linux-kernel - Re: [PATCH] KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable

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Message-Id: <173442713502.3654654.5293442477717772457.b4-ty@linux.dev>
Date: Tue, 17 Dec 2024 01:19:08 -0800
From: Oliver Upton <oliver.upton@...ux.dev>
To: Marc Zyngier <maz@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Mark Brown <broonie@...nel.org>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable

On Mon, 16 Dec 2024 19:28:24 +0000, Mark Brown wrote:
> In commit 03c7527e97f7 ("KVM: arm64: Do not allow ID_AA64MMFR0_EL1.ASIDbits
> to be overridden") we made that bitfield in the ID registers unwritable
> however the change neglected to make the corresponding update to set_id_regs
> resulting in it failing:
> 
> # ok 56 ID_AA64MMFR0_EL1_BIGEND
> # ==== Test Assertion Failure ====
> #   aarch64/set_id_regs.c:434: masks[idx] & ftr_bits[j].mask == ftr_bits[j].mask
> #   pid=5566 tid=5566 errno=22 - Invalid argument
> #      1	0x00000000004034a7: test_vm_ftr_id_regs at set_id_regs.c:434
> #      2	0x0000000000401b53: main at set_id_regs.c:684
> #      3	0x0000ffff8e6b7543: ?? ??:0
> #      4	0x0000ffff8e6b7617: ?? ??:0
> #      5	0x0000000000401e6f: _start at ??:?
> #   0 != 0xf0 (masks[idx] & ftr_bits[j].mask != ftr_bits[j].mask)
> not ok 8 selftests: kvm: set_id_regs # exit=254
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: Fix set_id_regs selftest for ASIDBITS becoming unwritable
      https://git.kernel.org/kvmarm/kvmarm/c/212fbabe1dfe

--
Best,
Oliver