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Re: [PATCH] target/ppc: Fix regression in Radix MMU


From: Víctor Colombo
Subject: Re: [PATCH] target/ppc: Fix regression in Radix MMU
Date: Fri, 28 Oct 2022 15:53:42 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2

On 28/10/2022 15:36, Leandro Lupori wrote:
Commit 47e83d9107 ended up unintentionally changing the control flow
of ppc_radix64_process_scoped_xlate(). When guest_visible is false,
it must not raise an exception, even if the radix configuration is
not valid.

This regression prevented Linux boot in a nested environment with
L1 using TCG and emulating KVM (cap-nested-hv=on) and L2 using
KVM. L2 would hang on Linux's futex_init(), when it tested how a
futex_atomic_cmpxchg_inatomic() handled a fault, because L1 would
start a loop of trying to perform partition scoped translations
and raising exceptions.

Fixes: 47e83d9107 ("target/ppc: Improve Radix xlate level validation")
Reported-by: Victor Colombo <victor.colombo@eldorado.org.br>
Signed-off-by: Leandro Lupori <leandro.lupori@eldorado.org.br>

It now reaches the login screen on L2

Tested-by: Víctor Colombo <victor.colombo@eldorado.org.br>

--
Víctor Cora Colombo
Instituto de Pesquisas ELDORADO
Aviso Legal - Disclaimer <https://www.eldorado.org.br/disclaimer.html>


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