On 20/12/24 13:08 Christian Zigotzky wrote:

On 18/12/24 15:41, Christian Zigotzky wrote:

quoted

On 18/12/24 12:10, Christian Zigotzky wrote:

quoted

Hello,

The KVM HV host module doesn't work anymore since the PowerPC 
updates 6.13-1 [1] and PowerPC MM updates [2].

We have tested it with our FSL P5020/P5040 boards [3].

The guest kernel doesn't boot. There is no output via the serial 
connection and no output via the graphics card. (QEMU)

It boots without the PowerPC updates 6.13-1 [1] and PowerPC MM 
updates [2].

Is the problem already known? Is there already a solution? I have 
seen many Book3S KVM HV updates. Have you perhaps forgotten Book3E?

Thanks,
Christian

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=42d9e8b7ccddee75989283cf7477305cfe3776ff
[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c00ff742bf5caf85f60e1c73999f99376fb865d
[3] http://wiki.amiga.org/index.php?title=X5000

I tried to bisect but without success. Link: 
https://github.com/chzigotzky/kernels/issues/4#issuecomment-2551460323

-- Christian

It seems, that the PowerPC updates 6.13-1 aren't responsible for this 
issue. I had to test the PowerPC updates 6.13-1 during the bisect. [1]

Bisecting: 428 revisions left to test after this (roughly 9 steps)
[42d9e8b7ccddee75989283cf7477305cfe3776ff] Merge tag 'powerpc-6.13-1' 
of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Result:  git bisect good

There aren't any changes in the PowerPC MM updates [2].

Do you have another idea? I like KVM HV on my FSL P5040 system and use 
it very often for testing. However, KVM HV is hardly used by our 
users, so we could remove it from our kernels if it were not fixed. It 
would save space to remove it.

-- Christian

[1] https://github.com/chzigotzky/kernels/issues/4
[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5c00ff742bf5caf85f60e1c73999f99376fb865d

Maybe the kvm updates [1] from Paolo Bonzini are responsible for this issue.

+ Paolo Bonzini

I have found some changes in the e500_mmu_host.c file 
(a/arch/powerpc/kvm/e500_mmu_host.c) in the kvm updates [1].

-- Christian

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f16d5e6f220661f73b36a4be1b21575651d8833