Am 20.05.2020 um 10:06 hat Roman Kagan geschrieben: > Devices (virtio-blk, scsi, etc.) and the block layer are happy to use > 32-bit for logical_block_size, physical_block_size, and min_io_size. > However, the properties in BlockConf are defined as uint16_t limiting > the values to 32768. > > This appears unnecessary tight, and we've seen bigger block sizes handy > at times. > > Make them 32 bit instead and lift the limitation up to 2 MiB which > appears to be good enough for everybody, and matches the qcow2 cluster > size limit. > > As the values can now be fairly big and awkward to type, make the > property setter accept common size suffixes (k, m). > > Also as the devices which use min_io_size (virtio-blk and scsi) pass its > value to the guest in units of logical blocks in a 16bit field, to > prevent its silent truncation add a corresponding check to > blkconf_blocksizes. > > Signed-off-by: Roman Kagan <rvka...@yandex-team.ru> > --- > v3 -> v4: > - check min_io_size against truncation [Kevin] > > v2 -> v3: > - mention qcow2 cluster size limit in the log and comment [Eric] > > v1 -> v2: > - cap the property at 2 MiB [Eric] > - accept size suffixes > > include/hw/block/block.h | 8 ++++---- > include/hw/qdev-properties.h | 2 +- > hw/block/block.c | 11 +++++++++++ > hw/core/qdev-properties.c | 34 ++++++++++++++++++++++++---------- > 4 files changed, 40 insertions(+), 15 deletions(-) > > diff --git a/include/hw/block/block.h b/include/hw/block/block.h > index 784953a237..2fa09aa0b1 100644 > --- a/include/hw/block/block.h > +++ b/include/hw/block/block.h > @@ -18,9 +18,9 @@ > > typedef struct BlockConf { > BlockBackend *blk; > - uint16_t physical_block_size; > - uint16_t logical_block_size; > - uint16_t min_io_size; > + uint32_t physical_block_size; > + uint32_t logical_block_size; > + uint32_t min_io_size; > uint32_t opt_io_size; > int32_t bootindex; > uint32_t discard_granularity; > @@ -51,7 +51,7 @@ static inline unsigned int get_physical_block_exp(BlockConf > *conf) > _conf.logical_block_size), \ > DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \ > _conf.physical_block_size), \ > - DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \ > + DEFINE_PROP_UINT32("min_io_size", _state, _conf.min_io_size, 0), \ > DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \ > DEFINE_PROP_UINT32("discard_granularity", _state, \ > _conf.discard_granularity, -1), \ > diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h > index f161604fb6..f9e0f8c041 100644 > --- a/include/hw/qdev-properties.h > +++ b/include/hw/qdev-properties.h > @@ -197,7 +197,7 @@ extern const PropertyInfo qdev_prop_pcie_link_width; > #define DEFINE_PROP_BIOS_CHS_TRANS(_n, _s, _f, _d) \ > DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_bios_chs_trans, int) > #define DEFINE_PROP_BLOCKSIZE(_n, _s, _f) \ > - DEFINE_PROP_UNSIGNED(_n, _s, _f, 0, qdev_prop_blocksize, uint16_t) > + DEFINE_PROP_UNSIGNED(_n, _s, _f, 0, qdev_prop_blocksize, uint32_t) > #define DEFINE_PROP_PCI_HOST_DEVADDR(_n, _s, _f) \ > DEFINE_PROP(_n, _s, _f, qdev_prop_pci_host_devaddr, PCIHostDeviceAddress) > #define DEFINE_PROP_OFF_AUTO_PCIBAR(_n, _s, _f, _d) \ > diff --git a/hw/block/block.c b/hw/block/block.c > index 5f8ebff59c..cd95e7e38f 100644 > --- a/hw/block/block.c > +++ b/hw/block/block.c > @@ -96,6 +96,17 @@ bool blkconf_blocksizes(BlockConf *conf, Error **errp) > return false; > } > > + /* > + * all devices which support min_io_size (scsi and virtio-blk) expose it > to > + * the guest as a uint16_t in units of logical blocks > + */ > + if ((conf->min_io_size / conf->logical_block_size) > UINT16_MAX) { > + error_setg(errp, > + "min_io_size must be no more than " stringify(UINT16_MAX) > + " of logical_block_size");
I'm not a native speaker, but "no more than 65536 of logical_block_size" sounds odd to me. Maybe "65536 times the logical_block_size"? > + return false; > + } > + > if (conf->opt_io_size % conf->logical_block_size) { > error_setg(errp, > "opt_io_size must be a multple of logical_block_size"); Kevin