Hi Eric, As I informed you earlier, I am working on adding the hot-add support for pc-dimm and nvdimm on top of this series using the pl061 GPIO pins as a way to inject memory hot add events to the Guest. I came across a problem while testing my patches which looks like is related to the way SRAT entries are populated in this patch.
If I boot the Guest without NUMA and hot add dimms, all seems to be working fine. But when I enable NUMA (-numa node,nodeid=0), and hot add dimms and perform a reboot, it fails. Something like this, ./qemu-system-aarch64 \ -machine virt,kernel_irqchip=on,gic-version=3,nvdimm \ -m 1G,maxmem=4G,slots=5 \ -cpu host \ -kernel Image \ -bios QEMU_EFI.fd \ -initrd rootfs-iperf.cpio \ -numa node,nodeid=0 \ -net none \ -nographic -enable-kvm \ -append "console=ttyAMA0 root=/dev/vda rw acpi=force" Qemu Monitor: (qemu) object_add memory-backend-ram,id=mem1,size=1G (qemu) device_add pc-dimm,id=dimm1,memdev=mem1 Exit QM and reboot the Guest. EFI stub: Booting Linux Kernel... EFI stub: Generating empty DTB EFI stub: Exiting boot services and installing virtual address map... [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x480fd010] [ 0.000000] Linux version 4.20.0-rc3-dirty (shameer@shameer-ubuntu) (gcc version 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701] (Linaro GCC 7.3-2018.05)) #21 SMP PREEMPT Wed Jan 16 14:45:58 GMT 2019 [ 0.000000] earlycon: pl11 at MMIO 0x0000000009000000 (options '') [ 0.000000] printk: bootconsole [pl11] enabled [ 0.000000] efi: Getting EFI parameters from FDT: [ 0.000000] efi: EFI v2.70 by EDK II [ 0.000000] efi: SMBIOS 3.0=0x7f810000 MEMATTR=0x7c63ca98 MEMRESERVE=0x7bfeb018 [ 0.000000] cma: Reserved 32 MiB at 0x000000007d000000 [ 0.000000] ACPI: Early table checksum verification disabled [ 0.000000] ACPI: System description tables not found [ 0.000000] ACPI: Failed to init ACPI tables [ 0.000000] ACPI: NUMA: Failed to initialise from firmware [...] Debug shows that edk2 had a check[1] to verify the table size and it fails on reboot when NUMA is enabled(ie, SRAT is present), ProcessCmdAddPointer: invalid pointer location or size in "etc/acpi/tables" This seems to be related to the below code where SRAT is built, > -----Original Message----- > From: Eric Auger [mailto:eric.au...@redhat.com] > Sent: 18 October 2018 15:31 > To: eric.auger....@gmail.com; eric.au...@redhat.com; > qemu-devel@nongnu.org; qemu-...@nongnu.org; peter.mayd...@linaro.org; > Shameerali Kolothum Thodi <shameerali.kolothum.th...@huawei.com>; > kwangwoo....@sk.com; imamm...@redhat.com; da...@redhat.com > Cc: drjo...@redhat.com; dgilb...@redhat.com; suzuki.poul...@arm.com > Subject: [RFC v4 11/16] acpi: move build_srat_hotpluggable_memory to generic > ACPI source > > We plan to reuse build_srat_hotpluggable_memory() for ARM so > let's move the function to aml-build. > > Signed-off-by: Eric Auger <eric.au...@redhat.com> > --- > hw/acpi/aml-build.c | 51 > +++++++++++++++++++++++++++++++++++++ > include/hw/acpi/aml-build.h | 3 +++ > 2 files changed, 54 insertions(+) > > diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c > index 1e43cd736d..167fb6bf3e 100644 > --- a/hw/acpi/aml-build.c > +++ b/hw/acpi/aml-build.c > @@ -22,6 +22,7 @@ > #include "qemu/osdep.h" > #include <glib/gprintf.h> > #include "hw/acpi/aml-build.h" > +#include "hw/mem/memory-device.h" > #include "qemu/bswap.h" > #include "qemu/bitops.h" > #include "sysemu/numa.h" > @@ -1802,3 +1803,53 @@ build_hdr: > build_header(linker, tbl, (void *)(tbl->data + fadt_start), > "FACP", tbl->len - fadt_start, f->rev, oem_id, > oem_table_id); > } > + > +void build_srat_hotpluggable_memory(GArray *table_data, uint64_t base, > + uint64_t len, int default_node) > +{ > + MemoryDeviceInfoList *info_list = qmp_memory_device_list(); > + MemoryDeviceInfoList *info; > + MemoryDeviceInfo *mi; > + PCDIMMDeviceInfo *di; > + uint64_t end = base + len, cur, size; > + bool is_nvdimm; > + AcpiSratMemoryAffinity *numamem; > + MemoryAffinityFlags flags; > + > + for (cur = base, info = info_list; > + cur < end; > + cur += size, info = info->next) { > + numamem = acpi_data_push(table_data, sizeof *numamem); > + > + if (!info) { > + build_srat_memory(numamem, cur, end - cur, default_node, > + MEM_AFFINITY_HOTPLUGGABLE | > MEM_AFFINITY_ENABLED); > + break; > + } > + > + mi = info->value; > + is_nvdimm = (mi->type == > MEMORY_DEVICE_INFO_KIND_NVDIMM); > + di = !is_nvdimm ? mi->u.dimm.data : mi->u.nvdimm.data; > + > + if (cur < di->addr) { > + build_srat_memory(numamem, cur, di->addr - cur, > default_node, > + MEM_AFFINITY_HOTPLUGGABLE | > MEM_AFFINITY_ENABLED); > + numamem = acpi_data_push(table_data, sizeof *numamem); > + } > + > + size = di->size; > + > + flags = MEM_AFFINITY_ENABLED; > + if (di->hotpluggable) { > + flags |= MEM_AFFINITY_HOTPLUGGABLE; > + } > + if (is_nvdimm) { > + flags |= MEM_AFFINITY_NON_VOLATILE; > + } > + > + build_srat_memory(numamem, di->addr, size, di->node, flags); > + } > + > + qapi_free_MemoryDeviceInfoList(info_list); > +} The above logic changes the SRAT entries if dimm is hot-added and a reboot is performed and as mentioned above, EDK2 seems to be not happy with this. I had a look at the pc code and it looks like it only has one SRAT entry for the whole hot-pluggable address space[2] which probable means SRAT remains same across reboot even after mem is hot added. Not sure why we are doing this differently for ARM. Please take a look and let me know your thoughts. Thanks, Shameer [1] https://github.com/tianocore/edk2/blob/master/OvmfPkg/AcpiPlatformDxe/QemuFwCfgAcpi.c#L459 [2] https://github.com/eauger/qemu/blob/v3.0.0-dimm-2tb-v4/hw/i386/acpi-build.c#L2367 > + > diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h > index 6c36903c0a..4c2ca134ee 100644 > --- a/include/hw/acpi/aml-build.h > +++ b/include/hw/acpi/aml-build.h > @@ -416,4 +416,7 @@ void build_slit(GArray *table_data, BIOSLinker *linker); > > void build_fadt(GArray *tbl, BIOSLinker *linker, const AcpiFadtData *f, > const char *oem_id, const char *oem_table_id); > + > +void build_srat_hotpluggable_memory(GArray *table_data, uint64_t base, > + uint64_t len, int default_node); > #endif > -- > 2.17.1
