Re: next-20240219: arm64: boot failed - gic_of_init

[Marc Zyngier]

On 2024-02-19 14:46, Zenghui Yu wrote:
> On 2024/2/19 19:32, Marc Zyngier wrote:
> > For what it is worth, I've just tested both defconfig and my own
> > configuration with both 4k (kvmtool, QEMU+KVM and on SynQuacer) and
> > 16k (kvmtool), without any obvious problem.
>
> I had a quick test on top of next-20240219 with defconfig.  I can
> reproduce it with QEMU parameter '-cpu max -accel tcg', but things are
> fine with '-cpu max,lpa2=off -accel tcg'.
>
> Bisection shows that the problem happens when we start putting the
> latest arm64 and kvmarm changes together.  The following hack fixes the
> problem for me (but I **only** write it for kernel built with defconfig
> with ARM64_4K_PAGES=y atm).
>
> I can investigate it further tomorrow (as it's too late now ;-) ).  Or
> maybe Marc or Catalin can help fix it with a proper approach.
>
> diff --git a/arch/arm64/kernel/cpufeature.c 
> b/arch/arm64/kernel/cpufeature.c
> index 4f7662008ede..babdc3f4721b 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -2798,6 +2798,7 @@ static const struct arm64_cpu_capabilities
> arm64_features[] = {
> | 		.sign = FTR_SIGNED,
> | 		.field_pos = ID_AA64MMFR0_EL1_TGRAN4_SHIFT,
> | 		.min_field_value = ID_AA64MMFR0_EL1_TGRAN4_52_BIT,
> |+		.max_field_value = BIT(ID_AA64MMFR0_EL1_TGRAN4_WIDTH - 1) - 1,
> | #else
> | 		.sign = FTR_UNSIGNED,
> | 		.field_pos = ID_AA64MMFR0_EL1_TGRAN16_SHIFT,

Yup, got to that point too.

Working on a slightly more elaborate fix.

Thanks,

        M.
--
Jazz is not dead. It just smells funny...