On Sunday 30 October 2016 05:30 PM, Marek Vasut wrote:
On 10/30/2016 02:59 AM, Keerthy wrote:
On Saturday 29 October 2016 11:19 PM, Marek Vasut wrote:
On 10/29/2016 07:47 PM, Tom Rini wrote:
On Sat, Oct 29, 2016 at 07:44:34PM +0200, Marek Vasut wrote:
On 10/29/2016 07:41 PM, Tom Rini wrote:
On Sat, Oct 29, 2016 at 03:19:10PM +0530, Keerthy wrote:
While we setup the mmu initially we mark set_section_dcache with
DCACHE_OFF flag. In case of non-LPAE mode the DCACHE_OFF macro
is rightly defined with TTB_SECT_XN_MASK set so as to mark all the
4GB XN. In case of LPAE mode XN(Execute-never) bit is not set with
DCACHE_OFF. Hence XN bit is not set by default for DCACHE_OFF which
keeps all the regions execute okay and this leads to random
speculative
fetches in random memory regions which was eventually caught by
kernel
omap-l3-noc driver.
Fix this to mark the regions as XN by default.
Signed-off-by: Keerthy <j-keer...@ti.com>
Reviewed-by: Alexander Graf <ag...@suse.de>
Reviewed-by: Tom Rini <tr...@konsulko.com>
Isn't this patch exactly undoing the following one ?
commit 8890c2fbe6ed4c5ca9a61f21e846a55f8f2c38fc
Author: Marek Vasut <>
Date: Tue Dec 29 19:44:02 2015 +0100
arm: Remove S bit from MMU section entry
Restore the old behavior of the MMU section entries configuration,
which is without the S-bit.
Is it? I guess perhaps you and Keerthy need to chat then as there's
some other problem they're addressing.
Ummmm, wait a second, I think this one adds XN bit and the previous one
removed S bit. I think I was wrong, but please double-check this. I
recall we had some odd cache issues on V7 back then.
Marek,
First and foremost if we git blame on the file:
arch/arm/include/asm/system.h
your commit:
8890c2fbe6ed4c5ca9a61f21e846a55f8f2c38fc
arm: Remove S bit from MMU section entry
It is removing S bit under
#elif defined(CONFIG_CPU_V7)
I am adding the missing XN bit under:
#ifdef CONFIG_ARMV7_LPAE
So we are dealing with different modes.
In a nutshell your patch removes S bit from MMU section entry for
non-LPAE cases for ARMV7 and mine adds XN bit for LPAE cases.
Hope this clears out the confusion.
Yeah, it does, thanks.
I hope this patch can be pulled if there are no further concerns.
Thanks,
Keerthy
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