From patchwork Tue Jan 16 17:52:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 861830 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) 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 3zLdSN4Qy8z9ryQ for ; Wed, 17 Jan 2018 05:05:56 +1100 (AEDT) Received: from localhost ([::1]:52403 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ebVcQ-0004DN-MT for incoming@patchwork.ozlabs.org; Tue, 16 Jan 2018 13:05:54 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45869) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ebVP8-0000lr-Gc for qemu-devel@nongnu.org; Tue, 16 Jan 2018 12:52:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ebVP7-0003ML-BA for qemu-devel@nongnu.org; Tue, 16 Jan 2018 12:52:10 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59802) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ebVP7-0003Kb-1y for qemu-devel@nongnu.org; Tue, 16 Jan 2018 12:52:09 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0CB4B780E8; Tue, 16 Jan 2018 17:52:08 +0000 (UTC) Received: from redhat.com (ovpn-125-221.rdu2.redhat.com [10.10.125.221]) by smtp.corp.redhat.com (Postfix) with SMTP id 6968E60175; Tue, 16 Jan 2018 17:52:01 +0000 (UTC) Date: Tue, 16 Jan 2018 19:52:00 +0200 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Message-ID: <1516121887-32738-24-git-send-email-mst@redhat.com> References: <1516121887-32738-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1516121887-32738-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 16 Jan 2018 17:52:08 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL v2 23/34] vhost: Merge sections added to temporary list X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Dr. David Alan Gilbert" , Igor Mammedov Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" As sections are reported by the listener to the _nop and _add methods, add them to the temporary section list but now merge them with the previous section if the new one abuts and the backend allows. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Igor Mammedov --- docs/interop/vhost-user.txt | 2 +- hw/virtio/vhost.c | 73 ++++++++++++++++++++++++++++++++++++++------- hw/virtio/trace-events | 4 +++ 3 files changed, 68 insertions(+), 11 deletions(-) diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index 9fcf48d..a8c5623 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -551,7 +551,7 @@ Master message types Master payload: N/A Slave payload: u64 - Query how many queues the backend supports. This request should be + Query how many queue pairs the backend supports. This request should be sent only when VHOST_USER_PROTOCOL_F_MQ is set in queried protocol features by VHOST_USER_GET_PROTOCOL_FEATURES. diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 8fdd073..ff949d9 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -27,6 +27,7 @@ #include "hw/virtio/virtio-access.h" #include "migration/blocker.h" #include "sysemu/dma.h" +#include "trace.h" /* enabled until disconnected backend stabilizes */ #define _VHOST_DEBUG 1 @@ -705,14 +706,65 @@ out: return; } -static void vhost_add_section(struct vhost_dev *dev, - MemoryRegionSection *section) -{ - ++dev->n_tmp_sections; - dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, - dev->n_tmp_sections); - dev->tmp_sections[dev->n_tmp_sections - 1] = *section; - memory_region_ref(section->mr); +/* Adds the section data to the tmp_section structure. + * It relies on the listener calling us in memory address order + * and for each region (via the _add and _nop methods) to + * join neighbours. + */ +static void vhost_region_add_section(struct vhost_dev *dev, + MemoryRegionSection *section) +{ + bool need_add = true; + uint64_t mrs_size = int128_get64(section->size); + uint64_t mrs_gpa = section->offset_within_address_space; + uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) + + section->offset_within_region; + + trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size, + mrs_host); + + if (dev->n_tmp_sections) { + /* Since we already have at least one section, lets see if + * this extends it; since we're scanning in order, we only + * have to look at the last one, and the FlatView that calls + * us shouldn't have overlaps. + */ + MemoryRegionSection *prev_sec = dev->tmp_sections + + (dev->n_tmp_sections - 1); + uint64_t prev_gpa_start = prev_sec->offset_within_address_space; + uint64_t prev_size = int128_get64(prev_sec->size); + uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size); + uint64_t prev_host_start = + (uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) + + prev_sec->offset_within_region; + uint64_t prev_host_end = range_get_last(prev_host_start, prev_size); + + if (prev_gpa_end + 1 == mrs_gpa && + prev_host_end + 1 == mrs_host && + section->mr == prev_sec->mr && + (!dev->vhost_ops->vhost_backend_can_merge || + dev->vhost_ops->vhost_backend_can_merge(dev, + mrs_host, mrs_size, + prev_host_start, prev_size))) { + /* The two sections abut */ + need_add = false; + prev_sec->size = int128_add(prev_sec->size, section->size); + trace_vhost_region_add_section_abut(section->mr->name, + mrs_size + prev_size); + } + } + + if (need_add) { + ++dev->n_tmp_sections; + dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections, + dev->n_tmp_sections); + dev->tmp_sections[dev->n_tmp_sections - 1] = *section; + /* The flatview isn't stable and we don't use it, making it NULL + * means we can memcmp the list. + */ + dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL; + memory_region_ref(section->mr); + } } static void vhost_region_add(MemoryListener *listener, @@ -724,11 +776,12 @@ static void vhost_region_add(MemoryListener *listener, if (!vhost_section(section)) { return; } + vhost_region_add_section(dev, section); - vhost_add_section(dev, section); vhost_set_memory(listener, section, true); } +/* Called on regions that have not changed */ static void vhost_region_nop(MemoryListener *listener, MemoryRegionSection *section) { @@ -739,7 +792,7 @@ static void vhost_region_nop(MemoryListener *listener, return; } - vhost_add_section(dev, section); + vhost_region_add_section(dev, section); } static void vhost_region_del(MemoryListener *listener, diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 775461a..ab9da06 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -1,5 +1,9 @@ # See docs/devel/tracing.txt for syntax documentation. +# hw/virtio/vhost.c +vhost_region_add_section(const char *name, uint64_t gpa, uint64_t size, uint64_t host) "%s: 0x%"PRIx64"+0x%"PRIx64" @ 0x%"PRIx64 +vhost_region_add_section_abut(const char *name, uint64_t new_size) "%s: 0x%"PRIx64 + # hw/virtio/virtio.c virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned out_num) "elem %p size %zd in_num %u out_num %u" virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"