From nobody Thu Dec 18 08:37:08 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9DA1C3E467 for ; Thu, 18 Jul 2024 03:50:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721274644; cv=none; b=gdd8UZcRRuwJ4cBCEW5mLE/ysrGn/idLq9elTVh88gYd66C9lmXR824UnjogHl+3B8TnZ2d8qmOg+g8OeKkQSZux+2M+AtlL0BoCHVKMDePRGOidFFMMOf8wR7Fx6tKqFrV3afiAt3ccLzBT3h5EOVkDQckvVCYdVpKRDMN2CLA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721274644; c=relaxed/simple; bh=oMFhQ3QxnmOyJFBLq5dfBbQ59iYFLZ5ny16U/t8rmkA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JFo+V5ylvJdC8QIoi9LZN/KPeA1Jotr85JwjfPZ7WxT1eMZ1lOjFsj2u4amOtJjFxB7wv4DEEAexMHUJHtuWB2K/OFantMr8DbqVAZvHeUadOFsPuY89RWZUUdc+GhgRDZePa4siv9/JL2IwWA231Tj/RAZUK5qkA9lnbW+1KRk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=brYnvFUP; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="brYnvFUP" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1721274641; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=01+xBiZ/0gp1jFVu1EnU7xZgjeS+cc/9RhAq/NQ3xxQ=; b=brYnvFUP9TklM2Xuk76IVSAH9i0vCZWUqHiBFzWNoLueAvYvXIh+VEPMzs4Ds/FbdMImeO 8dqFHNlIVs+cd3ccegAtJMe/9dtd/5QKtx1KIQXv3zIdg/gXQ/5yk9UjC1Dh0Sn2uLIVqm cQyeqRh+M1C+EtzfhFfXL6dMuezttWY= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-125-RhUDsuHeN9aINI0bg63zLA-1; Wed, 17 Jul 2024 23:50:38 -0400 X-MC-Unique: RhUDsuHeN9aINI0bg63zLA-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 354B71955F43; Thu, 18 Jul 2024 03:50:36 +0000 (UTC) Received: from virt-mtcollins-01.lab.eng.rdu2.redhat.com (virt-mtcollins-01.lab.eng.rdu2.redhat.com [10.8.1.196]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 5FD561955D47; Thu, 18 Jul 2024 03:50:33 +0000 (UTC) From: Shaoqin Huang To: Oliver Upton , Marc Zyngier , kvmarm@lists.linux.dev, Mark Brown Cc: Eric Auger , Sebastian Ott , Cornelia Huck , Shaoqin Huang , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/3] KVM: arm64: Disable fields that KVM doesn't know how to handle in ID_AA64PFR1_EL1 Date: Wed, 17 Jul 2024 23:50:14 -0400 Message-Id: <20240718035017.434996-2-shahuang@redhat.com> In-Reply-To: <20240718035017.434996-1-shahuang@redhat.com> References: <20240718035017.434996-1-shahuang@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Content-Type: text/plain; charset="utf-8" For some of the fields in the ID_AA64PFR1_EL1 register, KVM doesn't know how to handle them right now. So explicitly disable them in the register accessor, then those fields value will be masked to 0 even if on the hardware the field value is 1. This will benifit the migration if the host and VM have different values when restoring a VM. Those fields include RNDR_trap, NMI, MTE_frac, GCS, THE, MTEX, DF2, PFAR. Signed-off-by: Shaoqin Huang --- arch/arm64/kvm/sys_regs.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 22b45a15d068..4508288b9d38 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1531,6 +1531,14 @@ static u64 __kvm_read_sanitised_id_reg(const struct = kvm_vcpu *vcpu, val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE); =20 val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_SME); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_RNDR_trap); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_NMI); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTE_frac); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_GCS); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_THE); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_MTEX); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_DF2); + val &=3D ~ARM64_FEATURE_MASK(ID_AA64PFR1_EL1_PFAR); break; case SYS_ID_AA64ISAR1_EL1: if (!vcpu_has_ptrauth(vcpu)) --=20 2.40.1