Messages in this thread Patch in this message | | | From | Khalid Aziz <> | Subject | [RFC PATCH v8 07/14] arm64/mm, xpfo: temporarily map dcache regions | Date | Wed, 13 Feb 2019 17:01:30 -0700 |
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From: Juerg Haefliger <juerg.haefliger@canonical.com>
If the page is unmapped by XPFO, a data cache flush results in a fatal page fault, so let's temporarily map the region, flush the cache, and then unmap it.
v6: actually flush in the face of xpfo, and temporarily map the underlying memory so it can be flushed correctly
CC: linux-arm-kernel@lists.infradead.org Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com> Signed-off-by: Tycho Andersen <tycho@docker.com> --- arch/arm64/mm/flush.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index 30695a868107..fad09aafd9d5 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -20,6 +20,7 @@ #include <linux/export.h> #include <linux/mm.h> #include <linux/pagemap.h> +#include <linux/xpfo.h> #include <asm/cacheflush.h> #include <asm/cache.h> @@ -28,9 +29,15 @@ void sync_icache_aliases(void *kaddr, unsigned long len) { unsigned long addr = (unsigned long)kaddr; + unsigned long num_pages = XPFO_NUM_PAGES(addr, len); + void *mapping[num_pages]; if (icache_is_aliasing()) { + xpfo_temp_map(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __clean_dcache_area_pou(kaddr, len); + xpfo_temp_unmap(kaddr, len, mapping, + sizeof(mapping[0]) * num_pages); __flush_icache_all(); } else { flush_icache_range(addr, addr + len); -- 2.17.1
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