From: Avi Kivity <avi@redhat.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC128 3/2] Adjust system and pci address spaces to full 64-bit
Date: Mon, 17 Oct 2011 12:38:04 +0200 [thread overview]
Message-ID: <4E9C058C.6060307@redhat.com> (raw)
In-Reply-To: <20111017053348.GC30114@truffala.fritz.box>
On 10/17/2011 07:33 AM, David Gibson wrote:
> On Sun, Oct 16, 2011 at 05:29:07PM +0200, Avi Kivity wrote:
> > Now that the memory API supports full 64-bit buses, adjust the relevant
> > callers to take advantage of it.
>
> Note that this doesn't, strictly speaking doesn't give you full 64-bit
> coverage, since the range covered is 2^64-1 bytes rather than 2^64
> bytes. Cases where that will matter would be very rare, of course.
>
An undocumented and indeed unmentioned feature of patch 2 is that
UINT64_MAX sizes are expanded to UINT64_MAX+1. I did that to avoid
introducing memory_region_init_128() (or perhaps
memory_region_init_2_64() that doesn't take a size argument). That
removes the ability to create container regions that span exactly
UINT64_MAX bytes. It is strange in a patchset that tries to makes
things more regular, I admit.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2011-10-17 10:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-16 11:24 [Qemu-devel] [RFC128 0/2] 128-bit arithmetic for the memory API Avi Kivity
2011-10-16 11:24 ` [Qemu-devel] [RFC128 1/2] Add support for 128-bit arithmetic Avi Kivity
2011-10-16 11:24 ` [Qemu-devel] [RFC128 2/2] memory: use 128-bit integers for sizes and intermediates Avi Kivity
2011-10-16 15:29 ` [Qemu-devel] [RFC128 3/2] Adjust system and pci address spaces to full 64-bit Avi Kivity
2011-10-17 5:33 ` David Gibson
2011-10-17 10:38 ` Avi Kivity [this message]
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