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Tue, 24 May 2022 15:31:14 +0000 From: Jagannathan Raman To: qemu-devel@nongnu.org Cc: stefanha@redhat.com, mst@redhat.com, f4bug@amsat.org, pbonzini@redhat.com, marcandre.lureau@redhat.com, thuth@redhat.com, bleal@redhat.com, berrange@redhat.com, peter.maydell@linaro.org, eduardo@habkost.net, marcel.apfelbaum@gmail.com, eblake@redhat.com, armbru@redhat.com, quintela@redhat.com, dgilbert@redhat.com, imammedo@redhat.com, peterx@redhat.com, john.levon@nutanix.com, thanos.makatos@nutanix.com, elena.ufimtseva@oracle.com, john.g.johnson@oracle.com, kanth.ghatraju@oracle.com, jag.raman@oracle.com Subject: [PATCH v10 11/14] vfio-user: handle DMA mappings Date: Tue, 24 May 2022 11:30:30 -0400 Message-Id: <52415ba6025ed886828cd49744ed833c121e58ff.1653404595.git.jag.raman@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: X-ClientProxiedBy: SA9P221CA0012.NAMP221.PROD.OUTLOOK.COM (2603:10b6:806:25::17) To MN2PR10MB4013.namprd10.prod.outlook.com (2603:10b6:208:185::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 90a250a8-5ccb-47c5-52dd-08da3d9a7006 X-MS-TrafficTypeDiagnostic: MN2PR10MB3117:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=jag.raman@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, 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_H2=-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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Define and register callbacks to manage the RAM regions used for device DMA Signed-off-by: Elena Ufimtseva Signed-off-by: John G Johnson Signed-off-by: Jagannathan Raman Reviewed-by: Stefan Hajnoczi --- hw/remote/machine.c | 5 ++++ hw/remote/vfio-user-obj.c | 55 +++++++++++++++++++++++++++++++++++++++ hw/remote/trace-events | 2 ++ 3 files changed, 62 insertions(+) diff --git a/hw/remote/machine.c b/hw/remote/machine.c index cbb2add291..645b54343d 100644 --- a/hw/remote/machine.c +++ b/hw/remote/machine.c @@ -22,6 +22,7 @@ #include "hw/remote/iohub.h" #include "hw/remote/iommu.h" #include "hw/qdev-core.h" +#include "hw/remote/iommu.h" static void remote_machine_init(MachineState *machine) { @@ -51,6 +52,10 @@ static void remote_machine_init(MachineState *machine) pci_host = PCI_HOST_BRIDGE(rem_host); + if (s->vfio_user) { + remote_iommu_setup(pci_host->bus); + } + remote_iohub_init(&s->iohub); pci_bus_irqs(pci_host->bus, remote_iohub_set_irq, remote_iohub_map_irq, diff --git a/hw/remote/vfio-user-obj.c b/hw/remote/vfio-user-obj.c index 575bd47397..8d208f1294 100644 --- a/hw/remote/vfio-user-obj.c +++ b/hw/remote/vfio-user-obj.c @@ -284,6 +284,54 @@ static ssize_t vfu_object_cfg_access(vfu_ctx_t *vfu_ctx, char * const buf, return count; } +static void dma_register(vfu_ctx_t *vfu_ctx, vfu_dma_info_t *info) +{ + VfuObject *o = vfu_get_private(vfu_ctx); + AddressSpace *dma_as = NULL; + MemoryRegion *subregion = NULL; + g_autofree char *name = NULL; + struct iovec *iov = &info->iova; + + if (!info->vaddr) { + return; + } + + name = g_strdup_printf("mem-%s-%"PRIx64"", o->device, + (uint64_t)info->vaddr); + + subregion = g_new0(MemoryRegion, 1); + + memory_region_init_ram_ptr(subregion, NULL, name, + iov->iov_len, info->vaddr); + + dma_as = pci_device_iommu_address_space(o->pci_dev); + + memory_region_add_subregion(dma_as->root, (hwaddr)iov->iov_base, subregion); + + trace_vfu_dma_register((uint64_t)iov->iov_base, iov->iov_len); +} + +static void dma_unregister(vfu_ctx_t *vfu_ctx, vfu_dma_info_t *info) +{ + VfuObject *o = vfu_get_private(vfu_ctx); + AddressSpace *dma_as = NULL; + MemoryRegion *mr = NULL; + ram_addr_t offset; + + mr = memory_region_from_host(info->vaddr, &offset); + if (!mr) { + return; + } + + dma_as = pci_device_iommu_address_space(o->pci_dev); + + memory_region_del_subregion(dma_as->root, mr); + + object_unparent((OBJECT(mr))); + + trace_vfu_dma_unregister((uint64_t)info->iova.iov_base); +} + /* * TYPE_VFU_OBJECT depends on the availability of the 'socket' and 'device' * properties. It also depends on devices instantiated in QEMU. These @@ -387,6 +435,13 @@ static void vfu_object_init_ctx(VfuObject *o, Error **errp) goto fail; } + ret = vfu_setup_device_dma(o->vfu_ctx, &dma_register, &dma_unregister); + if (ret < 0) { + error_setg(errp, "vfu: Failed to setup DMA handlers for %s", + o->device); + goto fail; + } + ret = vfu_realize_ctx(o->vfu_ctx); if (ret < 0) { error_setg(errp, "vfu: Failed to realize device %s- %s", diff --git a/hw/remote/trace-events b/hw/remote/trace-events index 2ef7884346..f945c7e33b 100644 --- a/hw/remote/trace-events +++ b/hw/remote/trace-events @@ -7,3 +7,5 @@ mpqemu_recv_io_error(int cmd, int size, int nfds) "failed to receive %d size %d, vfu_prop(const char *prop, const char *val) "vfu: setting %s as %s" vfu_cfg_read(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u -> 0x%x" vfu_cfg_write(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u <- 0x%x" +vfu_dma_register(uint64_t gpa, size_t len) "vfu: registering GPA 0x%"PRIx64", %zu bytes" +vfu_dma_unregister(uint64_t gpa) "vfu: unregistering GPA 0x%"PRIx64""