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Re: [Qemu-devel] [PATCH 12/15] s390x: reduce TARGET_PHYS_ADDR_SPACE_BITS

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 12/15] s390x: reduce TARGET_PHYS_ADDR_SPACE_BITS to 62
Date: Sun, 26 May 2013 21:07:12 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 26/05/2013 16:14, Andreas Färber ha scritto:
> > With the next patch, the memory API will complain if the
> > TARGET_PHYS_ADDR_SPACE_BITS gets dangerously close to an
> > overflow.  s390x can handle up to 64 bit of physical address
> > space from its page tables, but we never use that much.  Just
> > decrease the value.
> > 
> > Cc: Alexander Graf <address@hidden>
> > Signed-off-by: Paolo Bonzini <address@hidden>
> Didn't Avi introduce 128-bit arithmetic into QEMU to avoid 64-bit values
> overflowing? Why are you limiting Memory API to 62-bit now?

The next patch makes a difference between artificial memory regions
(containers and aliases) which can have arbitrary placement and width,
and the final view of the address space which cannot have a full 64-bit

63 bits probably would work, but I preferred to be safe since 62 is the
largest used by other targets.

It should be fixable, but if it is not a problem I wouldn't worry much
about it.


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