From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33097) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1axqlU-0007jm-09 for qemu-devel@nongnu.org; Wed, 04 May 2016 02:58:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1axql8-0006vJ-Fb for qemu-devel@nongnu.org; Wed, 04 May 2016 02:58:26 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:57652) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1axql7-0006rH-KA for qemu-devel@nongnu.org; Wed, 04 May 2016 02:58:10 -0400 Received: from localhost by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 4 May 2016 16:57:50 +1000 From: Alexey Kardashevskiy Date: Wed, 4 May 2016 16:52:30 +1000 Message-Id: <1462344751-28281-19-git-send-email-aik@ozlabs.ru> In-Reply-To: <1462344751-28281-1-git-send-email-aik@ozlabs.ru> References: <1462344751-28281-1-git-send-email-aik@ozlabs.ru> Subject: [Qemu-devel] [PATCH qemu v16 18/19] vfio/spapr: Create DMA window dynamically (SPAPR IOMMU v2) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Alexey Kardashevskiy , qemu-ppc@nongnu.org, Alexander Graf , David Gibson , Alex Williamson , Paolo Bonzini New VFIO_SPAPR_TCE_v2_IOMMU type supports dynamic DMA window management. This adds ability to VFIO common code to dynamically allocate/remove DMA windows in the host kernel when new VFIO container is added/removed. This adds VFIO_IOMMU_SPAPR_TCE_CREATE ioctl to vfio_listener_region_add and adds just created IOMMU into the host IOMMU list; the opposite action is taken in vfio_listener_region_del. When creating a new window, this uses heuristic to decide on the TCE table levels number. This should cause no guest visible change in behavior. Signed-off-by: Alexey Kardashevskiy --- Changes: v16: * used memory_region_iommu_get_page_sizes() in vfio_listener_region_add() * enforced no intersections between windows v14: * new to the series --- hw/vfio/common.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++----- trace-events | 2 + 2 files changed, 125 insertions(+), 10 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 03daf88..bd2dee8 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -240,6 +240,18 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr iova, return -errno; } +static bool range_contains(hwaddr start, hwaddr end, hwaddr addr) +{ + return start <= addr && addr <= end; +} + +static bool vfio_host_win_intersects(VFIOHostDMAWindow *hostwin, + hwaddr min_iova, hwaddr max_iova) +{ + return range_contains(hostwin->min_iova, hostwin->min_iova, min_iova) || + range_contains(min_iova, max_iova, hostwin->min_iova); +} + static VFIOHostDMAWindow *vfio_host_win_lookup(VFIOContainer *container, hwaddr min_iova, hwaddr max_iova) { @@ -279,6 +291,14 @@ static int vfio_host_win_add(VFIOContainer *container, return 0; } +static void vfio_host_win_del(VFIOContainer *container, hwaddr min_iova) +{ + VFIOHostDMAWindow *hostwin = vfio_host_win_lookup(container, min_iova, 1); + + g_assert(hostwin); + QLIST_REMOVE(hostwin, hostwin_next); +} + static bool vfio_listener_skipped_section(MemoryRegionSection *section) { return (!memory_region_is_ram(section->mr) && @@ -392,6 +412,69 @@ static void vfio_listener_region_add(MemoryListener *listener, } end = int128_get64(int128_sub(llend, int128_one())); + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { + VFIOHostDMAWindow *hostwin; + unsigned pagesizes = memory_region_iommu_get_page_sizes(section->mr); + unsigned pagesize = (hwaddr)1 << ctz64(pagesizes); + unsigned entries, pages; + struct vfio_iommu_spapr_tce_create create = { .argsz = sizeof(create) }; + + trace_vfio_listener_region_add_iommu(iova, end); + /* + * FIXME: For VFIO iommu types which have KVM acceleration to + * avoid bouncing all map/unmaps through qemu this way, this + * would be the right place to wire that up (tell the KVM + * device emulation the VFIO iommu handles to use). + */ + create.window_size = int128_get64(section->size); + create.page_shift = ctz64(pagesize); + /* + * SPAPR host supports multilevel TCE tables, there is some + * heuristic to decide how many levels we want for our table: + * 0..64 = 1; 65..4096 = 2; 4097..262144 = 3; 262145.. = 4 + */ + entries = create.window_size >> create.page_shift; + pages = MAX((entries * sizeof(uint64_t)) / getpagesize(), 1); + pages = MAX(pow2ceil(pages) - 1, 1); /* Round up */ + create.levels = ctz64(pages) / 6 + 1; + + /* For now intersections are not allowed, we may relax this later */ + QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { + if (vfio_host_win_intersects(hostwin, + section->offset_within_address_space, + section->offset_within_address_space + + create.window_size - 1)) { + goto fail; + } + } + + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create); + if (ret) { + error_report("Failed to create a window, ret = %d (%m)", ret); + goto fail; + } + + if (create.start_addr != section->offset_within_address_space) { + struct vfio_iommu_spapr_tce_remove remove = { + .argsz = sizeof(remove), + .start_addr = create.start_addr + }; + error_report("Host doesn't support DMA window at %"HWADDR_PRIx", must be %"PRIx64, + section->offset_within_address_space, + create.start_addr); + ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); + ret = -EINVAL; + goto fail; + } + trace_vfio_spapr_create_window(create.page_shift, + create.window_size, + create.start_addr); + + vfio_host_win_add(container, create.start_addr, + create.start_addr + create.window_size - 1, + 1ULL << create.page_shift); + } + if (!vfio_host_win_lookup(container, iova, end)) { error_report("vfio: IOMMU container %p can't map guest IOVA region" " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, @@ -566,6 +649,22 @@ static void vfio_listener_region_del(MemoryListener *listener, container, iova, int128_get64(llsize), ret); } + if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { + struct vfio_iommu_spapr_tce_remove remove = { + .argsz = sizeof(remove), + .start_addr = section->offset_within_address_space, + }; + ret = ioctl(container->fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); + if (ret) { + error_report("Failed to remove window at %"PRIx64, + remove.start_addr); + } + + vfio_host_win_del(container, section->offset_within_address_space); + + trace_vfio_spapr_remove_window(remove.start_addr); + } + if (iommu && iommu->iommu_ops && iommu->iommu_ops->vfio_stop) { iommu->iommu_ops->vfio_stop(section->mr); } @@ -957,11 +1056,6 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) } } - /* - * This only considers the host IOMMU's 32-bit window. At - * some point we need to add support for the optional 64-bit - * window and dynamic windows - */ info.argsz = sizeof(info); ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); if (ret) { @@ -970,11 +1064,30 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as) goto listener_release_exit; } - /* The default table uses 4K pages */ - vfio_host_win_add(container, info.dma32_window_start, - info.dma32_window_start + - info.dma32_window_size - 1, - 0x1000); + if (v2) { + /* + * There is a default window in just created container. + * To make region_add/del simpler, we better remove this + * window now and let those iommu_listener callbacks + * create/remove them when needed. + */ + struct vfio_iommu_spapr_tce_remove remove = { + .argsz = sizeof(remove), + .start_addr = info.dma32_window_start, + }; + ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove); + if (ret) { + error_report("vfio: VFIO_IOMMU_SPAPR_TCE_REMOVE failed: %m"); + ret = -errno; + goto free_container_exit; + } + } else { + /* The default table uses 4K pages */ + vfio_host_win_add(container, info.dma32_window_start, + info.dma32_window_start + + info.dma32_window_size - 1, + 0x1000); + } } else { error_report("vfio: No available IOMMU models"); ret = -EINVAL; diff --git a/trace-events b/trace-events index d0d8615..b5419de 100644 --- a/trace-events +++ b/trace-events @@ -1739,6 +1739,8 @@ 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_ram_register(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" vfio_ram_unregister(uint64_t va, uint64_t size, int ret) "va=%"PRIx64" size=%"PRIx64" ret=%d" +vfio_spapr_create_window(int ps, uint64_t ws, uint64_t off) "pageshift=0x%x winsize=0x%"PRIx64" offset=0x%"PRIx64 +vfio_spapr_remove_window(uint64_t off) "offset=%"PRIx64 # hw/vfio/platform.c vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group #%d" -- 2.5.0.rc3