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Regression in q35 avocado tests due to fix for misaligned IO access
Description of problem:
Generally I'm seeing intermittent hangs, somewhere after the clock initialisation.
```
[ 4.137020] ALSA device list:
[ 4.137861] No soundcards found.
[ 4.634128] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3
[ 24.085574] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 24.085712] rcu: 0-...!: (0 ticks this GP) idle=4d18/0/0x0 softirq=54/54 fqs=0 (false positive?)
[ 24.085712] (detected by 1, t=21004 jiffies, g=-1003, q=2151 ncpus=2)
[ 24.085712] Sending NMI from CPU 1 to CPUs 0:
[ 4.647507] NMI backtrace for cpu 0
[ 4.647507] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.0.11 #5
[ 4.647507] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
[ 4.647507] RIP: 0010:amd_e400_idle+0x39/0x40
[ 4.647507] Code: 00 e8 fb ab 0d 00 eb 07 0f 00 2d c2 7d 1d 01 fb f4 fa 31 ff e8 e8 ab 0d 00 fb c3 cc cc cc cc eb 07 0f 00 2d a9 7d 1d 01 fb f4 <c3> cc cc cc cc 66 90 bf
01 00 00 00 e8 a6 e4 06 00 65 48 8b 04 25
```
In avocado the hang generally times out and the test fails.
Steps to reproduce:
See above command line. It's racy.
Additional information:
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