From patchwork Sun Aug 22 11:11:43 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 121671 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o7LB7lkl015653 for ; Sat, 21 Aug 2010 11:07:47 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751887Ab0HULH0 (ORCPT ); Sat, 21 Aug 2010 07:07:26 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:62198 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751819Ab0HULHZ (ORCPT ); Sat, 21 Aug 2010 07:07:25 -0400 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id 702CF170095; Sat, 21 Aug 2010 19:07:23 +0800 (CST) Received: from fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id o7LB45Dj000587; Sat, 21 Aug 2010 19:04:05 +0800 Received: from [10.167.141.99] (unknown [10.167.141.99]) by fnst.cn.fujitsu.com (Postfix) with ESMTPA id 4F68510C1AC; Sat, 21 Aug 2010 19:08:27 +0800 (CST) Message-ID: <4C7105EF.6050009@cn.fujitsu.com> Date: Sun, 22 Aug 2010 19:11:43 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.11) Gecko/20100713 Thunderbird/3.0.6 MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , KVM , LKML Subject: [PATCH v7 3/5] KVM: MMU: introduce gfn_to_page_many_atomic() function References: <4C710549.9090704@cn.fujitsu.com> In-Reply-To: <4C710549.9090704@cn.fujitsu.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Sat, 21 Aug 2010 11:07:48 +0000 (UTC) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 307d0e2..b837ec8 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -289,6 +289,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, void kvm_disable_largepages(void); void kvm_arch_flush_shadow(struct kvm *kvm); +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, + int nr_pages); + struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn); unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn); void kvm_release_page_clean(struct page *page); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 2dc0c18..a92469d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -927,15 +927,25 @@ int memslot_id(struct kvm *kvm, gfn_t gfn) return memslot - slots->memslots; } -unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, + gfn_t *nr_pages) { struct kvm_memory_slot *slot; slot = gfn_to_memslot(kvm, gfn); if (!slot || slot->flags & KVM_MEMSLOT_INVALID) return bad_hva(); + + if (nr_pages) + *nr_pages = slot->npages - (gfn - slot->base_gfn); + return gfn_to_hva_memslot(slot, gfn); } + +unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +{ + return gfn_to_hva_many(kvm, gfn, NULL); +} EXPORT_SYMBOL_GPL(gfn_to_hva); static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic) @@ -1010,6 +1020,23 @@ pfn_t gfn_to_pfn_memslot(struct kvm *kvm, return hva_to_pfn(kvm, addr, false); } +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, + int nr_pages) +{ + unsigned long addr; + gfn_t entry; + + addr = gfn_to_hva_many(kvm, gfn, &entry); + if (kvm_is_error_hva(addr)) + return -1; + + if (entry < nr_pages) + return 0; + + return __get_user_pages_fast(addr, nr_pages, 1, pages); +} +EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); + struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) { pfn_t pfn;