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[Qemu-devel] [Bug 1790975] Re: Default arm virt machine broken

From: Jonathan Marler
Subject: [Qemu-devel] [Bug 1790975] Re: Default arm virt machine broken
Date: Fri, 07 Sep 2018 16:25:00 -0000

LPAE is actually disabled in my kernel config.  Knowing the cause now, I
can see that qemu would not be able to detect this problem.  This error
should have been detected in the linux kernel with an indication that
the ECAM window was using a 40-bit address but LPAE was not enabled.

** Changed in: qemu
       Status: New => Invalid

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  Default arm virt machine broken

Status in QEMU:

Bug description:
  This occurs on qemu_v3.0.0 but not on qemu_v2.12.2 (built from
  qemu_v3.0.0 tag on github)

  Symptom: You'll see something like this in the kernel output:

  [    1.285210] OF: PCI: host bridge /address@hidden ranges:
  [    1.286246] OF: PCI:    IO 0x3eff0000..0x3effffff -> 0x00000000
  [    1.287061] OF: PCI:   MEM 0x10000000..0x3efeffff -> 0x10000000
  [    1.287820] OF: PCI:   MEM 0x8000000000..0xffffffffff -> 0x8000000000
  [    1.289312] pci-host-generic 4010000000.pcie: can't claim ECAM area [mem 
0x10000000-0x1fffffff]: address conflict with /address@hidden [mem 
  [    1.290984] pci-host-generic: probe of 4010000000.pcie failed with error 

  Qemu Command Line: qemu-system-arm -machine virt -m 1024M -kernel
  zImage -serial stdio

  I can post my zImage if anyone has problems reproducing with their own

  Note that this problem breaks pci making the machine unusable.

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