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Re: [PATCH v4] target/ppc: fix Hash64 MMU update of PTE bit R


From: Cédric Le Goater
Subject: Re: [PATCH v4] target/ppc: fix Hash64 MMU update of PTE bit R
Date: Tue, 30 Nov 2021 09:44:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0

On 11/30/21 01:30, David Gibson wrote:
On Mon, Nov 29, 2021 at 03:57:51PM -0300, Leandro Lupori wrote:
When updating the R bit of a PTE, the Hash64 MMU was using a wrong byte
offset, causing the first byte of the adjacent PTE to be corrupted.
This caused a panic when booting FreeBSD, using the Hash MMU.

Fixes: a2dd4e83e76b ("ppc/hash64: Rework R and C bit updates")
Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

Sorry, I didn't wait for your Rb because the patch was a good candidate
for -rc3. It is merged now.

Thanks for your patience with our nitpicking :).

Yes,

Here is another QEMU bug found by FreeBSD :
427ef2ee-6871-0d27-f485-90ad142f6266@kaod.org/">https://lore.kernel.org/qemu-devel/427ef2ee-6871-0d27-f485-90ad142f6266@kaod.org/

It would be interesting to boot directly the PowerNV machine from a
FreeBSB kernel and a minimum inirtd without using the skiroot images
and an iso. Are images available ?

Thanks.

C.



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