On Fri, 5 Jun 2026 18:46:07 +0800 fanhuang <[email protected]> wrote:
> Restructure the device_memory SRAT umbrella entry into a per-kind > partition: each TYPE_SP_MEM device gets an ENABLED entry at its own > proximity_domain; the remaining sub-ranges get HOTPLUGGABLE | ENABLED > placeholders at the highest PXM, preserving the existing umbrella > convention. > > Signed-off-by: FangSheng Huang <[email protected]> > --- > hw/i386/acpi-build.c | 98 +++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 92 insertions(+), 6 deletions(-) > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c > index 0d7c83d5e9..76efa83808 100644 > --- a/hw/i386/acpi-build.c > +++ b/hw/i386/acpi-build.c > @@ -52,6 +52,7 @@ > #include "migration/vmstate.h" > #include "hw/mem/memory-device.h" > #include "hw/mem/nvdimm.h" > +#include "hw/mem/sp-mem.h" > #include "system/numa.h" > #include "system/reset.h" > #include "hw/hyperv/vmbus-bridge.h" > @@ -1346,6 +1347,96 @@ build_tpm_tcpa(GArray *table_data, BIOSLinker *linker, > GArray *tcpalog, > } > #endif > > +typedef struct { > + uint64_t addr; > + uint64_t size; > + uint32_t node; > +} SpMemRange; > + > +static int collect_sp_mem_ranges_cb(Object *obj, void *opaque) sp_mem_collect... maybe > +{ > + GArray *ranges = opaque; > + SpMemDevice *spm; > + MemoryDeviceClass *mdc; > + SpMemRange r; > + > + if (!object_dynamic_cast(obj, TYPE_SP_MEM)) { > + return 0; > + } > + spm = SP_MEM(obj); > + mdc = MEMORY_DEVICE_GET_CLASS(MEMORY_DEVICE(spm)); > + r.addr = mdc->get_addr(MEMORY_DEVICE(spm)); > + r.size = memory_region_size( > + host_memory_backend_get_memory(spm->hostmem)); > + r.node = spm->node; > + g_array_append_val(ranges, r); > + return 0; > +} > + > +static gint sp_mem_range_compare(gconstpointer a, gconstpointer b) > +{ > + const SpMemRange *range_a = a; > + const SpMemRange *range_b = b; > + > + if (range_a->addr < range_b->addr) { > + return -1; > + } > + if (range_a->addr > range_b->addr) { > + return 1; > + } > + return 0; > +} > + > +/* > + * Emit SRAT memory-affinity entries covering the device_memory region. > + * > + * For each plugged TYPE_SP_MEM device, emit an ENABLED entry at the > + * device's own proximity_domain. All remaining sub-ranges (gaps > + * between sp-mem devices, leading and trailing padding, and ranges > + * occupied by other memory devices) are covered by HOTPLUGGABLE | > + * ENABLED placeholder entries at PXM = nb_numa_nodes - 1. > + */ > +static void build_srat_device_memory(GArray *table_data, MachineState *ms) > +{ > + g_autoptr(GArray) ranges = g_array_new(FALSE, TRUE, sizeof(SpMemRange)); > + uint64_t cursor, end; region_start, region_end > + int nb_nodes = ms->numa_state ? ms->numa_state->num_nodes : 0; > + uint32_t hotplug_pxm = nb_nodes > 0 ? nb_nodes - 1 : 0; when function is called ms->numa_state->num_nodes is always > 0, isn't it? > + guint i; > + > + if (!ms->device_memory) { > + return; > + } > + > + cursor = ms->device_memory->base; > + end = cursor + memory_region_size(&ms->device_memory->mr); > + > + object_child_foreach_recursive(qdev_get_machine(), > + collect_sp_mem_ranges_cb, ranges); > + g_array_sort(ranges, sp_mem_range_compare); > + > + for (i = 0; i < ranges->len; i++) { > + SpMemRange *r = &g_array_index(ranges, SpMemRange, i); > + > + if (cursor < r->addr) { > + build_srat_memory(table_data, cursor, r->addr - cursor, > + hotplug_pxm, > + MEM_AFFINITY_HOTPLUGGABLE | > + MEM_AFFINITY_ENABLED); > + } > + build_srat_memory(table_data, r->addr, r->size, r->node, > + MEM_AFFINITY_ENABLED); > + cursor = r->addr + r->size; > + } > + > + if (cursor < end) { > + build_srat_memory(table_data, cursor, end - cursor, > + hotplug_pxm, > + MEM_AFFINITY_HOTPLUGGABLE | > + MEM_AFFINITY_ENABLED); > + } > +} > + > #define HOLE_640K_START (640 * KiB) > #define HOLE_640K_END (1 * MiB) > > @@ -1481,12 +1572,7 @@ build_srat(GArray *table_data, BIOSLinker *linker, > MachineState *machine) > * Memory devices may override proximity set by this entry, > * providing _PXM method if necessary. > */ > - if (machine->device_memory) { keep it here, and drop one in build_srat_device_memory() > - build_srat_memory(table_data, machine->device_memory->base, > - memory_region_size(&machine->device_memory->mr), > - nb_numa_nodes - 1, > - MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED); > - } > + build_srat_device_memory(table_data, machine); > > acpi_table_end(linker, &table); > }
