Re: [PATCH v3] powerpc/rtas: Keep MSR[RI] set when calling RTAS

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