From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0BC9C04AA7 for ; Mon, 13 May 2019 16:46:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D15F2084A for ; Mon, 13 May 2019 16:46:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730837AbfEMQqc (ORCPT ); Mon, 13 May 2019 12:46:32 -0400 Received: from mga05.intel.com ([192.55.52.43]:43141 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728347AbfEMQqc (ORCPT ); Mon, 13 May 2019 12:46:32 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 May 2019 09:46:23 -0700 X-ExtLoop1: 1 Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.36]) by orsmga002.jf.intel.com with ESMTP; 13 May 2019 09:46:22 -0700 Date: Mon, 13 May 2019 09:46:22 -0700 From: Sean Christopherson To: Dave Hansen 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 Subject: Re: [RFC KVM 19/27] kvm/isolation: initialize the KVM page table with core mappings Message-ID: <20190513164622.GC28561@linux.intel.com> References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com> <1557758315-12667-20-git-send-email-alexandre.chartre@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 13, 2019 at 08:50:19AM -0700, Dave Hansen wrote: > I seem to remember that the KVM VMENTRY/VMEXIT context is very special. > Interrupts (and even NMIs?) are disabled. Would it be feasible to do > the switching in there so that we never even *get* interrupts in the KVM > context? NMIs are enabled on VMX's VM-Exit. On SVM, NMIs are blocked on exit until STGI is executed.