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[Qemu-arm] [PATCH 0/2] hw/arm/boot: handle large Images more gracefully

From: Peter Maydell
Subject: [Qemu-arm] [PATCH 0/2] hw/arm/boot: handle large Images more gracefully
Date: Fri, 3 May 2019 18:13:45 +0100

This patchset attempts to fix https://bugs.launchpad.net/qemu/+bug/1823998
which reports that we don't handle kernels larger than 128MB
correctly, because we allow the initrd to be placed over the
tail end of the kernel. AArch64 kernel Image files (since v3.17)
report the total size they require (including any BSS area that
isn't in the Image itself), so we can use that to be sure we
place the initrd sufficiently far into the RAM.

Patch 1 in this series adjusts our "where do we put the initrd"
heuristic so that it always places it at least after whatever
our best guess at the kernel size is. (This might still not
be right for images like self-decompressing 32-bit kernels, where
there's no way to know how big the kernel will be after
decompression.) Patch 2 makes load_aarch64_image() return the
kernel size as indicated in the Image file header, so that for
the specific case of AArch64 Image files we will definitely not
put the initrd on top of them.

I've given this a quick smoke test but I don't have a very large
Image kernel to hand, so testing appreciated.

-- PMM

Peter Maydell (2):
  hw/arm/boot: Avoid placing the initrd on top of the kernel
  hw/arm/boot: Honour image size field in AArch64 Image format kernels

 hw/arm/boot.c | 51 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 35 insertions(+), 16 deletions(-)


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