On Thu, Nov 5, 2020 at 6:26 PM Catalin Marinas [off-list ref] wrote:

On Thu, Nov 05, 2020 at 12:18:45AM +0100, Andrey Konovalov wrote:

quoted

diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 06ba6c923ab7..fcfbefcc3174 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c

@@ -121,6 +121,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag)
      return ptr;
 }

+void __init mte_init_tags(u64 max_tag)
+{
+     /* Enable MTE Sync Mode for EL1. */
+     sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC);
+     isb();
+}

Is this going to be called on each CPU? I quickly went through the rest
of the patches and couldn't see how.

Yes, on each CPU. This is done via kasan_init_hw_tags() that is called
from cpu_enable_mte(). This change is added in the "kasan, arm64:
implement HW_TAGS runtime". Would it make sense to put it into a
separate patch?

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