Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752741AbaGBI7s (ORCPT ); Wed, 2 Jul 2014 04:59:48 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:28751 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752556AbaGBI7q (ORCPT ); Wed, 2 Jul 2014 04:59:46 -0400 X-IronPort-AV: E=Sophos;i="5.00,818,1396972800"; d="scan'208";a="32730449" From: Tang Chen To: , CC: , , , , , Subject: [PATCH 0/4] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Date: Wed, 2 Jul 2014 17:00:33 +0800 Message-ID: <1404291637-15048-1-git-send-email-tangchen@cn.fujitsu.com> X-Mailer: git-send-email 1.7.11.7 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.99] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Gleb, Marcelo, Please help to review this patch-set. NOTE: This patch-set doesn't work properly. 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. This patch-set introduces two new vcpu requests: KVM_REQ_MIGRATE_EPT and KVM_REQ_MIGRATE_APIC. These two requests are made when the two pages are migrated by the mmu_notifier to reset the related variable to unusable value. And will also be made when ept violation happens to reset new pages. [Known problem] After this patch-set applied, the two pages can be migrated/hot-removed. But after migrating apic access page, the guest died. The host physical address of apic access page is stored in VMCS. I reset it to 0 to stop guest from accessing it when it is unmapped by kvm_mmu_notifier_invalidate_page(). And reset it to new page's host physical address in tdp_page_fault(). But it seems that guest will access apic page directly by the host physical address. Tang Chen (4): kvm: Add gfn_to_page_no_pin() kvm: Add macro VMX_APIC_ACCESS_PAGE_ADDR kvm, memory-hotplug: Update ept identity pagetable when it is migrated. kvm, mem-hotplug: Update apic access page when it is migrated. arch/x86/include/asm/kvm_host.h | 3 +++ arch/x86/include/asm/vmx.h | 2 +- arch/x86/kvm/mmu.c | 26 ++++++++++++++++++++++++++ arch/x86/kvm/svm.c | 3 ++- arch/x86/kvm/vmx.c | 17 +++++++++++++---- arch/x86/kvm/x86.c | 36 ++++++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 3 +++ virt/kvm/kvm_main.c | 38 +++++++++++++++++++++++++++++++++++++- 8 files changed, 121 insertions(+), 7 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/