From 84b0475ced86d7e0f182f0753b23f5977fdb201e Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Mon, 22 Jun 2020 11:42:22 +0200 Subject: [PATCH] qdev: Reject drive property override qdev_prop_set_drive() screws up when the property already has a non-null value: it neglects to release the old value. Both the old and the new backend become attached to the same device. Example (taken from iotest 172): -fda ... -drive if=none,... -global floppy.drive=none0. Special case: attempting to use the same backend both times fails. Example (also from iotest 172): -fda ... -global floppy.drive=floppy0. Yet another example: -device with multiple drive=... (but not device_add, which silently drops all but the last duplicate property). Perhaps drive property override could be made to work. Perhaps it should. I can't afford the time to figure this out now. What I can do is reject usage that leaves backends in unhealthy states. For what it's worth, we've long done the same for netdev properties. Signed-off-by: Markus Armbruster Message-Id: <20200622094227.1271650-12-armbru@redhat.com> --- hw/core/qdev-properties-system.c | 8 +++ tests/qemu-iotests/172.out | 88 ++------------------------------ 2 files changed, 11 insertions(+), 85 deletions(-) diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 3f84309b7e..6b5fc59901 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -98,6 +98,14 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name, return; } + /* + * TODO Should this really be an error? If no, the old value + * needs to be released before we store the new one. + */ + if (!check_prop_still_unset(dev, name, *ptr, str, errp)) { + return; + } + if (!*str) { g_free(str); *ptr = NULL; diff --git a/tests/qemu-iotests/172.out b/tests/qemu-iotests/172.out index 778406e4bf..cca2894af0 100644 --- a/tests/qemu-iotests/172.out +++ b/tests/qemu-iotests/172.out @@ -795,48 +795,7 @@ Use -device floppy,unit=1,drive=... instead. QEMU_PROG: Floppy unit 1 is in use Testing: -fda TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global floppy.drive=none0 - - dev: isa-fdc, id "" - iobase = 1008 (0x3f0) - irq = 6 (0x6) - dma = 2 (0x2) - driveA = "" - driveB = "" - check_media_rate = true - fdtypeA = "auto" - fdtypeB = "auto" - fallback = "288" - isa irq 6 - bus: floppy-bus.0 - type floppy-bus - dev: floppy, id "" - unit = 0 (0x0) - drive = "floppy0" - logical_block_size = 512 (512 B) - physical_block_size = 512 (512 B) - min_io_size = 0 (0 B) - opt_io_size = 0 (0 B) - discard_granularity = 4294967295 (4 GiB) - write-cache = "auto" - share-rw = false - drive-type = "144" -floppy0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2) - Attached to: /machine/unattached/device[15] - Removable device: not locked, tray closed - Cache mode: writeback - -none0 (NODE_NAME): TEST_DIR/t.qcow2.2 (qcow2) - Attached to: /machine/unattached/device[15] - Cache mode: writeback - -ide1-cd0: [not inserted] - Attached to: /machine/unattached/device[22] - Removable device: not locked, tray closed - -sd0: [not inserted] - Removable device: not locked, tray closed -(qemu) quit - +QEMU_PROG: -global floppy.drive=... conflicts with drive=floppy0 === Mixing -fdX and -device === @@ -1475,48 +1434,7 @@ Use -device floppy,unit=1,drive=... instead. QEMU_PROG: -device floppy,drive=none1,unit=1: Floppy unit 1 is in use Testing: -drive if=none,file=TEST_DIR/t.qcow2 -drive if=none,file=TEST_DIR/t.qcow2.2 -global floppy.drive=none0 -device floppy,drive=none1,unit=0 - - dev: isa-fdc, id "" - iobase = 1008 (0x3f0) - irq = 6 (0x6) - dma = 2 (0x2) - driveA = "" - driveB = "" - check_media_rate = true - fdtypeA = "auto" - fdtypeB = "auto" - fallback = "288" - isa irq 6 - bus: floppy-bus.0 - type floppy-bus - dev: floppy, id "" - unit = 0 (0x0) - drive = "none1" - logical_block_size = 512 (512 B) - physical_block_size = 512 (512 B) - min_io_size = 0 (0 B) - opt_io_size = 0 (0 B) - discard_granularity = 4294967295 (4 GiB) - write-cache = "auto" - share-rw = false - drive-type = "144" -none0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2) - Attached to: /machine/peripheral-anon/device[0] - Cache mode: writeback - -none1 (NODE_NAME): TEST_DIR/t.qcow2.2 (qcow2) - Attached to: /machine/peripheral-anon/device[0] - Removable device: not locked, tray closed - Cache mode: writeback - -ide1-cd0: [not inserted] - Attached to: /machine/unattached/device[21] - Removable device: not locked, tray closed - -sd0: [not inserted] - Removable device: not locked, tray closed -(qemu) quit - +QEMU_PROG: -device floppy,drive=none1,unit=0: -global floppy.drive=... conflicts with drive=none1 === Attempt to use drive twice === @@ -1531,7 +1449,7 @@ Testing: -fda -device floppy,drive=floppy0 QEMU_PROG: -device floppy,drive=floppy0: Drive 'floppy0' is already in use because it has been automatically connected to another device (did you need 'if=none' in the drive options?) Testing: -fda -global floppy.drive=floppy0 -QEMU_PROG: Drive 'floppy0' is already in use because it has been automatically connected to another device (did you need 'if=none' in the drive options?) +QEMU_PROG: -global floppy.drive=... conflicts with drive=floppy0 Testing: -device floppy,drive=floppy0 QEMU_PROG: -device floppy,drive=floppy0: Property 'floppy.drive' can't find value 'floppy0'