>  stubs/uuid.c            |  2 +-
>  util/Makefile.objs      |  1 +
>  util/uuid.c             | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
>  vl.c                    |  1 +
>  10 files changed, 114 insertions(+), 25 deletions(-)
>  create mode 100644 include/qemu/uuid.h
>  create mode 100644 util/uuid.c
>
> diff --git a/arch_init.c b/arch_init.c
> index fa05973..5cc58b2 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -235,25 +235,6 @@ void audio_init(void)
>      }
>  }
>  
> -int qemu_uuid_parse(const char *str, uint8_t *uuid)
> -{
> -    int ret;
> -
> -    if (strlen(str) != 36) {
> -        return -1;
> -    }
> -
> -    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
> -                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
> -                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
> -                 &uuid[15]);
> -
> -    if (ret != 16) {
> -        return -1;
> -    }
> -    return 0;
> -}
> -
>  void do_acpitable_option(const QemuOpts *opts)
>  {
>  #ifdef TARGET_I386
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 95ce9e1..961ac76 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -36,7 +36,7 @@
>  #include "block/block_int.h"
>  #include "block/scsi.h"
>  #include "qemu/iov.h"
> -#include "sysemu/sysemu.h"
> +#include "qemu/uuid.h"
>  #include "qmp-commands.h"
>  #include "qapi/qmp/qstring.h"
>  #include "crypto/secret.h"
> diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
> index 74c7102..0705eb1 100644
> --- a/hw/smbios/smbios.c
> +++ b/hw/smbios/smbios.c
> @@ -20,6 +20,7 @@
>  #include "qemu/config-file.h"
>  #include "qemu/error-report.h"
>  #include "sysemu/sysemu.h"
> +#include "qemu/uuid.h"
>  #include "sysemu/cpus.h"
>  #include "hw/smbios/smbios.h"
>  #include "hw/loader.h"
> diff --git a/include/qemu/uuid.h b/include/qemu/uuid.h
> new file mode 100644
> index 0000000..854a208
> --- /dev/null
> +++ b/include/qemu/uuid.h
> @@ -0,0 +1,40 @@
> +/*
> + *  QEMU UUID functions
> + *
> + *  Copyright 2016 Red Hat, Inc.,
> + *
> + *  Authors:
> + *   Fam Zheng <famz@redhat.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the Free
> + * Software Foundation; either version 2 of the License, or (at your option)
> + * any later version.
> + *
> + */
> +
> +#ifndef QEMU_UUID_H
> +#define QEMU_UUID_H
> +
> +#include "qemu-common.h"
> +
> +typedef unsigned char QemuUUID[16];

I'm afraid this typedef is problematic.  Consider:

    void use_uuid(QemuUUID uuid)
    {
        printf("sizeof(uuid) %zd\n", sizeof(uuid));
        uuid[0]++;
    }

QemuUUID is obviously a typedef name, so a reasonable reader may assume
(1) sizeof(uuid) is the size of the uuid, and (2) since uuid is passed
by value, the increment is not visible outside the function.  Both
assumptions are wrong, because array arguments degenerate into pointers.

I recommend to wrap it in a struct.

> +
> +#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-" \
> +                 "%02hhx%02hhx-%02hhx%02hhx-" \
> +                 "%02hhx%02hhx-" \
> +                 "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
> +
> +#define UUID_FMT_LEN 36
> +
> +#define UUID_NONE "00000000-0000-0000-0000-000000000000"
> +
> +void qemu_uuid_generate(QemuUUID out);
> +
> +int qemu_uuid_is_null(const QemuUUID uu);
> +
> +void qemu_uuid_unparse(const QemuUUID uu, char *out);
> +
> +int qemu_uuid_parse(const char *str, uint8_t *uuid);
> +
> +#endif
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index ee7c760..6111950 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -18,10 +18,6 @@ extern const char *bios_name;
>  extern const char *qemu_name;
>  extern uint8_t qemu_uuid[];
>  extern bool qemu_uuid_set;
> -int qemu_uuid_parse(const char *str, uint8_t *uuid);
> -
> -#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
> -#define UUID_NONE "00000000-0000-0000-0000-000000000000"
>  
>  bool runstate_check(RunState state);
>  void runstate_set(RunState new_state);
> diff --git a/qmp.c b/qmp.c
> index b6d531e..7fbde29 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -35,6 +35,7 @@
>  #include "qom/object_interfaces.h"
>  #include "hw/mem/pc-dimm.h"
>  #include "hw/acpi/acpi_dev_interface.h"
> +#include "qemu/uuid.h"
>  
>  NameInfo *qmp_query_name(Error **errp)
>  {
> diff --git a/stubs/uuid.c b/stubs/uuid.c
> index 92ad717..a880de8 100644
> --- a/stubs/uuid.c
> +++ b/stubs/uuid.c
> @@ -1,6 +1,6 @@
>  #include "qemu/osdep.h"
>  #include "qemu-common.h"
> -#include "sysemu/sysemu.h"
> +#include "qemu/uuid.h"
>  #include "qmp-commands.h"
>  
>  UuidInfo *qmp_query_uuid(Error **errp)
> diff --git a/util/Makefile.objs b/util/Makefile.objs
> index 96cb1e0..31bba15 100644
> --- a/util/Makefile.objs
> +++ b/util/Makefile.objs
> @@ -20,6 +20,7 @@ util-obj-y += iov.o qemu-config.o qemu-sockets.o uri.o notify.o
>  util-obj-y += qemu-option.o qemu-progress.o
>  util-obj-y += hexdump.o
>  util-obj-y += crc32c.o
> +util-obj-y += uuid.o
>  util-obj-y += throttle.o
>  util-obj-y += getauxval.o
>  util-obj-y += readline.o
> diff --git a/util/uuid.c b/util/uuid.c
> new file mode 100644
> index 0000000..9e26560
> --- /dev/null
> +++ b/util/uuid.c
> @@ -0,0 +1,68 @@
> +/*
> + *  QEMU UUID functions
> + *
> + *  Copyright 2016 Red Hat, Inc.,
> + *
> + *  Authors:
> + *   Fam Zheng <famz@redhat.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the Free
> + * Software Foundation; either version 2 of the License, or (at your option)
> + * any later version.
> + *
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu-common.h"
> +#include "qemu/uuid.h"
> +#include <glib.h>
> +
> +void qemu_uuid_generate(QemuUUID out)
> +{
> +    /* Version 4 UUID, RFC4122 4.4. */
> +    QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16);
> +    *((guint32 *)out + 0) = g_random_int();
> +    *((guint32 *)out + 1) = g_random_int();
> +    *((guint32 *)out + 2) = g_random_int();
> +    *((guint32 *)out + 3) = g_random_int();

I loathe GLib's pointless duplication of the standard integer types.
Sure we can't simply use uint32_t?

Possibly:

    uint32_t *out32 = (uint32_t)out;
    out32[0] = g_random_int();
    out32[1] = g_random_int();
    out32[2] = g_random_int();
    out32[3] = g_random_int();

> +    /* Set the two most significant bits (bits 6 and 7) of the
> +      clock_seq_hi_and_reserved to zero and one, respectively. */
> +    out[8] = (out[8] & 0x3f) | 0x80;
> +    /* Set the four most significant bits (bits 12 through 15) of the
> +      time_hi_and_version field to the 4-bit version number.
> +      */
> +    out[6] = (out[6] & 0xf) | 0x40;
> +}
> +
> +int qemu_uuid_is_null(const QemuUUID uu)
> +{
> +    QemuUUID null_uuid = { 0 };
> +    return memcmp(uu, null_uuid, sizeof(QemuUUID)) == 0;
> +}
> +
> +void qemu_uuid_unparse(const QemuUUID uu, char *out)

While there, you could write a function contract that spells out that
@out[] must have space for 37 characters.

> +{
> +    snprintf(out, 37, UUID_FMT,
> +             uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
> +             uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
> +}
> +
> +int qemu_uuid_parse(const char *str, uint8_t *uuid)
> +{
> +    int ret;
> +
> +    if (strlen(str) != 36) {
> +        return -1;
> +    }
> +
> +    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
> +                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
> +                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
> +                 &uuid[15]);
> +
> +    if (ret != 16) {
> +        return -1;
> +    }
> +    return 0;
> +}
> diff --git a/vl.c b/vl.c
> index e7c2c62..8b12f34 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -25,6 +25,7 @@
>  #include "qemu-version.h"
>  #include "qemu/cutils.h"
>  #include "qemu/help_option.h"
> +#include "qemu/uuid.h"
>  
>  #ifdef CONFIG_SECCOMP
>  #include "sysemu/seccomp.h"

Re: [Qemu-devel] [PATCH v2 1/8] util: Add UUID API

[Jeff Cody]

On Mon, Aug 08, 2016 at 01:07:33PM +0200, Markus Armbruster wrote:
> Fam Zheng <famz@redhat.com> writes:
> 
> > A number of different places across the code base use CONFIG_UUID. Some
> > of them are soft dependency, some are not built if libuuid is not
> > available, some come with dummy fallback, some throws runtime error.
> >
> > It is hard to maintain, and hard to reason for users.
> >
> > Since UUID is a simple standard with only a small number of operations,
> > it is cleaner to have a central support in libqemuutil. This patch adds
> > qemu_uuid_* the functions so that all uuid users in the code base can
> > rely on. Except for qemu_uuid_generate which is new code, all other
> > functions are just copy from existing fallbacks from other files.
> >
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  arch_init.c             | 19 --------------
> >  block/iscsi.c           |  2 +-
> >  hw/smbios/smbios.c      |  1 +
> >  include/qemu/uuid.h     | 40 +++++++++++++++++++++++++++++
> >  include/sysemu/sysemu.h |  4 ---
> >  qmp.c                   |  1 +
> >  stubs/uuid.c            |  2 +-
> >  util/Makefile.objs      |  1 +
> >  util/uuid.c             | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  vl.c                    |  1 +
> >  10 files changed, 114 insertions(+), 25 deletions(-)
> >  create mode 100644 include/qemu/uuid.h
> >  create mode 100644 util/uuid.c
> >
> > diff --git a/arch_init.c b/arch_init.c
> > index fa05973..5cc58b2 100644
> > --- a/arch_init.c
> > +++ b/arch_init.c
> > @@ -235,25 +235,6 @@ void audio_init(void)
> >      }
> >  }
> >  
> > -int qemu_uuid_parse(const char *str, uint8_t *uuid)
> > -{
> > -    int ret;
> > -
> > -    if (strlen(str) != 36) {
> > -        return -1;
> > -    }
> > -
> > -    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
> > -                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
> > -                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
> > -                 &uuid[15]);
> > -
> > -    if (ret != 16) {
> > -        return -1;
> > -    }
> > -    return 0;
> > -}
> > -
> >  void do_acpitable_option(const QemuOpts *opts)
> >  {
> >  #ifdef TARGET_I386
> > diff --git a/block/iscsi.c b/block/iscsi.c
> > index 95ce9e1..961ac76 100644
> > --- a/block/iscsi.c
> > +++ b/block/iscsi.c
> > @@ -36,7 +36,7 @@
> >  #include "block/block_int.h"
> >  #include "block/scsi.h"
> >  #include "qemu/iov.h"
> > -#include "sysemu/sysemu.h"
> > +#include "qemu/uuid.h"
> >  #include "qmp-commands.h"
> >  #include "qapi/qmp/qstring.h"
> >  #include "crypto/secret.h"
> > diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
> > index 74c7102..0705eb1 100644
> > --- a/hw/smbios/smbios.c
> > +++ b/hw/smbios/smbios.c
> > @@ -20,6 +20,7 @@
> >  #include "qemu/config-file.h"
> >  #include "qemu/error-report.h"
> >  #include "sysemu/sysemu.h"
> > +#include "qemu/uuid.h"
> >  #include "sysemu/cpus.h"
> >  #include "hw/smbios/smbios.h"
> >  #include "hw/loader.h"
> > diff --git a/include/qemu/uuid.h b/include/qemu/uuid.h
> > new file mode 100644
> > index 0000000..854a208
> > --- /dev/null
> > +++ b/include/qemu/uuid.h
> > @@ -0,0 +1,40 @@
> > +/*
> > + *  QEMU UUID functions
> > + *
> > + *  Copyright 2016 Red Hat, Inc.,
> > + *
> > + *  Authors:
> > + *   Fam Zheng <famz@redhat.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the Free
> > + * Software Foundation; either version 2 of the License, or (at your option)
> > + * any later version.
> > + *
> > + */
> > +
> > +#ifndef QEMU_UUID_H
> > +#define QEMU_UUID_H
> > +
> > +#include "qemu-common.h"
> > +
> > +typedef unsigned char QemuUUID[16];
> 
> I'm afraid this typedef is problematic.  Consider:
> 
>     void use_uuid(QemuUUID uuid)
>     {
>         printf("sizeof(uuid) %zd\n", sizeof(uuid));
>         uuid[0]++;
>     }
> 
> QemuUUID is obviously a typedef name, so a reasonable reader may assume
> (1) sizeof(uuid) is the size of the uuid, and (2) since uuid is passed
> by value, the increment is not visible outside the function.  Both
> assumptions are wrong, because array arguments degenerate into pointers.
> 
> I recommend to wrap it in a struct.
>

If we are going for a semantic drop-in replacement for libuuid's uuid_t,
Fam's typedef here is consistent with libuuid:

    typedef unsigned char uuid_t[16];

(Not to say that prohibits changing it, just pointing out there is value in
mimicking libuuid's interfaces).

> > +
> > +#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-" \
> > +                 "%02hhx%02hhx-%02hhx%02hhx-" \
> > +                 "%02hhx%02hhx-" \
> > +                 "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
> > +
> > +#define UUID_FMT_LEN 36
> > +
> > +#define UUID_NONE "00000000-0000-0000-0000-000000000000"
> > +
> > +void qemu_uuid_generate(QemuUUID out);
> > +
> > +int qemu_uuid_is_null(const QemuUUID uu);
> > +
> > +void qemu_uuid_unparse(const QemuUUID uu, char *out);
> > +
> > +int qemu_uuid_parse(const char *str, uint8_t *uuid);
> > +
> > +#endif
> > diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> > index ee7c760..6111950 100644
> > --- a/include/sysemu/sysemu.h
> > +++ b/include/sysemu/sysemu.h
> > @@ -18,10 +18,6 @@ extern const char *bios_name;
> >  extern const char *qemu_name;
> >  extern uint8_t qemu_uuid[];
> >  extern bool qemu_uuid_set;
> > -int qemu_uuid_parse(const char *str, uint8_t *uuid);
> > -
> > -#define UUID_FMT "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
> > -#define UUID_NONE "00000000-0000-0000-0000-000000000000"
> >  
> >  bool runstate_check(RunState state);
> >  void runstate_set(RunState new_state);
> > diff --git a/qmp.c b/qmp.c
> > index b6d531e..7fbde29 100644
> > --- a/qmp.c
> > +++ b/qmp.c
> > @@ -35,6 +35,7 @@
> >  #include "qom/object_interfaces.h"
> >  #include "hw/mem/pc-dimm.h"
> >  #include "hw/acpi/acpi_dev_interface.h"
> > +#include "qemu/uuid.h"
> >  
> >  NameInfo *qmp_query_name(Error **errp)
> >  {
> > diff --git a/stubs/uuid.c b/stubs/uuid.c
> > index 92ad717..a880de8 100644
> > --- a/stubs/uuid.c
> > +++ b/stubs/uuid.c
> > @@ -1,6 +1,6 @@
> >  #include "qemu/osdep.h"
> >  #include "qemu-common.h"
> > -#include "sysemu/sysemu.h"
> > +#include "qemu/uuid.h"
> >  #include "qmp-commands.h"
> >  
> >  UuidInfo *qmp_query_uuid(Error **errp)
> > diff --git a/util/Makefile.objs b/util/Makefile.objs
> > index 96cb1e0..31bba15 100644
> > --- a/util/Makefile.objs
> > +++ b/util/Makefile.objs
> > @@ -20,6 +20,7 @@ util-obj-y += iov.o qemu-config.o qemu-sockets.o uri.o notify.o
> >  util-obj-y += qemu-option.o qemu-progress.o
> >  util-obj-y += hexdump.o
> >  util-obj-y += crc32c.o
> > +util-obj-y += uuid.o
> >  util-obj-y += throttle.o
> >  util-obj-y += getauxval.o
> >  util-obj-y += readline.o
> > diff --git a/util/uuid.c b/util/uuid.c
> > new file mode 100644
> > index 0000000..9e26560
> > --- /dev/null
> > +++ b/util/uuid.c
> > @@ -0,0 +1,68 @@
> > +/*
> > + *  QEMU UUID functions
> > + *
> > + *  Copyright 2016 Red Hat, Inc.,
> > + *
> > + *  Authors:
> > + *   Fam Zheng <famz@redhat.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms of the GNU General Public License as published by the Free
> > + * Software Foundation; either version 2 of the License, or (at your option)
> > + * any later version.
> > + *
> > + */
> > +
> > +#include "qemu/osdep.h"
> > +#include "qemu-common.h"
> > +#include "qemu/uuid.h"
> > +#include <glib.h>
> > +
> > +void qemu_uuid_generate(QemuUUID out)
> > +{
> > +    /* Version 4 UUID, RFC4122 4.4. */
> > +    QEMU_BUILD_BUG_ON(sizeof(QemuUUID) != 16);
> > +    *((guint32 *)out + 0) = g_random_int();
> > +    *((guint32 *)out + 1) = g_random_int();
> > +    *((guint32 *)out + 2) = g_random_int();
> > +    *((guint32 *)out + 3) = g_random_int();
> 
> I loathe GLib's pointless duplication of the standard integer types.
> Sure we can't simply use uint32_t?
> 
> Possibly:
> 
>     uint32_t *out32 = (uint32_t)out;
>     out32[0] = g_random_int();
>     out32[1] = g_random_int();
>     out32[2] = g_random_int();
>     out32[3] = g_random_int();
> 
> > +    /* Set the two most significant bits (bits 6 and 7) of the
> > +      clock_seq_hi_and_reserved to zero and one, respectively. */
> > +    out[8] = (out[8] & 0x3f) | 0x80;
> > +    /* Set the four most significant bits (bits 12 through 15) of the
> > +      time_hi_and_version field to the 4-bit version number.
> > +      */
> > +    out[6] = (out[6] & 0xf) | 0x40;
> > +}
> > +
> > +int qemu_uuid_is_null(const QemuUUID uu)
> > +{
> > +    QemuUUID null_uuid = { 0 };
> > +    return memcmp(uu, null_uuid, sizeof(QemuUUID)) == 0;
> > +}
> > +
> > +void qemu_uuid_unparse(const QemuUUID uu, char *out)
> 
> While there, you could write a function contract that spells out that
> @out[] must have space for 37 characters.
> 
> > +{
> > +    snprintf(out, 37, UUID_FMT,
> > +             uu[0], uu[1], uu[2], uu[3], uu[4], uu[5], uu[6], uu[7],
> > +             uu[8], uu[9], uu[10], uu[11], uu[12], uu[13], uu[14], uu[15]);
> > +}
> > +
> > +int qemu_uuid_parse(const char *str, uint8_t *uuid)
> > +{
> > +    int ret;
> > +
> > +    if (strlen(str) != 36) {
> > +        return -1;
> > +    }
> > +
> > +    ret = sscanf(str, UUID_FMT, &uuid[0], &uuid[1], &uuid[2], &uuid[3],
> > +                 &uuid[4], &uuid[5], &uuid[6], &uuid[7], &uuid[8], &uuid[9],
> > +                 &uuid[10], &uuid[11], &uuid[12], &uuid[13], &uuid[14],
> > +                 &uuid[15]);
> > +
> > +    if (ret != 16) {
> > +        return -1;
> > +    }
> > +    return 0;
> > +}
> > diff --git a/vl.c b/vl.c
> > index e7c2c62..8b12f34 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -25,6 +25,7 @@
> >  #include "qemu-version.h"
> >  #include "qemu/cutils.h"
> >  #include "qemu/help_option.h"
> > +#include "qemu/uuid.h"
> >  
> >  #ifdef CONFIG_SECCOMP
> >  #include "sysemu/seccomp.h"
> 

Re: [Qemu-devel] [PATCH v2 3/8] vhdx: Use QEMU UUID API

[Jeff Cody]

On Mon, Aug 08, 2016 at 02:09:23PM +0800, Fam Zheng wrote:
> This removes our dependency to libuuid, so that the driver can always be
> built.
> 
> Similar to how we handled data plane configure options, --enable-vhdx
> and --disable-vhdx are also changed to a nop with a message saying it's
> obsolete.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>

It's nice to get rid of the extra dependency.

> ---
>  block/Makefile.objs |  2 +-
>  block/vhdx-endian.c |  3 ---
>  block/vhdx.c        |  7 +++----
>  configure           | 27 +++------------------------
>  4 files changed, 7 insertions(+), 32 deletions(-)
> 
> diff --git a/block/Makefile.objs b/block/Makefile.objs
> index 2593a2f..013abb8 100644
> --- a/block/Makefile.objs
> +++ b/block/Makefile.objs
> @@ -2,7 +2,7 @@ block-obj-y += raw_bsd.o qcow.o vdi.o vmdk.o cloop.o bochs.o vpc.o vvfat.o
>  block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
>  block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
>  block-obj-y += qed-check.o
> -block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o vhdx-log.o
> +block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
>  block-obj-y += quorum.o
>  block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
>  block-obj-y += block-backend.o snapshot.o qapi.o
> diff --git a/block/vhdx-endian.c b/block/vhdx-endian.c
> index c306b90..429d755 100644
> --- a/block/vhdx-endian.c
> +++ b/block/vhdx-endian.c
> @@ -21,9 +21,6 @@
>  #include "qemu/bswap.h"
>  #include "block/vhdx.h"
>  
> -#include <uuid/uuid.h>
> -
> -
>  /*
>   * All the VHDX formats on disk are little endian - the following
>   * are helper import/export functions to correctly convert
> diff --git a/block/vhdx.c b/block/vhdx.c
> index 75ef2b1..acd218c 100644
> --- a/block/vhdx.c
> +++ b/block/vhdx.c
> @@ -25,8 +25,7 @@
>  #include "qemu/bswap.h"
>  #include "block/vhdx.h"
>  #include "migration/migration.h"
> -
> -#include <uuid/uuid.h>
> +#include "qemu/uuid.h"
>  
>  /* Options for VHDX creation */
>  
> @@ -213,10 +212,10 @@ bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset)
>   */
>  void vhdx_guid_generate(MSGUID *guid)
>  {
> -    uuid_t uuid;
> +    QemuUUID uuid;
>      assert(guid != NULL);
>  
> -    uuid_generate(uuid);
> +    qemu_uuid_generate(uuid);
>      memcpy(guid, uuid, sizeof(MSGUID));
>  }
>  
> diff --git a/configure b/configure
> index f57fcc6..cbb96d5 100755
> --- a/configure
> +++ b/configure
> @@ -316,7 +316,6 @@ vte=""
>  virglrenderer=""
>  tpm="yes"
>  libssh2=""
> -vhdx=""
>  numa=""
>  tcmalloc="no"
>  jemalloc="no"
> @@ -1094,6 +1093,9 @@ for opt do
>    --disable-virtio-blk-data-plane|--enable-virtio-blk-data-plane)
>        echo "$0: $opt is obsolete, virtio-blk data-plane is always on" >&2
>    ;;
> +  --enable-vhdx|--disable-vhdx)
> +      echo "$0: $opt is obsolete, VHDX driver is always built"
> +  ;;

Data plan echoes this out to stderr, which is probably the best option.  We
should probably do the same for VHDX.

>    --disable-gtk) gtk="no"
>    ;;
>    --enable-gtk) gtk="yes"
> @@ -1134,10 +1136,6 @@ for opt do
>    ;;
>    --enable-libssh2) libssh2="yes"
>    ;;
> -  --enable-vhdx) vhdx="yes"
> -  ;;
> -  --disable-vhdx) vhdx="no"
> -  ;;
>    --disable-numa) numa="no"
>    ;;
>    --enable-numa) numa="yes"
> @@ -1376,7 +1374,6 @@ disabled with --disable-FEATURE, default is enabled if available:
>    archipelago     Archipelago backend
>    tpm             TPM support
>    libssh2         ssh block device support
> -  vhdx            support for the Microsoft VHDX image format
>    numa            libnuma support
>    tcmalloc        tcmalloc support
>    jemalloc        jemalloc support
> @@ -2685,19 +2682,6 @@ EOF
>    fi
>  fi
>  
> -if test "$vhdx" = "yes" ; then
> -    if test "$uuid" = "no" ; then
> -        error_exit "uuid required for VHDX support"
> -    fi
> -elif test "$vhdx" != "no" ; then
> -    if test "$uuid" = "yes" ; then
> -        vhdx=yes
> -    else
> -        vhdx=no
> -    fi
> -fi
> -
> -##########################################
>  # xfsctl() probe, used for raw-posix
>  if test "$xfs" != "no" ; then
>    cat > $TMPC << EOF
> @@ -4891,7 +4875,6 @@ echo "TPM support       $tpm"
>  echo "libssh2 support   $libssh2"
>  echo "TPM passthrough   $tpm_passthrough"
>  echo "QOM debugging     $qom_cast_debug"
> -echo "vhdx              $vhdx"
>  echo "lzo support       $lzo"
>  echo "snappy support    $snappy"
>  echo "bzip2 support     $bzip2"
> @@ -5412,10 +5395,6 @@ if test "$libssh2" = "yes" ; then
>    echo "LIBSSH2_LIBS=$libssh2_libs" >> $config_host_mak
>  fi
>  
> -if test "$vhdx" = "yes" ; then
> -  echo "CONFIG_VHDX=y" >> $config_host_mak
> -fi
> -
>  # USB host support
>  if test "$libusb" = "yes"; then
>    echo "HOST_USB=libusb legacy" >> $config_host_mak
> -- 
> 2.7.4
> 

Re: [Qemu-devel] [PATCH v2 5/8] vpc: Use QEMU UUID API

[Jeff Cody]

On Mon, Aug 08, 2016 at 02:09:25PM +0800, Fam Zheng wrote:
> Previously we conditionally generate if footer->uuid, when libuuid is

s/generate if/generated/

s/is/was/

> available. Now that we have a built-in implementation, we can switch to
> it.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  block/vpc.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/block/vpc.c b/block/vpc.c
> index 43707ed..4a60438 100644
> --- a/block/vpc.c
> +++ b/block/vpc.c
> @@ -30,9 +30,7 @@
>  #include "qemu/module.h"
>  #include "migration/migration.h"
>  #include "qemu/bswap.h"
> -#if defined(CONFIG_UUID)
> -#include <uuid/uuid.h>
> -#endif
> +#include "qemu/uuid.h"
>  
>  /**************************************************************/
>  
> @@ -980,9 +978,7 @@ static int vpc_create(const char *filename, QemuOpts *opts, Error **errp)
>  
>      footer->type = cpu_to_be32(disk_type);
>  
> -#if defined(CONFIG_UUID)
> -    uuid_generate(footer->uuid);
> -#endif
> +    qemu_uuid_generate(footer->uuid);
>  
>      footer->checksum = cpu_to_be32(vpc_checksum(buf, HEADER_SIZE));
>  
> -- 
> 2.7.4
> 

Re: [Qemu-devel] [PATCH v2 8/8] configure: Remove detection code for UUID

[Jeff Cody]

On Mon, Aug 08, 2016 at 02:09:28PM +0800, Fam Zheng wrote:
> All code now uses built-in UUID implementation. Remove the code of
> libuuid and make --enable-uuid and --disable-uuid only print a message.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  configure | 43 ++++---------------------------------------
>  1 file changed, 4 insertions(+), 39 deletions(-)
> 
> diff --git a/configure b/configure
> index cbb96d5..d6d71f3 100755
> --- a/configure
> +++ b/configure
> @@ -212,7 +212,6 @@ sdlabi=""
>  virtfs=""
>  vnc="yes"
>  sparse="no"
> -uuid=""
>  vde=""
>  vnc_sasl=""
>  vnc_jpeg=""
> @@ -881,10 +880,6 @@ for opt do
>    ;;
>    --disable-slirp) slirp="no"
>    ;;
> -  --disable-uuid) uuid="no"
> -  ;;
> -  --enable-uuid) uuid="yes"
> -  ;;
>    --disable-vde) vde="no"
>    ;;
>    --enable-vde) vde="yes"
> @@ -1096,6 +1091,9 @@ for opt do
>    --enable-vhdx|--disable-vhdx)
>        echo "$0: $opt is obsolete, VHDX driver is always built"
>    ;;
> +  --enable-uuid|--disable-uuid)
> +      echo "$0: $opt is obsolete, UUID support is always built"
> +  ;;

As with the vhdx line, this too should probably go out to stderr similar to
the data plane option.

>    --disable-gtk) gtk="no"
>    ;;
>    --enable-gtk) gtk="yes"
> @@ -1350,7 +1348,6 @@ disabled with --disable-FEATURE, default is enabled if available:
>    bluez           bluez stack connectivity
>    kvm             KVM acceleration support
>    rdma            RDMA-based migration support
> -  uuid            uuid support
>    vde             support for vde network
>    netmap          support for netmap network
>    linux-aio       Linux AIO support
> @@ -2654,34 +2651,6 @@ if compile_prog "" "" ; then
>  fi
>  
>  ##########################################
> -# uuid_generate() probe, used for vdi block driver
> -# Note that on some systems (notably MacOSX) no extra library
> -# need be linked to get the uuid functions.
> -if test "$uuid" != "no" ; then
> -  uuid_libs="-luuid"
> -  cat > $TMPC << EOF
> -#include <uuid/uuid.h>
> -int main(void)
> -{
> -    uuid_t my_uuid;
> -    uuid_generate(my_uuid);
> -    return 0;
> -}
> -EOF
> -  if compile_prog "" "" ; then
> -    uuid="yes"
> -  elif compile_prog "" "$uuid_libs" ; then
> -    uuid="yes"
> -    libs_softmmu="$uuid_libs $libs_softmmu"
> -    libs_tools="$uuid_libs $libs_tools"
> -  else
> -    if test "$uuid" = "yes" ; then
> -      feature_not_found "uuid" "Install libuuid devel"
> -    fi
> -    uuid=no
> -  fi
> -fi
> -
>  # xfsctl() probe, used for raw-posix
>  if test "$xfs" != "no" ; then
>    cat > $TMPC << EOF
> @@ -4054,7 +4023,7 @@ EOF
>    if compile_prog "$vss_win32_include" "" ; then
>      guest_agent_with_vss="yes"
>      QEMU_CFLAGS="$QEMU_CFLAGS $vss_win32_include"
> -    libs_qga="-lole32 -loleaut32 -lshlwapi -luuid -lstdc++ -Wl,--enable-stdcall-fixup $libs_qga"
> +    libs_qga="-lole32 -loleaut32 -lshlwapi -lstdc++ -Wl,--enable-stdcall-fixup $libs_qga"
>      qga_vss_provider="qga/vss-win32/qga-vss.dll qga/vss-win32/qga-vss.tlb"
>    else
>      if test "$vss_win32_sdk" != "" ; then
> @@ -4842,7 +4811,6 @@ echo "preadv support    $preadv"
>  echo "fdatasync         $fdatasync"
>  echo "madvise           $madvise"
>  echo "posix_madvise     $posix_madvise"
> -echo "uuid support      $uuid"
>  echo "libcap-ng support $cap_ng"
>  echo "vhost-net support $vhost_net"
>  echo "vhost-scsi support $vhost_scsi"
> @@ -5030,9 +4998,6 @@ fi
>  if test "$fnmatch" = "yes" ; then
>    echo "CONFIG_FNMATCH=y" >> $config_host_mak
>  fi
> -if test "$uuid" = "yes" ; then
> -  echo "CONFIG_UUID=y" >> $config_host_mak
> -fi
>  if test "$xfs" = "yes" ; then
>    echo "CONFIG_XFS=y" >> $config_host_mak
>  fi
> -- 
> 2.7.4
> 

Re: [Qemu-devel] [PATCH v2 8/8] configure: Remove detection code for UUID

[Fam Zheng]

On Mon, 08/08 16:52, Jeff Cody wrote:
> > @@ -1096,6 +1091,9 @@ for opt do
> >    --enable-vhdx|--disable-vhdx)
> >        echo "$0: $opt is obsolete, VHDX driver is always built"
> >    ;;
> > +  --enable-uuid|--disable-uuid)
> > +      echo "$0: $opt is obsolete, UUID support is always built"
> > +  ;;
> 
> As with the vhdx line, this too should probably go out to stderr similar to
> the data plane option.

Yes, will do.

Re: [Qemu-devel] [PATCH v2 5/8] vpc: Use QEMU UUID API

[Fam Zheng]

On Mon, 08/08 16:49, Jeff Cody wrote:
> On Mon, Aug 08, 2016 at 02:09:25PM +0800, Fam Zheng wrote:
> > Previously we conditionally generate if footer->uuid, when libuuid is
> 
> s/generate if/generated/
> 
> s/is/was/

Fixing, thanks!

Fam

Re: [Qemu-devel] [PATCH v2 1/8] util: Add UUID API

[Fam Zheng]

On Mon, 08/08 15:51, Jeff Cody wrote:
> > > +typedef unsigned char QemuUUID[16];
> > 
> > I'm afraid this typedef is problematic.  Consider:
> > 
> >     void use_uuid(QemuUUID uuid)
> >     {
> >         printf("sizeof(uuid) %zd\n", sizeof(uuid));
> >         uuid[0]++;
> >     }
> > 
> > QemuUUID is obviously a typedef name, so a reasonable reader may assume
> > (1) sizeof(uuid) is the size of the uuid, and (2) since uuid is passed
> > by value, the increment is not visible outside the function.  Both
> > assumptions are wrong, because array arguments degenerate into pointers.
> > 
> > I recommend to wrap it in a struct.
> >
> 
> If we are going for a semantic drop-in replacement for libuuid's uuid_t,
> Fam's typedef here is consistent with libuuid:
> 
>     typedef unsigned char uuid_t[16];
> 
> (Not to say that prohibits changing it, just pointing out there is value in
> mimicking libuuid's interfaces).

I am not 100% comforatble with libuuid way, so yes, it was for consistency. But
Markus' point is great, let's change it to the better way anyway, since it's
not a hard requirement to mimic libuuid.

Fam