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List:       kvm-ppc
Subject:    Powermac G5 KVM Qemu
From:       Dan Whitehouse <drw () dim-sum ! org>
Date:       2023-01-24 9:12:41
Message-ID: 5F435810-D601-47E3-A2C2-377CF9705215 () dim-sum ! org
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Hi,
I have a Powermac G5 (dual core) running: Linux powermac-g5 6.0.0-6-powerpc64 #1 SMP \
Debian 6.0.12-1 (2022-12-09) ppc64, from Debian Ports.

I have been trying to get Qemu working with KVM for some time with no luck. Any \
attempt to do so causes my disk to thrash and I see:

[ 2718.262923] Couldn't emulate instruction 0x00000000 (op 0 xop 0)
[ 2718.274439] kvmppc_exit_pr_progint: emulation at 100 failed (00000000)

filling my dmesg. 

This was briefly discussed in a thread titled "Re: [PATCH 2/9] target/ppc: add errp \
to kvmppc_read_int_cpu_dt()" on the Qemu-PPC mailing list from July 6th of last year, \
but there doesn't appear to have been much resolution. It appears that KVM works on \
G4 processors on reasonably recent kernels: (Linux macmini 5.1.0-rc2+ #56 Wed Mar 27 \
00:38:43 GMT 2019 ppc GNU/Linux) and there is evidence from the Macrumors forum that \
it was working on G5 hardware back in the days of: Linux debian 4.19.0-4-powerpc64 #1 \
SMP Debian 4.19.28-2 (2019-03-15) ppc64.

I'm not a developer so at this stage I'm uncertain whether the issue lies with Qemu \
or the Kernel, but any help with this would be appreciated.

Thanks,

Dan


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