linux-kernel - Re: [PATCH v3 2/7] arm64/kvm: expose FEAT

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Message-ID: <86cyaibjgx.wl-maz@kernel.org>
Date: Wed, 02 Jul 2025 18:17:34 +0100
From: Marc Zyngier <maz@...nel.org>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: catalin.marinas@....com,
	will@...nel.org,
	broonie@...nel.org,
	oliver.upton@...ux.dev,
	ardb@...nel.org,
	frederic@...nel.org,
	james.morse@....com,
	joey.gouly@....com,
	scott@...amperecomputing.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/7] arm64/kvm: expose FEAT_LSUI to guest

On Tue, 17 Jun 2025 19:36:30 +0100,
Yeoreum Yun <yeoreum.yun@....com> wrote:
> 
> expose FEAT_LSUI to guest.
> 
> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> ---
>  arch/arm64/kvm/sys_regs.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 76c2f0da821f..5c5a9c3ace2f 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1636,7 +1636,8 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
>  			val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT);
>  		break;
>  	case SYS_ID_AA64ISAR3_EL1:
> -		val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_FAMINMAX;
> +		val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_FAMINMAX |
> +		       ID_AA64ISAR3_EL1_LSUI;
>  		break;
>  	case SYS_ID_AA64MMFR2_EL1:
>  		val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
> @@ -2921,7 +2922,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
>  					ID_AA64ISAR2_EL1_APA3 |
>  					ID_AA64ISAR2_EL1_GPA3)),
>  	ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FPRCVT |
> -				       ID_AA64ISAR3_EL1_FAMINMAX)),
> +				       ID_AA64ISAR3_EL1_FAMINMAX | ID_AA64ISAR3_EL1_LSUI)),
>  	ID_UNALLOCATED(6,4),
>  	ID_UNALLOCATED(6,5),
>  	ID_UNALLOCATED(6,6),

In the future, please Cc the relevant people and mailing lists.

With $SUBJECT fixed to match the KVM/arm64 log,

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.