From patchwork Fri Mar 11 22:59:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Williamson X-Patchwork-Id: 8570061 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1ECAFC0553 for ; Fri, 11 Mar 2016 23:02:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 33300200C6 for ; Fri, 11 Mar 2016 23:02:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 33B612026D for ; Fri, 11 Mar 2016 23:02:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933161AbcCKXCp (ORCPT ); Fri, 11 Mar 2016 18:02:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33811 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932939AbcCKW7m (ORCPT ); Fri, 11 Mar 2016 17:59:42 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 156BC804E2; Fri, 11 Mar 2016 22:59:37 +0000 (UTC) Received: from gimli.home (ovpn-113-206.phx2.redhat.com [10.3.113.206]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2BMxaDY003986; Fri, 11 Mar 2016 17:59:36 -0500 Subject: [RFC PATCH v4 2/3] vfio: Enable sparse mmap capability From: Alex Williamson To: qemu-devel@nongnu.org Cc: allen.m.kay@intel.com, kraxel@redhat.com, kvm@vger.kernel.org Date: Fri, 11 Mar 2016 15:59:36 -0700 Message-ID: <20160311225936.29918.93305.stgit@gimli.home> In-Reply-To: <20160311225120.29918.67199.stgit@gimli.home> References: <20160311225120.29918.67199.stgit@gimli.home> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The sparse mmap capability in a vfio region info allows vfio to tell us which sub-areas of a region may be mmap'd. Thus rather than assuming a single mmap covers the entire region and later frobbing it ourselves for things like the PCI MSI-X vector table, we can read that directly from vfio. Signed-off-by: Alex Williamson --- hw/vfio/common.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++--- trace-events | 2 ++ 2 files changed, 65 insertions(+), 4 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 96ccb79..879a657 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -493,6 +493,54 @@ static void vfio_listener_release(VFIOContainer *container) memory_listener_unregister(&container->listener); } +static struct vfio_info_cap_header * +vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) +{ + struct vfio_info_cap_header *hdr; + void *ptr = info; + + if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { + return NULL; + } + + for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { + if (hdr->id == id) { + return hdr; + } + } + + return NULL; +} + +static void vfio_setup_region_sparse_mmaps(VFIORegion *region, + struct vfio_region_info *info) +{ + struct vfio_info_cap_header *hdr; + struct vfio_region_info_cap_sparse_mmap *sparse; + int i; + + hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); + if (!hdr) { + return; + } + + sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); + + trace_vfio_region_sparse_mmap_header(region->vbasedev->name, + region->nr, sparse->nr_areas); + + region->nr_mmaps = sparse->nr_areas; + region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); + + for (i = 0; i < region->nr_mmaps; i++) { + region->mmaps[i].offset = sparse->areas[i].offset; + region->mmaps[i].size = sparse->areas[i].size; + trace_vfio_region_sparse_mmap_entry(i, region->mmaps[i].offset, + region->mmaps[i].offset + + region->mmaps[i].size); + } +} + int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, int index, const char *name) { @@ -519,11 +567,14 @@ int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region, region->flags & VFIO_REGION_INFO_FLAG_MMAP && !(region->size & ~qemu_real_host_page_mask)) { - region->nr_mmaps = 1; - region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); + vfio_setup_region_sparse_mmaps(region, info); - region->mmaps[0].offset = 0; - region->mmaps[0].size = region->size; + if (!region->nr_mmaps) { + region->nr_mmaps = 1; + region->mmaps = g_new0(VFIOMmap, region->nr_mmaps); + region->mmaps[0].offset = 0; + region->mmaps[0].size = region->size; + } } } @@ -1083,6 +1134,7 @@ int vfio_get_region_info(VFIODevice *vbasedev, int index, *info = g_malloc0(argsz); (*info)->index = index; +retry: (*info)->argsz = argsz; if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { @@ -1090,6 +1142,13 @@ int vfio_get_region_info(VFIODevice *vbasedev, int index, return -errno; } + if ((*info)->argsz > argsz) { + argsz = (*info)->argsz; + *info = g_realloc(*info, argsz); + + goto retry; + } + return 0; } diff --git a/trace-events b/trace-events index bf07a8f..6f679ab 100644 --- a/trace-events +++ b/trace-events @@ -1732,6 +1732,8 @@ vfio_region_mmap(const char *name, unsigned long offset, unsigned long end) "Reg vfio_region_exit(const char *name, int index) "Device %s, region %d" vfio_region_finalize(const char *name, int index) "Device %s, region %d" vfio_region_mmaps_set_enabled(const char *name, bool enabled) "Region %s mmaps enabled: %d" +vfio_region_sparse_mmap_header(const char *name, int index, int nr_areas) "Device %s region %d: %d sparse mmap entries" +vfio_region_sparse_mmap_entry(int i, off_t start, off_t end) "sparse entry %d [0x%lx - 0x%lx]" # hw/vfio/platform.c vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group #%d"