From nobody Fri Oct 3 02:17:19 2025 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (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 DEEA627602B for ; Tue, 9 Sep 2025 03:44:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757389470; cv=none; b=g+Fo4oMiT4uqdpgiWzKBCqJ4K62drQ6/XNLYToN7079OuMefp6j5fUkMlrNerDeFNCMUzNQJo/9/4l/u53WqsrT87T8Ygm0YBouFI+Gt0XGZsirvIpfMPsSQu/sPqwT6lJD07bLswCjMB2k9l4eFP0PvdejNGVjhpWsXHzsvM9I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757389470; c=relaxed/simple; bh=X2zh03U2TghY9hhDbJHHRJzRs6HpAv7+dAnTnUZs3OQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ja4eqbVHpt1kOlsL6qtWo77kG0ZAwINjYgoO6GnNJb3ah7fGd8pX4VD+2oqOxsWzx2En8h1w/PQqh5uoF0j5e3E+bJ0ObxUaV2+bYnUS02dkp/j0gqqNhKeLJiW1FwkD7MON8sQj35BY1cqV3iLUVxtw+SHxkW0uoxURduzCTVE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.214]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4cLV3P29dHz24hwr; Tue, 9 Sep 2025 11:41:05 +0800 (CST) Received: from dggpemf500013.china.huawei.com (unknown [7.185.36.188]) by mail.maildlp.com (Postfix) with ESMTPS id 2EEB31A016C; Tue, 9 Sep 2025 11:44:19 +0800 (CST) Received: from huawei.com (10.50.165.33) by dggpemf500013.china.huawei.com (7.185.36.188) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 9 Sep 2025 11:44:18 +0800 From: Jinqian Yang To: , , CC: , , , , , Subject: [PATCH v2 2/3] KVM: arm64: Make ID_AA64MMFR1_EL1.TWED writable from userspace Date: Tue, 9 Sep 2025 11:44:14 +0800 Message-ID: <20250909034415.3822478-3-yangjinqian1@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250909034415.3822478-1-yangjinqian1@huawei.com> References: <20250909034415.3822478-1-yangjinqian1@huawei.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-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To dggpemf500013.china.huawei.com (7.185.36.188) Content-Type: text/plain; charset="utf-8" Allow userspace to downgrade TWED in ID_AA64MMFR1_EL1. Userspace can only change this value from high to low. Signed-off-by: Jinqian Yang --- arch/arm64/kvm/sys_regs.c | 1 - tools/testing/selftests/kvm/arm64/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 f2267db1c44c..db49beb8804e 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -3002,7 +3002,6 @@ static const struct sys_reg_desc sys_reg_descs[] =3D { ~(ID_AA64MMFR0_EL1_RES0 | ID_AA64MMFR0_EL1_ASIDBITS)), ID_WRITABLE(ID_AA64MMFR1_EL1, ~(ID_AA64MMFR1_EL1_RES0 | - ID_AA64MMFR1_EL1_TWED | ID_AA64MMFR1_EL1_XNX | ID_AA64MMFR1_EL1_VH | ID_AA64MMFR1_EL1_VMIDBits)), diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testin= g/selftests/kvm/arm64/set_id_regs.c index a744dee30cd2..a889550d8aa4 100644 --- a/tools/testing/selftests/kvm/arm64/set_id_regs.c +++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c @@ -167,6 +167,7 @@ static const struct reg_ftr_bits ftr_id_aa64mmfr1_el1[]= =3D { REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, AFP, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, HCX, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, ETS, 0), + REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, TWED, 0), REG_FTR_BITS(FTR_HIGHER_SAFE, ID_AA64MMFR1_EL1, SpecSEI, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, PAN, 0), REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, LO, 0), --=20 2.33.0