From: Avi Kivity <avi@redhat.com>
To: Richard Henderson <rth@twiddle.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [PATCH] memory: use signed arithmetic
Date: Wed, 03 Aug 2011 11:26:42 +0300 [thread overview]
Message-ID: <4E390642.5050402@redhat.com> (raw)
In-Reply-To: <4E3876FD.4030409@twiddle.net>
On 08/03/2011 01:15 AM, Richard Henderson wrote:
> 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.
Ben, can you confirm that pseries physical addresses are 63 bits wide or
smaller?
IIRC zseries has no mmio, and Zettabyte machines are still rare.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-08-03 8:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-02 20:50 [PATCH] memory: use signed arithmetic Avi Kivity
2011-08-02 21:15 ` [Qemu-devel] " malc
2011-08-02 21:21 ` Avi Kivity
2011-08-02 21:59 ` Richard Henderson
2011-08-02 22:06 ` Avi Kivity
2011-08-02 22:15 ` Richard Henderson
2011-08-03 8:26 ` Avi Kivity [this message]
2011-08-03 11:48 ` Benjamin Herrenschmidt
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