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Berrange" , Eduardo Habkost , Eric Blake , Markus Armbruster , Jason Gunthorpe , Avihai Horon , Joao Martins Subject: [PATCH RFCv2 5/8] vfio/iommufd: Implement VFIOIOMMUClass::query_dirty_bitmap support Date: Mon, 12 Feb 2024 13:56:40 +0000 Message-Id: <20240212135643.5858-6-joao.m.martins@oracle.com> In-Reply-To: <20240212135643.5858-1-joao.m.martins@oracle.com> References: <20240212135643.5858-1-joao.m.martins@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-12_10,2024-02-12_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 mlxscore=0 spamscore=0 suspectscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402120105 X-Proofpoint-GUID: ylsCExZkejUxexDwlQQ0CDPDCC0cXTXX X-Proofpoint-ORIG-GUID: ylsCExZkejUxexDwlQQ0CDPDCC0cXTXX Received-SPF: pass client-ip=205.220.177.32; envelope-from=joao.m.martins@oracle.com; helo=mx0b-00069f02.pphosted.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_MED=-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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org ioctl(iommufd, IOMMU_HWPT_GET_DIRTY_BITMAP, arg) is the UAPI that fetches the bitmap that tells what was dirty in an IOVA range. A single bitmap is allocated and used across all the hwpts sharing an IOAS which is then used in log_sync() to set Qemu global bitmaps. Signed-off-by: Joao Martins --- backends/iommufd.c | 24 ++++++++++++++++++++++++ backends/trace-events | 1 + hw/vfio/iommufd.c | 30 ++++++++++++++++++++++++++++++ include/sysemu/iommufd.h | 3 +++ 4 files changed, 58 insertions(+) diff --git a/backends/iommufd.c b/backends/iommufd.c index 954de61c2da0..dd676d493c37 100644 --- a/backends/iommufd.c +++ b/backends/iommufd.c @@ -259,6 +259,30 @@ int iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id, return !ret ? 0 : -errno; } +int iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id, + uint64_t iova, ram_addr_t size, + uint64_t page_size, uint64_t *data) +{ + int ret; + struct iommu_hwpt_get_dirty_bitmap get_dirty_bitmap = { + .size = sizeof(get_dirty_bitmap), + .hwpt_id = hwpt_id, + .iova = iova, .length = size, + .page_size = page_size, .data = (uintptr_t)data, + }; + + ret = ioctl(be->fd, IOMMU_HWPT_GET_DIRTY_BITMAP, &get_dirty_bitmap); + trace_iommufd_backend_get_dirty_bitmap(be->fd, hwpt_id, iova, size, + page_size, ret); + if (ret) { + error_report("IOMMU_HWPT_GET_DIRTY_BITMAP (iova: 0x%"PRIx64 + " size: 0x%"PRIx64") failed: %s", iova, + size, strerror(errno)); + } + + return !ret ? 0 : -errno; +} + static const TypeInfo iommufd_backend_info = { .name = TYPE_IOMMUFD_BACKEND, .parent = TYPE_OBJECT, diff --git a/backends/trace-events b/backends/trace-events index feba2baca5f7..11a27cb114b6 100644 --- a/backends/trace-events +++ b/backends/trace-events @@ -17,3 +17,4 @@ iommufd_backend_alloc_hwpt(int iommufd, uint32_t dev_id, uint32_t pt_id, uint32_ iommufd_backend_alloc_ioas(int iommufd, uint32_t ioas, int ret) " iommufd=%d ioas=%d (%d)" iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d id=%d (%d)" iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int ret) " iommufd=%d hwpt=%d enable=%d (%d)" +iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, uint64_t size, uint64_t page_size, int ret) " iommufd=%d hwpt=%d iova=0x%"PRIx64" size=0x%"PRIx64" page_size=0x%"PRIx64" (%d)" diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 361e659288fd..79b13bd262cc 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -25,6 +25,7 @@ #include "qemu/cutils.h" #include "qemu/chardev_open.h" #include "pci.h" +#include "exec/ram_addr.h" #include "migration/migration.h" static int iommufd_cdev_map(const VFIOContainerBase *bcontainer, hwaddr iova, @@ -142,6 +143,34 @@ err: return ret; } +static int iommufd_query_dirty_bitmap(const VFIOContainerBase *bcontainer, + VFIOBitmap *vbmap, uint64_t iova, + uint64_t size) +{ + VFIOIOMMUFDContainer *container = container_of(bcontainer, + VFIOIOMMUFDContainer, + bcontainer); + int ret; + VFIOIOASHwpt *hwpt; + unsigned long page_size; + + if (!bcontainer->dirty_pages_supported) { + return 0; + } + + page_size = qemu_real_host_page_size(); + QLIST_FOREACH(hwpt, &container->hwpt_list, next) { + ret = iommufd_backend_get_dirty_bitmap(container->be, hwpt->hwpt_id, + iova, size, page_size, + vbmap->bitmap); + if (ret) { + break; + } + } + + return ret; +} + static int iommufd_cdev_getfd(const char *sysfs_path, Error **errp) { long int ret = -ENOTTY; @@ -765,6 +794,7 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data) vioc->pci_hot_reset = iommufd_cdev_pci_hot_reset; vioc->host_iommu_device_init = vfio_cdev_host_iommu_device_init; vioc->set_dirty_page_tracking = iommufd_set_dirty_page_tracking; + vioc->query_dirty_bitmap = iommufd_query_dirty_bitmap; }; static const TypeInfo types[] = { diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h index 562c189dd92c..ba19b7ea4c19 100644 --- a/include/sysemu/iommufd.h +++ b/include/sysemu/iommufd.h @@ -55,5 +55,8 @@ int iommufd_backend_alloc_hwpt(int iommufd, uint32_t dev_id, void *data_ptr, uint32_t *out_hwpt); int iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id, bool start); +int iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id, + uint64_t iova, ram_addr_t size, + uint64_t page_size, uint64_t *data); #endif