4.9-stable review patch. If anyone has any objections, please let me know.
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From: Will Deacon will.deacon@arm.com
commit 71c8fc0c96abf8e53e74ed4d891d671e585f9076 upstream.
When rewriting swapper using nG mappings, we must performance cache maintenance around each page table access in order to avoid coherency problems with the host's cacheable alias under KVM. To ensure correct ordering of the maintenance with respect to Device memory accesses made with the Stage-1 MMU disabled, DMBs need to be added between the maintenance and the corresponding memory access.
This patch adds a missing DMB between writing a new page table entry and performing a clean+invalidate on the same line.
Fixes: f992b4dfd58b ("arm64: kpti: Add ->enable callback to remap swapper using nG mappings") Cc: stable@vger.kernel.org # 4.16.x- Acked-by: Mark Rutland mark.rutland@arm.com Signed-off-by: Will Deacon will.deacon@arm.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm64/mm/proc.S | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -186,8 +186,9 @@ ENDPROC(idmap_cpu_replace_ttbr1)
.macro __idmap_kpti_put_pgtable_ent_ng, type orr \type, \type, #PTE_NG // Same bit for blocks and pages - str \type, [cur_()\type()p] // Update the entry and ensure it - dc civac, cur_()\type()p // is visible to all CPUs. + str \type, [cur_()\type()p] // Update the entry and ensure + dmb sy // that it is visible to all + dc civac, cur_()\type()p // CPUs. .endm
/*