| Message ID | 20190110124951.15473-5-richard.henderson@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | target/arm: Implement TBI for user-only | expand |
On Thu, 10 Jan 2019 at 12:50, Richard Henderson <richard.henderson@linaro.org> wrote: > > This has been enabled in the linux kernel since v3.11 > (commit d50240a5f6cea, 2013-09-03, > "arm64: mm: permit use of tagged pointers at EL0"). > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > target/arm/cpu.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/target/arm/cpu.c b/target/arm/cpu.c > index 14bc24a35a..5eff6995ee 100644 > --- a/target/arm/cpu.c > +++ b/target/arm/cpu.c > @@ -174,6 +174,12 @@ static void arm_cpu_reset(CPUState *s) > env->vfp.zcr_el[1] = cpu->sve_max_vq - 1; > env->vfp.zcr_el[2] = env->vfp.zcr_el[1]; > env->vfp.zcr_el[3] = env->vfp.zcr_el[1]; > + /* > + * Enable TBI0 and TBI1. While the real kernel only enables TBI0, > + * turning on both here will produce smaller code and otherwise > + * make no difference to the user-level emulation. > + */ > + env->cp15.tcr_el[1].raw_tcr = (3ULL << 37); > #else > /* Reset into the highest available EL */ > if (arm_feature(env, ARM_FEATURE_EL3)) { > -- > 2.17.2 Reviewed-by: Peter Maydell <peter.maydell@linaro.org> thanks -- PMM
diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 14bc24a35a..5eff6995ee 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -174,6 +174,12 @@ static void arm_cpu_reset(CPUState *s) env->vfp.zcr_el[1] = cpu->sve_max_vq - 1; env->vfp.zcr_el[2] = env->vfp.zcr_el[1]; env->vfp.zcr_el[3] = env->vfp.zcr_el[1]; + /* + * Enable TBI0 and TBI1. While the real kernel only enables TBI0, + * turning on both here will produce smaller code and otherwise + * make no difference to the user-level emulation. + */ + env->cp15.tcr_el[1].raw_tcr = (3ULL << 37); #else /* Reset into the highest available EL */ if (arm_feature(env, ARM_FEATURE_EL3)) {
This has been enabled in the linux kernel since v3.11 (commit d50240a5f6cea, 2013-09-03, "arm64: mm: permit use of tagged pointers at EL0"). Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- target/arm/cpu.c | 6 ++++++ 1 file changed, 6 insertions(+)