From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753489AbaIPKkg (ORCPT ); Tue, 16 Sep 2014 06:40:36 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:58727 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752933AbaIPKke (ORCPT ); Tue, 16 Sep 2014 06:40:34 -0400 X-IronPort-AV: E=Sophos;i="5.04,534,1406563200"; d="scan'208";a="36022242" From: Tang Chen To: , , , , CC: , , , , , Subject: [PATCH v6 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Date: Tue, 16 Sep 2014 18:41:56 +0800 Message-ID: <1410864122-12434-1-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 v5 -> v6: 1. Patch 1/6 has been applied by Paolo Bonzini , just resend it. 2. Simplify comment in alloc_identity_pagetable() and add a BUG_ON() in patch 2/6. 3. Move err initialization forward in patch 3/6. 4. Rename vcpu_reload_apic_access_page() to kvm_vcpu_reload_apic_access_page() and use it instead of kvm_reload_apic_access_page() in nested_vmx_vmexit() in patch 5/6. 5. Reuse kvm_vcpu_reload_apic_access_page() in prepare_vmcs02() and vmx_vcpu_reset() in patch 6/6. 6. Remove original patch 7 since we are not able to handle the situation in nested vm. 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: Unpin and remove kvm_arch->apic_access_page. arch/x86/include/asm/kvm_host.h | 5 ++- arch/x86/kvm/svm.c | 9 +++- arch/x86/kvm/vmx.c | 95 +++++++++++++++++++++++------------------ arch/x86/kvm/x86.c | 25 +++++++++-- include/linux/kvm_host.h | 2 + virt/kvm/kvm_main.c | 12 ++++++ 6 files changed, 99 insertions(+), 49 deletions(-) -- 1.8.3.1