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aea60a13b9
Using fw_cfg, supply logical CHS values directly from QEMU to the BIOS. 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 report - SeaBIOS, for large enough disks - will use LBA translation, which will report 63 SPT instead. In addition we cannot force SeaBIOS to rely on physical geometries at all. A virtio-blk-pci virtual disk with 255 phyiscal heads cannot report more than 16 physical heads when moved to an IDE controller, since the ATA spec allows a maximum of 16 heads - this is an artifact of virtualization. By supplying the logical geometries directly we are able to support such "exotic" disks. We serialize this information in a similar way to the "bootorder" interface. The new fw_cfg entry is "bios-geometry". Reviewed-by: Karl Heubaum <karl.heubaum@oracle.com> Reviewed-by: Arbel Moshe <arbel.moshe@oracle.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Sam Eiderman <shmuel.eiderman@oracle.com> Signed-off-by: Sam Eiderman <sameid@google.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: John Snow <jsnow@redhat.com> |
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| .. | ||
| accel.h | ||
| arch_init.h | ||
| balloon.h | ||
| block-backend.h | ||
| blockdev.h | ||
| bt.h | ||
| cpus.h | ||
| cryptodev-vhost-user.h | ||
| cryptodev-vhost.h | ||
| cryptodev.h | ||
| device_tree.h | ||
| dma.h | ||
| dump-arch.h | ||
| dump.h | ||
| hax.h | ||
| hostmem.h | ||
| hvf.h | ||
| hw_accel.h | ||
| iothread.h | ||
| kvm.h | ||
| kvm_int.h | ||
| memory_mapping.h | ||
| numa.h | ||
| os-posix.h | ||
| os-win32.h | ||
| qtest.h | ||
| replay.h | ||
| reset.h | ||
| rng-random.h | ||
| rng.h | ||
| runstate.h | ||
| seccomp.h | ||
| sev.h | ||
| sysemu.h | ||
| tcg.h | ||
| tpm.h | ||
| tpm_backend.h | ||
| vhost-user-backend.h | ||
| watchdog.h | ||
| whpx.h | ||
| xen-mapcache.h | ||