* [Qemu-devel] [PATCH v6 1/4] hw/acpi-build: Fix SRAT memory building in case of node 0 without RAM
2017-09-01 2:10 [Qemu-devel] [PATCH v6 0/4]ACPI: NUMA: Fix ACPI SRAT Memory Affinity building Dou Liyang
@ 2017-09-01 2:10 ` Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read Dou Liyang
` (2 subsequent siblings)
3 siblings, 0 replies; 7+ messages in thread
From: Dou Liyang @ 2017-09-01 2:10 UTC (permalink / raw)
To: qemu-devel; +Cc: ehabkost, imammedo, mst, rth, Dou Liyang
From: Eduardo Habkost <ehabkost@redhat.com>
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>
---
hw/i386/acpi-build.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 98dd424..a0cf3bf 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2318,6 +2318,9 @@ 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)
{
@@ -2373,17 +2376,30 @@ 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) {
--
2.5.5
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read
2017-09-01 2:10 [Qemu-devel] [PATCH v6 0/4]ACPI: NUMA: Fix ACPI SRAT Memory Affinity building Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 1/4] hw/acpi-build: Fix SRAT memory building in case of node 0 without RAM Dou Liyang
@ 2017-09-01 2:10 ` Dou Liyang
2017-10-10 2:29 ` Eduardo Habkost
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 3/4] ACPI/unit-test: Add a new testcase for RAM allocation in numa node Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 4/4] NUMA: Replace MAX_NODES with nb_numa_nodes in for loop Dou Liyang
3 siblings, 1 reply; 7+ messages in thread
From: Dou Liyang @ 2017-09-01 2:10 UTC (permalink / raw)
To: qemu-devel; +Cc: ehabkost, imammedo, mst, rth, Dou Liyang
It may be hard to read the assignment statement of "next_base", so
S/next_base += (1ULL << 32) - pcms->below_4g_mem_size;
/next_base = mem_base + mem_len;
... for readability.
No functionality change.
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
---
hw/i386/acpi-build.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index a0cf3bf..48525a1 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2411,7 +2411,7 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
}
mem_base = 1ULL << 32;
mem_len = next_base - pcms->below_4g_mem_size;
- next_base += (1ULL << 32) - pcms->below_4g_mem_size;
+ next_base = mem_base + mem_len;
}
numamem = acpi_data_push(table_data, sizeof *numamem);
build_srat_memory(numamem, mem_base, mem_len, i - 1,
--
2.5.5
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read Dou Liyang
@ 2017-10-10 2:29 ` Eduardo Habkost
2017-10-10 2:34 ` Dou Liyang
0 siblings, 1 reply; 7+ messages in thread
From: Eduardo Habkost @ 2017-10-10 2:29 UTC (permalink / raw)
To: Dou Liyang; +Cc: qemu-devel, imammedo, rth, mst, Peter Maydell
On Fri, Sep 01, 2017 at 10:10:03AM +0800, Dou Liyang wrote:
> It may be hard to read the assignment statement of "next_base", so
>
> S/next_base += (1ULL << 32) - pcms->below_4g_mem_size;
> /next_base = mem_base + mem_len;
>
> ... for readability.
>
> No functionality change.
>
> Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
This or the new test case at patch 3/4 seem to have caused build
failures under some circumstances:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg486368.html
I couldn't reproduce the failure yet, but I'm removing this and
patch 3/4 from the queue until this is investigated.
> ---
> hw/i386/acpi-build.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index a0cf3bf..48525a1 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -2411,7 +2411,7 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
> }
> mem_base = 1ULL << 32;
> mem_len = next_base - pcms->below_4g_mem_size;
> - next_base += (1ULL << 32) - pcms->below_4g_mem_size;
> + next_base = mem_base + mem_len;
> }
> numamem = acpi_data_push(table_data, sizeof *numamem);
> build_srat_memory(numamem, mem_base, mem_len, i - 1,
> --
> 2.5.5
>
>
>
>
--
Eduardo
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read
2017-10-10 2:29 ` Eduardo Habkost
@ 2017-10-10 2:34 ` Dou Liyang
0 siblings, 0 replies; 7+ messages in thread
From: Dou Liyang @ 2017-10-10 2:34 UTC (permalink / raw)
To: Eduardo Habkost; +Cc: qemu-devel, imammedo, rth, mst, Peter Maydell
Hi Eduardo,
At 10/10/2017 10:29 AM, Eduardo Habkost wrote:
> On Fri, Sep 01, 2017 at 10:10:03AM +0800, Dou Liyang wrote:
>> It may be hard to read the assignment statement of "next_base", so
>>
>> S/next_base += (1ULL << 32) - pcms->below_4g_mem_size;
>> /next_base = mem_base + mem_len;
>>
>> ... for readability.
>>
>> No functionality change.
>>
>> Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
>
> This or the new test case at patch 3/4 seem to have caused build
> failures under some circumstances:
>
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg486368.html
>
> I couldn't reproduce the failure yet, but I'm removing this and
> patch 3/4 from the queue until this is investigated.
Hmm, I see, I will do it.
Thanks,
dou.
>
>> ---
>> hw/i386/acpi-build.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
>> index a0cf3bf..48525a1 100644
>> --- a/hw/i386/acpi-build.c
>> +++ b/hw/i386/acpi-build.c
>> @@ -2411,7 +2411,7 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
>> }
>> mem_base = 1ULL << 32;
>> mem_len = next_base - pcms->below_4g_mem_size;
>> - next_base += (1ULL << 32) - pcms->below_4g_mem_size;
>> + next_base = mem_base + mem_len;
>> }
>> numamem = acpi_data_push(table_data, sizeof *numamem);
>> build_srat_memory(numamem, mem_base, mem_len, i - 1,
>> --
>> 2.5.5
>>
>>
>>
>>
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Qemu-devel] [PATCH v6 3/4] ACPI/unit-test: Add a new testcase for RAM allocation in numa node
2017-09-01 2:10 [Qemu-devel] [PATCH v6 0/4]ACPI: NUMA: Fix ACPI SRAT Memory Affinity building Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 1/4] hw/acpi-build: Fix SRAT memory building in case of node 0 without RAM Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 2/4] hw/acpi-build: Make assignment statement of next_base easy to read Dou Liyang
@ 2017-09-01 2:10 ` Dou Liyang
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 4/4] NUMA: Replace MAX_NODES with nb_numa_nodes in for loop Dou Liyang
3 siblings, 0 replies; 7+ messages in thread
From: Dou Liyang @ 2017-09-01 2:10 UTC (permalink / raw)
To: qemu-devel; +Cc: ehabkost, imammedo, mst, rth, Dou Liyang
As QEMU supports the memory-less node, it is possible that there is
no RAM in the first numa node(also be called as node0). eg:
... \
-m 128,slots=3,maxmem=1G \
-numa node -numa node,mem=128M \
But, this makes it hard for QEMU to build a known-to-work ACPI SRAT
table. Only fixing it is not enough.
Add a testcase for this situation to make sure the ACPI table is
correct for guest.
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
---
tests/acpi-test-data/pc/DSDT.numamem | Bin 0 -> 5104 bytes
tests/acpi-test-data/pc/SRAT.numamem | Bin 0 -> 224 bytes
tests/acpi-test-data/q35/DSDT.numamem | Bin 0 -> 7788 bytes
tests/acpi-test-data/q35/SRAT.numamem | Bin 0 -> 224 bytes
tests/bios-tables-test.c | 24 ++++++++++++++++++++++++
5 files changed, 24 insertions(+)
create mode 100644 tests/acpi-test-data/pc/DSDT.numamem
create mode 100644 tests/acpi-test-data/pc/SRAT.numamem
create mode 100644 tests/acpi-test-data/q35/DSDT.numamem
create mode 100644 tests/acpi-test-data/q35/SRAT.numamem
diff --git a/tests/acpi-test-data/pc/DSDT.numamem b/tests/acpi-test-data/pc/DSDT.numamem
new file mode 100644
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diff --git a/tests/acpi-test-data/q35/SRAT.numamem b/tests/acpi-test-data/q35/SRAT.numamem
new file mode 100644
index 0000000000000000000000000000000000000000..dbc595d9cb85d3fcb5a4243153f42bb431c9de8f
GIT binary patch
literal 224
zcmWFzatwLEz`(%x#mV2<BUr&HBEUHqD8>jB1F=Cg2*ZH@DxXmUE`z~9*2k!U%mXRq
Yf~!ZCL8t>-1O^}2VG2>z!9?-X08OU~0RR91
literal 0
HcmV?d00001
diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
index 564da45..f092315 100644
--- a/tests/bios-tables-test.c
+++ b/tests/bios-tables-test.c
@@ -808,6 +808,28 @@ static void test_acpi_piix4_tcg_memhp(void)
free_test_data(&data);
}
+static void test_acpi_q35_tcg_numamem(void)
+{
+ test_data data;
+
+ memset(&data, 0, sizeof(data));
+ data.machine = MACHINE_Q35;
+ data.variant = ".numamem";
+ test_acpi_one(" -numa node -numa node,mem=128", &data);
+ free_test_data(&data);
+}
+
+static void test_acpi_piix4_tcg_numamem(void)
+{
+ test_data data;
+
+ memset(&data, 0, sizeof(data));
+ data.machine = MACHINE_PC;
+ data.variant = ".numamem";
+ test_acpi_one(" -numa node -numa node,mem=128", &data);
+ free_test_data(&data);
+}
+
int main(int argc, char *argv[])
{
const char *arch = qtest_get_arch();
@@ -830,6 +852,8 @@ int main(int argc, char *argv[])
qtest_add_func("acpi/q35/cpuhp", test_acpi_q35_tcg_cphp);
qtest_add_func("acpi/piix4/memhp", test_acpi_piix4_tcg_memhp);
qtest_add_func("acpi/q35/memhp", test_acpi_q35_tcg_memhp);
+ qtest_add_func("acpi/piix4/numamem", test_acpi_piix4_tcg_numamem);
+ qtest_add_func("acpi/q35/numamem", test_acpi_q35_tcg_numamem);
}
ret = g_test_run();
boot_sector_cleanup(disk);
--
2.5.5
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH v6 4/4] NUMA: Replace MAX_NODES with nb_numa_nodes in for loop
2017-09-01 2:10 [Qemu-devel] [PATCH v6 0/4]ACPI: NUMA: Fix ACPI SRAT Memory Affinity building Dou Liyang
` (2 preceding siblings ...)
2017-09-01 2:10 ` [Qemu-devel] [PATCH v6 3/4] ACPI/unit-test: Add a new testcase for RAM allocation in numa node Dou Liyang
@ 2017-09-01 2:10 ` Dou Liyang
3 siblings, 0 replies; 7+ messages in thread
From: Dou Liyang @ 2017-09-01 2:10 UTC (permalink / raw)
To: qemu-devel; +Cc: ehabkost, imammedo, mst, rth, Dou Liyang
In QEMU, the number of the NUMA nodes is determined by parse_numa_opts().
Then, QEMU uses it for iteration, for example:
for (i = 0; i < nb_numa_nodes; i++)
However, in memory_region_allocate_system_memory(), it uses MAX_NODES
not nb_numa_nodes.
So, replace MAX_NODES with nb_numa_nodes to keep code consistency and
reduce the loop times.
Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
numa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/numa.c b/numa.c
index e32af04..5f2916d 100644
--- a/numa.c
+++ b/numa.c
@@ -567,7 +567,7 @@ void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
}
memory_region_init(mr, owner, name, ram_size);
- for (i = 0; i < MAX_NODES; i++) {
+ for (i = 0; i < nb_numa_nodes; i++) {
uint64_t size = numa_info[i].node_mem;
HostMemoryBackend *backend = numa_info[i].node_memdev;
if (!backend) {
--
2.5.5
^ permalink raw reply related [flat|nested] 7+ messages in thread