[PATCH umr] Skip ahead if PDE entry is actually a PTE entry. (v2)
ckoenig.leichtzumerken at gmail.com
Mon Nov 6 18:34:39 UTC 2017
Am 06.11.2017 um 19:28 schrieb Tom St Denis:
> On 06/11/17 05:01 AM, Christian König wrote:
>> Am 04.11.2017 um 18:15 schrieb Tom St Denis:
>>> Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
>> Still not perfect, but good enough for now. Patch is Tested-by:
>> Christian König <christian.koenig at amd.com>.
>> I think you need to rework the VM walking a bit, cause we need to
>> support the T bit as well in the future and your code make a few
>> assumptions which doesn't allow that.
> Doesn't the T bit imply V=0 which means the page isn't backed by
> memory. Not much umr could do about that other than to print out the
> T bit.
No, the T bit means translate further. In other words it is the counter
part of the P bit and means that a PTE should be handled as a PDE.
But for this to have meaning you also need to handle the fragment size
as well (Now I have you totally confused, haven't I? :).
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