From patchwork Tue Sep 22 23:24:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kirti Wankhede X-Patchwork-Id: 11793643 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2D92392C for ; Wed, 23 Sep 2020 00:15:05 +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 E032F2076B for ; Wed, 23 Sep 2020 00:15:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="FMCMpsn2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E032F2076B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:50480 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kKsR5-0000fp-Qy for patchwork-qemu-devel@patchwork.kernel.org; Tue, 22 Sep 2020 20:15:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47246) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kKsGh-0004zu-7C for qemu-devel@nongnu.org; Tue, 22 Sep 2020 20:04:20 -0400 Received: from hqnvemgate26.nvidia.com ([216.228.121.65]:14576) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kKsGa-0001Ft-FI for qemu-devel@nongnu.org; Tue, 22 Sep 2020 20:04:16 -0400 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Tue, 22 Sep 2020 16:58:54 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 22 Sep 2020 23:58:58 +0000 Received: from kwankhede-dev.nvidia.com (10.124.1.5) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 22 Sep 2020 23:58:50 +0000 From: Kirti Wankhede To: , Subject: [PATCH v26 15/17] vfio: Add ioctl to get dirty pages bitmap during dma unmap. Date: Wed, 23 Sep 2020 04:54:17 +0530 Message-ID: <1600817059-26721-16-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1600817059-26721-1-git-send-email-kwankhede@nvidia.com> References: <1600817059-26721-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1600819134; bh=nTr15cRb6GSma9DjbXdPuJ6ztZZMoYN/ekEt+Mzxqj4=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:X-NVConfidentiality:MIME-Version:Content-Type; b=FMCMpsn2umsQXiV8H/8XEWgoXCxIoNYZMR1lx6i/HC+5hdBUT6VFIUlTlqSWARPno InvattLv3FNtR3+xW4ScgwnJ6e7U57qeSs0zQF1tO2HiE2C8ClB59pxpmoW1uOcbuE p0BR5hcpuToMoV7NN269VuJ5lCtReWqSTu+QYwteAHxgbfoiIfas9w/0nNV6FOadm6 jdq6qhI2NZpkL/UQex8QUQrWSaW1wZkyXn2iqtM17vI6OyrvF3W4VXo4+aoRmYb8nn ASIhMn3Ojuo3nVnV29B90Xd4NMtJkqlnojfg/t/+UpYdZQ4azYqWbmuKCBt7x33ljq 0AXSlil+QF3bA== Received-SPF: pass client-ip=216.228.121.65; envelope-from=kwankhede@nvidia.com; helo=hqnvemgate26.nvidia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 19:57:16 X-ACL-Warn: Detected OS = Windows 7 or 8 [fuzzy] X-Spam_score_int: -85 X-Spam_score: -8.6 X-Spam_bar: -------- X-Spam_report: (-8.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_HI=-5, 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: cohuck@redhat.com, aik@ozlabs.ru, Zhengxiao.zx@Alibaba-inc.com, shuangtai.tst@alibaba-inc.com, qemu-devel@nongnu.org, peterx@redhat.com, Kirti Wankhede , eauger@redhat.com, yi.l.liu@intel.com, quintela@redhat.com, ziye.yang@intel.com, armbru@redhat.com, mlevitsk@redhat.com, pasic@linux.ibm.com, felipe@nutanix.com, zhi.a.wang@intel.com, kevin.tian@intel.com, yan.y.zhao@intel.com, dgilbert@redhat.com, changpeng.liu@intel.com, eskultet@redhat.com, Ken.Xue@amd.com, jonathan.davies@nutanix.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" With vIOMMU, IO virtual address range can get unmapped while in pre-copy phase of migration. In that case, unmap ioctl should return pages pinned in that range and QEMU should find its correcponding guest physical addresses and report those dirty. Suggested-by: Alex Williamson Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- Note: Comments from v25 for this patch are not addressed in this series. https://www.mail-archive.com/qemu-devel@nongnu.org/msg714646.html Need to investigate more on the points raised in previous version. hw/vfio/common.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 86 insertions(+), 4 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index c36f275951c4..7eeaa368187a 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -315,11 +315,88 @@ static bool vfio_devices_all_stopped_and_saving(VFIOContainer *container) return true; } +static bool vfio_devices_all_running_and_saving(VFIOContainer *container) +{ + VFIOGroup *group; + VFIODevice *vbasedev; + MigrationState *ms = migrate_get_current(); + + if (!migration_is_setup_or_active(ms->state)) { + return false; + } + + QLIST_FOREACH(group, &container->group_list, container_next) { + QLIST_FOREACH(vbasedev, &group->device_list, next) { + if ((vbasedev->device_state & VFIO_DEVICE_STATE_SAVING) && + (vbasedev->device_state & VFIO_DEVICE_STATE_RUNNING)) { + continue; + } else { + return false; + } + } + } + return true; +} + +static int vfio_dma_unmap_bitmap(VFIOContainer *container, + hwaddr iova, ram_addr_t size, + IOMMUTLBEntry *iotlb) +{ + struct vfio_iommu_type1_dma_unmap *unmap; + struct vfio_bitmap *bitmap; + uint64_t pages = TARGET_PAGE_ALIGN(size) >> TARGET_PAGE_BITS; + int ret; + + unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap)); + + unmap->argsz = sizeof(*unmap) + sizeof(*bitmap); + unmap->iova = iova; + unmap->size = size; + unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP; + bitmap = (struct vfio_bitmap *)&unmap->data; + + /* + * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of + * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap_pgsize to + * TARGET_PAGE_SIZE. + */ + + bitmap->pgsize = TARGET_PAGE_SIZE; + bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / + BITS_PER_BYTE; + + if (bitmap->size > container->max_dirty_bitmap_size) { + error_report("UNMAP: Size of bitmap too big 0x%llx", bitmap->size); + ret = -E2BIG; + goto unmap_exit; + } + + bitmap->data = g_try_malloc0(bitmap->size); + if (!bitmap->data) { + ret = -ENOMEM; + goto unmap_exit; + } + + ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap); + if (!ret) { + cpu_physical_memory_set_dirty_lebitmap((uint64_t *)bitmap->data, + iotlb->translated_addr, pages); + } else { + error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m"); + } + + g_free(bitmap->data); +unmap_exit: + g_free(unmap); + return ret; +} + /* * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 */ static int vfio_dma_unmap(VFIOContainer *container, - hwaddr iova, ram_addr_t size) + hwaddr iova, ram_addr_t size, + IOMMUTLBEntry *iotlb) { struct vfio_iommu_type1_dma_unmap unmap = { .argsz = sizeof(unmap), @@ -328,6 +405,11 @@ static int vfio_dma_unmap(VFIOContainer *container, .size = size, }; + if (iotlb && container->dirty_pages_supported && + vfio_devices_all_running_and_saving(container)) { + return vfio_dma_unmap_bitmap(container, iova, size, iotlb); + } + while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { /* * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c @@ -375,7 +457,7 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr iova, * the VGA ROM space. */ if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || - (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 && + (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 && ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { return 0; } @@ -546,7 +628,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) } } - ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1); + ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb); if (ret) { error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " "0x%"HWADDR_PRIx") = %d (%m)", @@ -857,7 +939,7 @@ static void vfio_listener_region_del(MemoryListener *listener, } if (try_unmap) { - ret = vfio_dma_unmap(container, iova, int128_get64(llsize)); + ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); if (ret) { error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " "0x%"HWADDR_PRIx") = %d (%m)",