Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753885Ab2JPMKV (ORCPT ); Tue, 16 Oct 2012 08:10:21 -0400 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:32919 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752155Ab2JPMKT (ORCPT ); Tue, 16 Oct 2012 08:10:19 -0400 Message-ID: <507D4EA4.5050905@linux.vnet.ibm.com> Date: Tue, 16 Oct 2012 20:10:12 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Xiao Guangrong CC: Avi Kivity , Marcelo Tosatti , LKML , KVM Subject: [PATCH v5 5/6] KVM: MMU: introduce FNAME(prefetch_gpte) References: <507D4DE7.5080708@linux.vnet.ibm.com> In-Reply-To: <507D4DE7.5080708@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12101612-5490-0000-0000-0000024B9AAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3440 Lines: 111 The only difference between FNAME(update_pte) and FNAME(pte_prefetch) is that the former is allowed to prefetch gfn from dirty logged slot, so introduce a common function to prefetch spte Signed-off-by: Xiao Guangrong --- arch/x86/kvm/paging_tmpl.h | 55 +++++++++++++++++++------------------------ 1 files changed, 24 insertions(+), 31 deletions(-) diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 36a80ed..f887e4c 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -305,31 +305,43 @@ static int FNAME(walk_addr_nested)(struct guest_walker *walker, addr, access); } -static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, - u64 *spte, const void *pte) +static bool +FNAME(prefetch_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, + u64 *spte, pt_element_t gpte, bool no_dirty_log) { - pt_element_t gpte; unsigned pte_access; + gfn_t gfn; pfn_t pfn; - gpte = *(const pt_element_t *)pte; if (prefetch_invalid_gpte(vcpu, sp, spte, gpte)) - return; + return false; pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte); + + gfn = gpte_to_gfn(gpte); pte_access = sp->role.access & gpte_access(vcpu, gpte); protect_clean_gpte(&pte_access, gpte); - pfn = gfn_to_pfn_atomic(vcpu->kvm, gpte_to_gfn(gpte)); + pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn, + no_dirty_log && (pte_access & ACC_WRITE_MASK)); if (is_invalid_pfn(pfn)) - return; + return false; /* - * we call mmu_set_spte() with host_writable = true because that - * vcpu->arch.update_pte.pfn was fetched from get_user_pages(write = 1). + * we call mmu_set_spte() with host_writable = true because + * pte_prefetch_gfn_to_pfn always gets a writable pfn. */ mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0, - NULL, PT_PAGE_TABLE_LEVEL, - gpte_to_gfn(gpte), pfn, true, true); + NULL, PT_PAGE_TABLE_LEVEL, gfn, pfn, true, true); + + return true; +} + +static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, + u64 *spte, const void *pte) +{ + pt_element_t gpte = *(const pt_element_t *)pte; + + FNAME(prefetch_gpte)(vcpu, sp, spte, gpte, false); } static bool FNAME(gpte_changed)(struct kvm_vcpu *vcpu, @@ -375,33 +387,14 @@ static void FNAME(pte_prefetch)(struct kvm_vcpu *vcpu, struct guest_walker *gw, spte = sp->spt + i; for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { - pt_element_t gpte; - unsigned pte_access; - gfn_t gfn; - pfn_t pfn; - if (spte == sptep) continue; if (is_shadow_present_pte(*spte)) continue; - gpte = gptep[i]; - - if (prefetch_invalid_gpte(vcpu, sp, spte, gpte)) - continue; - - pte_access = sp->role.access & gpte_access(vcpu, gpte); - protect_clean_gpte(&pte_access, gpte); - gfn = gpte_to_gfn(gpte); - pfn = pte_prefetch_gfn_to_pfn(vcpu, gfn, - pte_access & ACC_WRITE_MASK); - if (is_invalid_pfn(pfn)) + if (!FNAME(prefetch_gpte)(vcpu, sp, spte, gptep[i], true)) break; - - mmu_set_spte(vcpu, spte, sp->role.access, pte_access, 0, 0, - NULL, PT_PAGE_TABLE_LEVEL, gfn, - pfn, true, true); } } -- 1.7.7.6 -- 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/