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[Qemu-devel] [Bug 1823998] Re: qemu-system-aarch64: support kernels bigg

From: Peter Maydell
Subject: [Qemu-devel] [Bug 1823998] Re: qemu-system-aarch64: support kernels bigger than 128MiB
Date: Mon, 08 Jul 2019 15:18:25 -0000

Changes now in master, will be in 4.1.

** Changed in: qemu
       Status: In Progress => Fix Committed

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  qemu-system-aarch64: support kernels bigger than 128MiB

Status in QEMU:
  Fix Committed

Bug description:
  Presently QEMU reserves up to 128MiB of space for an arm64 Linux
  kernel, placing the initrd following this, and the dtb following the

  This is not sufficient for some debug configurations of the kernel,
  which can be larger than 128MiB. Depending on the relative size of the
  kernel Image and unpopulated BSS, the dtb (or kernel) will be
  clobbered by the other, resulting in a silent boot failure.

  Since v3.17, the kernel Image header exposes a field called
  image_size, which describes the entire size of the kernel (including
  unpopulated sections such as the BSS) as a 64-bit little-endian value.
  For kernels prior to v3.17, this field is zero. This is documented at:


  It would be great if QEMU could take the image_size field into account
  when placing the initrd and dtb to avoid overlap with the kernel.

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