Re: [Xen-devel] [PATCH v1 for-4.6 2/2] xen: prevent access to HPET from Dom0

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

Hello,

El 18/12/14 a les 19.51, Andrew Cooper ha escrit:
> On 18/12/14 18:27, Roger Pau Monne wrote:
>> Prevent Dom0 from accessing HPET MMIO region by adding it to the list of
>> denied memory regions.
>>
>> Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
>> Cc: Jan Beulich <jbeulich@xxxxxxxx>
>> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 
> Apologies that this reply is split between patch 0 and 2 - I replied to
> your cover letter before reading this patch.
> 
> Denying access is only valid if acpi_table_hpet.flags & 
> ACPI_HPET_PAGE_PROTECT4 is true.

Thanks, if ACPI_HPET_PAGE_PROTECT4 is set then we can prevent access to
the full page and if ACPI_HPET_PAGE_PROTECT64 is set we can prevent
access to this page and the adjacent 60KB (15 pages). Will send an
updated version.

Roger.


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