diff mbox series

[v3,20/21] target/arm: Enable MTE for user-only

Message ID 20210115224645.1196742-21-richard.henderson@linaro.org
State New
Headers show
Series target-arm: Implement ARMv8.5-MemTag, user mode | expand

Commit Message

Richard Henderson Jan. 15, 2021, 10:46 p.m. UTC
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 target/arm/cpu.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

-- 
2.25.1

Comments

Peter Maydell Jan. 22, 2021, 2:02 p.m. UTC | #1
On Fri, 15 Jan 2021 at 22:47, Richard Henderson
<richard.henderson@linaro.org> wrote:
>

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

> ---

>  target/arm/cpu.c | 16 ++++++++++++++++

>  1 file changed, 16 insertions(+)

>

> diff --git a/target/arm/cpu.c b/target/arm/cpu.c

> index abc0affd00..5e613a747a 100644

> --- a/target/arm/cpu.c

> +++ b/target/arm/cpu.c

> @@ -208,6 +208,22 @@ static void arm_cpu_reset(DeviceState *dev)

>           * Do not modify this without other changes.

>           */

>          env->cp15.tcr_el[1].raw_tcr = (3ULL << 37);

> +

> +        /* Enable MTE */

> +        if (cpu_isar_feature(aa64_mte, cpu)) {

> +            /* Enable tag access, but leave TCF0 as No Effect (0). */

> +            env->cp15.sctlr_el[1] |= SCTLR_ATA0;

> +            /*

> +             * Exclude all tags, so that tag 0 is always used.

> +             * This corresponds to Linux current->thread.gcr_incl = 0.

> +             *

> +             * Set RRND, so that helper_irg() will generate a seed later.

> +             * Here in cpu_reset(), the crypto subsystem has not yet been

> +             * initialized.

> +             */

> +            env->cp15.gcr_el1 = 0x1ffff;

> +        }

> +

>  # ifdef TARGET_TAGGED_ADDRESSES

>          env->untagged_addr_mask = -1;

>  # endif

> --


Reviewed-by: Peter Maydell <peter.maydell@linaro.org>


thanks
-- PMM
diff mbox series

Patch

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index abc0affd00..5e613a747a 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -208,6 +208,22 @@  static void arm_cpu_reset(DeviceState *dev)
          * Do not modify this without other changes.
          */
         env->cp15.tcr_el[1].raw_tcr = (3ULL << 37);
+
+        /* Enable MTE */
+        if (cpu_isar_feature(aa64_mte, cpu)) {
+            /* Enable tag access, but leave TCF0 as No Effect (0). */
+            env->cp15.sctlr_el[1] |= SCTLR_ATA0;
+            /*
+             * Exclude all tags, so that tag 0 is always used.
+             * This corresponds to Linux current->thread.gcr_incl = 0.
+             *
+             * Set RRND, so that helper_irg() will generate a seed later.
+             * Here in cpu_reset(), the crypto subsystem has not yet been
+             * initialized.
+             */
+            env->cp15.gcr_el1 = 0x1ffff;
+        }
+
 # ifdef TARGET_TAGGED_ADDRESSES
         env->untagged_addr_mask = -1;
 # endif