Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752298AbdLLQK2 (ORCPT ); Tue, 12 Dec 2017 11:10:28 -0500 Received: from mx1.redhat.com ([209.132.183.28]:32892 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751566AbdLLQK1 (ORCPT ); Tue, 12 Dec 2017 11:10:27 -0500 Subject: Re: [PATCH v2] KVM: VMX: drop I/O permission bitmaps To: Paolo Bonzini , Quan Xu , kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, rkrcmar@redhat.com, jmattson@google.com References: <1513068261-2019-1-git-send-email-quan.xu0@gmail.com> <73c19457-52ec-3807-940a-4a38defd6849@redhat.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <047e9125-ca0a-ae0f-f71c-05255c556d32@redhat.com> Date: Tue, 12 Dec 2017 17:10:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <73c19457-52ec-3807-940a-4a38defd6849@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Tue, 12 Dec 2017 16:10:27 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 412 Lines: 22 > /* > - * Merging of IO bitmap not currently supported. > - * Rather, exit every time. > + * A vmexit (to either L1 hypervisor or L0 userspace) is always needed > + * for I/O port accesses. > */ > exec_control &= ~CPU_BASED_USE_IO_BITMAPS; > exec_control |= CPU_BASED_UNCOND_IO_EXITING; > > Thanks, > > Paolo > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb