Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757459Ab2EVC6T (ORCPT ); Mon, 21 May 2012 22:58:19 -0400 Received: from mga14.intel.com ([143.182.124.37]:21684 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755620Ab2EVC6R (ORCPT ); Mon, 21 May 2012 22:58:17 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="102674694" Date: Tue, 22 May 2012 11:02:06 +0800 From: Xudong Hao To: Avi Kivity Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, takuya.yoshikawa@gmail.com, Xiantao Zhang , Haitao Shan , Xudong Hao Subject: [PATCH v3 4/4] Enabling Access bit when doing memory swapping Message-ID: <20120522030206.GA24827@hp-xd.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3105 Lines: 74 Enabling Access bit when doing memory swapping. Signed-off-by: Haitao Shan Signed-off-by: Xudong Hao --- arch/x86/kvm/mmu.c | 14 ++++++++------ arch/x86/kvm/vmx.c | 6 ++++-- 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 72102e0..c2fef8e 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1242,7 +1242,8 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, int young = 0; /* - * Emulate the accessed bit for EPT, by checking if this page has + * In case of absence of EPT Access and Dirty Bits supports, + * emulate the accessed bit for EPT, by checking if this page has * an EPT mapping, and clearing it if it does. On the next access, * a new EPT mapping will be established. * This has some overhead, but not as much as the cost of swapping @@ -1253,11 +1254,12 @@ static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { - BUG_ON(!(*sptep & PT_PRESENT_MASK)); + BUG_ON(!is_shadow_present_pte(*sptep)); - if (*sptep & PT_ACCESSED_MASK) { + if (*sptep & shadow_accessed_mask) { young = 1; - clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)sptep); + clear_bit((ffs(shadow_accessed_mask) - 1), + (unsigned long *)sptep); } } @@ -1281,9 +1283,9 @@ static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, for (sptep = rmap_get_first(*rmapp, &iter); sptep; sptep = rmap_get_next(&iter)) { - BUG_ON(!(*sptep & PT_PRESENT_MASK)); + BUG_ON(!is_shadow_present_pte(*sptep)); - if (*sptep & PT_ACCESSED_MASK) { + if (*sptep & shadow_accessed_mask) { young = 1; break; } diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 32eb588..ea6390e 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -7275,8 +7275,10 @@ static int __init vmx_init(void) vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false); if (enable_ept) { - kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull, - VMX_EPT_EXECUTABLE_MASK); + kvm_mmu_set_mask_ptes(0ull, + (enable_ept_ad_bits) ? VMX_EPT_ACCESS_BIT : 0ull, + (enable_ept_ad_bits) ? VMX_EPT_DIRTY_BIT : 0ull, + 0ull, VMX_EPT_EXECUTABLE_MASK); ept_set_mmio_spte_mask(); kvm_enable_tdp(); } else -- 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/