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[Qemu-block] [PATCH 3/3] uuid: Make qemu_uuid_bswap() take and return a
From: |
Peter Maydell |
Subject: |
[Qemu-block] [PATCH 3/3] uuid: Make qemu_uuid_bswap() take and return a QemuUUID |
Date: |
Mon, 10 Dec 2018 11:26:49 +0000 |
Currently qemu_uuid_bswap() takes a pointer to the QemuUUID to
be byte-swapped. This means it can't be used when the UUID
to be swapped is in a packed member of a struct. It's also
out of line with the general bswap*() functions we provide
in bswap.h, which take the value to be swapped and return it.
Make qemu_uuid_bswap() take a QemuUUID and return the swapped version.
This fixes some clang warnings about taking the address of
a packed struct member in block/vdi.c.
Signed-off-by: Peter Maydell <address@hidden>
---
include/qemu/uuid.h | 2 +-
block/vdi.c | 16 ++++++++--------
hw/acpi/vmgenid.c | 6 ++----
tests/vmgenid-test.c | 2 +-
util/uuid.c | 10 +++++-----
5 files changed, 17 insertions(+), 19 deletions(-)
diff --git a/include/qemu/uuid.h b/include/qemu/uuid.h
index 09489ce5c5e..037357d990b 100644
--- a/include/qemu/uuid.h
+++ b/include/qemu/uuid.h
@@ -56,6 +56,6 @@ char *qemu_uuid_unparse_strdup(const QemuUUID *uuid);
int qemu_uuid_parse(const char *str, QemuUUID *uuid);
-void qemu_uuid_bswap(QemuUUID *uuid);
+QemuUUID qemu_uuid_bswap(QemuUUID uuid);
#endif
diff --git a/block/vdi.c b/block/vdi.c
index 4cc726047c3..0c34f6bae46 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -203,10 +203,10 @@ static void vdi_header_to_cpu(VdiHeader *header)
header->block_extra = le32_to_cpu(header->block_extra);
header->blocks_in_image = le32_to_cpu(header->blocks_in_image);
header->blocks_allocated = le32_to_cpu(header->blocks_allocated);
- qemu_uuid_bswap(&header->uuid_image);
- qemu_uuid_bswap(&header->uuid_last_snap);
- qemu_uuid_bswap(&header->uuid_link);
- qemu_uuid_bswap(&header->uuid_parent);
+ header->uuid_image = qemu_uuid_bswap(header->uuid_image);
+ header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
+ header->uuid_link = qemu_uuid_bswap(header->uuid_link);
+ header->uuid_parent = qemu_uuid_bswap(header->uuid_parent);
}
static void vdi_header_to_le(VdiHeader *header)
@@ -227,10 +227,10 @@ static void vdi_header_to_le(VdiHeader *header)
header->block_extra = cpu_to_le32(header->block_extra);
header->blocks_in_image = cpu_to_le32(header->blocks_in_image);
header->blocks_allocated = cpu_to_le32(header->blocks_allocated);
- qemu_uuid_bswap(&header->uuid_image);
- qemu_uuid_bswap(&header->uuid_last_snap);
- qemu_uuid_bswap(&header->uuid_link);
- qemu_uuid_bswap(&header->uuid_parent);
+ header->uuid_image = qemu_uuid_bswap(header->uuid_image);
+ header->uuid_last_snap = qemu_uuid_bswap(header->uuid_last_snap);
+ header->uuid_link = qemu_uuid_bswap(header->uuid_link);
+ header->uuid_parent = qemu_uuid_bswap(header->uuid_parent);
}
static void vdi_header_print(VdiHeader *header)
diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c
index d78b579a201..02717a8b0dc 100644
--- a/hw/acpi/vmgenid.c
+++ b/hw/acpi/vmgenid.c
@@ -30,8 +30,7 @@ void vmgenid_build_acpi(VmGenIdState *vms, GArray
*table_data, GArray *guid,
* first, since that's what the guest expects
*/
g_array_set_size(guid, VMGENID_FW_CFG_SIZE - ARRAY_SIZE(guid_le.data));
- guid_le = vms->guid;
- qemu_uuid_bswap(&guid_le);
+ guid_le = qemu_uuid_bswap(vms->guid);
/* The GUID is written at a fixed offset into the fw_cfg file
* in order to implement the "OVMF SDT Header probe suppressor"
* see docs/specs/vmgenid.txt for more details
@@ -149,8 +148,7 @@ static void vmgenid_update_guest(VmGenIdState *vms)
* however, will expect the fields to be little-endian.
* Perform a byte swap immediately before writing.
*/
- guid_le = vms->guid;
- qemu_uuid_bswap(&guid_le);
+ guid_le = qemu_uuid_bswap(vms->guid);
/* The GUID is written at a fixed offset into the fw_cfg file
* in order to implement the "OVMF SDT Header probe suppressor"
* see docs/specs/vmgenid.txt for more details.
diff --git a/tests/vmgenid-test.c b/tests/vmgenid-test.c
index 0a6fb55f2eb..98db43f5a65 100644
--- a/tests/vmgenid-test.c
+++ b/tests/vmgenid-test.c
@@ -110,7 +110,7 @@ static void read_guid_from_memory(QemuUUID *guid)
/* The GUID is in little-endian format in the guest, while QEMU
* uses big-endian. Swap after reading.
*/
- qemu_uuid_bswap(guid);
+ *guid = qemu_uuid_bswap(*guid);
}
static void read_guid_from_monitor(QemuUUID *guid)
diff --git a/util/uuid.c b/util/uuid.c
index ebf06c049ad..5787f0978c1 100644
--- a/util/uuid.c
+++ b/util/uuid.c
@@ -110,10 +110,10 @@ int qemu_uuid_parse(const char *str, QemuUUID *uuid)
/* Swap from UUID format endian (BE) to the opposite or vice versa.
*/
-void qemu_uuid_bswap(QemuUUID *uuid)
+QemuUUID qemu_uuid_bswap(QemuUUID uuid)
{
- assert(QEMU_PTR_IS_ALIGNED(uuid, sizeof(uint32_t)));
- bswap32s(&uuid->fields.time_low);
- bswap16s(&uuid->fields.time_mid);
- bswap16s(&uuid->fields.time_high_and_version);
+ bswap32s(&uuid.fields.time_low);
+ bswap16s(&uuid.fields.time_mid);
+ bswap16s(&uuid.fields.time_high_and_version);
+ return uuid;
}
--
2.19.2