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Thu, 11 Jul 2019 20:42:14 +0000 Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x6BKg4ou031753; Thu, 11 Jul 2019 20:42:10 GMT Received: from [10.166.106.34] (/10.166.106.34) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 11 Jul 2019 13:42:04 -0700 Subject: Re: [RFC v2 02/26] mm/asi: Abort isolation on interrupt, exception and context switch To: Mike Rapoport , Andi Kleen Cc: 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 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> <20190711201706.GB20140@rapoport-lnx> From: Alexandre Chartre Organization: Oracle Corporation Message-ID: <09fee00d-37a6-0895-7964-0e8a2d5b17d6@oracle.com> Date: Thu, 11 Jul 2019 22:41:59 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <20190711201706.GB20140@rapoport-lnx> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9315 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907110228 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9315 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907110228 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 7/11/19 10:17 PM, Mike Rapoport wrote: > 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? > That's my understanding, stacks come from tss in the CPU entry area and the CPU entry area is part for the core ASI mappings (see patch 15/26). alex.