target/arm: Add support for DIT (Data Independent Timing)

[PATCH 2/2] target/arm: Set ID_AA64PFR0.DIT and ID_PFR0.DIT to 1 for "max" AA64 CPU

Posted by Rebecca Cran 5 years, 2 months ago

Enable FEAT_DIT for the "max" AARCH64 CPU.

Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
---
 target/arm/cpu64.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index 649213082ff9..223e0bfd22c2 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -641,6 +641,7 @@ static void aarch64_max_initfn(Object *obj)
         t = FIELD_DP64(t, ID_AA64PFR0, SVE, 1);
         t = FIELD_DP64(t, ID_AA64PFR0, FP, 1);
         t = FIELD_DP64(t, ID_AA64PFR0, ADVSIMD, 1);
+        t = FIELD_DP64(t, ID_AA64PFR0, DIT, 1);
         cpu->isar.id_aa64pfr0 = t;
 
         t = cpu->isar.id_aa64pfr1;
@@ -689,6 +690,10 @@ static void aarch64_max_initfn(Object *obj)
         u = FIELD_DP32(u, ID_ISAR6, SPECRES, 1);
         cpu->isar.id_isar6 = u;
 
+        u = cpu->isar.id_pfr0;
+        u = FIELD_DP32(u, ID_PFR0, DIT, 1);
+        cpu->isar.id_pfr0 = u;
+
         u = cpu->isar.id_mmfr3;
         u = FIELD_DP32(u, ID_MMFR3, PAN, 2); /* ATS1E1 */
         cpu->isar.id_mmfr3 = u;
-- 
2.26.2

Re: [PATCH 2/2] target/arm: Set ID_AA64PFR0.DIT and ID_PFR0.DIT to 1 for "max" AA64 CPU

Posted by Richard Henderson 5 years, 2 months ago

On 12/10/20 11:13 PM, Rebecca Cran wrote:
> Enable FEAT_DIT for the "max" AARCH64 CPU.
> 
> Signed-off-by: Rebecca Cran <rebecca@nuviainc.com>
> ---
>  target/arm/cpu64.c | 5 +++++
>  1 file changed, 5 insertions(+)

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

r~

[PATCH 1/2] target/arm: add support for FEAT_DIT, Data Independent Timing
[PATCH 2/2] target/arm: Set ID_AA64PFR0.DIT and ID_PFR0.DIT to 1 for "max" AA64 CPU