Re: [PATCH] arm_gicv3: Fix ICC_BPR1 reset value when EL3 not implemented

["Alex Bennée" <alex.bennee@linaro.org>]

Peter Maydell <peter.maydell@linaro.org> writes:

> If EL3 is not implemented (ie only one security state) then the
> one and only ICC_BPR1 register behaves like the Non-secure
> ICC_BPR1 in an EL3-present configuration. In particular, its
> reset value is GIC_MIN_BPR_NS, not GIC_MIN_BPR.
>
> Correct the erroneous reset value; this fixes a problem where
> we might hit the assert added in commit a89ff39ee901.
>
> Reported-by: Alex Bennée <alex.bennee@linaro.org>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  hw/intc/arm_gicv3_cpuif.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/hw/intc/arm_gicv3_cpuif.c b/hw/intc/arm_gicv3_cpuif.c
> index 09d8ba0..5cbafaf 100644
> --- a/hw/intc/arm_gicv3_cpuif.c
> +++ b/hw/intc/arm_gicv3_cpuif.c
> @@ -2039,11 +2039,7 @@ static void icc_reset(CPUARMState *env, const ARMCPRegInfo *ri)
>      cs->icc_pmr_el1 = 0;
>      cs->icc_bpr[GICV3_G0] = GIC_MIN_BPR;
>      cs->icc_bpr[GICV3_G1] = GIC_MIN_BPR;
> -    if (arm_feature(env, ARM_FEATURE_EL3)) {
> -        cs->icc_bpr[GICV3_G1NS] = GIC_MIN_BPR_NS;
> -    } else {
> -        cs->icc_bpr[GICV3_G1NS] = GIC_MIN_BPR;
> -    }
> +    cs->icc_bpr[GICV3_G1NS] = GIC_MIN_BPR_NS;
>      memset(cs->icc_apr, 0, sizeof(cs->icc_apr));
>      memset(cs->icc_igrpen, 0, sizeof(cs->icc_igrpen));
>      cs->icc_ctlr_el3 = ICC_CTLR_EL3_NDS | ICC_CTLR_EL3_A3V |


--
Alex Bennée