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Re: [Qemu-devel] [PATCH] memory: use signed arithmetic
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH] memory: use signed arithmetic |
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Date: |
Tue, 02 Aug 2011 15:15:25 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20110707 Thunderbird/5.0 |
On 08/02/2011 03:06 PM, Avi Kivity wrote:
> I don't think there's any cpu which has a real 64-bit physical
> address space? Don't they all truncate it?
I don't know. You're right that x86_64 does, at 48 bits.
The alpha system I'm trying to emulate does, at 50 bits.
I guess if IBM agrees wrt p-series and z-series emulation, then
I'd be ok, so long as you add a comment above that structure that
says no existing hw implementation actually uses 63 address bits.
r~