[Xen-devel] [PATCH v2 10/17] xen: arm64: disable alignment traps

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

The mem* primitives which I am about to import from Linux in a subsequent
patch rely on the hardware handling misalignment.

The benefits of an optimised memcpy etc outweigh the downsides.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
v2: fix typo in commit message and correct comment which refers to alignment
trapping status.
---
 xen/arch/arm/arm64/head.S |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
index 9547ef5..d3e773d 100644
--- a/xen/arch/arm/arm64/head.S
+++ b/xen/arch/arm/arm64/head.S
@@ -239,9 +239,9 @@ skip_bss:
          * Write-implies-XN disabled (for now),
          * D-cache disabled (for now),
          * I-cache enabled,
-         * Alignment checking enabled,
+         * Alignment checking disabled,
          * MMU translation disabled (for now). */
-        ldr   x0, =(HSCTLR_BASE|SCTLR_A)
+        ldr   x0, =(HSCTLR_BASE)
         msr   SCTLR_EL2, x0
 
         /* Rebuild the boot pagetable's first-level entries. The structure
-- 
1.7.10.4


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