On Thu, Aug 27, 2020 at 12:40 PM Catalin Marinas
[off-list ref] wrote:
On Fri, Aug 14, 2020 at 07:27:08PM +0200, Andrey Konovalov wrote:
quoted
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 152d74f2cc9c..6880ddaa5144 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -38,7 +38,7 @@
/* PTWs cacheable, inner/outer WBWA */
#define TCR_CACHE_FLAGS TCR_IRGN_WBWA | TCR_ORGN_WBWA
-#ifdef CONFIG_KASAN_SW_TAGS
+#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
#define TCR_KASAN_FLAGS TCR_TBI1
#else
#define TCR_KASAN_FLAGS 0
I prefer to turn TBI1 on only if MTE is present. So on top of the v8
user series, just do this in __cpu_setup.
Started working on this, but realized that I don't understand what
exactly is suggested here. TCR_KASAN_FLAGS are used in __cpu_setup(),
so this already happens in __cpu_setup().
Do you mean that TBI1 should be enabled when CONFIG_ARM64_MTE is
enabled, but CONFIG_KASAN_HW_TAGS is disabled?
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