From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 540F0C43458 for ; Fri, 10 Jul 2026 14:24:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=S37+Tr1u2ck0VLNMPer9SSEFBbV2lCDeoh8L8L9B4Z0=; b=NB2DwbNguX/aRChj0Shfg/Jn73 xFRX5vXT+lrlvDnn7SGghUhccJ6B3Y0e5aqD/6YDoVZB3qQK1axvmjCWlFaBF2D509FYRFKN2ELbe VjOCi81/qVVxT5J0T0ooHfARU1tfLS2XKeJOdc83DkMmQViV/r9nqn2kS/NG+5IjXF98cSMT7JxE+ TQ/wDuMhT4a9z6XoWZTvzZzk47OgeSSCbMsj7HG2t+wAwo1lZgmOgiuHABYjXxMMBm1Sbn6A3tv+D 0kXMg89rLgYGMRXpcZMrOu+mVcwsYvYZ9H1sfk2j/Ng12d/rcdA7nO2HEXVquyRYUQaZtmCnRxeKZ z1c77qQw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wiC9j-000000054pQ-3jaR; Fri, 10 Jul 2026 14:24:43 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wiC9h-000000054oc-1zxL for linux-arm-kernel@lists.infradead.org; Fri, 10 Jul 2026 14:24:42 +0000 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260702160248.1377250-28-maz@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260710_072441_741088_80785A08 X-CRM114-Status: GOOD ( 15.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 >