From patchwork Mon Jan 15 17:03:10 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudio Imbrenda X-Patchwork-Id: 10164841 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1CBCB602C2 for ; Mon, 15 Jan 2018 17:03:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 09A08201F3 for ; Mon, 15 Jan 2018 17:03:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F1F3D20223; Mon, 15 Jan 2018 17:03:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8045E201F3 for ; Mon, 15 Jan 2018 17:03:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934820AbeAORDT (ORCPT ); Mon, 15 Jan 2018 12:03:19 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:43672 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934613AbeAORDS (ORCPT ); Mon, 15 Jan 2018 12:03:18 -0500 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w0FH0lOg049701 for ; Mon, 15 Jan 2018 12:03:18 -0500 Received: from e06smtp14.uk.ibm.com (e06smtp14.uk.ibm.com [195.75.94.110]) by mx0a-001b2d01.pphosted.com with ESMTP id 2fgwn6fwgk-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 15 Jan 2018 12:03:17 -0500 Received: from localhost by e06smtp14.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 15 Jan 2018 17:03:13 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w0FH3Dgb1311110; Mon, 15 Jan 2018 17:03:13 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1404642047; Mon, 15 Jan 2018 16:56:42 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3BAA4204B; Mon, 15 Jan 2018 16:56:41 +0000 (GMT) Received: from p-imbrenda.boeblingen.de.ibm.com (unknown [9.152.224.212]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Mon, 15 Jan 2018 16:56:41 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: borntraeger@de.ibm.com, cohuck@redhat.com, pbonzini@redhat.com, david@redhat.com, schwidefsky@de.ibm.com Subject: [PATCH v1 1/2] KVM: s390x: some utility functions for migration Date: Mon, 15 Jan 2018 18:03:10 +0100 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1516035791-10609-1-git-send-email-imbrenda@linux.vnet.ibm.com> References: <1516035791-10609-1-git-send-email-imbrenda@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18011517-0016-0000-0000-00000517F5F5 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18011517-0017-0000-0000-000028546418 Message-Id: <1516035791-10609-2-git-send-email-imbrenda@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-01-15_08:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1801150240 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP These are some utilty functions that will be used later on for storage attributes migration. Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/kvm-s390.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 6f17031..100ea15 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -764,6 +764,14 @@ static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) kvm_s390_sync_request(req, vcpu); } +static inline unsigned long *_cmma_bitmap(struct kvm_memory_slot *ms) +{ + unsigned long long len; + + len = kvm_dirty_bitmap_bytes(ms) / sizeof(*ms->dirty_bitmap); + return ms->dirty_bitmap + len; +} + /* * Must be called with kvm->srcu held to avoid races on memslots, and with * kvm->lock to avoid races with ourselves and kvm_s390_vm_stop_migration. @@ -1512,6 +1520,38 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX) /* + * Similar to gfn_to_memslot, but returns a memslot also when the address falls + * in a hole. In that case a memslot near the hole is returned. + */ +static int gfn_to_memslot_approx(struct kvm *kvm, gfn_t gfn) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + int start = 0, end = slots->used_slots; + int slot = atomic_read(&slots->lru_slot); + struct kvm_memory_slot *memslots = slots->memslots; + + if (gfn >= memslots[slot].base_gfn && + gfn < memslots[slot].base_gfn + memslots[slot].npages) + return slot; + + while (start < end) { + slot = start + (end - start) / 2; + + if (gfn >= memslots[slot].base_gfn) + end = slot; + else + start = slot + 1; + } + + if (gfn >= memslots[start].base_gfn && + gfn < memslots[start].base_gfn + memslots[start].npages) { + atomic_set(&slots->lru_slot, start); + } + + return start; +} + +/* * This function searches for the next page with dirty CMMA attributes, and * saves the attributes in the buffer up to either the end of the buffer or * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;