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sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

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sparc: Resolve conflict between sparc v9 and M7 on usage of bit 9 of TTE

Bit 9 of TTE is CV (Cacheable in V-cache) on sparc v9 processor while
the same bit 9 is MCDE (Memory Corruption Detection Enable) on M7
processor. This creates a conflicting usage of the same bit. Kernel
sets TTE.cv bit on all pages for sun4v architecture which works well
for sparc v9 but enables memory corruption detection on M7 processor
which is not the intent. This patch adds code to determine if kernel
is running on M7 processor and takes steps to not enable memory
corruption detection in TTE erroneously.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Khalid Aziz
2015-05-27 10:00:46 -06:00
committed by David S. Miller
parent f0c1a11737
commit 494e5b6fae
6 changed files with 104 additions and 22 deletions
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2
arch/sparc/include/asm/trap_block.h
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@@ -79,6 +79,8 @@ struct sun4v_2insn_patch_entry {
};
extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
__sun4v_2insn_patch_end;
extern struct sun4v_2insn_patch_entry __sun_m7_2insn_patch,
__sun_m7_2insn_patch_end;
#endif /* !(__ASSEMBLY__) */