From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933576AbaH0KQq (ORCPT ); Wed, 27 Aug 2014 06:16:46 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:50793 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755288AbaH0KQo (ORCPT ); Wed, 27 Aug 2014 06:16:44 -0400 X-IronPort-AV: E=Sophos;i="5.04,409,1406563200"; d="scan'208";a="35139128" From: Tang Chen To: , , , CC: , , , , , Subject: [PATCH v4 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Date: Wed, 27 Aug 2014 18:17:35 +0800 Message-ID: <1409134661-27916-1-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.9.3 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ept identity pagetable and apic access page in kvm are pinned in memory. As a result, they cannot be migrated/hot-removed. But actually they don't need to be pinned in memory. [For ept identity page] Just do not pin it. When it is migrated, guest will be able to find the new page in the next ept violation. [For apic access page] The hpa of apic access page is stored in VMCS APIC_ACCESS_ADDR pointer. When apic access page is migrated, we update VMCS APIC_ACCESS_ADDR pointer for each vcpu in addition. NOTE: Tested with -cpu xxx,-x2apic option. But since nested vm pins some other pages in memory, if user uses nested vm, memory hot-remove will not work. Change log v3 -> v4: 1. The original patch 6 is now patch 5. ( by Jan Kiszka ) 2. The original patch 1 is now patch 6 since we should unpin apic access page at the very last moment. Tang Chen (6): kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic access page address. kvm: Remove ept_identity_pagetable from struct kvm_arch. kvm: Make init_rmode_identity_map() return 0 on success. kvm, mem-hotplug: Reload L1' apic access page on migration in vcpu_enter_guest(). kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is running. kvm, mem-hotplug: Do not pin apic access page in memory. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +++++- arch/x86/kvm/vmx.c | 103 +++++++++++++++++++++++++++------------- arch/x86/kvm/x86.c | 22 +++++++-- include/linux/kvm_host.h | 3 ++ virt/kvm/kvm_main.c | 30 +++++++++++- 6 files changed, 135 insertions(+), 41 deletions(-) -- 1.8.3.1