Re: [Xen-devel] [PATCH for-4.12 v3 3/8] amd/npt/shadow: replace assert that prevents creating 2M/1G MMIO entries

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.02.19 at 15:18, <roger.pau@xxxxxxxxxx> wrote:
> The assert was originally added to make sure that higher order
> regions (> PAGE_ORDER_4K) could not be used to bypass the
> mmio_ro_ranges check performed by p2m_type_to_flags.
> 
> This however is already checked in set_mmio_p2m_entry, which makes
> sure that higher order mappings don't overlap with mmio_ro_ranges,
> thus allowing the creation of high order MMIO mappings safely.
> 
> Replace the assert to allow 2M/1G entries to be created for MMIO
> regions and add some extra asserts as a replacement to make sure
> there's no overlapping with MMIO read-only ranges.
> 
> Note that 1G MMIO entries will not be created unless mmio_order is
> changed to allow it.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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