Re: Making MAX_PHYS_ADDRESS_BITS configurable
From: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Date: Fri, 24 May 2019 12:24:53 +0200
> On the other hand, arm64 currently allows the virtual address size
> to be configurable, currently defaulting to 48 bits [2, 3]. I was
> therefore wondering whether we could make MAX_PHYS_ADDRESS_BITS [4]
> configurable as well to be able to support these JITs on
> Debian/sparc64 for the foreseeable future by limiting the virtual
> address space to 47 or 48 bits.
You can't just do this.
It is possible that all physical memory is mapped to the top of the
mappable physical address range, therefore we really need to use the
full maximum setting supported by the CPU.
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