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| author | Will Deacon <will.deacon@arm.com> | 2011-05-26 11:23:43 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-05-26 12:14:33 +0100 |
| commit | 52af9c6cd863fe37d1103035ec7ee22ac1296458 (patch) | |
| tree | fd6b4e6d7b3bc2881422fb5e735c5b9eda62662a /arch/arm/mm/proc-v7.S | |
| parent | d427958a46af24f75d0017c45eadd172273bbf33 (diff) | |
| download | lwn-52af9c6cd863fe37d1103035ec7ee22ac1296458.tar.gz lwn-52af9c6cd863fe37d1103035ec7ee22ac1296458.zip | |
ARM: 6943/1: mm: use TTBR1 instead of reserved context ID
On ARMv7 CPUs that cache first level page table entries (like the
Cortex-A15), using a reserved ASID while changing the TTBR or flushing
the TLB is unsafe.
This is because the CPU may cache the first level entry as the result of
a speculative memory access while the reserved ASID is assigned. After
the process owning the page tables dies, the memory will be reallocated
and may be written with junk values which can be interpreted as global,
valid PTEs by the processor. This will result in the TLB being populated
with bogus global entries.
This patch avoids the use of a reserved context ID in the v7 switch_mm
and ASID rollover code by temporarily using the swapper_pg_dir pointed
at by TTBR1, which contains only global entries that are not tagged
with ASIDs.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 3c3867850a30..b3b566ec83d3 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -108,18 +108,16 @@ ENTRY(cpu_v7_switch_mm) #ifdef CONFIG_ARM_ERRATA_430973 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB #endif -#ifdef CONFIG_ARM_ERRATA_754322 - dsb -#endif - mcr p15, 0, r2, c13, c0, 1 @ set reserved context ID - isb -1: mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 + mrc p15, 0, r2, c2, c0, 1 @ load TTB 1 + mcr p15, 0, r2, c2, c0, 0 @ into TTB 0 isb #ifdef CONFIG_ARM_ERRATA_754322 dsb #endif mcr p15, 0, r1, c13, c0, 1 @ set context ID isb + mcr p15, 0, r0, c2, c0, 0 @ set TTB 0 + isb #endif mov pc, lr ENDPROC(cpu_v7_switch_mm) |