[PATCH] powerpc/kexec: Fix kexec/kdump in P9 guest kernels

[Balbir Singh]

On Fri, Nov 24, 2017 at 2:51 PM, Michael Ellerman <mpe at ellerman.id.au> wrote:
> The code that cleans up the IAMR/AMOR before kexec'ing failed to
> remember that when we're running as a guest AMOR is not writable, it's
> hypervisor privileged.
>
> They symptom is that the kexec stops before entering purgatory and
> nothing else is seen on the console. If you examine the state of the
> system all threads will be in the 0x700 program check handler.
>
> Fix it by making the write to AMOR dependent on HV mode.
>
> Fixes: 1e2a516e89fc ("powerpc/kexec: Fix radix to hash kexec due to IAMR/AMOR")
> Cc: stable at vger.kernel.org # v4.10+
> Reported-by: Yilin Zhang <yilzhang at redhat.com>
> Debugged-by: David Gibson <david at gibson.dropbear.id.au>
> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> ---

Acked-by: Balbir Singh <bsingharora at gmail.com>