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Re: [PATCH] hw/acpi: Set memory regions to native endian as a work aroun

From: Paolo Bonzini
Subject: Re: [PATCH] hw/acpi: Set memory regions to native endian as a work around
Date: Mon, 8 Nov 2021 16:04:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

On 11/8/21 15:30, Paolo Bonzini wrote:
On 11/8/21 14:05, BALATON Zoltan wrote:
When using ACPI on big endian machine (such as ppc/pegasos2 which has
a VT8231 south bridge with ACPI) writes to ACPI registers come out
byte swapped. This may be caused by a bug in memory subsystem but
until that is fixed setting the ACPI memory regions to native endian
makes it usable for big endian machines. This fixes ACPI shutdown with
pegasos2 when using the board firmware for now.
This could be reverted when the memory layer is fixed.

What is the path to the swapped writes?  Even just a backtrace might be enough to understand what's going on, and especially where the bug is.

Ok, Michael pointed me at https://lore.kernel.org/all/20211011080528-mutt-send-email-mst@kernel.org/.


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