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From c30a2c251e309eba40fd04e36b80016e4858c586 Mon Sep 17 00:00:00 2001
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From: Serhii Popovych <spopovyc@redhat.com>
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Date: Wed, 11 Jul 2018 17:11:45 +0100
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Subject: [PATCH 2/4] Revert "spapr: Don't allow memory hotplug to memory less
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nodes"
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RH-Author: Serhii Popovych <spopovyc@redhat.com>
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Message-id: <1531329105-80927-3-git-send-email-spopovyc@redhat.com>
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Patchwork-id: 81313
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O-Subject: [RHEL-8.0 qemu-kvm PATCH 2/2] Revert "spapr: Don't allow memory hotplug to memory less nodes"
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Bugzilla: 1599593
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: David Gibson <dgibson@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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This reverts commit b556854bd8524c26b8be98ab1bfdf0826831e793.
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Leave change @node type from uint32_t to to int from reverted commit
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because node < 0 is always false.
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Note that implementing capability or some trick to detect if guest
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kernel does not support hot-add to memory: this returns previous
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behavour where memory added to first non-empty node.
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Signed-off-by: Serhii Popovych <spopovyc@redhat.com>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit e47f1d2786c3d01a7894a493aafe0efa6b64453c)
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Signed-off-by: Serhii Popovych <spopovyc@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/ppc/spapr.c | 22 ----------------------
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1 file changed, 22 deletions(-)
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diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
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index f3da93f..ef00937 100644
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--- a/hw/ppc/spapr.c
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+++ b/hw/ppc/spapr.c
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@@ -3489,28 +3489,6 @@ static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
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return;
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}
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- /*
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- * Currently PowerPC kernel doesn't allow hot-adding memory to
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- * memory-less node, but instead will silently add the memory
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- * to the first node that has some memory. This causes two
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- * unexpected behaviours for the user.
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- *
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- * - Memory gets hotplugged to a different node than what the user
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- * specified.
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- * - Since pc-dimm subsystem in QEMU still thinks that memory belongs
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- * to memory-less node, a reboot will set things accordingly
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- * and the previously hotplugged memory now ends in the right node.
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- * This appears as if some memory moved from one node to another.
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- *
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- * So until kernel starts supporting memory hotplug to memory-less
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- * nodes, just prevent such attempts upfront in QEMU.
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- */
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- if (nb_numa_nodes && !numa_info[node].node_mem) {
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- error_setg(errp, "Can't hotplug memory to memory-less node %d",
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- node);
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- return;
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- }
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-
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spapr_memory_plug(hotplug_dev, dev, node, errp);
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} else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
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spapr_core_plug(hotplug_dev, dev, errp);
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--
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1.8.3.1
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