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Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF00000205.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4169 Received-SPF: permerror client-ip=2a01:111:f403:c110::3; envelope-from=FangSheng.Huang@amd.com; helo=BN8PR05CU002.outbound.protection.outlook.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, 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 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: qemu development 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 Introduce a TYPE_MEMORY_DEVICE subclass `sp-mem` for boot-time SOFT_RESERVED memory exposed to the guest with a per-device NUMA proximity domain. The device targets accelerator memory (HBM and similar) that the firmware hands to the guest OS as SOFT_RESERVED memory, so a driver in the guest -- rather than the kernel's general allocator -- owns the range. Usage: -object memory-backend-ram,id=spm0,size=$SIZE -numa node,nodeid=$N -device sp-mem,id=dev0,memdev=spm0,node=$N[,addr=$GPA] The device is boot-time only (no hotplug). Signed-off-by: FangSheng Huang --- include/hw/mem/sp-mem.h | 33 ++++++++++++ hw/mem/sp-mem.c | 109 ++++++++++++++++++++++++++++++++++++++++ hw/mem/Kconfig | 4 ++ hw/mem/meson.build | 1 + 4 files changed, 147 insertions(+) create mode 100644 include/hw/mem/sp-mem.h create mode 100644 hw/mem/sp-mem.c diff --git a/include/hw/mem/sp-mem.h b/include/hw/mem/sp-mem.h new file mode 100644 index 0000000000..a8951b49e6 --- /dev/null +++ b/include/hw/mem/sp-mem.h @@ -0,0 +1,33 @@ +/* + * Specific Purpose Memory (SPM) device + * + * TYPE_MEMORY_DEVICE subclass for boot-time-only memory exposed to the + * guest as an E820 SOFT_RESERVED range with a SRAT memory-affinity entry. + * + * Copyright (c) 2026 Advanced Micro Devices, Inc. + * + * Authors: + * FangSheng Huang + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef QEMU_SP_MEM_H +#define QEMU_SP_MEM_H + +#include "hw/core/qdev.h" +#include "qom/object.h" + +#define TYPE_SP_MEM "sp-mem" + +OBJECT_DECLARE_SIMPLE_TYPE(SpMemDevice, SP_MEM) + +struct SpMemDevice { + DeviceState parent_obj; + + HostMemoryBackend *hostmem; + uint32_t node; + uint64_t addr; +}; + +#endif /* QEMU_SP_MEM_H */ diff --git a/hw/mem/sp-mem.c b/hw/mem/sp-mem.c new file mode 100644 index 0000000000..d088222f54 --- /dev/null +++ b/hw/mem/sp-mem.c @@ -0,0 +1,109 @@ +/* + * Specific Purpose Memory (SPM) device + * + * Copyright (c) 2026 Advanced Micro Devices, Inc. + * + * Authors: + * FangSheng Huang + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/module.h" +#include "qapi/error.h" +#include "hw/core/qdev-properties.h" +#include "hw/core/qdev.h" +#include "hw/mem/sp-mem.h" +#include "hw/mem/memory-device.h" +#include "system/hostmem.h" + +#define SP_MEM_MEMDEV_PROP "memdev" +#define SP_MEM_NODE_PROP "node" +#define SP_MEM_ADDR_PROP "addr" + +static const Property sp_mem_properties[] = { + DEFINE_PROP_LINK(SP_MEM_MEMDEV_PROP, SpMemDevice, hostmem, + TYPE_MEMORY_BACKEND, HostMemoryBackend *), + DEFINE_PROP_UINT32(SP_MEM_NODE_PROP, SpMemDevice, node, 0), + DEFINE_PROP_UINT64(SP_MEM_ADDR_PROP, SpMemDevice, addr, 0), +}; + +static uint64_t sp_mem_get_addr(const MemoryDeviceState *md) +{ + return object_property_get_uint(OBJECT(md), SP_MEM_ADDR_PROP, + &error_abort); +} + +static void sp_mem_set_addr(MemoryDeviceState *md, uint64_t addr, + Error **errp) +{ + object_property_set_uint(OBJECT(md), SP_MEM_ADDR_PROP, addr, errp); +} + +static MemoryRegion *sp_mem_get_memory_region(MemoryDeviceState *md, + Error **errp) +{ + SpMemDevice *spm = SP_MEM(md); + + if (!spm->hostmem) { + error_setg(errp, "'%s' property must be set", SP_MEM_MEMDEV_PROP); + return NULL; + } + return host_memory_backend_get_memory(spm->hostmem); +} + +static void sp_mem_realize(DeviceState *dev, Error **errp) +{ + SpMemDevice *spm = SP_MEM(dev); + + if (!spm->hostmem) { + error_setg(errp, "'%s' property is required", SP_MEM_MEMDEV_PROP); + return; + } + if (host_memory_backend_is_mapped(spm->hostmem)) { + error_setg(errp, "memory backend '%s' is already in use", + object_get_canonical_path_component(OBJECT(spm->hostmem))); + return; + } + host_memory_backend_set_mapped(spm->hostmem, true); +} + +static void sp_mem_unrealize(DeviceState *dev) +{ + SpMemDevice *spm = SP_MEM(dev); + + host_memory_backend_set_mapped(spm->hostmem, false); +} + +static void sp_mem_class_init(ObjectClass *oc, const void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc); + + dc->desc = "SPM (Specific Purpose Memory) device"; + dc->hotpluggable = false; + dc->realize = sp_mem_realize; + dc->unrealize = sp_mem_unrealize; + device_class_set_props(dc, sp_mem_properties); + + mdc->get_addr = sp_mem_get_addr; + mdc->set_addr = sp_mem_set_addr; + mdc->get_memory_region = sp_mem_get_memory_region; + mdc->get_plugged_size = memory_device_get_region_size; +} + +static const TypeInfo sp_mem_types[] = { + { + .name = TYPE_SP_MEM, + .parent = TYPE_DEVICE, + .class_init = sp_mem_class_init, + .instance_size = sizeof(SpMemDevice), + .interfaces = (InterfaceInfo[]) { + { TYPE_MEMORY_DEVICE }, + { } + }, + }, +}; + +DEFINE_TYPES(sp_mem_types) diff --git a/hw/mem/Kconfig b/hw/mem/Kconfig index 73c5ae8ad9..39ddb36710 100644 --- a/hw/mem/Kconfig +++ b/hw/mem/Kconfig @@ -16,3 +16,7 @@ config CXL_MEM_DEVICE bool default y if CXL select MEM_DEVICE + +config SP_MEM + bool + select MEM_DEVICE diff --git a/hw/mem/meson.build b/hw/mem/meson.build index 8c2beeb7d4..f410d75475 100644 --- a/hw/mem/meson.build +++ b/hw/mem/meson.build @@ -4,6 +4,7 @@ mem_ss.add(when: 'CONFIG_DIMM', if_true: files('pc-dimm.c')) mem_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_mc.c')) mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c')) mem_ss.add(when: 'CONFIG_CXL_MEM_DEVICE', if_true: files('cxl_type3.c')) +mem_ss.add(when: 'CONFIG_SP_MEM', if_true: files('sp-mem.c')) stub_ss.add(files('cxl_type3_stubs.c')) stub_ss.add(files('memory-device-stubs.c')) -- 2.34.1