From: Richard Henderson <rth@twiddle.net>
To: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [PATCH] memory: use signed arithmetic
Date: Tue, 02 Aug 2011 15:15:25 -0700 [thread overview]
Message-ID: <4E3876FD.4030409@twiddle.net> (raw)
In-Reply-To: <4E3874F0.3040106@redhat.com>
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~
WARNING: multiple messages have this Message-ID (diff)
From: Richard Henderson <rth@twiddle.net>
To: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] [PATCH] memory: use signed arithmetic
Date: Tue, 02 Aug 2011 15:15:25 -0700 [thread overview]
Message-ID: <4E3876FD.4030409@twiddle.net> (raw)
In-Reply-To: <4E3874F0.3040106@redhat.com>
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~
next prev parent reply other threads:[~2011-08-02 22:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-02 20:50 [PATCH] memory: use signed arithmetic Avi Kivity
2011-08-02 20:50 ` [Qemu-devel] " Avi Kivity
2011-08-02 21:15 ` malc
2011-08-02 21:15 ` malc
2011-08-02 21:21 ` Avi Kivity
2011-08-02 21:21 ` Avi Kivity
2011-08-02 21:59 ` Richard Henderson
2011-08-02 21:59 ` [Qemu-devel] " Richard Henderson
2011-08-02 22:06 ` Avi Kivity
2011-08-02 22:06 ` [Qemu-devel] " Avi Kivity
2011-08-02 22:15 ` Richard Henderson [this message]
2011-08-02 22:15 ` Richard Henderson
2011-08-03 8:26 ` Avi Kivity
2011-08-03 8:26 ` [Qemu-devel] " Avi Kivity
2011-08-03 11:48 ` Benjamin Herrenschmidt
2011-08-03 11:48 ` [Qemu-devel] " Benjamin Herrenschmidt
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