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50 lines
1.9 KiB
50 lines
1.9 KiB
4 weeks ago
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From cd94a5c750554f21ddbff37f53ff629128200259 Mon Sep 17 00:00:00 2001
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From: "Michael S. Tsirkin" <mst@redhat.com>
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Date: Wed, 6 Nov 2024 17:29:35 -0500
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Subject: [PATCH 2/3] virtio-net: disable USO for RHEL9
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RH-Author: MST <mst@redhat.com>
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RH-MergeRequest: 289: Disable USO for virtio-net to fix RHEL10 to RHEL9 migration
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RH-Jira: RHEL-40950
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [1/1] 9fc588b66c5bad72df1e9b644f48a2a7aa82bfa3 (mstredhat/qemu-kvm-centos)
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Theoretically, QEMU from RHEL9.3 and on supports USO,
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but practically we clear the support because RHEL9
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kernels do not support that.
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Now that RHEL10 beta does we suddenly get a migration compatibility
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issue. We should not have enabled the feature in RHEL9 userspace,
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but luckily, it's not too late to fix that.
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Note: if we ever change RHEL9 kernel to enable USO, we will need to
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mask this in RHEL9 QEMU, too.
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Upstream status: n/a: upstream has no guarantee if kernel features change
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Tested: lightly on developer's machine.
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JIRA: https://issues.redhat.com/browse/RHEL-40950
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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---
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hw/core/machine.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/hw/core/machine.c b/hw/core/machine.c
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index d95f246f66..04d180eac4 100644
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--- a/hw/core/machine.c
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+++ b/hw/core/machine.c
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@@ -337,6 +337,11 @@ GlobalProperty hw_compat_rhel_9_5[] = {
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{ TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "64" },
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/* hw_compat_rhel_9_5 from hw_compat_8_2 */
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{ "virtio-gpu-device", "x-scanout-vmstate-version", "1" },
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+ /* supported by userspace, but RHEL 9 *kernels* do not support USO. */
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+ /* TODO: if we ever add 9.6 compat, this has to be there, too */
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+ { TYPE_VIRTIO_NET, "host_uso", "off"},
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+ { TYPE_VIRTIO_NET, "guest_uso4", "off"},
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+ { TYPE_VIRTIO_NET, "guest_uso6", "off"},
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};
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const size_t hw_compat_rhel_9_5_len = G_N_ELEMENTS(hw_compat_rhel_9_5);
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--
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2.39.3
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