From: Juerg Haefliger <juerg.haefli...@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.
CC: linux-arm-ker...@lists.infradead.org
Signed-off-by: Juerg Haefliger <juerg.haefli...@canonical.com>
Signed-off-by: Tycho Andersen <ty...@tycho.ws>
---
v6: actually flush in the face of xpfo, and temporarily map the underlying
memory so it can be flushed correctly
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 5c9073bace83..114e8bc5a3dc 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 {
/*
--
2.17.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
