Re: [PATCH v2 1/2] target/ppc: fix address translation bug for radix mmus

[Philippe Mathieu-Daudé]

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>