File 0085-pc-acpi-fix-memory-hotplug-regressi.patch of Package qemu.13117
From 709a1154804b7845bcbf18c44e2740e9d4549540 Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo@redhat.com>
Date: Mon, 30 Jul 2018 11:41:41 +0200
Subject: [PATCH] pc: acpi: fix memory hotplug regression by reducing stub SRAT
entry size
Commit 848a1cc1e (hw/acpi-build: build SRAT memory affinity structures for DIMM devices)
broke the first dimm hotplug in following cases:
1: there is no coldplugged dimm in the last numa node
but there is a coldplugged dimm in another node
-m 4096,slots=4,maxmem=32G \
-object memory-backend-ram,id=m0,size=2G \
-device pc-dimm,memdev=m0,node=0 \
-numa node,nodeid=0 \
-numa node,nodeid=1
2: if order of dimms on CLI is:
1st plugged dimm in node1
2nd plugged dimm in node0
-m 4096,slots=4,maxmem=32G \
-object memory-backend-ram,size=2G,id=m0 \
-device pc-dimm,memdev=m0,node=1 \
-object memory-backend-ram,id=m1,size=2G \
-device pc-dimm,memdev=m1,node=0 \
-numa node,nodeid=0 \
-numa node,nodeid=1
(qemu) object_add memory-backend-ram,id=m2,size=1G
(qemu) device_add pc-dimm,memdev=m2,node=0
the first DIMM hotplug to any node except the last one
fails (Windows is unable to online it).
Length reduction of stub hotplug memory SRAT entry,
fixes issue for some reason.
RHBZ: 1609234
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 10efd7e1088855dc019e6a248ac7f9b24af8dd26)
[BR: FATE#325135]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
hw/i386/acpi-build.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 050ab19475..1eb31aadd7 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2309,7 +2309,16 @@ static void build_srat_hotpluggable_memory(GArray *table_data, uint64_t base,
numamem = acpi_data_push(table_data, sizeof *numamem);
if (!info) {
- build_srat_memory(numamem, cur, end - cur, default_node,
+ /*
+ * Entry is required for Windows to enable memory hotplug in OS
+ * and for Linux to enable SWIOTLB when booted with less than
+ * 4G of RAM. Windows works better if the entry sets proximity
+ * to the highest NUMA node in the machine at the end of the
+ * reserved space.
+ * Memory devices may override proximity set by this entry,
+ * providing _PXM method if necessary.
+ */
+ build_srat_memory(numamem, end - 1, 1, default_node,
MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED);
break;
}
@@ -2442,14 +2451,6 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
build_srat_memory(numamem, 0, 0, 0, MEM_AFFINITY_NOFLAGS);
}
- /*
- * Entry is required for Windows to enable memory hotplug in OS
- * and for Linux to enable SWIOTLB when booted with less than
- * 4G of RAM. Windows works better if the entry sets proximity
- * to the highest NUMA node in the machine.
- * Memory devices may override proximity set by this entry,
- * providing _PXM method if necessary.
- */
if (hotplugabble_address_space_size) {
build_srat_hotpluggable_memory(table_data, pcms->hotplug_memory.base,
hotplugabble_address_space_size,
