Re: [Xen-devel] [RFC PATCH 4/4] arm/mem_access: Add software guest-page-table walk

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

Hi Razvan,

Sure thing. Thanks anyway :)

Cheers,

~Sergej


On 05/01/2017 04:38 PM, Razvan Cojocaru wrote:
> On 04/30/2017 10:48 PM, Sergej Proskurin wrote:
>> The function p2m_mem_access_check_and_get_page in mem_access.c
>> translates a gva to an ipa by means of the hardware functionality
>> implemented in the function gva_to_ipa. If mem_access is active,
>> hardware-based gva to ipa translation might fail, as gva_to_ipa uses the
>> guest's translation tables, access to which might be restricted by the
>> active VTTBR. To address this issue, we perform the gva to ipa
>> translation in software.
>>
>> Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
>> ---
>> Cc: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
>> Cc: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
>> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> Cc: Julien Grall <julien.grall@xxxxxxx>
>> ---
>>  xen/arch/arm/mem_access.c | 140 
>> +++++++++++++++++++++++++++++++++++++++++++++-
>>  1 file changed, 139 insertions(+), 1 deletion(-)
> My ARM knowledge is scant to say the least, and I have no way to test
> this code, so I'll leave it to Tamas who has done some ARM work in the
> past. In any case - to state the obvious - the main acks here I believe
> are Julien and Stefano.
>
>
> Thanks,
> Razvan

-- 
Sergej Proskurin, M.Sc.
Wissenschaftlicher Mitarbeiter

Technische Universität München
Fakultät für Informatik
Lehrstuhl für Sicherheit in der Informatik

Boltzmannstraße 3
85748 Garching (bei München)

Tel. +49 (0)89 289-18592
Fax +49 (0)89 289-18579

proskurin@xxxxxxxxxxxxx
www.sec.in.tum.de


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