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[Qemu-block] [SeaBIOS] [PATCH v4 0/5] Add Qemu to SeaBIOS LCHS interface
From: |
Sam Eiderman |
Subject: |
[Qemu-block] [SeaBIOS] [PATCH v4 0/5] Add Qemu to SeaBIOS LCHS interface |
Date: |
Wed, 26 Jun 2019 15:38:11 +0300 |
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
- [Qemu-block] [SeaBIOS] [PATCH v4 0/5] Add Qemu to SeaBIOS LCHS interface,
Sam Eiderman <=
- [Qemu-block] [SeaBIOS] [PATCH v4 1/5] geometry: Read LCHS from fw_cfg, Sam Eiderman, 2019/06/26
- [Qemu-block] [SeaBIOS] [PATCH v4 3/5] boot: Build ata and scsi paths in function, Sam Eiderman, 2019/06/26
- [Qemu-block] [SeaBIOS] [PATCH v4 2/5] boot: Reorder functions in boot.c, Sam Eiderman, 2019/06/26
- [Qemu-block] [SeaBIOS] [PATCH v4 5/5] geometry: Apply LCHS values for boot devices, Sam Eiderman, 2019/06/26
- [Qemu-block] [SeaBIOS] [PATCH v4 4/5] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/26