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Fri, 9 Oct 2020 06:40:34 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.89.116]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 9 Oct 2020 06:40:34 +0000 (GMT) From: Ganesh Goudar To: linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au Subject: [PATCH v4 1/2] powerpc/mce: remove nmi_enter/exit from real mode handler Date: Fri, 9 Oct 2020 12:10:04 +0530 Message-Id: <20201009064005.19777-2-ganeshgr@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201009064005.19777-1-ganeshgr@linux.ibm.com> References: <20201009064005.19777-1-ganeshgr@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-10-09_02:2020-10-09, 2020-10-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 spamscore=0 bulkscore=0 adultscore=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 mlxlogscore=899 impostorscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010090044 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: msuchanek@suse.de, Ganesh Goudar , keescook@chromium.org, npiggin@gmail.com, mahesh@linux.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Use of nmi_enter/exit in real mode handler causes the kernel to panic and reboot on injecting slb mutihit on pseries machine running in hash mmu mode, As these calls try to accesses memory outside RMO region in real mode handler where translation is disabled. Add check to not to use these calls on pseries machine running in hash mmu mode. Fixes: 116ac378bb3f ("powerpc/64s: machine check interrupt update NMI accounting") Signed-off-by: Ganesh Goudar --- arch/powerpc/kernel/mce.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index ada59f6c4298..63702c0badb9 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -591,12 +591,11 @@ EXPORT_SYMBOL_GPL(machine_check_print_event_info); long notrace machine_check_early(struct pt_regs *regs) { long handled = 0; - bool nested = in_nmi(); u8 ftrace_enabled = this_cpu_get_ftrace_enabled(); this_cpu_set_ftrace_enabled(0); - - if (!nested) + /* Do not use nmi_enter/exit for pseries hpte guest */ + if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR)) nmi_enter(); hv_nmi_check_nonrecoverable(regs); @@ -607,7 +606,7 @@ long notrace machine_check_early(struct pt_regs *regs) if (ppc_md.machine_check_early) handled = ppc_md.machine_check_early(regs); - if (!nested) + if (radix_enabled() || !firmware_has_feature(FW_FEATURE_LPAR)) nmi_exit(); this_cpu_set_ftrace_enabled(ftrace_enabled);