From nobody Fri Nov 29 02:56:13 2024 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 9906D18784C for ; Thu, 26 Sep 2024 03:23:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727321003; cv=none; b=ntIYsLlAcHrYNkGtH0V3oc6IcxOBWxeUQdaFCVHp4Jr3dvqzjBOYUaMl1AHOkfxAni46xSeDHC/Db/dgLccpOZuzaTx2ftQpzvqU4bv6f7c6gJEHkXyjltIpToZpT9NT29j4cs3SHdJGNovSp3sN8U/ue0UfH2FdFXZD0VtYdqI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727321003; c=relaxed/simple; bh=624SmO8XUNU38mpOIvZAumZSxp/fQT8P4sS1GJiW+pw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Fe4fQg6RGcdnlKp9T4u/M6cpEd0c9xOl2LdyxPx69c9tLY0nwxKfEiIbbGBBxa/PSMg6jIjv6WEJOM3lCYSKIXtbRCkAHSFkbWagtoKkw1+ILj7PA1LNRtSX1B6BACb0aHo2hMDvt4KuJko8dgHe5Km9ANHoxyi2cHNCYByLL20= 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=JdEnEsW1; arc=none smtp.client-ip=170.10.133.124 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="JdEnEsW1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727320999; 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=utrx0K/+VugFVIukkmcrJK6P1DSpckYEB9F1vob9W3U=; b=JdEnEsW1plWAC6HZP0NR+Qfwt/Lj5m3ryUIsyIrpFw10gZWPWm7ocJnUsV5FTIx95crh7B LoHm8riShPrZyXs67cR+MAXdpn+KHbTWUjaBwfX28+KR34y/jnVDgN06KzyjKNJD8ruN/s tWjRT97BINKhb+P9hrvxf4U9NJab+ZM= 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-584-7yAz8LruPE6dXZbcRoFGBw-1; Wed, 25 Sep 2024 23:23:16 -0400 X-MC-Unique: 7yAz8LruPE6dXZbcRoFGBw-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.17]) (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 B8B8E19373E5; Thu, 26 Sep 2024 03:23:14 +0000 (UTC) Received: from virt-mtcollins-01.lab.eng.rdu2.redhat.com (unknown [10.8.1.196]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1217A19560A3; Thu, 26 Sep 2024 03:23:11 +0000 (UTC) From: Shaoqin Huang To: Oliver Upton , Marc Zyngier , kvmarm@lists.linux.dev Cc: Eric Auger , Sebastian Ott , Cornelia Huck , Shaoqin Huang , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Paolo Bonzini , Shuah Khan , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH v1 2/2] KVM: arm64: Allow the RAS feature bit in ID_AA64PFR0_EL1 writable from userspace Date: Wed, 25 Sep 2024 23:22:40 -0400 Message-Id: <20240926032244.3666579-3-shahuang@redhat.com> In-Reply-To: <20240926032244.3666579-1-shahuang@redhat.com> References: <20240926032244.3666579-1-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 10.30.177.17 Content-Type: text/plain; charset="utf-8" Currently FEAT_RAS is not writable, this makes migration fail between systems where this feature differ. Allow the FEAT_RAS writable in ID_AA64PFR0_EL1 to let the migration possible when the RAS is differ between two machines. Also update the kselftest to test the RAS field. Signed-off-by: Shaoqin Huang --- arch/arm64/kvm/sys_regs.c | 1 - tools/testing/selftests/kvm/aarch64/set_id_regs.c | 1 + 2 files changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index b09f8ba3525b..51ff66a11793 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2364,7 +2364,6 @@ static const struct sys_reg_desc sys_reg_descs[] =3D { .val =3D ~(ID_AA64PFR0_EL1_AMU | ID_AA64PFR0_EL1_MPAM | ID_AA64PFR0_EL1_SVE | - ID_AA64PFR0_EL1_RAS | ID_AA64PFR0_EL1_GIC | ID_AA64PFR0_EL1_AdvSIMD | ID_AA64PFR0_EL1_FP), }, diff --git a/tools/testing/selftests/kvm/aarch64/set_id_regs.c b/tools/test= ing/selftests/kvm/aarch64/set_id_regs.c index d20981663831..d2dd78ce0e02 100644 --- a/tools/testing/selftests/kvm/aarch64/set_id_regs.c +++ b/tools/testing/selftests/kvm/aarch64/set_id_regs.c @@ -126,6 +126,7 @@ static const struct reg_ftr_bits ftr_id_aa64pfr0_el1[] = =3D { REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, CSV2, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, DIT, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, SEL2, 0), + REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, RAS, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, EL3, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, EL2, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64PFR0_EL1, EL1, 0), --=20 2.40.1