From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Laurent Dufour <ldufour@linux.ibm.com>,
mpe@ellerman.id.au
Cc: Nicholas Piggin <npiggin@gmail.com>,
Fabiano Rosas <farosas@linux.ibm.com>,
stable@vger.kernel.org
Subject: Re: [PATCH v3] powerpc/rtas: Keep MSR[RI] set when calling RTAS
Date: Sun, 15 May 2022 20:29:05 +1000 [thread overview]
Message-ID: <165261054578.1047019.8022784676618367625.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20220504101244.12107-1-ldufour@linux.ibm.com>
On Wed, 4 May 2022 12:12:44 +0200, Laurent Dufour wrote:
> RTAS runs in real mode (MSR[DR] and MSR[IR] unset) and in 32bits
> big endian mode (MSR[SF,LE] unset).
>
> The change in MSR is done in enter_rtas() in a relatively complex way,
> since the MSR value could be hardcoded.
>
> Furthermore, a panic has been reported when hitting the watchdog interrupt
> while running in RTAS, this leads to the following stack trace:
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/rtas: Keep MSR[RI] set when calling RTAS
https://git.kernel.org/powerpc/c/b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5
cheers
WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Laurent Dufour <ldufour@linux.ibm.com>,
mpe@ellerman.id.au
Cc: stable@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
Fabiano Rosas <farosas@linux.ibm.com>
Subject: Re: [PATCH v3] powerpc/rtas: Keep MSR[RI] set when calling RTAS
Date: Sun, 15 May 2022 20:29:05 +1000 [thread overview]
Message-ID: <165261054578.1047019.8022784676618367625.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20220504101244.12107-1-ldufour@linux.ibm.com>
On Wed, 4 May 2022 12:12:44 +0200, Laurent Dufour wrote:
> RTAS runs in real mode (MSR[DR] and MSR[IR] unset) and in 32bits
> big endian mode (MSR[SF,LE] unset).
>
> The change in MSR is done in enter_rtas() in a relatively complex way,
> since the MSR value could be hardcoded.
>
> Furthermore, a panic has been reported when hitting the watchdog interrupt
> while running in RTAS, this leads to the following stack trace:
>
> [...]
Applied to powerpc/next.
[1/1] powerpc/rtas: Keep MSR[RI] set when calling RTAS
https://git.kernel.org/powerpc/c/b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5
cheers
next prev parent reply other threads:[~2022-05-15 10:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-04 10:12 [PATCH v3] powerpc/rtas: Keep MSR[RI] set when calling RTAS Laurent Dufour
2022-05-04 10:12 ` Laurent Dufour
2022-05-15 10:29 ` Michael Ellerman [this message]
2022-05-15 10:29 ` Michael Ellerman
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