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linux/arch/arm64/mm
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Will Deacon 71c8fc0c96 arm64: mm: Ensure writes to swapper are ordered wrt subsequent cache maintenance 
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: f992b4dfd5 ("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>
2018-06-22 17:23:40 +01:00
..
cache.S arm64: Add support for new control bits CTR_EL0.DIC and CTR_EL0.IDC 2018-03-09 13:57:57 +00:00
context.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
copypage.c arm64: Defer dcache flush in __cpu_copy_user_page 2015-12-17 11:07:13 +00:00
dma-mapping.c arm64: dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag 2018-06-19 14:19:21 +01:00
dump.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
extable.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fault.c arm64 updates for 4.18: 2018-06-08 11:10:58 -07:00
flush.c arm64: mm: drop addr parameter from sync icache and dcache 2018-04-24 09:23:00 +01:00
hugetlbpage.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
init.c treewide: use PHYS_ADDR_MAX to avoid type casting ULLONG_MAX 2018-06-15 07:55:25 +09:00
ioremap.c arm64: use is_vmalloc_addr 2017-02-09 13:47:56 +00:00
kasan_init.c arm64: kasan: avoid pfn_to_nid() before page array is initialized 2018-04-17 16:16:59 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmap.c exec: pass stack rlimit into mm layout functions 2018-04-11 10:28:37 -07:00
mmu.c arm64: Make sure permission updates happen for pmd/pud 2018-05-24 11:19:31 +01:00
numa.c arm64/numa: Drop duplicate message 2017-07-20 17:03:53 +01:00
pageattr.c arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing page tables 2018-02-16 18:13:57 +00:00
pgd.c arm64: handle 52-bit addresses in TTBR 2017-12-22 17:35:21 +00:00
physaddr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc.S arm64: mm: Ensure writes to swapper are ordered wrt subsequent cache maintenance 2018-06-22 17:23:40 +01:00
ptdump_debugfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00