lkml.org 
[lkml]   [2013]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] xen/arm: pfn_to_mfn and mfn_to_pfn return the argument if nothing is in the p2m
Date
Some common Xen drivers, like balloon.c, call pfn_to_mfn and mfn_to_pfn
even for autotranslate guests, expecting the argument back.
The following commit broke these drivers by changing the behavior of
pfn_to_mfn and mfn_to_pfn:

commit 4a19138c6505e224d9f4cc2fe9ada9188d7100ea
Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Thu Oct 17 16:22:27 2013 +0000

arm/xen,arm64/xen: introduce p2m

They now return INVALID_P2M_ENTRY if Linux doesn't actually know what is
the mfn backing a pfn or what is the pfn corresponding to an mfn.
Fix the regression by switching to the old behavior.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/arm/include/asm/xen/page.h | 10 ++--------
1 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 5d0e4c5..f891925 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -46,10 +46,7 @@ static inline unsigned long pfn_to_mfn(unsigned long pfn)
return mfn;
}

- if (xen_initial_domain())
- return pfn;
- else
- return INVALID_P2M_ENTRY;
+ return pfn;
}

static inline unsigned long mfn_to_pfn(unsigned long mfn)
@@ -62,10 +59,7 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn)
return pfn;
}

- if (xen_initial_domain())
- return mfn;
- else
- return INVALID_P2M_ENTRY;
+ return mfn;
}

#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
--
1.7.2.5


\
 
 \ /
  Last update: 2013-11-11 14:21    [W:0.031 / U:0.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site