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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 11 Jul 2019 21:17:15 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6BKHErw49217562 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 11 Jul 2019 20:17:14 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4BFD152052; Thu, 11 Jul 2019 20:17:14 +0000 (GMT) Received: from rapoport-lnx (unknown [9.148.204.152]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 2AD435205A; Thu, 11 Jul 2019 20:17:09 +0000 (GMT) Date: Thu, 11 Jul 2019 23:17:07 +0300 From: Mike Rapoport To: Andi Kleen Cc: Alexandre Chartre , pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com Subject: Re: [RFC v2 02/26] mm/asi: Abort isolation on interrupt, exception and context switch References: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com> <1562855138-19507-3-git-send-email-alexandre.chartre@oracle.com> <874l3sz5z4.fsf@firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <874l3sz5z4.fsf@firstfloor.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-TM-AS-GCONF: 00 x-cbid: 19071120-0012-0000-0000-00000331E9C1 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19071120-0013-0000-0000-0000216B57DD Message-Id: <20190711201706.GB20140@rapoport-lnx> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-11_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=960 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907110224 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 11, 2019 at 01:11:43PM -0700, Andi Kleen wrote: > Alexandre Chartre writes: > > jmp paranoid_exit > > @@ -1182,6 +1196,16 @@ ENTRY(paranoid_entry) > > xorl %ebx, %ebx > > > > 1: > > +#ifdef CONFIG_ADDRESS_SPACE_ISOLATION > > + /* > > + * If address space isolation is active then abort it and return > > + * the original kernel CR3 in %r14. > > + */ > > + ASI_START_ABORT_ELSE_JUMP 2f > > + movq %rdi, %r14 > > + ret > > +2: > > +#endif > > Unless I missed it you don't map the exception stacks into ASI, so it > has likely already triple faulted at this point. The exception stacks are in the CPU entry area, aren't they? > -Andi > -- Sincerely yours, Mike.