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From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org,
Peter Maydell <peter.maydell@linaro.org>
Subject: [PULL 4/5] block: Add backend_defaults property
Date: Thu, 8 Jul 2021 14:11:42 +0100
Message-Id: <20210708131143.240647-5-stefanha@redhat.com>
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Cc: Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>,
Akihiko Odaki <akihiko.odaki@gmail.com>, qemu-block@nongnu.org,
Max Reitz <mreitz@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>, John Snow <jsnow@redhat.com>
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Content-Type: text/plain; charset="utf-8"
From: Akihiko Odaki <akihiko.odaki@gmail.com>
backend_defaults property allow users to control if default block
properties should be decided with backend information.
If it is off, any backend information will be discarded, which is
suitable if you plan to perform live migration to a different disk backend.
If it is on, a block device may utilize backend information more
aggressively.
By default, it is auto, which uses backend information for block
sizes and ignores the others, which is consistent with the older
versions.
Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Message-id: 20210705130458.97642-2-akihiko.odaki@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
include/hw/block/block.h | 3 +++
hw/block/block.c | 42 ++++++++++++++++++++++++++++++++++----
tests/qemu-iotests/172.out | 38 ++++++++++++++++++++++++++++++++++
3 files changed, 79 insertions(+), 4 deletions(-)
diff --git a/include/hw/block/block.h b/include/hw/block/block.h
index c172cbe65f..5902c0440a 100644
--- a/include/hw/block/block.h
+++ b/include/hw/block/block.h
@@ -19,6 +19,7 @@
=20
typedef struct BlockConf {
BlockBackend *blk;
+ OnOffAuto backend_defaults;
uint32_t physical_block_size;
uint32_t logical_block_size;
uint32_t min_io_size;
@@ -48,6 +49,8 @@ static inline unsigned int get_physical_block_exp(BlockCo=
nf *conf)
}
=20
#define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf) \
+ DEFINE_PROP_ON_OFF_AUTO("backend_defaults", _state, \
+ _conf.backend_defaults, ON_OFF_AUTO_AUTO), \
DEFINE_PROP_BLOCKSIZE("logical_block_size", _state, \
_conf.logical_block_size), \
DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \
diff --git a/hw/block/block.c b/hw/block/block.c
index 1e34573da7..d47ebf005a 100644
--- a/hw/block/block.c
+++ b/hw/block/block.c
@@ -65,24 +65,58 @@ bool blkconf_blocksizes(BlockConf *conf, Error **errp)
{
BlockBackend *blk =3D conf->blk;
BlockSizes blocksizes;
- int backend_ret;
+ BlockDriverState *bs;
+ bool use_blocksizes;
+ bool use_bs;
+
+ switch (conf->backend_defaults) {
+ case ON_OFF_AUTO_AUTO:
+ use_blocksizes =3D !blk_probe_blocksizes(blk, &blocksizes);
+ use_bs =3D false;
+ break;
+
+ case ON_OFF_AUTO_ON:
+ use_blocksizes =3D !blk_probe_blocksizes(blk, &blocksizes);
+ bs =3D blk_bs(blk);
+ use_bs =3D bs;
+ break;
+
+ case ON_OFF_AUTO_OFF:
+ use_blocksizes =3D false;
+ use_bs =3D false;
+ break;
+
+ default:
+ abort();
+ }
=20
- backend_ret =3D blk_probe_blocksizes(blk, &blocksizes);
/* fill in detected values if they are not defined via qemu command li=
ne */
if (!conf->physical_block_size) {
- if (!backend_ret) {
+ if (use_blocksizes) {
conf->physical_block_size =3D blocksizes.phys;
} else {
conf->physical_block_size =3D BDRV_SECTOR_SIZE;
}
}
if (!conf->logical_block_size) {
- if (!backend_ret) {
+ if (use_blocksizes) {
conf->logical_block_size =3D blocksizes.log;
} else {
conf->logical_block_size =3D BDRV_SECTOR_SIZE;
}
}
+ if (use_bs) {
+ if (!conf->opt_io_size) {
+ conf->opt_io_size =3D bs->bl.opt_transfer;
+ }
+ if (conf->discard_granularity =3D=3D -1) {
+ if (bs->bl.pdiscard_alignment) {
+ conf->discard_granularity =3D bs->bl.pdiscard_alignment;
+ } else if (bs->bl.request_alignment !=3D 1) {
+ conf->discard_granularity =3D bs->bl.request_alignment;
+ }
+ }
+ }
=20
if (conf->logical_block_size > conf->physical_block_size) {
error_setg(errp,
diff --git a/tests/qemu-iotests/172.out b/tests/qemu-iotests/172.out
index d53f61d0de..4cf4d536b4 100644
--- a/tests/qemu-iotests/172.out
+++ b/tests/qemu-iotests/172.out
@@ -21,6 +21,7 @@ Testing:
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -48,6 +49,7 @@ Testing: -fda TEST_DIR/t.qcow2
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -85,6 +87,7 @@ Testing: -fdb TEST_DIR/t.qcow2
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -96,6 +99,7 @@ Testing: -fdb TEST_DIR/t.qcow2
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -137,6 +141,7 @@ Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2.2
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -148,6 +153,7 @@ Testing: -fda TEST_DIR/t.qcow2 -fdb TEST_DIR/t.qcow2.2
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -190,6 +196,7 @@ Testing: -fdb
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -201,6 +208,7 @@ Testing: -fdb
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -228,6 +236,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -265,6 +274,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2,ind=
ex=3D1
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -276,6 +286,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2,ind=
ex=3D1
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -317,6 +328,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dfloppy,file=3DTEST_DIR/t
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -328,6 +340,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dfloppy,file=3DTEST_DIR/t
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -373,6 +386,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -devi=
ce floppy,drive=3Dnone0
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -410,6 +424,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -devi=
ce floppy,drive=3Dnone0,unit=3D1
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -447,6 +462,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -driv=
e if=3Dnone,file=3DTEST_DIR/t.qco
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -458,6 +474,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -driv=
e if=3Dnone,file=3DTEST_DIR/t.qco
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -509,6 +526,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -520,6 +538,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -562,6 +581,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -573,6 +593,7 @@ Testing: -fda TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -615,6 +636,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -626,6 +648,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -668,6 +691,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -679,6 +703,7 @@ Testing: -fdb TEST_DIR/t.qcow2 -drive if=3Dnone,file=3D=
TEST_DIR/t.qcow2.2 -device fl
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "floppy1"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -730,6 +755,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dnone,file=3DTEST_DIR/t.q
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -741,6 +767,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dnone,file=3DTEST_DIR/t.q
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -783,6 +810,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dnone,file=3DTEST_DIR/t.q
dev: floppy, id ""
unit =3D 1 (0x1)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -794,6 +822,7 @@ Testing: -drive if=3Dfloppy,file=3DTEST_DIR/t.qcow2 -dr=
ive if=3Dnone,file=3DTEST_DIR/t.q
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "floppy0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -842,6 +871,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -glob=
al floppy.drive=3Dnone0 -device
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -909,6 +939,7 @@ Testing: -device floppy
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D ""
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -933,6 +964,7 @@ Testing: -device floppy,drive-type=3D120
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D ""
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -957,6 +989,7 @@ Testing: -device floppy,drive-type=3D144
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D ""
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -981,6 +1014,7 @@ Testing: -device floppy,drive-type=3D288
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D ""
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -1008,6 +1042,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -de=
vice floppy,drive=3Dnone0,drive-t
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -1045,6 +1080,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -de=
vice floppy,drive=3Dnone0,drive-t
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -1085,6 +1121,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -de=
vice floppy,drive=3Dnone0,logical
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
@@ -1122,6 +1159,7 @@ Testing: -drive if=3Dnone,file=3DTEST_DIR/t.qcow2 -de=
vice floppy,drive=3Dnone0,physica
dev: floppy, id ""
unit =3D 0 (0x0)
drive =3D "none0"
+ backend_defaults =3D "auto"
logical_block_size =3D 512 (512 B)
physical_block_size =3D 512 (512 B)
min_io_size =3D 0 (0 B)
--=20
2.31.1