From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: [PATCH v3] x86/arm/mm: use gfn instead of pfn in
 p2m_get_mem_access/p2m_set_mem_access
Date: Fri, 26 Jun 2015 17:54:26 +0200
Message-ID: <558D75B2.4090405@citrix.com>
References: <1435331830-7704-1-git-send-email-vkuznets@redhat.com>
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To: Vitaly Kuznetsov <vkuznets@redhat.com>, xen-devel@lists.xen.org
Cc: Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Razvan Cojocaru <rcojocaru@bitdefender.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Tim Deegan <tim@xen.org>, Stefano Stabellini <stefano.stabellini@citrix.com>, Jan Beulich <jbeulich@suse.com>, Tamas K Lengyel <tlengyel@novetta.com>
List-Id: xen-devel@lists.xenproject.org

Hi,

On 26/06/2015 17:17, Vitaly Kuznetsov wrote:
> 'pfn' and 'start_pfn' are ambiguous, both these functions expect GFNs as input.
>
> On x86 the interface of p2m_set_mem_access() in p2m.c doesn't match the
> declaration in p2m-common.h as 'pfn' is being used instead of 'start_pfn'.
>
> On ARM both p2m_set_mem_access and p2m_get_mem_access interfaces don't match
> declarations from p2m-common.h: p2m_set_mem_access uses 'pfn' instead of
> 'start_pfn' and p2m_get_mem_access uses 'gpfn' instead of 'pfn'.
>
> There is also an issue in p2m_get_mem_access on x86: 'gfn' parameter passed to
> gfn_lock/gfn_unlock is not defined. This code compiles only because of a
> coincidence: gfn_lock/gfn_unlock are currently macros which don't use their
> second argument.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> Changes since v2:
> - Instead of adding start_ prefix on ARM remove it on x86 [Jan Beulich,
>    Ian Campbell, Razvan Cojocaru]
>
> Changes since v1:
> - This patch is a successor of '[PATCH] x86/mm: use existing 'pfn' in
>    p2m_get_mem_access', instead of fixing gfn_lock/gfn_unlock arguments we do
>    s/pfn/gfn/g for both p2m_get_mem_access/p2m_set_mem_access [Andrew Cooper,
>    Jan Beulich]
>
> P.S.
> - The patch was compile-tested on x86 only.

compiled-tested on ARM is not difficult, you just need to install a ARM 
cross-compiler and build it [1]. Most of distributions have a package 
for it.

I have build-tested and the patch looks good for to me. For the ARM part:

Reviewed-by: Julien Grall <julien.grall@citrix.com>

Regards,

[1] 
http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions#Cross_Compiling

-- 
Julien Grall