From patchwork Tue Mar 24 21:09:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kirti Wankhede X-Patchwork-Id: 11456627 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 165391667 for ; Tue, 24 Mar 2020 21:51:33 +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 D05C32070A for ; Tue, 24 Mar 2020 21:51:32 +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="e46DUAQI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D05C32070A 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]:55706 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGrSO-0001Z5-0z for patchwork-qemu-devel@patchwork.kernel.org; Tue, 24 Mar 2020 17:51:32 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38949) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGrLO-0007xI-Ju for qemu-devel@nongnu.org; Tue, 24 Mar 2020 17:44:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jGrLN-00051F-1Z for qemu-devel@nongnu.org; Tue, 24 Mar 2020 17:44:18 -0400 Received: from hqnvemgate26.nvidia.com ([216.228.121.65]:6191) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jGrLM-000511-RZ for qemu-devel@nongnu.org; Tue, 24 Mar 2020 17:44:16 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 24 Mar 2020 14:44:02 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 24 Mar 2020 14:44:15 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 24 Mar 2020 14:44:15 -0700 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 24 Mar 2020 21:44:15 +0000 Received: from kwankhede-dev.nvidia.com (10.124.1.5) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 24 Mar 2020 21:44:08 +0000 From: Kirti Wankhede To: , Subject: [PATCH v16 QEMU 14/16] vfio: Add vfio_listener_log_sync to mark dirty pages Date: Wed, 25 Mar 2020 02:39:12 +0530 Message-ID: <1585084154-29461-15-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1585084154-29461-1-git-send-email-kwankhede@nvidia.com> References: <1585084154-29461-1-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=1585086242; bh=p0KOGL805FbEk/o7TaSs5/jMZEpVN73/mLs5xwyth/4=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=e46DUAQI0/JK1qb80hEyrzhABXccixyCaT1wwCUNCMSYTOhfbrBuqmZPLg9sE5Hls L79p3sBqZEI8dJ8YJIADOq4hI1RjzikMsUHN0G0CwwhPwBvE+9eBQGimgBcCK3YmQJ 86m9vajG124Oo++gB1Gb7FIZIA34BE4o7J6dptpnirihDeZWOFp4HTX2lP9K/8qIWZ ljDKJ6aVARtvzXbGYXv7tHJIdLf7fU8IxzDB1ebv57NYUG6j8vgvPwasY84zwPMEYb 7ZNtCGGcNjAV0z/9FP8+kMwqmRUlX4c+ZUJ9ReBcm7MylGqUiefBHkONaio761E5LZ QBePu3328NHZA== X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 216.228.121.65 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: Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, yan.y.zhao@intel.com, eskultet@redhat.com, ziye.yang@intel.com, qemu-devel@nongnu.org, cohuck@redhat.com, shuangtai.tst@alibaba-inc.com, dgilbert@redhat.com, zhi.a.wang@intel.com, mlevitsk@redhat.com, pasic@linux.ibm.com, aik@ozlabs.ru, Kirti Wankhede , eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" vfio_listener_log_sync gets list of dirty pages from container using VFIO_IOMMU_GET_DIRTY_BITMAP ioctl and mark those pages dirty when all devices are stopped and saving state. Return early for the RAM block section of mapped MMIO region. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- hw/vfio/common.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++++-- hw/vfio/trace-events | 1 + 2 files changed, 196 insertions(+), 5 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 4a2f0d6a2233..6d41e1ac5c2f 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -29,6 +29,7 @@ #include "hw/vfio/vfio.h" #include "exec/address-spaces.h" #include "exec/memory.h" +#include "exec/ram_addr.h" #include "hw/hw.h" #include "qemu/error-report.h" #include "qemu/main-loop.h" @@ -38,6 +39,7 @@ #include "sysemu/reset.h" #include "trace.h" #include "qapi/error.h" +#include "migration/migration.h" VFIOGroupList vfio_group_list = QLIST_HEAD_INITIALIZER(vfio_group_list); @@ -288,6 +290,28 @@ const MemoryRegionOps vfio_region_ops = { }; /* + * Device state interfaces + */ + +static bool vfio_devices_are_stopped_and_saving(void) +{ + VFIOGroup *group; + VFIODevice *vbasedev; + + QLIST_FOREACH(group, &vfio_group_list, 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; +} + +/* * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 */ static int vfio_dma_unmap(VFIOContainer *container, @@ -408,8 +432,8 @@ static bool vfio_listener_skipped_section(MemoryRegionSection *section) } /* Called with rcu_read_lock held. */ -static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, - bool *read_only) +static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, + ram_addr_t *ram_addr, bool *read_only) { MemoryRegion *mr; hwaddr xlat; @@ -440,9 +464,17 @@ static bool vfio_get_vaddr(IOMMUTLBEntry *iotlb, void **vaddr, return false; } - *vaddr = memory_region_get_ram_ptr(mr) + xlat; - *read_only = !writable || mr->readonly; + if (vaddr) { + *vaddr = memory_region_get_ram_ptr(mr) + xlat; + } + if (ram_addr) { + *ram_addr = memory_region_get_ram_addr(mr) + xlat; + } + + if (read_only) { + *read_only = !writable || mr->readonly; + } return true; } @@ -467,7 +499,7 @@ static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) rcu_read_lock(); if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { - if (!vfio_get_vaddr(iotlb, &vaddr, &read_only)) { + if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { goto out; } /* @@ -813,9 +845,167 @@ static void vfio_listener_region_del(MemoryListener *listener, } } +static int vfio_get_dirty_bitmap(MemoryListener *listener, + MemoryRegionSection *section) +{ + VFIOContainer *container = container_of(listener, VFIOContainer, listener); + VFIOGuestIOMMU *giommu; + IOMMUTLBEntry iotlb; + hwaddr granularity, address_limit, iova; + int ret; + + if (memory_region_is_iommu(section->mr)) { + QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { + if (MEMORY_REGION(giommu->iommu) == section->mr && + giommu->n.start == section->offset_within_region) { + break; + } + } + + if (!giommu) { + return -EINVAL; + } + } + + if (memory_region_is_iommu(section->mr)) { + granularity = memory_region_iommu_get_min_page_size(giommu->iommu); + + address_limit = MIN(int128_get64(section->size), + memory_region_iommu_get_address_limit(giommu->iommu, + int128_get64(section->size))); + } else { + granularity = memory_region_size(section->mr); + address_limit = int128_get64(section->size); + } + + iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); + + RCU_READ_LOCK_GUARD(); + + while (iova < address_limit) { + struct vfio_iommu_type1_dirty_bitmap *dbitmap; + struct vfio_iommu_type1_dirty_bitmap_get *range; + ram_addr_t start, pages; + uint64_t iova_xlat, size; + + if (memory_region_is_iommu(section->mr)) { + iotlb = address_space_get_iotlb_entry(container->space->as, iova, + true, MEMTXATTRS_UNSPECIFIED); + if ((iotlb.target_as == NULL) || (iotlb.addr_mask == 0)) { + if ((iova + granularity) < iova) { + break; + } + iova += granularity; + continue; + } + iova_xlat = iotlb.iova + giommu->iommu_offset; + size = iotlb.addr_mask + 1; + } else { + iova_xlat = iova; + size = address_limit; + } + + dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range)); + if (!dbitmap) { + return -ENOMEM; + } + + dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range); + dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP; + range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data; + range->iova = iova_xlat; + range->size = size; + + /* + * cpu_physical_memory_set_dirty_lebitmap() expects pages in bitmap of + * TARGET_PAGE_SIZE to mark those dirty. Hence set bitmap's pgsize to + * TARGET_PAGE_SIZE. + */ + range->bitmap.pgsize = TARGET_PAGE_SIZE; + + /* + * Comment from kvm_physical_sync_dirty_bitmap() since same applies here + * XXX bad kernel interface alert + * For dirty bitmap, kernel allocates array of size aligned to + * bits-per-long. But for case when the kernel is 64bits and + * the userspace is 32bits, userspace can't align to the same + * bits-per-long, since sizeof(long) is different between kernel + * and user space. This way, userspace will provide buffer which + * may be 4 bytes less than the kernel will use, resulting in + * userspace memory corruption (which is not detectable by valgrind + * too, in most cases). + * So for now, let's align to 64 instead of HOST_LONG_BITS here, in + * a hope that sizeof(long) won't become >8 any time soon. + */ + + pages = TARGET_PAGE_ALIGN(range->size) >> TARGET_PAGE_BITS; + range->bitmap.size = ROUND_UP(pages, 64) / 8; + range->bitmap.data = g_malloc0(range->bitmap.size); + if (range->bitmap.data == NULL) { + error_report("Error allocating bitmap of size 0x%llx", + range->bitmap.size); + ret = -ENOMEM; + goto err_out; + } + + ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap); + if (ret) { + error_report("Failed to get dirty bitmap for iova: 0x%llx " + "size: 0x%llx err: %d", + range->iova, range->size, errno); + goto err_out; + } + + if (memory_region_is_iommu(section->mr)) { + if (!vfio_get_xlat_addr(&iotlb, NULL, &start, NULL)) { + ret = -EINVAL; + goto err_out; + } + } else { + start = memory_region_get_ram_addr(section->mr) + + section->offset_within_region + iova - + TARGET_PAGE_ALIGN(section->offset_within_address_space); + } + + cpu_physical_memory_set_dirty_lebitmap((uint64_t *)range->bitmap.data, + start, pages); + + trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size, + range->bitmap.size, start); +err_out: + g_free(range->bitmap.data); + g_free(dbitmap); + + if (ret) { + return ret; + } + + if ((iova + size) < iova) { + break; + } + + iova += size; + } + + return 0; +} + +static void vfio_listerner_log_sync(MemoryListener *listener, + MemoryRegionSection *section) +{ + if (vfio_listener_skipped_section(section)) { + return; + } + + if (vfio_devices_are_stopped_and_saving()) { + vfio_get_dirty_bitmap(listener, section); + } +} + static const MemoryListener vfio_memory_listener = { .region_add = vfio_listener_region_add, .region_del = vfio_listener_region_del, + .log_sync = vfio_listerner_log_sync, }; static void vfio_listener_release(VFIOContainer *container) diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index ac065b559f4e..bc8f35ee9356 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -160,3 +160,4 @@ vfio_save_complete_precopy(char *name) " (%s)" vfio_load_device_config_state(char *name) " (%s)" vfio_load_state(char *name, uint64_t data) " (%s) data 0x%"PRIx64 vfio_load_state_device_data(char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64 +vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64