From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757359AbaGWHmf (ORCPT ); Wed, 23 Jul 2014 03:42:35 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:48515 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752519AbaGWHmd (ORCPT ); Wed, 23 Jul 2014 03:42:33 -0400 X-IronPort-AV: E=Sophos;i="5.00,931,1396972800"; d="scan'208";a="33671753" From: Tang Chen To: , , , CC: , , , , , Subject: [PATCH v3 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Date: Wed, 23 Jul 2014 15:42:04 -0400 Message-ID: <1406144530-23002-1-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: Patch 1~5 are tested with -cpu xxx,-x2apic option, and they work well. Patch 6 is not tested yet, not sure if it is right. Change log v2 -> v3: 1. Remove original [PATCH 3/6] since ept_identity_pagetable has been removed in new [PATCH 3/6]. 2. In [PATCH 3/6], fix the problem that kvm->slots_lock does not protect kvm->arch.ept_identity_pagetable_done checking. 3. In [PATCH 3/6], drop gfn_to_page() since ept_identity_pagetable has been removed. 4. Add new [PATCH 4/6], remove redundant variable in init_rmode_identity_map(), and make it return 0 on success. 5. In [PATCH 5/6], drop put_page(kvm->arch.apic_access_page) from x86.c . 6. In [PATCH 5/6], update kvm->arch.apic_access_page in vcpu_reload_apic_access_page(). 7. Add new [PATCH 6/6], reload apic access page in L2->L1 exit. Change log v1 -> v2: 1. Add [PATCH 4/5] to remove unnecessary kvm_arch->ept_identity_pagetable. 2. In [PATCH 5/5], only introduce KVM_REQ_APIC_PAGE_RELOAD request. 3. In [PATCH 5/5], add set_apic_access_page_addr() for svm. Tang Chen (6): kvm: Add gfn_to_page_no_pin() to translate gfn to page without pinning. 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: Do not pin apic access page in memory. kvm, mem-hotplug: Reload L1's apic access page if it is migrated when L2 is running. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +++++- arch/x86/kvm/vmx.c | 108 +++++++++++++++++++++++++++------------- arch/x86/kvm/x86.c | 22 ++++++-- include/linux/kvm_host.h | 3 ++ virt/kvm/kvm_main.c | 29 ++++++++++- 6 files changed, 139 insertions(+), 41 deletions(-) -- 1.8.3.1