QEMU .qcow2 mmu_gva_to_gpa crash in Mac OS X - Debian

cccnrc
February 14, 2020
115 views
0 votes
2 Answers

I am trying to run my .qcow2 image in Mac OS X with qemu-system-x86_64, it works perfectly fine on my Debian machine but for memory problems I need to move it to a Mac OS X Catalina machine. I installed qemu-system-x86_64 through brew and then when I launch my machine with

qemu-system-x86_64 
>   -m 8G 
>   -vga virtio 
>   -show-cursor 
>   -usb 
>   -device usb-tablet 
>   -enable-kvm 
>   -drive file=/Volumes/enricoWD/transfer_home_laptop/dxcator_home_backup_feb2020/diag-stage.qcow2,if=virtio 
>   -accel hvf 
>   -cpu host

it starts but after 4 seconds crashes with:

vmx_write_mem: mmu_gva_to_gpa ffff9ac27b23fcdc failed

Abort trap: 6

I saw other users encountered this problem here, but no answer provided.

If anybody has a clue, or suggestion for other ways to run my .qcow2 machine on Mac OS X it would be great! Thanks a lot in advance!

Answers

- jwillikers
- September 4, 2020 at 8:25 pm
- 0 votes
0
I was able to fix a similar problem using two different methods related to QEMU / KVM CPU model configuration.
Both used Homebrew’s port of QEMU, version 5.1.

Option #1: Specify the CPU Model

Try specifying the CPU model which most closely matches the host machine.
1. Determine the CPU type of the host machine.
```
$ sysctl -a | grep machdep.cpu.brand_string
machdep.cpu.brand_string: Intel(R) Core(TM) i5-4690 CPU @ 3.50GHz
```
1. Find the matching CPU model supported by QEMU.
```
$ qemu-system-x86_64 -cpu help
```
A search at ark.intel.com, for i5-4690 yields only one 3.5 GHz option, so this is my CPU.
Using the Product Collection and Code Name, this CPU must correspond to the x86 Haswell-v4 model.
1. Substitute the CPU model in the QEMU command.
```
$ qemu-system-x86_64 -cpu Haswell-v4 ...
```
Option #2: Emulate the CPU

If you still have issues, you can try emulating the CPU instead of using host passthrough.
This just requires using the default qemu64 CPU type.
You can do this like so:
```
$ qemu-system-x86_64 -cpu qemu64 ...
```
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