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charset="utf-8" From: Ankit Agrawal The GPU memory is exposed as device BAR1 to the VM and is discovered by QEMU through the VFIO_DEVICE_GET_REGION_INFO ioctl. QEMU performs the mapping to it. The GPU memory can be added in the VM as (upto 8) separate NUMA nodes. To achieve this, QEMU inserts a series of the PXM domains in the SRAT and communicate this range of nodes to the VM through DSD properties. These PXM start and count are added as object properties and pushed to the SRAT and DST builder code. The code is activated only for a set of NVIDIA devices supporting the feature. Signed-off-by: Ankit Agrawal --- hw/vfio/pci-quirks.c | 13 +++++++ hw/vfio/pci.c | 72 +++++++++++++++++++++++++++++++++++++ hw/vfio/pci.h | 1 + include/hw/pci/pci_device.h | 3 ++ 4 files changed, 89 insertions(+) diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index f0147a050a..b7334ccd1d 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -1751,3 +1751,16 @@ int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **= errp) =20 return 0; } + +bool vfio_has_cpu_coherent_devmem(VFIOPCIDevice *vdev) +{ + switch (vdev->device_id) { + /* Nvidia */ + case 0x2342: + case 0x2343: + case 0x2345: + return true; + } + + return false; +} diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index ec9a854361..403516ffb3 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -42,6 +42,8 @@ #include "qapi/error.h" #include "migration/blocker.h" #include "migration/qemu-file.h" +#include "qapi/visitor.h" +#include "include/hw/boards.h" =20 #define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug" =20 @@ -2824,6 +2826,22 @@ static void vfio_register_req_notifier(VFIOPCIDevice= *vdev) } } =20 +static void vfio_pci_get_gpu_mem_pxm_start(Object *obj, Visitor *v, + const char *name, + void *opaque, Error **errp) +{ + uint64_t pxm_start =3D (uintptr_t) opaque; + visit_type_uint64(v, name, &pxm_start, errp); +} + +static void vfio_pci_get_gpu_mem_pxm_count(Object *obj, Visitor *v, + const char *name, + void *opaque, Error **errp) +{ + uint64_t pxm_count =3D (uintptr_t) opaque; + visit_type_uint64(v, name, &pxm_count, errp); +} + static void vfio_unregister_req_notifier(VFIOPCIDevice *vdev) { Error *err =3D NULL; @@ -2843,6 +2861,53 @@ static void vfio_unregister_req_notifier(VFIOPCIDevi= ce *vdev) vdev->req_enabled =3D false; } =20 +static int vfio_pci_nvidia_dev_mem_probe(VFIOPCIDevice *vPciDev, + Error **errp) +{ + unsigned int num_nodes; + MemoryRegion *nv2mr =3D g_malloc0(sizeof(*nv2mr)); + Object *obj =3D NULL; + VFIODevice *vdev =3D &vPciDev->vbasedev; + MachineState *ms =3D MACHINE(qdev_get_machine()); + + if (!vfio_has_cpu_coherent_devmem(vPciDev)) { + return -ENODEV; + } + + if (vdev->type =3D=3D VFIO_DEVICE_TYPE_PCI) { + obj =3D vfio_pci_get_object(vdev); + } + + if (!obj) { + return -EINVAL; + } + + /* + * This device has memory that is coherently accessible from the CPU. + * The memory can be represented by upto 8 seperate memory-only + * NUMA nodes. + */ + vPciDev->pdev.has_coherent_memory =3D true; + num_nodes =3D 8; + + /* + * To have 8 unique nodes in the VM, a series of PXM nodes are + * required to be added to VM's SRAT. Send the information about + * the starting PXM ID and the count to the ACPI builder code. + */ + object_property_add(OBJECT(vPciDev), "gpu_mem_pxm_start", "uint64", + vfio_pci_get_gpu_mem_pxm_start, NULL, NULL, + (void *) (uintptr_t) ms->numa_state->num_nodes); + + object_property_add(OBJECT(vPciDev), "gpu_mem_pxm_count", "uint64", + vfio_pci_get_gpu_mem_pxm_count, NULL, NULL, + (void *) (uintptr_t) num_nodes); + + ms->numa_state->num_nodes +=3D num_nodes; + + return 0; +} + static void vfio_realize(PCIDevice *pdev, Error **errp) { VFIOPCIDevice *vdev =3D VFIO_PCI(pdev); @@ -3151,6 +3216,13 @@ static void vfio_realize(PCIDevice *pdev, Error **er= rp) } } =20 + if (vdev->vendor_id =3D=3D PCI_VENDOR_ID_NVIDIA) { + ret =3D vfio_pci_nvidia_dev_mem_probe(vdev, errp); + if (ret && ret !=3D -ENODEV) { + error_report("Failed to setup NVIDIA dev_mem with error %d", r= et); + } + } + vfio_register_err_notifier(vdev); vfio_register_req_notifier(vdev); vfio_setup_resetfn_quirk(vdev); diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h index 177abcc8fb..d8791f8f1f 100644 --- a/hw/vfio/pci.h +++ b/hw/vfio/pci.h @@ -226,4 +226,5 @@ void vfio_display_reset(VFIOPCIDevice *vdev); int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp); void vfio_display_finalize(VFIOPCIDevice *vdev); =20 +bool vfio_has_cpu_coherent_devmem(VFIOPCIDevice *vdev); #endif /* HW_VFIO_VFIO_PCI_H */ diff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h index d3dd0f64b2..aacd2279ae 100644 --- a/include/hw/pci/pci_device.h +++ b/include/hw/pci/pci_device.h @@ -157,6 +157,9 @@ struct PCIDevice { MSIVectorReleaseNotifier msix_vector_release_notifier; MSIVectorPollNotifier msix_vector_poll_notifier; =20 + /* GPU coherent memory */ + bool has_coherent_memory; + /* ID of standby device in net_failover pair */ char *failover_pair_id; uint32_t acpi_index; --=20 2.17.1 From nobody Sun May 19 01:26:57 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=nvidia.com); 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charset="utf-8" From: Ankit Agrawal The guest VM adds the GPU memory as (upto 8) separate memory-less NUMA nodes. ACPI SRAT need to thus insert proximity domains and tag them as MEM_AFFINITY_HOTPLUGGABLE. The VM kernel can then parse the SRAT and create NUMA nodes. Signed-off-by: Ankit Agrawal --- hw/arm/virt-acpi-build.c | 54 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index 4156111d49..42f76752b4 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -45,6 +45,7 @@ #include "hw/acpi/hmat.h" #include "hw/pci/pcie_host.h" #include "hw/pci/pci.h" +#include "hw/vfio/pci.h" #include "hw/pci/pci_bus.h" #include "hw/pci-host/gpex.h" #include "hw/arm/virt.h" @@ -514,6 +515,57 @@ build_spcr(GArray *table_data, BIOSLinker *linker, Vir= tMachineState *vms) acpi_table_end(linker, &table); } =20 +static int devmem_device_list(Object *obj, void *opaque) +{ + GSList **list =3D opaque; + + if (object_dynamic_cast(obj, TYPE_VFIO_PCI)) { + *list =3D g_slist_append(*list, DEVICE(obj)); + } + + object_child_foreach(obj, devmem_device_list, opaque); + return 0; +} + +static GSList *devmem_get_device_list(void) +{ + GSList *list =3D NULL; + + object_child_foreach(qdev_get_machine(), devmem_device_list, &list); + return list; +} + +static void build_srat_devmem(GArray *table_data) +{ + GSList *device_list, *list =3D devmem_get_device_list(); + + for (device_list =3D list; device_list; device_list =3D device_list->n= ext) { + DeviceState *dev =3D device_list->data; + Object *obj =3D OBJECT(dev); + VFIOPCIDevice *pcidev + =3D ((VFIOPCIDevice *)object_dynamic_cast(OBJECT(obj), + TYPE_VFIO_PCI)); + + if (pcidev->pdev.has_coherent_memory) { + uint64_t start_node =3D object_property_get_uint(obj, + "gpu_mem_pxm_start", &error_abort); + uint64_t node_count =3D object_property_get_uint(obj, + "gpu_mem_pxm_count", &error_abort); + uint64_t node_index; + + /* + * Add the node_count PXM domains starting from start_node as + * hot pluggable. The VM kernel parse the PXM domains and + * creates NUMA nodes. + */ + for (node_index =3D 0; node_index < node_count; node_index++) + build_srat_memory(table_data, 0, 0, start_node + node_inde= x, + MEM_AFFINITY_ENABLED | MEM_AFFINITY_HOTPLUGGABLE); + } + } + g_slist_free(list); +} + /* * ACPI spec, Revision 5.1 * 5.2.16 System Resource Affinity Table (SRAT) @@ -568,6 +620,8 @@ build_srat(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED= ); } =20 + build_srat_devmem(table_data); + acpi_table_end(linker, &table); } =20 --=20 2.17.1 From nobody Sun May 19 01:26:57 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=nvidia.com); dmarc=pass(p=reject dis=none) header.from=nvidia.com ARC-Seal: i=2; a=rsa-sha256; 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charset="utf-8" From: Ankit Agrawal To add the memory in the guest as NUMA nodes, it needs the PXM node index and the total count of nodes associated with the memory. The range of proximity domains are communicated to the VM as part of the guest ACPI using the nvidia,gpu-mem-pxm-start and nvidia,gpu-mem-pxm-count DSD properties. These value respectively represent the staring proximity domain id and the count. Kernel modules can then fetch this information and determine the numa node ID using pxm_to_node(). Signed-off-by: Ankit Agrawal --- hw/pci-host/gpex-acpi.c | 71 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/hw/pci-host/gpex-acpi.c b/hw/pci-host/gpex-acpi.c index 7c7316bc96..36873889c1 100644 --- a/hw/pci-host/gpex-acpi.c +++ b/hw/pci-host/gpex-acpi.c @@ -49,6 +49,74 @@ static void acpi_dsdt_add_pci_route_table(Aml *dev, uint= 32_t irq) } } =20 +static void acpi_dsdt_add_gpu(Aml *dev, int32_t devfn, + uint64_t gpu_mem_pxm_start, + uint64_t gpu_mem_pxm_count) +{ + Aml *dev_gpu =3D aml_device("GPU%X", PCI_SLOT(devfn)); + Aml *pkg =3D aml_package(2); + Aml *pkg1 =3D aml_package(2); + Aml *pkg2 =3D aml_package(2); + Aml *dev_pkg =3D aml_package(2); + Aml *UUID; + + aml_append(dev_gpu, aml_name_decl("_ADR", aml_int(PCI_SLOT(devfn) << 1= 6))); + + aml_append(pkg1, aml_string("nvidia,gpu-mem-pxm-start")); + aml_append(pkg1, aml_int(gpu_mem_pxm_start)); + + aml_append(pkg2, aml_string("nvidia,gpu-mem-pxm-count")); + aml_append(pkg2, aml_int(gpu_mem_pxm_count)); + + aml_append(pkg, pkg1); + aml_append(pkg, pkg2); + + UUID =3D aml_touuid("DAFFD814-6EBA-4D8C-8A91-BC9BBF4AA301"); + aml_append(dev_pkg, UUID); + aml_append(dev_pkg, pkg); + + aml_append(dev_gpu, aml_name_decl("_DSD", dev_pkg)); + aml_append(dev, dev_gpu); +} + +static void find_hbm_device(PCIBus *bus, PCIDevice *pdev, + void *opaque) +{ + Aml *dev =3D (Aml *)opaque; + uint32_t vendor_id =3D pci_default_read_config(pdev, PCI_VENDOR_ID, 2); + + if (bus =3D=3D NULL) { + return; + } + + if (vendor_id =3D=3D PCI_VENDOR_ID_NVIDIA && + pdev->has_coherent_memory) { + Object *po =3D OBJECT(pdev); + + if (po =3D=3D NULL) { + return; + } + + uint64_t pxm_start + =3D object_property_get_uint(po, "gpu_mem_pxm_start", NULL); + uint64_t pxm_count + =3D object_property_get_uint(po, "gpu_mem_pxm_count", NULL); + + acpi_dsdt_add_gpu(dev, pdev->devfn, pxm_start, pxm_count); + } +} + +static void acpi_dsdt_find_and_add_gpu(PCIBus *bus, Aml *dev) +{ + if (bus =3D=3D NULL) { + return; + } + + pci_for_each_device_reverse(bus, pci_bus_num(bus), + find_hbm_device, dev); + +} + static void acpi_dsdt_add_pci_osc(Aml *dev) { Aml *method, *UUID, *ifctx, *ifctx1, *elsectx, *buf; @@ -207,7 +275,10 @@ void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig = *cfg) =20 acpi_dsdt_add_pci_route_table(dev, cfg->irq); =20 + acpi_dsdt_find_and_add_gpu(cfg->bus, dev); + method =3D aml_method("_CBA", 0, AML_NOTSERIALIZED); + aml_append(method, aml_return(aml_int(cfg->ecam.base))); aml_append(dev, method); =20 --=20 2.17.1 From nobody Sun May 19 01:26:57 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=nvidia.com); dmarc=pass(p=reject dis=none) header.from=nvidia.com ARC-Seal: i=2; a=rsa-sha256; t=1686013701; cv=pass; d=zohomail.com; s=zohoarc; b=Y5BK0+EhTxLu9G4DyHxyjc7vK7KrrysLERO6joics4Fwxoe6eLTOpxNJFxb9woHpLGxI3w9IkmZAwFpRXyAGlX95Y23to5qT3lKj0YNQkUr23a23Mz+cSq0H+9/3ASPn3GAPHu+dS7qaBu+CgW/2MPPn2C14LXJ8byMBEF7Swkg= ARC-Message-Signature: i=2; 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envelope-from=ankita@nvidia.com; helo=NAM12-DM6-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 05 Jun 2023 21:07:19 -0400 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @Nvidia.com) X-ZM-MESSAGEID: 1686013701813100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ankit Agrawal The GPU device memory is reported to the VM as a BAR. The device memory may not be aligned to the power-of-2, but the QEMU expects the PCI BAR to be. Align the reported device memory size to the next power-of-2 before QEMU does an mmap. Signed-off-by: Ankit Agrawal --- hw/vfio/common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 4d01ea3515..bb49200458 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -2061,7 +2061,7 @@ int vfio_region_setup(Object *obj, VFIODevice *vbased= ev, VFIORegion *region, =20 region->vbasedev =3D vbasedev; region->flags =3D info->flags; - region->size =3D info->size; + region->size =3D info->size ? pow2ceil(info->size) : info->size; region->fd_offset =3D info->offset; region->nr =3D index; =20 --=20 2.17.1