On Tue, Jul 09, 2024 at 11:03:10PM +1000, Michael Ellerman wrote:
> Michal Suchánek writes:
> > Hello,
> >
> > On Tue, Jun 25, 2024 at 11:40:47PM +1000, Nicholas Piggin wrote:
> >> kexec on pseries disables AIL (reloc_on_exc), required for scv
> >> instruction support, before other CPUs have been
Michal Suchánek writes:
> Hello,
>
> On Tue, Jun 25, 2024 at 11:40:47PM +1000, Nicholas Piggin wrote:
>> kexec on pseries disables AIL (reloc_on_exc), required for scv
>> instruction support, before other CPUs have been shut down. This means
>> they can execute scv instructions after AIL is disabl
Hello,
On Tue, Jun 25, 2024 at 11:40:47PM +1000, Nicholas Piggin wrote:
> kexec on pseries disables AIL (reloc_on_exc), required for scv
> instruction support, before other CPUs have been shut down. This means
> they can execute scv instructions after AIL is disabled, which causes an
> interrupt a
On Tue, 25 Jun 2024 23:40:47 +1000, Nicholas Piggin wrote:
> kexec on pseries disables AIL (reloc_on_exc), required for scv
> instruction support, before other CPUs have been shut down. This means
> they can execute scv instructions after AIL is disabled, which causes an
> interrupt at an unexpecte
On 26/06/24 15:10, Gautam Menghani wrote:
Without this patch, we had an issue where if we have some cpus disabled
in the system and we try to do a 2 stage kexec as follows:
kexec -l vmlinux
kexec -e
we would hit the following Oops
[ 2598.923098] kernel BUG at arch/powerpc/kernel/except
Sourabh Jain writes:
> On 26/06/24 14:57, Michael Ellerman wrote:
>> Nicholas Piggin writes:
>>> kexec on pseries disables AIL (reloc_on_exc), required for scv
>>> instruction support, before other CPUs have been shut down. This means
>>> they can execute scv instructions after AIL is disabled, w
Hello Michael,
On 26/06/24 14:57, Michael Ellerman wrote:
Nicholas Piggin writes:
kexec on pseries disables AIL (reloc_on_exc), required for scv
instruction support, before other CPUs have been shut down. This means
they can execute scv instructions after AIL is disabled, which causes an
inter
Without this patch, we had an issue where if we have some cpus disabled
in the system and we try to do a 2 stage kexec as follows:
kexec -l vmlinux
kexec -e
we would hit the following Oops
[ 2598.923098] kernel BUG at arch/powerpc/kernel/exceptions-64s.S:501!
[ 2598.923103] Oops: Exception
Nicholas Piggin writes:
> kexec on pseries disables AIL (reloc_on_exc), required for scv
> instruction support, before other CPUs have been shut down. This means
> they can execute scv instructions after AIL is disabled, which causes an
> interrupt at an unexpected entry location that crashes the
kexec on pseries disables AIL (reloc_on_exc), required for scv
instruction support, before other CPUs have been shut down. This means
they can execute scv instructions after AIL is disabled, which causes an
interrupt at an unexpected entry location that crashes the kernel.
Change the kexec sequenc
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