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| author | David S. Miller <davem@davemloft.net> | 2014-10-19 05:03:09 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-19 05:03:09 +0200 |
| commit | 84bd6d8b9c0f06b3f188efb479c77e20f05e9a8a (patch) | |
| tree | cd2253bd51ef69d5dd85f23325c4711ca0c9717f /arch/sparc/kernel/tsb.S | |
| parent | Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma (diff) | |
| download | linux-84bd6d8b9c0f06b3f188efb479c77e20f05e9a8a.tar.xz linux-84bd6d8b9c0f06b3f188efb479c77e20f05e9a8a.zip | |
sparc64: Fix corrupted thread fault code.
Every path that ends up at do_sparc64_fault() must install a valid
FAULT_CODE_* bitmask in the per-thread fault code byte.
Two paths leading to the label winfix_trampoline (which expects the
FAULT_CODE_* mask in register %g4) were not doing so:
1) For pre-hypervisor TLB protection violation traps, if we took
the 'winfix_trampoline' path we wouldn't have %g4 initialized
with the FAULT_CODE_* value yet. Resulting in using the
TLB_TAG_ACCESS register address value instead.
2) In the TSB miss path, when we notice that we are going to use a
hugepage mapping, but we haven't allocated the hugepage TSB yet, we
still have to take the window fixup case into consideration and
in that particular path we leave %g4 not setup properly.
Errors on this sort were largely invisible previously, but after
commit 4ccb9272892c33ef1c19a783cfa87103b30c2784 ("sparc64: sun4v TLB
error power off events") we now have a fault_code mask bit
(FAULT_CODE_BAD_RA) that triggers due to this bug.
FAULT_CODE_BAD_RA triggers because this bit is set in TLB_TAG_ACCESS
(see #1 above) and thus we get seemingly random bus errors triggered
for user processes.
Fixes: 4ccb9272892c ("sparc64: sun4v TLB error power off events")
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/tsb.S')
| -rw-r--r-- | arch/sparc/kernel/tsb.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc/kernel/tsb.S b/arch/sparc/kernel/tsb.S index 14158d40ba76..be98685c14c6 100644 --- a/arch/sparc/kernel/tsb.S +++ b/arch/sparc/kernel/tsb.S @@ -162,10 +162,10 @@ tsb_miss_page_table_walk_sun4v_fastpath: nop .previous - rdpr %tl, %g3 - cmp %g3, 1 + rdpr %tl, %g7 + cmp %g7, 1 bne,pn %xcc, winfix_trampoline - nop + mov %g3, %g4 ba,pt %xcc, etrap rd %pc, %g7 call hugetlb_setup |