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[Qemu-devel] [Bug 1735653] Re: qemu aarch64 cannot boot linux kernel v4.


From: Peter Maydell
Subject: [Qemu-devel] [Bug 1735653] Re: qemu aarch64 cannot boot linux kernel v4.6+
Date: Fri, 15 Dec 2017 15:04:14 -0000

This bug was fixed in QEMU commit e20d84c1407d43d, back in 2016. Are you
sure you're running the version of QEMU which you've just built, and not
the installed system one (which is likely to be older)? Your command
line suggests you're running the system one. The newly built binary will
be ./aarch64-softmmu/qemu-system-aarch64 in the build directory (and you
can check using the --version option what binary you're running).

-- 
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https://bugs.launchpad.net/bugs/1735653

Title:
  qemu aarch64 cannot boot linux kernel v4.6+

Status in QEMU:
  New

Bug description:
  Hi,
  I tested the latest qemu-system-aarch64 cannot boot linux mainline kernel 
since v4.6 from 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git.

  Environment info:
  # host
   ubuntu 16.04
  # qemu
   Master branch from git://git.qemu.org/qemu.git, and now the HEAD is 
c11d61271b9e6e7a1f0479ef1ca8fb55fa457a62.
  # build command
   ./configure --target-list=aarch64-softmmu
   make
  # qemu commmand
   qemu-system-aarch64 -machine virt -cpu cortex-a57 -machine type=virt -smp 4 
-m 1024 -nographic -s -kernel ~/workspace/linux/arch/arm64/boot/Image -device 
e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::2222-:22

  Error info:
   No error prompted, actually no any log which means I couldn't see the 
usually kernel boot message.

  Debug info:
   I did a git bisect on linux, and found with this kernel commit, qemu failed 
to boot. Parent of 406e308770a92bd33995b2e5b681e86358328bb0 can boot.
   commit 406e308770a92bd33995b2e5b681e86358328bb0
      Author: James Morse <address@hidden>
      Date:   Fri Feb 5 14:58:47 2016 +0000

      arm64: add ARMv8.2 id_aa64mmfr2 boiler plate

      ARMv8.2 adds a new feature register id_aa64mmfr2. This patch adds the
      cpu feature boiler plate used by the actual features in later patches.

      Signed-off-by: James Morse <address@hidden>
      Reviewed-by: Suzuki K Poulose <address@hidden>
      Signed-off-by: Catalin Marinas <address@hidden>
   The main change in the patch is to add reg_id_aa64mmfr2 in to 
arch/arm64/include/asm/cpu.h, so might it be any struct change not included in 
qemu?

  Can you please help check how to fix it?

  Thanks

  - Joey

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