From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752032AbaIKFgq (ORCPT ); Thu, 11 Sep 2014 01:36:46 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:58644 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1750899AbaIKFgp (ORCPT ); Thu, 11 Sep 2014 01:36:45 -0400 X-IronPort-AV: E=Sophos;i="5.04,504,1406563200"; d="scan'208";a="35792862" From: Tang Chen To: , , , , CC: , , , , , Subject: [PATCH v5 0/7] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Date: Thu, 11 Sep 2014 13:37:59 +0800 Message-ID: <1410413886-32213-1-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 v4 -> v5: 1. Patch 5/7: Call kvm_reload_apic_access_page() unconditionally in nested_vmx_vmexit(). (From Gleb Natapov ) 2. Patch 6/7: Remove kvm_arch->apic_access_page. (From Gleb Natapov ) 3. Patch 7/7: Remove nested_vmx->apic_access_page. Tang Chen (7): 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: Unpin and remove kvm_arch->apic_access_page. kvm, mem-hotplug: Unpin and remove nested_vmx->apic_access_page. arch/x86/include/asm/kvm_host.h | 4 +- arch/x86/kvm/svm.c | 9 ++- arch/x86/kvm/vmx.c | 139 ++++++++++++++++++++++------------------ arch/x86/kvm/x86.c | 24 +++++-- include/linux/kvm_host.h | 2 + virt/kvm/kvm_main.c | 13 ++++ 6 files changed, 122 insertions(+), 69 deletions(-) -- 1.8.3.1