Am 10.03.23 um 14:31 schrieb Alexander Gordeev:
On Fri, Mar 10, 2023 at 02:20:32PM +0100, Christian Borntraeger wrote:
Are you sure? Quickly checked ppc64, x86 and arm64 - they do not
seem adhere virt_to_phys(0) == 0, nor the VR kernel (so far).
Isnt that the prefix page? I think we did say that the prefix page must be 0 in virt and phys otherwise we will have performance issues due to cache synonyms.
As far as I am concerned we should keep virt_to_phys() semantics in
sync with other archs and one should not rely on s390 implementation-
specifics. Please, see also my other reply to Nico in v2.
I agree with that.
I am just saying that we should never have virtual/real for prefix != 0 on current machines.
