From: Kirill Tkhai <tkhai@yandex.ru>
To: sparclinux@vger.kernel.org
Subject: [PATCH]SPARC v9: __tsb_context_switch - demap old tsb_map_vaddr
Date: Tue, 05 Oct 2010 19:57:56 +0000 [thread overview]
Message-ID: <1286308676.11216.4.camel@hp> (raw)
SPARC v9: __tsb_context_switch - demap old tsb_map_vaddr
---
When TSB context switches in the function switch_mm() the following
situation could occur. We have old mapping between physical address
and tsb_map_vaddr in uTLB, and new mapping is written in fDTLB.
Because uDTLB has more priority than fDTLB, all transformations
occur through it, and TSB Pointer in tl0_damiss will be formed with
the wrong physical address. To prevent this, we need to flush old
tsb_map_vaddr (TSB_BASE) in TLB. Kernel version 2.6.35.7.
Signed-off-by: Tkhai Kirill <tkhai@yandex.ru>
---
--- arch/sparc/kernel/tsb.S.orig 2010-10-05 19:46:55.272218523 +0400
+++ arch/sparc/kernel/tsb.S 2010-10-05 19:48:56.136235329 +0400
@@ -396,6 +396,9 @@ __tsb_context_switch:
2: ldx [%o1 + TSB_CONFIG_MAP_VADDR], %o4
brz %o4, 9f
+ or %o4, 1 << 5, %o5
+ stxa %g0, [%o5] ASI_DMMU_DEMAP
+ membar #Sync
ldx [%o1 + TSB_CONFIG_MAP_PTE], %o5
sethi %hi(sparc64_highest_unlocked_tlb_ent), %g2
next reply other threads:[~2010-10-05 19:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-05 19:57 Kirill Tkhai [this message]
2010-10-05 20:38 ` [PATCH]SPARC v9: __tsb_context_switch - demap old tsb_map_vaddr David Miller
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