From: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
To: "Cédric Le Goater" <clg@kaod.org>,
"Bruno Larsen (billionai)" <bruno.larsen@eldorado.org.br>,
qemu-devel@nongnu.org
Cc: farosas@linux.ibm.com, richard.henderson@linaro.org,
luis.pires@eldorado.org.br, Greg Kurz <groug@kaod.org>,
lucas.araujo@eldorado.org.br, fernando.valle@eldorado.org.br,
qemu-ppc@nongnu.org, matheus.ferst@eldorado.org.br,
david@gibson.dropbear.id.au
Subject: Re: [PATCH v2 1/2] target/ppc: fix address translation bug for radix mmus
Date: Tue, 15 Jun 2021 16:14:11 +0200 [thread overview]
Message-ID: <e1b779f0-6120-4efe-ad6f-6807888df3bd@amsat.org> (raw)
In-Reply-To: <8805c9ed-8ca1-540a-5fcb-81f146c76afb@kaod.org>
On 6/15/21 3:57 PM, Cédric Le Goater wrote:
> On 6/14/21 9:16 PM, Bruno Larsen (billionai) wrote:
>> Based-on: <20210518201146.794854-1-richard.henderson@linaro.org>
>>
>> This commit attempts to fix the first bug mentioned by Richard Henderson in
>> https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg06247.html
>>
>> To sumarize the bug here, when radix-style mmus are translating an
>> address, they might need to call a second level of translation, with
>> hypvervisor priviledges. However, the way it was being done up until
>> this point meant that the second level translation had the same
>> priviledges as the first level. This would only happen when a TCG guest
>> was emulating KVM, which is why it hasn't been discovered yet.
>
> What do you mean ? The QEMU PowerNV machine emulates baremetal and
> can run KVM pseries guests.
>
> It has some issues under load but not related to memory translation.
> This patch is certainly improving the model and it is worth testing
> but this version does not apply on ppc-6.1.
Unfortunately this series misses a cover letter.
The base series is mentioned in the first patch:
Based-on: <20210518201146.794854-1-richard.henderson@linaro.org>
next prev parent reply other threads:[~2021-06-15 14:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 19:16 [PATCH v2 1/2] target/ppc: fix address translation bug for radix mmus Bruno Larsen (billionai)
2021-06-14 19:16 ` [RFC PATCH v2 2/2] target/ppc: make gdb able to translate priviledged addresses Bruno Larsen (billionai)
2021-06-14 19:37 ` Philippe Mathieu-Daudé
2021-06-15 1:41 ` David Gibson
2021-06-15 12:12 ` Bruno Piazera Larsen
2021-06-14 21:25 ` Fabiano Rosas
2021-06-15 11:59 ` Bruno Piazera Larsen
2021-06-14 22:37 ` Richard Henderson
2021-06-15 11:32 ` Bruno Piazera Larsen
2021-06-15 20:00 ` Richard Henderson
2021-06-15 21:37 ` Fabiano Rosas
2021-06-16 12:07 ` Bruno Piazera Larsen
2021-06-16 6:18 ` David Gibson
2021-06-14 19:29 ` [PATCH v2 1/2] target/ppc: fix address translation bug for radix mmus Greg Kurz
2021-06-14 21:04 ` Fabiano Rosas
2021-06-15 1:18 ` David Gibson
2021-06-15 1:41 ` David Gibson
2021-06-15 3:20 ` Richard Henderson
2021-06-15 12:25 ` Bruno Piazera Larsen
2021-06-16 6:16 ` David Gibson
2021-06-15 13:57 ` Cédric Le Goater
2021-06-15 14:14 ` Philippe Mathieu-Daudé [this message]
2021-06-15 14:57 ` Bruno Piazera Larsen
2021-06-15 15:57 ` Cédric Le Goater
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