linux-kernel - Re: [PATCH v7 5/8] arm64/kvm: expose MTE_STORE

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Message-ID: <86ecuybjon.wl-maz@kernel.org>
Date: Wed, 02 Jul 2025 18:12:56 +0100
From: Marc Zyngier <maz@...nel.org>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: catalin.marinas@....com,
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Subject: Re: [PATCH v7 5/8] arm64/kvm: expose MTE_STORE_ONLY feature to guest

On Wed, 18 Jun 2025 10:29:54 +0100,
Yeoreum Yun <yeoreum.yun@....com> wrote:
> 
> expose MTE_STORE_ONLY feature to guest.
> 
> Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
> ---
>  arch/arm64/kvm/sys_regs.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index c8c92cb9da01..7bc99ed201eb 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1620,7 +1620,8 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
>  		mask = ID_AA64PFR2_EL1_FPMR;
>  
>  		if (kvm_has_mte(vcpu->kvm))
> -			mask |= ID_AA64PFR2_EL1_MTEFAR;
> +			mask |= ID_AA64PFR2_EL1_MTEFAR |
> +				ID_AA64PFR2_EL1_MTESTOREONLY;
>  
>  		val &= mask;
>  		break;
> @@ -2884,7 +2885,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
>  				       ID_AA64PFR1_EL1_MTE)),
>  	ID_WRITABLE(ID_AA64PFR2_EL1,
>  		    ID_AA64PFR2_EL1_FPMR |
> -		    ID_AA64PFR2_EL1_MTEFAR),
> +		    ID_AA64PFR2_EL1_MTEFAR |
> +		    ID_AA64PFR2_EL1_MTESTOREONLY),
>  	ID_UNALLOCATED(4,3),
>  	ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
>  	ID_HIDDEN(ID_AA64SMFR0_EL1),

With the subject line fixed:

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

	M.

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