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[PATCH v8 8/8] block: lift blocksize property limit to 2 MiB
From: |
Roman Kagan |
Subject: |
[PATCH v8 8/8] block: lift blocksize property limit to 2 MiB |
Date: |
Fri, 29 May 2020 01:55:16 +0300 |
Logical and physical block sizes in QEMU are limited to 32 KiB.
This appears unnecessarily tight, and we've seen bigger block sizes
handy at times.
Lift the limitation up to 2 MiB which appears to be good enough for
everybody, and matches the qcow2 cluster size limit.
Signed-off-by: Roman Kagan <rvkagan@yandex-team.ru>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
hw/core/qdev-properties.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 63d48db70c..ead35d7ffd 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -784,9 +784,12 @@ const PropertyInfo qdev_prop_size32 = {
/* lower limit is sector size */
#define MIN_BLOCK_SIZE 512
#define MIN_BLOCK_SIZE_STR "512 B"
-/* upper limit is the max power of 2 that fits in uint16_t */
-#define MAX_BLOCK_SIZE (32 * KiB)
-#define MAX_BLOCK_SIZE_STR "32 KiB"
+/*
+ * upper limit is arbitrary, 2 MiB looks sufficient for all sensible uses, and
+ * matches qcow2 cluster size limit
+ */
+#define MAX_BLOCK_SIZE (2 * MiB)
+#define MAX_BLOCK_SIZE_STR "2 MiB"
static void set_blocksize(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
--
2.26.2
- [PATCH v8 0/8] block: enhance handling of size-related BlockConf properties, Roman Kagan, 2020/05/28
- [PATCH v8 1/8] virtio-blk: store opt_io_size with correct size, Roman Kagan, 2020/05/28
- [PATCH v8 2/8] block: consolidate blocksize properties consistency checks, Roman Kagan, 2020/05/28
- [PATCH v8 3/8] qdev-properties: blocksize: use same limits in code and description, Roman Kagan, 2020/05/28
- [PATCH v8 4/8] qdev-properties: add size32 property type, Roman Kagan, 2020/05/28
- [PATCH v8 5/8] qdev-properties: make blocksize accept size suffixes, Roman Kagan, 2020/05/28
- [PATCH v8 6/8] block: make BlockConf size props 32bit and accept size suffixes, Roman Kagan, 2020/05/28
- [PATCH v8 7/8] qdev-properties: add getter for size32 and blocksize, Roman Kagan, 2020/05/28
- [PATCH v8 8/8] block: lift blocksize property limit to 2 MiB,
Roman Kagan <=