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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Sun, 22 Mar 2020 16:17:43 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02MGHgve62849250 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 22 Mar 2020 16:17:42 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 781E5AE053; Sun, 22 Mar 2020 16:17:42 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0FD96AE051; Sun, 22 Mar 2020 16:17:42 +0000 (GMT) Received: from localhost (unknown [9.85.74.144]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Sun, 22 Mar 2020 16:17:41 +0000 (GMT) Date: Sun, 22 Mar 2020 21:24:45 +0530 From: "Naveen N. Rao" Subject: Re: [PATCH v3] powerpc/kprobes: Ignore traps that happened in real mode To: Christophe Leroy , Michael Ellerman References: <424331e2006e7291a1bfe40e7f3fa58825f565e1.1582054578.git.christophe.leroy@c-s.fr> In-Reply-To: MIME-Version: 1.0 User-Agent: astroid/v0.15-13-gb675b421 (https://github.com/astroidmail/astroid) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 x-cbid: 20032216-0016-0000-0000-000002F5B752 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20032216-0017-0000-0000-000033594B8F Message-Id: <1584892419.luppysh99r.naveen@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.645 definitions=2020-03-22_05:2020-03-21, 2020-03-22 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 impostorscore=0 bulkscore=0 phishscore=0 spamscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003220094 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linuxppc-dev@lists.ozlabs.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Christophe Leroy wrote: > ping >=20 >=20 > Le 18/02/2020 =C3=A0 20:38, Christophe Leroy a =C3=A9crit=C2=A0: >> When a program check exception happens while MMU translation is >> disabled, following Oops happens in kprobe_handler() in the following >> code: >=20 > Michael, we have several traps in assembly while MMU is still disabled=20 > (TRACE_IRQFLAGS, KUAP DEBUG, syscall from kernel, machine check in RTAS,=20 > ...). > Without this fix, all of them trigger an Oops when CONFIG_KPROBE is set. For this patch: Reviewed-by: Naveen N. Rao - Naveen