From nobody Thu Oct 2 21:27:29 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 94CAE26A0A7 for ; Thu, 11 Sep 2025 11:46:25 +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=1757591188; cv=none; b=OHkzBqU6JW7COQ713cZfWVRmGvWnx2NNhxkIdSxpESyvOAxppcyF1GgvqkpKDwIx79YrUfjRHYJjgoVhBPaj7gLHgrNhhTFrEI3rMs4HIjg/wRIVj9AsYoAkAKgWMBva93bIF8SjVQI2A3ubg/zMGVyMvOi4GScjsCihnB0wqt4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757591188; c=relaxed/simple; bh=F61FcyF6cWFZvrHH/C00p0MLu0n+NSKb6gh+551RPLg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=nqUzY59lWj1RnXypBbiwqOlEIntA3VibiEJwigHdBy4uLiYi1Vb+4Onujva8pWWqRJ53Sn16w2UEak6mM9A31NuwEdHhb0LpyGZOOjdIv2+y8Ks+rlI4WoMwvGbXUxSDEWudBusPz7Cwq2OM9chkIqdWaO+GBQPC6WlKDz2Ki24= 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 [172.19.88.163]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4cMwff1FNbz24j7v; Thu, 11 Sep 2025 19:43:06 +0800 (CST) Received: from dggpemf500013.china.huawei.com (unknown [7.185.36.188]) by mail.maildlp.com (Postfix) with ESMTPS id 08FDA180042; Thu, 11 Sep 2025 19:46:23 +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; Thu, 11 Sep 2025 19:46:22 +0800 From: Jinqian Yang To: , , CC: , , , , , Subject: [PATCH v3 1/2] KVM: arm64: Make ID_AA64MMFR1_EL1.{HCX, TWED} writable from userspace Date: Thu, 11 Sep 2025 19:46:20 +0800 Message-ID: <20250911114621.3724469-2-yangjinqian1@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20250911114621.3724469-1-yangjinqian1@huawei.com> References: <20250911114621.3724469-1-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: kwepems200001.china.huawei.com (7.221.188.67) To dggpemf500013.china.huawei.com (7.185.36.188) Content-Type: text/plain; charset="utf-8" Allow userspace to downgrade {HCX, TWED} in ID_AA64MMFR1_EL1. Userspace can only change the value from high to low. Signed-off-by: Jinqian Yang --- arch/arm64/kvm/sys_regs.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 82ffb3b3b3cf..db49beb8804e 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -3002,8 +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_HCX | - ID_AA64MMFR1_EL1_TWED | ID_AA64MMFR1_EL1_XNX | ID_AA64MMFR1_EL1_VH | ID_AA64MMFR1_EL1_VMIDBits)), --=20 2.33.0