From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7EE00346798 for ; Fri, 10 Jul 2026 14:24:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783693481; cv=none; b=DRLb3lQtQ+1w/p2+Iy2NY0nhs4f8mr6M/tH7MpgxCLXxqELlJMHUmu2ci1qZSUFXT3kBF25T/VUPm6TXPa+8kJg8W9zoILs1GqnW2pmRnURkk7dxWPpKecDXymIpcd6NPyCGqE54JDdAULyxVgOAXHag16McFAEVXJxj1Frcu2s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783693481; c=relaxed/simple; bh=57yy5wTX9Ho7bi/LUfyKbKgFguqEUaBdyCNXSxpomDw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WxaGJROJAoMYVXcWrqfWRwEgIGE/smy6Wec9Kgjml8GPpDB+zbQ5+y5jOmt0rLAc32Ouk+pjy5qPYAdUhn8QyLRGi2vAG2/3IqVG5I10F3RGsY092sem+0OgeazS4n6MXyfp1+RJ7F7lxaKddhR7YcEX5JStV69ShlKCLm+B2jI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=KDnsVFPm; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="KDnsVFPm" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6B967176A; Fri, 10 Jul 2026 07:24:34 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.2.213.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 72CA23F7B4; Fri, 10 Jul 2026 07:24:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783693478; bh=57yy5wTX9Ho7bi/LUfyKbKgFguqEUaBdyCNXSxpomDw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=KDnsVFPm01cedCI0/W1Ov+nbDD+1CVJd5UTLnCY0bXSpzfghDgwZjWbC4VNF/nwbR Sw6NUD/64kRr4B57VVC9r61PBA4BnXdMfvEAXl7Vv2thWhBX1vyo6aIqWlg2EtNB6T yjCYS77HwzB9up7X1ro8yvb8QBGSGCEPVfpgKS8k= Date: Fri, 10 Jul 2026 15:24:34 +0100 From: Joey Gouly To: Marc Zyngier Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, Steffen Eiden , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: Re: [PATCH 27/28] KVM: arm64: Expose FEAT_NV3 to guests Message-ID: <20260710142434.GC12293@e124191.cambridge.arm.com> References: <20260702160248.1377250-1-maz@kernel.org> <20260702160248.1377250-28-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260702160248.1377250-28-maz@kernel.org> On Thu, Jul 02, 2026 at 05:02:47PM +0100, Marc Zyngier wrote: > Further enable FEAT_NV3 by making it visible to NV guests. > > Signed-off-by: Marc Zyngier Reviewed-by: Joey Gouly > --- > arch/arm64/kvm/nested.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c > index c9bf04944f9cb..64c8fb82fadf6 100644 > --- a/arch/arm64/kvm/nested.c > +++ b/arch/arm64/kvm/nested.c > @@ -1728,7 +1728,7 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) > * You get EITHER > * > * - FEAT_VHE without FEAT_E2H0 > - * - FEAT_NV limited to FEAT_NV2(p1) > + * - FEAT_NV limited to FEAT_NV2(p1)/NV3 > * - HCR_EL2.NV1 being RES0 > * > * OR > @@ -1740,7 +1740,9 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val) > if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features)) { > val = 0; > } else { > - if (cpus_have_final_cap(ARM64_HAS_NV2P1)) > + if (cpus_have_final_cap(ARM64_HAS_NV3)) > + val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV3); > + else if (cpus_have_final_cap(ARM64_HAS_NV2P1)) > val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR4_EL1, NV_frac, NV2P1); > else > val = SYS_FIELD_PREP_ENUM(ID_AA64MMFR4_EL1, NV_frac, NV2_ONLY); > -- > 2.47.3 >