v1: Non-standard logical geometries break under QEMU.
A virtual disk which contains an operating system which depends on logical geometries (consistent values being reported from BIOS INT13 AH=08) 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. 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. By supplying the logical geometies directly we are able to support such "exotic" disks. We will use fw_cfg to do just that. v2: Rename bootdevices fw_cfg key to bios-geoemtry v3: Change fw_cfg interface from mixed binary/textual to textual only Squash commit "config: Add toggle for bootdevice information" v4: * Rename TRANSLATION_MACHINE to TRANSLATION_HOST * Rename "overriden" translation name to "host-supplied" * Rename overriden_lchs_supplied() to host_lchs_supplied() * Move sectors and heads check to host_lchs_supplied() * Reuse duplicate code in boot.c Sam Eiderman (5): geometry: Read LCHS from fw_cfg boot: Reorder functions in boot.c boot: Build ata and scsi paths in function geometry: Add boot_lchs_find_*() utility functions geometry: Apply LCHS values for boot devices src/Kconfig | 7 ++ src/block.c | 18 +++- src/block.h | 1 + src/boot.c | 273 +++++++++++++++++++++++++++++++++++++++++---------- src/hw/ahci.c | 1 + src/hw/ata.c | 8 ++ src/hw/esp-scsi.c | 2 + src/hw/lsi-scsi.c | 2 + src/hw/megasas.c | 1 + src/hw/mpt-scsi.c | 2 + src/hw/pvscsi.c | 1 + src/hw/virtio-blk.c | 2 + src/hw/virtio-scsi.c | 2 + src/util.h | 6 ++ 14 files changed, 272 insertions(+), 54 deletions(-) -- 2.13.3
