[PATCH v2] efi/libstub: arm*: Pass latest memory map to the kernel

On Mon, 19 Dec, at 02:24:19PM, James Morse wrote:

From: Ard Biesheuvel <redacted>

As reported by James, the current libstub code involving the annotated
memory map only works somewhat correctly by accident, due to the fact
that a pool allocation happens to be reused immediately, retaining its
former contents.

Instead of juggling memory maps, which makes the code more complex than
it needs to be, simply put a placholder value into the FDT, and only
write the actual value after ExitBootServices() has been called.

Reported-by: James Morse <james.morse@arm.com>
Signed-off-by: Ard Biesheuvel <redacted>
[Update mmap-size too, remove updated_fdt()s unused params and header entry]
Signed-off-by: James Morse <james.morse@arm.com>
---
Hi Ard,

This is a v2 of your patch that updates the mmap-size too. This solves the
truncated memmap problem I saw with v1 on Seattle.

The original patch was CC-stable, so I think this should also have:
Cc: <redacted>
Fixes: ed9cc156c42f ("efi/libstub: Use efi_exit_boot_services() in FDT")


Thanks,

James

 drivers/firmware/efi/libstub/efistub.h |  8 ----
 drivers/firmware/efi/libstub/fdt.c     | 75 +++++++++++++++++++++-------------
 2 files changed, 47 insertions(+), 36 deletions(-)

Thanks James. I've queued this one up in the 'urgent' queue and tagged
it for stable. I'll send it to tip before the end of the week.