On Mon, 15 Aug, at 01:22:09PM, Jeffrey Hugo wrote:
> According to the UEFI spec, the UEFI OS Loader (aka the stub) should
> transition from UEFI to the OS by getting the current memory map from UEFI,
> then calling ExitBootServices. The spec states that ExitBootServices may
> return EFI_INVALID_PARAMETER if the memory map reference provided by the stub
> is not current, ie UEFI handled some event prior to ExitBootServices which
> modified the map. The spec states that to handle this scenario, the stub shall
> get the updated map, and invoke ExitBootServices again. The spec also states
> that once ExitBootServices is invoked, even if it returns error, the only
> APIs the stub is allowed to invoke is GetMemoryMap and ExitBootServices.
>
> The EFI_INVALID_PARAMETER scenario has been seen in the wild previously in
> x86 but the fix - d3768d885c6c ("x86, efi: retry ExitBootServices() on failure")
> still violates the spec. The FDT code does not handle this scenario, but
> instances of it are now observed.
>
> This patch series aims to provide a spec complaint solution that can be reused
> in all stubs, thus preventing each arch or variant from reinventing the wheel
> and likely getting it wrong.
This Jeffrey. This version looks much better and it passes all my
tests.
Queued up in 'urgent'.
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