On 20/01/15 17:05, Roger Pau Monne wrote:
> Prevent Dom0 from accessing HPET MMIO region by adding the HPET mfn to the
> list of read-only memory regions.
>
> Signed-off-by: Roger Pau Monné <roger....@citrix.com>
> Cc: Jan Beulich <jbeul...@suse.com>
> Cc: Andrew Cooper <andrew.coop...@citrix.com>

Please introduce a command line parameter to control this, but
defaulting to read-only is perfectly fine.

I can well imagine that there are some bits of firmware around which
reuse the other 3/4 of the HPET page, and users with such hardware will
need a workaround.  Perhaps a boolean parameter named "ro_hpet" ?

~Andrew


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