linux-kernel - Re: [Xen-devel] [PATCH v2 01/20] xen: Add Xen specific page definition

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: <55B209D9.1080602@citrix.com>
Date:	Fri, 24 Jul 2015 10:48:09 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Julien Grall <julien.grall@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<ian.campbell@...rix.com>, <stefano.stabellini@...citrix.com>,
	<linux-kernel@...r.kernel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v2 01/20] xen: Add Xen specific page definition

On 24/07/15 10:39, Julien Grall wrote:
> Hi David,
> 
> On 24/07/15 10:28, David Vrabel wrote:
>> On 09/07/15 21:42, Julien Grall wrote:
>>> The Xen hypercall interface is always using 4K page granularity on ARM
>>> and x86 architecture.
>>>
>>> With the incoming support of 64K page granularity for ARM64 guest, it
>>> won't be possible to re-use the Linux page definition in Xen drivers.
>>>
>>> Introduce Xen page definition helpers based on the Linux page
>>> definition. They have exactly the same name but prefixed with
>>> XEN_/xen_ prefix.
>>>
>>> Also modify page_to_pfn to use new Xen page definition.
>>>
>>> Signed-off-by: Julien Grall <julien.grall@...rix.com>
>>> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>>> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>>> Cc: David Vrabel <david.vrabel@...rix.com>
>>> ---
>>>     I'm wondering if we should drop page_to_pfn has the macro will likely
>>>     misuse when Linux is using 64KB page granularity.
>>
>> I think we want xen_gfn_to_page() and xen_page_to_gfn() and Xen
>> front/back drivers never deal with PFNs only GFNs.
> 
> What is xen_gfn_to_page and xen_page_to_gfn? Neither Linux, nor my
> series have them.

I suggesting that you introduce these.

David
--
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/