42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Date: Mon, 6 Apr 2020 12:16:54 +0200
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Subject: [PATCH] PVE: [Compat]: 4.0 used balloon qemu-4-0-config-size false
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here
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The underlying issue why this change from upstream to us arised in
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the first place is that QEMU 4.0 was already released at the point we
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run into this migration issue, so we did the then obvious fallback to
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false for virtio-balloon-device qemu-4-0-config-size.
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QEMU made that switch back in 4.1, where it now uses a backward
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compatible mechanism to detect if the bigger CFG sizes should be
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used, i.e., checking the VIRTIO_BALLOON_F_PAGE_POISON or
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VIRTIO_BALLOON_F_FREE_PAGE_HINT balloon feature flags.
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As for them, upstream released version 4.0 had this to true they keep
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it to true in their compatibility record for the 4.0 machine, to
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allow live migrations from 4.0 to 4.1.
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As for us, downstream released version 4.0 (first public release of
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this QEMU) had this to false, we change it back to false again, for
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the same reason.
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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hw/core/machine.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/core/machine.c b/hw/core/machine.c
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index d0408049b5..5b38cf9356 100644
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--- a/hw/core/machine.c
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+++ b/hw/core/machine.c
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@@ -78,7 +78,8 @@ GlobalProperty hw_compat_4_0[] = {
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{ "virtio-vga", "edid", "false" },
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{ "virtio-gpu-device", "edid", "false" },
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{ "virtio-device", "use-started", "false" },
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- { "virtio-balloon-device", "qemu-4-0-config-size", "true" },
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+ // PVE differed from upstream for 4.0 balloon cfg size
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+ { "virtio-balloon-device", "qemu-4-0-config-size", "false" },
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{ "pl031", "migrate-tick-offset", "false" },
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};
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const size_t hw_compat_4_0_len = G_N_ELEMENTS(hw_compat_4_0);
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