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

From: Leandro Lupori
Subject: Re: [PATCH] target/ppc: fix Hash64 MMU update of PTE bit R
Date: Wed, 24 Nov 2021 18:12:11 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0

On 24/11/2021 16:52, Cédric Le Goater wrote:
It can be reproduced by trying to boot this iso: https://download.freebsd.org/ftp/snapshots/powerpc/powerpc64/ISO-IMAGES/14.0/FreeBSD-14.0-CURRENT-powerpc-powerpc64-20211028-4827bf76bce-250301-disc1.iso.xz

It is easier to reproduce it using power8/powernv8.

power8 only has Hash MMU. I understand that FreeBSD also supports power9
processor. with radix ? and XIVE ?

Right, FreeBSD supports POWER9 with Radix, that is now the default MMU choice. To select Hash MMU, you need to pass radix_mmu=0 to kernel command line.
FreeBSD supports XIVE too, but only for PowerNV.

BTW, when trying to boot with Radix instead of Hash, a different issue happens. Boot goes further, but then programs start to get SIGILL or SIGSEGV.




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