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[134.134.136.20]) by mx.google.com with ESMTPS id g98si6061202pje.92.2019.07.11.13.11.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 11 Jul 2019 13:11:44 -0700 (PDT) Received-SPF: fail (google.com: domain of andi@firstfloor.org does not designate 134.134.136.20 as permitted sender) client-ip=134.134.136.20; Authentication-Results: mx.google.com; spf=fail (google.com: domain of andi@firstfloor.org does not designate 134.134.136.20 as permitted sender) smtp.mailfrom=andi@firstfloor.org X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2019 13:11:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,479,1557212400"; d="scan'208";a="171342617" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.137]) by orsmga006.jf.intel.com with ESMTP; 11 Jul 2019 13:11:43 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id 681A83007D3; Thu, 11 Jul 2019 13:11:43 -0700 (PDT) From: Andi Kleen To: Alexandre Chartre 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 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> Date: Thu, 11 Jul 2019 13:11:43 -0700 In-Reply-To: <1562855138-19507-3-git-send-email-alexandre.chartre@oracle.com> (Alexandre Chartre's message of "Thu, 11 Jul 2019 16:25:14 +0200") Message-ID: <874l3sz5z4.fsf@firstfloor.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain 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: 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. -Andi