When QemuBootOrder finds at least one match between the "bootorder"
fw_cfg file (after translation) and the enumerated, active UEFI boot
options, QemuBootOrder rewrites the BootOrder variable so that it
reflects the order requested via fw_cfg.
Until now, each boot option that remained unmatched by all fw_cfg
entries used to get a visit from the guy with the big scythe.
Unfortunately, there are some boot options that cannot be expressed via
fw_cfg at all, such as the memory-mapped EFI shell. Consequently,
whenever the intersection between fw_cfg's "bootorder" and the UEFI boot
option enumeration was nonempty, QemuBootOrder invariably deleted the
EFI shell's option.
These patches introduce an "infrastructure" and a first-approach
"policy" to salvage boot options that would fall off the wagon under the
above circumstances:
- Mark all options that have been matched by some fw_cfg bootorder
entry.
- After the outer matching/picking loop is complete, iterate over the
enumerated boot options.
- For each unmarked option: if it starts with HD() or PciRoot(), skip it
(the user could have added it to fw_cfg if he/she had wanted it). If
it starts with something else (no way for the user to specify), append
it to the end. This should also keep relative ordering between such
"unspecifiable" entries.
As a result, the EFI shell's option survives, at the trailing edge of
the boot order. If necessary, the policy can be refined going forward.
Note: this series is independent of my
[PATCH] OvmfPkg: QemuBootOrder: expand relative device paths in UEFI
boot options
(which has been Tested-by: Michael Chang <mch...@suse.com>). Said patch
and this series can be applied in isolation, or in combination, in any
order. I tested the tree with both applied in chronological / posting
order.
Thanks,
Laszlo
Laszlo Ersek (3):
OvmfPkg: QemuBootOrder: collect active UEFI boot options in advance
OvmfPkg: QemuBootOrder: mark UEFI boot options selected by fw_cfg
OvmfPkg: QemuBootOrder: keep some boot options that have not been
selected
OvmfPkg/Library/PlatformBdsLib/QemuBootOrder.c | 239 +++++++++++++++++++++---
1 files changed, 215 insertions(+), 24 deletions(-)
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