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From 6d5bc18c3af1969cfcaea9c9bafb5ad0d32bb163 Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Tue, 7 Aug 2018 12:33:52 +0200
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Subject: [PATCH 05/13] pc: acpi: fix memory hotplug regression by reducing
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stub SRAT entry size
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RH-Author: Igor Mammedov <imammedo@redhat.com>
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Message-id: <1533645232-98572-1-git-send-email-imammedo@redhat.com>
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Patchwork-id: 81662
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH] pc: acpi: fix memory hotplug regression by reducing stub SRAT entry size
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Bugzilla: 1609234
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1609234
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Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=17640116
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Branch: rhv7/master-2.12.0
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1: there is no coldplugged dimm in the last numa node
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but there is a coldplugged dimm in another node
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-m 4096,slots=4,maxmem=32G \
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-object memory-backend-ram,id=m0,size=2G \
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-device pc-dimm,memdev=m0,node=0 \
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-numa node,nodeid=0 \
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-numa node,nodeid=1
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2: if order of dimms on CLI is:
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1st plugged dimm in node1
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2nd plugged dimm in node0
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-m 4096,slots=4,maxmem=32G \
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-object memory-backend-ram,size=2G,id=m0 \
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-device pc-dimm,memdev=m0,node=1 \
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-object memory-backend-ram,id=m1,size=2G \
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-device pc-dimm,memdev=m1,node=0 \
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-numa node,nodeid=0 \
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-numa node,nodeid=1
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(qemu) object_add memory-backend-ram,id=m2,size=1G
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(qemu) device_add pc-dimm,memdev=m2,node=0
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the first DIMM hotplug to any node except the last one
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fails (Windows is unable to online it).
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Length reduction of stub hotplug memory SRAT entry,
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fixes issue for some reason.
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RHBZ: 1609234
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Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 10efd7e1088855dc019e6a248ac7f9b24af8dd26)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/i386/acpi-build.c | 19 ++++++++++---------
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1 file changed, 10 insertions(+), 9 deletions(-)
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diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
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index b309a97..683e5f4 100644
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--- a/hw/i386/acpi-build.c
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+++ b/hw/i386/acpi-build.c
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@@ -2271,7 +2271,16 @@ static void build_srat_hotpluggable_memory(GArray *table_data, uint64_t base,
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numamem = acpi_data_push(table_data, sizeof *numamem);
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if (!info) {
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- build_srat_memory(numamem, cur, end - cur, default_node,
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+ /*
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+ * Entry is required for Windows to enable memory hotplug in OS
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+ * and for Linux to enable SWIOTLB when booted with less than
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+ * 4G of RAM. Windows works better if the entry sets proximity
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+ * to the highest NUMA node in the machine at the end of the
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+ * reserved space.
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+ * Memory devices may override proximity set by this entry,
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+ * providing _PXM method if necessary.
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+ */
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+ build_srat_memory(numamem, end - 1, 1, default_node,
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MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED);
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break;
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}
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@@ -2404,14 +2413,6 @@ build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
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build_srat_memory(numamem, 0, 0, 0, MEM_AFFINITY_NOFLAGS);
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}
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- /*
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- * Entry is required for Windows to enable memory hotplug in OS
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- * and for Linux to enable SWIOTLB when booted with less than
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- * 4G of RAM. Windows works better if the entry sets proximity
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- * to the highest NUMA node in the machine.
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- * Memory devices may override proximity set by this entry,
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- * providing _PXM method if necessary.
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- */
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if (hotplugabble_address_space_size) {
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build_srat_hotpluggable_memory(table_data, pcms->hotplug_memory.base,
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hotplugabble_address_space_size,
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--
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1.8.3.1
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