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: 596534 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id ACA941402D9 for ; Sat, 12 Mar 2016 10:01:18 +1100 (AEDT) Received: from localhost ([::1]:58136 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aeW3Y-0000dX-MR for incoming@patchwork.ozlabs.org; Fri, 11 Mar 2016 18:01:16 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60328) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aeW21-0006LB-4k for qemu-devel@nongnu.org; Fri, 11 Mar 2016 17:59:42 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aeW1x-0006m9-U1 for qemu-devel@nongnu.org; Fri, 11 Mar 2016 17:59:41 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33931) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aeW1x-0006m5-GX for qemu-devel@nongnu.org; Fri, 11 Mar 2016 17:59:37 -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 From: Alex Williamson To: qemu-devel@nongnu.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 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: allen.m.kay@intel.com, kraxel@redhat.com, kvm@vger.kernel.org Subject: [Qemu-devel] [RFC PATCH v4 2/3] vfio: Enable sparse mmap capability X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org 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(-) 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"