linux-kernel - Re: next-20240219: arm64: boot failed

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Message-ID: <a7d8e529-9a44-3f88-50ef-d87b80515c36@huawei.com>
Date: Mon, 19 Feb 2024 22:46:46 +0800
From: Zenghui Yu <yuzenghui@...wei.com>
To: Marc Zyngier <maz@...nel.org>
CC: Naresh Kamboju <naresh.kamboju@...aro.org>, open list
	<linux-kernel@...r.kernel.org>, Linux ARM
	<linux-arm-kernel@...ts.infradead.org>, <lkft-triage@...ts.linaro.org>, Linux
 Regressions <regressions@...ts.linux.dev>, Catalin Marinas
	<catalin.marinas@....com>, Arnd Bergmann <arnd@...db.de>, Dan Carpenter
	<dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>
Subject: Re: next-20240219: arm64: boot failed - gic_of_init

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,

Thanks,
Zenghui