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* [Lguest/x86]: Clash with ioremap_nocache() + _PAGE_PWT
@ 2008-02-06 23:21 Ahmed S. Darwish
  2008-02-06 23:59 ` Ingo Molnar
  0 siblings, 1 reply; 5+ messages in thread
From: Ahmed S. Darwish @ 2008-02-06 23:21 UTC (permalink / raw)
  To: Rusty Russel, Suresh Siddha, Ingo Molnar, Thomas Gleixner
  Cc: lguest, linux-kernel

Hi all,

Beginning from commit 4138cc3418f5, ioremap_nocache() sets the _PAGE_PWT
flag. 

Lguest doesn't accept a guest pte with a _PWT flag and reports a
"bad page table entry" in that case. 

I've removed check from lguest code and everything worked fine. 
Is this safe from the Lguest side ?

Mentioned commit [*]:

commit 4138cc3418f5eaa7524ff8e927102863f1ba0ea5
Author: Siddha, Suresh B <suresh.b.siddha@intel.com>
Date:   Wed Jan 30 13:33:43 2008 +0100

    x86: set strong uncacheable where UC is really desired
    
    Also use _PAGE_PWT for all the mappings which need uncache mapping.
    Instead of existing PAT2 which is UC- (and can be overwritten by MTRRs),
    we now use PAT3 which is strong uncacheable.
    
    This makes it consistent with pgprot_noncached()

diff --git a/arch/x86/mm/ioremap_32.c b/arch/x86/mm/ioremap_32.c
index 0b27831..ef0f6a4 100644
--- a/arch/x86/mm/ioremap_32.c
+++ b/arch/x86/mm/ioremap_32.c
@@ -119,7 +119,7 @@ EXPORT_SYMBOL(__ioremap);
 void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
 {
 	unsigned long last_addr;
-	void __iomem *p = __ioremap(phys_addr, size, _PAGE_PCD);
+	void __iomem *p = __ioremap(phys_addr, size, _PAGE_PCD | _PAGE_PWT);
 	if (!p) 
 		return p; 

Thanks,

[*]: latest pull calls set_memory_uc() which also sets the _PWT flag.

--
Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com

^ permalink raw reply	[flat|nested] 5+ messages in thread

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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-02-06 23:21 [Lguest/x86]: Clash with ioremap_nocache() + _PAGE_PWT Ahmed S. Darwish
2008-02-06 23:59 ` Ingo Molnar
2008-02-07  0:51   ` [PATCH] lguest: Accept guest _PAGE_PWT page table entries Ahmed S. Darwish
2008-02-07  1:00     ` Ingo Molnar
2008-03-04  1:37     ` Rusty Russell

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