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| author | Eduardo Habkost | 2017-09-01 04:10:02 +0200 |
|---|---|---|
| committer | Eduardo Habkost | 2017-09-19 21:51:33 +0200 |
| commit | 4926403c250fc41dc2d27f1c77e200e7d3d239cd (patch) | |
| tree | 071db7a4d3386dad35ab48c5c7ee7ecca01f08bd | |
| parent | NUMA: Replace MAX_NODES with nb_numa_nodes in for loop (diff) | |
| download | qemu-4926403c250fc41dc2d27f1c77e200e7d3d239cd.tar.gz qemu-4926403c250fc41dc2d27f1c77e200e7d3d239cd.tar.xz qemu-4926403c250fc41dc2d27f1c77e200e7d3d239cd.zip | |
hw/acpi-build: Fix SRAT memory building in case of node 0 without RAM
Currently, Using the fisrt node without memory on the machine makes
QEMU unhappy. With this example command line:
... \
-m 1024M,slots=4,maxmem=32G \
-numa node,nodeid=0 \
-numa node,mem=1024M,nodeid=1 \
-numa node,nodeid=2 \
-numa node,nodeid=3 \
Guest reports "No NUMA configuration found" and the NUMA topology is
wrong.
This is because when QEMU builds ACPI SRAT, it regards node 0 as the
default node to deal with the memory hole(640K-1M). this means the
node0 must have some memory(>1M), but, actually it can have no
memory.
Fix this problem by cut out the 640K hole in the same way the PCI
4G hole does.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Message-Id: <1504231805-30957-2-git-send-email-douly.fnst@cn.fujitsu.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
| -rw-r--r-- | hw/i386/acpi-build.c | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 4d19d91e1b..d72bcdcd49 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -2288,6 +2288,9 @@ build_tpm2(GArray *table_data, BIOSLinker *linker) (void *)tpm2_ptr, "TPM2", sizeof(*tpm2_ptr), 4, NULL, NULL); } +#define HOLE_640K_START (640 * 1024) +#define HOLE_640K_END (1024 * 1024) + static void build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine) { @@ -2343,17 +2346,30 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine) next_base = 0; numa_start = table_data->len; - numamem = acpi_data_push(table_data, sizeof *numamem); - build_srat_memory(numamem, 0, 640 * 1024, 0, MEM_AFFINITY_ENABLED); - next_base = 1024 * 1024; for (i = 1; i < pcms->numa_nodes + 1; ++i) { mem_base = next_base; mem_len = pcms->node_mem[i - 1]; - if (i == 1) { - mem_len -= 1024 * 1024; - } next_base = mem_base + mem_len; + /* Cut out the 640K hole */ + if (mem_base <= HOLE_640K_START && + next_base > HOLE_640K_START) { + mem_len -= next_base - HOLE_640K_START; + if (mem_len > 0) { + numamem = acpi_data_push(table_data, sizeof *numamem); + build_srat_memory(numamem, mem_base, mem_len, i - 1, + MEM_AFFINITY_ENABLED); + } + + /* Check for the rare case: 640K < RAM < 1M */ + if (next_base <= HOLE_640K_END) { + next_base = HOLE_640K_END; + continue; + } + mem_base = HOLE_640K_END; + mem_len = next_base - HOLE_640K_END; + } + /* Cut out the ACPI_PCI hole */ if (mem_base <= pcms->below_4g_mem_size && next_base > pcms->below_4g_mem_size) { |