linux-kernel - Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4C36B494.6060801@goop.org>
Date:	Thu, 08 Jul 2010 22:33:08 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Simon Horman <horms@...ge.net.au>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Matthew Wilcox <matthew@....cx>, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, macro@...ux-mips.org,
	kamezawa.hiroyu@...fujitsu.com, eike-kernel@...tec.de
Subject: Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

On 07/08/2010 09:24 PM, Simon Horman wrote:
>> I think it would be a pretty large change.  From the Xen's perspective,
>> any machine even approximately approaching the 2^44 limit will be
>> capable of running Xen guests in hvm mode, so PV isn't really a concern.
>>     
> Hi Jeremy,
>
> Is the implication of that statement that HVM is preferred where
> supported by HW?
>   

I wouldn't go that far; the PV vs HVM choice is pretty complex, and
depends on what your workload is and what hardware you have available. 
All I meant was what I said: that if you're running on a machine with a
large amount of memory, then you should run your 32-bit domains as HVM
rather than PV.  Though Xen could easily keep domains limited to memory
that they can actually use (it already does this, in fact).

    J
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/