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[Qemu-block] [SeaBIOS] [PATCH v3 0/4] Add Qemu to SeaBIOS LCHS interface
From: |
Sam Eiderman |
Subject: |
[Qemu-block] [SeaBIOS] [PATCH v3 0/4] Add Qemu to SeaBIOS LCHS interface |
Date: |
Wed, 19 Jun 2019 12:23:48 +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"
Sam Eiderman (4):
geometry: Read LCHS from fw_cfg
boot: Reorder functions in boot.c
geometry: Add boot_lchs_find_*() utility functions
geometry: Apply LCHS values for boot devices
src/Kconfig | 7 ++
src/block.c | 21 ++++-
src/block.h | 1 +
src/boot.c | 239 +++++++++++++++++++++++++++++++++++++++++----------
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, 249 insertions(+), 46 deletions(-)
--
2.13.3
- [Qemu-block] [SeaBIOS] [PATCH v3 0/4] Add Qemu to SeaBIOS LCHS interface,
Sam Eiderman <=
- [Qemu-block] [SeaBIOS] [PATCH v3 1/4] geometry: Read LCHS from fw_cfg, Sam Eiderman, 2019/06/19
- [Qemu-block] [SeaBIOS] [PATCH v3 2/4] boot: Reorder functions in boot.c, Sam Eiderman, 2019/06/19
- [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/19
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Kevin O'Connor, 2019/06/20
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/21
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Kevin O'Connor, 2019/06/21
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/22
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Kevin O'Connor, 2019/06/22
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/22
- Re: [Qemu-block] [SeaBIOS] [PATCH v3 3/4] geometry: Add boot_lchs_find_*() utility functions, Sam Eiderman, 2019/06/26