From patchwork Wed Feb 24 09:49:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12101599 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF116C433E0 for ; Wed, 24 Feb 2021 09:55:41 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3C2F3614A5 for ; Wed, 24 Feb 2021 09:55:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3C2F3614A5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:49666 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lEqtQ-0007d5-2u for qemu-devel@archiver.kernel.org; Wed, 24 Feb 2021 04:55:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:56774) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lEqoa-0002Rw-Tc for qemu-devel@nongnu.org; Wed, 24 Feb 2021 04:50:40 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:21210) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lEqoY-0007a7-Ok for qemu-devel@nongnu.org; Wed, 24 Feb 2021 04:50:40 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614160238; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rmkkhm0ffTmMwQd+jFHn8rEZGsxxDfmeSVq/4DleMLE=; b=U4uDsKC7Bq4K9FLk3MYt8odRam0JcRY96Dv8DxCaQJv5w3+xmjeu/l+USbjo9+c+Kq8VVV siplcyxMubYWl94Kdk3yUs5F+UoXLoyPuJZj6g8BjFYLnrdo6J4wrfDOUMXWam5mMfIq2H 1l/9uzrWQE1lTu/+tOPGiObQAk4NN8A= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-158-U0Z5cE9fNn2xDYGBFthO8w-1; Wed, 24 Feb 2021 04:50:36 -0500 X-MC-Unique: U0Z5cE9fNn2xDYGBFthO8w-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 42328814304; Wed, 24 Feb 2021 09:50:35 +0000 (UTC) Received: from t480s.redhat.com (ovpn-114-83.ams2.redhat.com [10.36.114.83]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1FD816F7E9; Wed, 24 Feb 2021 09:50:26 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v7 06/13] vfio: Support for RamDiscardManager in the !vIOMMU case Date: Wed, 24 Feb 2021 10:49:02 +0100 Message-Id: <20210224094910.44986-7-david@redhat.com> In-Reply-To: <20210224094910.44986-1-david@redhat.com> References: <20210224094910.44986-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Wei Yang , "Michael S . Tsirkin" , David Hildenbrand , "Dr . David Alan Gilbert" , Peter Xu , Auger Eric , Alex Williamson , teawater , Igor Mammedov , Paolo Bonzini , Marek Kedzierski Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Implement support for RamDiscardManager, to prepare for virtio-mem support. Instead of mapping the whole memory section, we only map "populated" parts and update the mapping when notified about discarding/population of memory via the RamDiscardListener. Similarly, when syncing the dirty bitmaps, sync only the actually mapped (populated) parts by replaying via the notifier. Using virtio-mem with vfio is still blocked via ram_block_discard_disable()/ram_block_discard_require() after this patch. Reviewed-by: Alex Williamson Acked-by: Alex Williamson Acked-by: Michael S. Tsirkin Cc: Paolo Bonzini Cc: "Michael S. Tsirkin" Cc: Alex Williamson Cc: Dr. David Alan Gilbert Cc: Igor Mammedov Cc: Pankaj Gupta Cc: Peter Xu Cc: Auger Eric Cc: Wei Yang Cc: teawater Cc: Marek Kedzierski Signed-off-by: David Hildenbrand --- hw/vfio/common.c | 164 ++++++++++++++++++++++++++++++++++ include/hw/vfio/vfio-common.h | 11 +++ 2 files changed, 175 insertions(+) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 6ff1daa763..5788bf6b6e 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -654,6 +654,110 @@ out: rcu_read_unlock(); } +static void vfio_ram_discard_notify_discard(RamDiscardListener *rdl, + MemoryRegionSection *section) +{ + VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener, + listener); + const hwaddr size = int128_get64(section->size); + const hwaddr iova = section->offset_within_address_space; + int ret; + + /* Unmap with a single call. */ + ret = vfio_dma_unmap(vrdl->container, iova, size , NULL); + if (ret) { + error_report("%s: vfio_dma_unmap() failed: %s", __func__, + strerror(-ret)); + } +} + +static int vfio_ram_discard_notify_populate(RamDiscardListener *rdl, + MemoryRegionSection *section) +{ + VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener, + listener); + const hwaddr end = section->offset_within_region + + int128_get64(section->size); + hwaddr start, next, iova; + void *vaddr; + int ret; + + /* + * Map in (aligned within memory region) minimum granularity, so we can + * unmap in minimum granularity later. + */ + for (start = section->offset_within_region; start < end; start = next) { + next = ROUND_UP(start + 1, vrdl->granularity); + next = MIN(next, end); + + iova = start - section->offset_within_region + + section->offset_within_address_space; + vaddr = memory_region_get_ram_ptr(section->mr) + start; + + ret = vfio_dma_map(vrdl->container, iova, next - start, + vaddr, section->readonly); + if (ret) { + /* Rollback */ + vfio_ram_discard_notify_discard(rdl, section); + return ret; + } + } + return 0; +} + +static void vfio_register_ram_discard_listener(VFIOContainer *container, + MemoryRegionSection *section) +{ + RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); + VFIORamDiscardListener *vrdl; + + /* Ignore some corner cases not relevant in practice. */ + g_assert(QEMU_IS_ALIGNED(section->offset_within_region, TARGET_PAGE_SIZE)); + g_assert(QEMU_IS_ALIGNED(section->offset_within_address_space, + TARGET_PAGE_SIZE)); + g_assert(QEMU_IS_ALIGNED(int128_get64(section->size), TARGET_PAGE_SIZE)); + + vrdl = g_new0(VFIORamDiscardListener, 1); + vrdl->container = container; + vrdl->mr = section->mr; + vrdl->offset_within_address_space = section->offset_within_address_space; + vrdl->size = int128_get64(section->size); + vrdl->granularity = ram_discard_manager_get_min_granularity(rdm, + section->mr); + + g_assert(vrdl->granularity && is_power_of_2(vrdl->granularity)); + g_assert(vrdl->granularity >= 1 << ctz64(container->pgsizes)); + + ram_discard_listener_init(&vrdl->listener, + vfio_ram_discard_notify_populate, + vfio_ram_discard_notify_discard, true); + ram_discard_manager_register_listener(rdm, &vrdl->listener, section); + QLIST_INSERT_HEAD(&container->vrdl_list, vrdl, next); +} + +static void vfio_unregister_ram_discard_listener(VFIOContainer *container, + MemoryRegionSection *section) +{ + RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); + VFIORamDiscardListener *vrdl = NULL; + + QLIST_FOREACH(vrdl, &container->vrdl_list, next) { + if (vrdl->mr == section->mr && + vrdl->offset_within_address_space == + section->offset_within_address_space) { + break; + } + } + + if (!vrdl) { + hw_error("vfio: Trying to unregister missing RAM discard listener"); + } + + ram_discard_manager_unregister_listener(rdm, &vrdl->listener); + QLIST_REMOVE(vrdl, next); + g_free(vrdl); +} + static void vfio_listener_region_add(MemoryListener *listener, MemoryRegionSection *section) { @@ -814,6 +918,16 @@ static void vfio_listener_region_add(MemoryListener *listener, /* Here we assume that memory_region_is_ram(section->mr)==true */ + /* + * For RAM memory regions with a RamDiscardManager, we only want to map the + * actually populated parts - and update the mapping whenever we're notified + * about changes. + */ + if (memory_region_has_ram_discard_manager(section->mr)) { + vfio_register_ram_discard_listener(container, section); + return; + } + vaddr = memory_region_get_ram_ptr(section->mr) + section->offset_within_region + (iova - section->offset_within_address_space); @@ -950,6 +1064,10 @@ static void vfio_listener_region_del(MemoryListener *listener, pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); + } else if (memory_region_has_ram_discard_manager(section->mr)) { + vfio_unregister_ram_discard_listener(container, section); + /* Unregistering will trigger an unmap. */ + try_unmap = false; } if (try_unmap) { @@ -1077,6 +1195,49 @@ static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) rcu_read_unlock(); } +static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section, + void *opaque) +{ + const hwaddr size = int128_get64(section->size); + const hwaddr iova = section->offset_within_address_space; + const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) + + section->offset_within_region; + VFIORamDiscardListener *vrdl = opaque; + + /* + * Sync the whole mapped region (spanning multiple individual mappings) + * in one go. + */ + return vfio_get_dirty_bitmap(vrdl->container, iova, size, ram_addr); +} + +static int vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainer *container, + MemoryRegionSection *section) +{ + RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); + VFIORamDiscardListener *vrdl = NULL; + + QLIST_FOREACH(vrdl, &container->vrdl_list, next) { + if (vrdl->mr == section->mr && + vrdl->offset_within_address_space == + section->offset_within_address_space) { + break; + } + } + + if (!vrdl) { + hw_error("vfio: Trying to sync missing RAM discard listener"); + } + + /* + * We only want/can synchronize the bitmap for actually mapped parts - + * which correspond to populated parts. Replay all populated parts. + */ + return ram_discard_manager_replay_populated(rdm, section, + vfio_ram_discard_get_dirty_bitmap, + &vrdl); +} + static int vfio_sync_dirty_bitmap(VFIOContainer *container, MemoryRegionSection *section) { @@ -1108,6 +1269,8 @@ static int vfio_sync_dirty_bitmap(VFIOContainer *container, } } return 0; + } else if (memory_region_has_ram_discard_manager(section->mr)) { + return vfio_sync_ram_discard_listener_dirty_bitmap(container, section); } ram_addr = memory_region_get_ram_addr(section->mr) + @@ -1737,6 +1900,7 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, container->dirty_pages_supported = false; QLIST_INIT(&container->giommu_list); QLIST_INIT(&container->hostwin_list); + QLIST_INIT(&container->vrdl_list); ret = vfio_init_container(container, group->fd, errp); if (ret) { diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 6141162d7a..681432213d 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -91,6 +91,7 @@ typedef struct VFIOContainer { QLIST_HEAD(, VFIOGuestIOMMU) giommu_list; QLIST_HEAD(, VFIOHostDMAWindow) hostwin_list; QLIST_HEAD(, VFIOGroup) group_list; + QLIST_HEAD(, VFIORamDiscardListener) vrdl_list; QLIST_ENTRY(VFIOContainer) next; } VFIOContainer; @@ -102,6 +103,16 @@ typedef struct VFIOGuestIOMMU { QLIST_ENTRY(VFIOGuestIOMMU) giommu_next; } VFIOGuestIOMMU; +typedef struct VFIORamDiscardListener { + VFIOContainer *container; + MemoryRegion *mr; + hwaddr offset_within_address_space; + hwaddr size; + uint64_t granularity; + RamDiscardListener listener; + QLIST_ENTRY(VFIORamDiscardListener) next; +} VFIORamDiscardListener; + typedef struct VFIOHostDMAWindow { hwaddr min_iova; hwaddr max_iova;