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From b6eb914119af7e724cbee27951cfba0a6afb3b97 Mon Sep 17 00:00:00 2001
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Message-Id: <b6eb914119af7e724cbee27951cfba0a6afb3b97@dist-git>
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From: Peter Krempa <pkrempa@redhat.com>
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Date: Thu, 19 Jan 2023 15:06:11 +0100
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Subject: [PATCH] qemu: hotplug: Remove legacy quirk for 'dimm' address
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generation
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Commit b7798a07f93 (in fall of 2016) changed the way we generate aliases
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for 'dimm' memory devices as the alias itself is part of the migration
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stream section naming and thus must be treated as ABI.
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The code added compatibility layer for VMs with memory hotplug started
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with the old scheme to prevent from generating wrong aliases. The
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compatibility layer broke though later when 'nvdimm' and 'pmem' devices
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were introduced as it wrongly detected them as old configuration.
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Now rather than attempting to fix the legacy compat layer to treat other
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devices properly we'll be better off simply removing it as it's
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extremely unlikely that somebody has a VM started in 2016 running with
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today's libvirt and attempts to hotplug more memory.
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This fixes a corner case when a user hot-adds a 'dimm' into a VM with a
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'dimm' and a 'nvdimm' after restart of libvirtd and then attempts to
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migrate the VM.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2158701
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Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
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(cherry picked from commit 50ce3463d514950350143f03e8421c8c31889c5d)
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---
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src/qemu/qemu_hotplug.c | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
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index 026e1ee5ad..5840504d13 100644
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--- a/src/qemu/qemu_hotplug.c
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+++ b/src/qemu/qemu_hotplug.c
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@@ -2275,9 +2275,7 @@ qemuDomainAttachMemory(virQEMUDriver *driver,
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goto cleanup;
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releaseaddr = true;
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- /* in cases where we are using a VM with aliases generated according to the
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- * index of the memory device we need to keep continue using that scheme */
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- if (qemuAssignDeviceMemoryAlias(vm->def, mem, priv->memAliasOrderMismatch) < 0)
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+ if (qemuAssignDeviceMemoryAlias(vm->def, mem, false) < 0)
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goto cleanup;
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objalias = g_strdup_printf("mem%s", mem->info.alias);
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--
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2.39.1
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