From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1823998] Re: qemu-system-aarch64: support kernels bigger than 128MiB
Date: Fri, 03 May 2019 16:36:51 -0000 [thread overview]
Message-ID: <155690141223.19580.17385068954807494182.launchpad@gac.canonical.com> (raw)
In-Reply-To: 155483243569.8652.5979441352991477638.malonedeb@wampee.canonical.com
** Tags added: arm
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https://bugs.launchpad.net/bugs/1823998
Title:
qemu-system-aarch64: support kernels bigger than 128MiB
Status in QEMU:
New
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
initrd.
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:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/arm64/booting.txt?h=v5.0#n68
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1823998/+subscriptions
next prev parent reply other threads:[~2019-05-03 16:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-09 17:53 [Qemu-devel] [Bug 1823998] [NEW] qemu-system-aarch64: support kernels bigger than 128MiB Mark Rutland
2019-04-09 17:53 ` Mark Rutland
2019-05-03 16:36 ` Peter Maydell [this message]
2019-05-03 16:36 ` [Qemu-devel] [Bug 1823998] " Peter Maydell
2019-05-03 17:18 ` Peter Maydell
2019-05-03 17:18 ` Peter Maydell
2019-07-08 15:18 ` Peter Maydell
2019-08-16 4:51 ` Thomas Huth
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