Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753043Ab0DYHFP (ORCPT ); Sun, 25 Apr 2010 03:05:15 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:58022 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752401Ab0DYHFL (ORCPT ); Sun, 25 Apr 2010 03:05:11 -0400 Message-ID: <4BD3E8EB.1010006@cn.fujitsu.com> Date: Sun, 25 Apr 2010 15:02:03 +0800 From: Xiao Guangrong User-Agent: Thunderbird 2.0.0.24 (Windows/20100228) MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , KVM list , LKML Subject: [PATCH v2 9/10] KVM MMU: separate invlpg code form kvm_mmu_pte_write() References: <4BD3E306.4020202@cn.fujitsu.com> In-Reply-To: <4BD3E306.4020202@cn.fujitsu.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4185 Lines: 131 Let invlpg not depends on kvm_mmu_pte_write path, later patch will need this feature Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 12 +++++++----- arch/x86/kvm/paging_tmpl.h | 33 ++++++++++++++++++++++----------- 2 files changed, 29 insertions(+), 16 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 81a1945..add4658 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2291,6 +2291,13 @@ static bool is_rsvd_bits_set(struct kvm_vcpu *vcpu, u64 gpte, int level) return (gpte & vcpu->arch.mmu.rsvd_bits_mask[bit7][level-1]) != 0; } +static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, + u64 gpte); +static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, + struct kvm_mmu_page *sp, + u64 *spte, + const void *new); + #define PTTYPE 64 #include "paging_tmpl.h" #undef PTTYPE @@ -2634,12 +2641,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, int flooded = 0; int npte; int r; - int invlpg_counter; pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); - invlpg_counter = atomic_read(&vcpu->kvm->arch.invlpg_counter); - /* * Assume that the pte write on a page table of the same type * as the current vcpu paging mode. This is nearly always true @@ -2672,8 +2676,6 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, mmu_guess_page_from_pte_write(vcpu, gpa, gentry); spin_lock(&vcpu->kvm->mmu_lock); - if (atomic_read(&vcpu->kvm->arch.invlpg_counter) != invlpg_counter) - gentry = 0; kvm_mmu_access_page(vcpu, gfn); kvm_mmu_free_some_pages(vcpu); ++vcpu->kvm->stat.mmu_pte_write; diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 8eb98eb..38b4d23 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -462,11 +462,11 @@ out_unlock: static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) { + struct kvm_mmu_page *sp = NULL; struct kvm_shadow_walk_iterator iterator; - gpa_t pte_gpa = -1; - int level; - u64 *sptep; - int need_flush = 0; + gfn_t gfn = -1; + u64 *sptep = NULL, gentry; + int invlpg_counter, level, offset = 0, need_flush = 0; spin_lock(&vcpu->kvm->mmu_lock); @@ -475,8 +475,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) sptep = iterator.sptep; if (is_last_spte(*sptep, level)) { - struct kvm_mmu_page *sp = page_header(__pa(sptep)); - int offset = 0; + sp = page_header(__pa(sptep)); if (PTTYPE == 32) { if (level == PT_DIRECTORY_LEVEL) @@ -485,8 +484,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) offset = PT64_LEVEL_BITS; offset = sp->role.quadrant << offset; } - pte_gpa = (sp->gfn << PAGE_SHIFT); - pte_gpa += (sptep - sp->spt + offset) * + gfn = sp->gfn; + offset = (sptep - sp->spt + offset) * sizeof(pt_element_t); if (is_shadow_present_pte(*sptep)) { @@ -506,16 +505,28 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva) if (need_flush) kvm_flush_remote_tlbs(vcpu->kvm); - atomic_inc(&vcpu->kvm->arch.invlpg_counter); + invlpg_counter = atomic_add_return(1, &vcpu->kvm->arch.invlpg_counter); spin_unlock(&vcpu->kvm->mmu_lock); - if (pte_gpa == -1) + if (gfn == -1) return; if (mmu_topup_memory_caches(vcpu)) return; - kvm_mmu_pte_write(vcpu, pte_gpa, NULL, sizeof(pt_element_t), 0); + + kvm_read_guest_page(vcpu->kvm, gfn, &gentry, offset, + sizeof(pt_element_t)); + + mmu_guess_page_from_pte_write(vcpu, gfn_to_gpa(gfn) + offset, gentry); + spin_lock(&vcpu->kvm->mmu_lock); + if (atomic_read(&vcpu->kvm->arch.invlpg_counter) == invlpg_counter && + sp->role.level == PT_PAGE_TABLE_LEVEL) { + ++vcpu->kvm->stat.mmu_pte_updated; + FNAME(update_pte)(vcpu, sp, sptep, &gentry); + } + + spin_unlock(&vcpu->kvm->mmu_lock); } static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr, u32 access, -- 1.6.1.2 -- 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/