[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <ea50404604bdbe1547601b6ea0af89e3da8886b0.1550088114.git.khalid.aziz@oracle.com>
Date: Wed, 13 Feb 2019 17:01:30 -0700
From: Khalid Aziz <khalid.aziz@...cle.com>
To: juergh@...il.com, tycho@...ho.ws, jsteckli@...zon.de, ak@...ux.intel.com,
torvalds@...ux-foundation.org, liran.alon@...cle.com,
keescook@...gle.com, akpm@...ux-foundation.org, mhocko@...e.com,
catalin.marinas@....com, will.deacon@....com, jmorris@...ei.org,
konrad.wilk@...cle.com
Cc: Juerg Haefliger <juerg.haefliger@...onical.com>,
deepa.srinivasan@...cle.com, chris.hyser@...cle.com,
tyhicks@...onical.com, dwmw@...zon.co.uk, andrew.cooper3@...rix.com,
jcm@...hat.com, boris.ostrovsky@...cle.com, kanth.ghatraju@...cle.com,
oao.m.martins@...cle.com, jmattson@...gle.com,
pradeep.vincent@...cle.com, john.haxby@...cle.com, tglx@...utronix.de,
kirill.shutemov@...ux.intel.com, hch@....de, steven.sistare@...cle.com,
labbott@...hat.com, luto@...nel.org, dave.hansen@...el.com,
peterz@...radead.org, kernel-hardening@...ts.openwall.com,
linux-mm@...ck.org, x86@...nel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Tycho Andersen <tycho@...ker.com>
Subject: [RFC PATCH v8 07/14] arm64/mm, xpfo: temporarily map dcache regions
From: Juerg Haefliger <juerg.haefliger@...onical.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@...ts.infradead.org
Signed-off-by: Juerg Haefliger <juerg.haefliger@...onical.com>
Signed-off-by: Tycho Andersen <tycho@...ker.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
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
