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List-Subscribe: , Cc: kwolf@redhat.com, qemu-block@nongnu.org, arbel.moshe@oracle.com, philmd@redhat.com, seabios@seabios.org, kevin@koconnor.net, liran.alon@oracle.com, kraxel@redhat.com, lersek@redhat.com, karl.heubaum@oracle.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 10/16/19 12:41 PM, Sam Eiderman wrote: >=20 > v1: >=20 > Non-standard logical geometries break under QEMU. >=20 > A virtual disk which contains an operating system which depends on > logical geometries (consistent values being reported from BIOS INT13 > AH=3D08) will most likely break under QEMU/SeaBIOS if it has non-standard > logical geometries - for example 56 SPT (sectors per track). > No matter what QEMU will guess - SeaBIOS, for large enough disks - will > use LBA translation, which will report 63 SPT instead. >=20 > In addition we can not enforce SeaBIOS to rely on phyiscal geometries at > all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not > report more than 16 physical heads when moved to an IDE controller, the > ATA spec allows a maximum of 16 heads - this is an artifact of > virtualization. >=20 > By supplying the logical geometies directly we are able to support such > "exotic" disks. >=20 > We will use fw_cfg to do just that. >=20 > v2: >=20 > Fix missing parenthesis check in > "hd-geo-test: Add tests for lchs override" >=20 > v3: >=20 > * Rename fw_cfg key to "bios-geometry". > * Remove "extendible" interface. > * Add cpu_to_le32 fix as Laszlo suggested or big endian hosts > * Fix last qtest commit - automatic docker tester for some reason does no= t have qemu-img set >=20 > v4: >=20 > * Change fw_cfg interface from mixed textual/binary to textual only >=20 > v5: >=20 > * Fix line > 80 chars in tests/hd-geo-test.c >=20 > v6: >=20 > * Small fixes for issues pointed by Max > * (&conf->conf)->lcyls to conf->conf.lcyls and so on > * Remove scsi_unrealize from everything other than scsi-hd > * Add proper include to sysemu.h > * scsi_device_unrealize() after scsi_device_purge_requests() >=20 > v7: >=20 > * Adapted last commit (tests) to changes in qtest >=20 > v8: >=20 > * Fixed BE issue with tests by using qfw_cfg_get_file() instead of > read_fw_cfg_file(), thanks Laszlo. > * Removed incorrect comment in 7/8. >=20 > Sam Eiderman (8): > block: Refactor macros - fix tabbing > block: Support providing LCHS from user > bootdevice: Add interface to gather LCHS > scsi: Propagate unrealize() callback to scsi-hd > bootdevice: Gather LCHS from all relevant devices > bootdevice: Refactor get_boot_devices_list > bootdevice: FW_CFG interface for LCHS values > hd-geo-test: Add tests for lchs override >=20 > bootdevice.c | 147 +++++++++-- > hw/block/virtio-blk.c | 6 + > hw/ide/qdev.c | 7 +- > hw/nvram/fw_cfg.c | 14 +- > hw/scsi/scsi-bus.c | 16 ++ > hw/scsi/scsi-disk.c | 12 + > include/hw/block/block.h | 22 +- > include/hw/scsi/scsi.h | 1 + > include/sysemu/sysemu.h | 4 + > tests/Makefile.include | 2 +- > tests/hd-geo-test.c | 551 +++++++++++++++++++++++++++++++++++++++ > 11 files changed, 741 insertions(+), 41 deletions(-) >=20 Thanks, applied to my IDE tree: https://github.com/jnsnow/qemu/commits/ide https://github.com/jnsnow/qemu.git --js (Philippe, you have a few days to check that I didn't snub your reviews if you want to look ...!)