88 lines
3.5 KiB
Diff
88 lines
3.5 KiB
Diff
From 4a1b30af56f99b9fe7ecdd47aa9691fed5d3a0c3 Mon Sep 17 00:00:00 2001
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From: Stefano Garzarella <sgarzare@redhat.com>
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Date: Tue, 9 Feb 2021 17:15:33 -0300
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Subject: [PATCH 04/54] virtio: move 'use-disabled-flag' property to
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hw_compat_4_2
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RH-Author: Stefano Garzarella <sgarzare@redhat.com>
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Message-id: <20210209171533.133268-2-sgarzare@redhat.com>
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Patchwork-id: 101012
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O-Subject: [RHEL-AV-8.4.0 qemu-kvm PATCH 1/1] virtio: move 'use-disabled-flag' property to hw_compat_4_2
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Bugzilla: 1907255
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RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Commit 9d7bd0826f introduced a new 'use-disabled-flag' property
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set to true by default.
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To allow the migration, we set this property to false in the hw_compat,
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but in the wrong place (hw_compat_4_1).
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Since commit 9d7bd0826f was released with QEMU 5.0, we move
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'use-disabled-flag' property to hw_compat_4_2, so 4.2 machine types
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will have the pre-patch behavior and the migration can work.
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The issue was discovered with vhost-vsock device and 4.2 machine
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type without running any kernel in the VM:
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$ qemu-4.2 -M pc-q35-4.2,accel=kvm \
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-device vhost-vsock-pci,guest-cid=4 \
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-monitor stdio -incoming tcp:0:3333
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$ qemu-5.2 -M pc-q35-4.2,accel=kvm \
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-device vhost-vsock-pci,guest-cid=3 \
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-monitor stdio
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(qemu) migrate -d tcp:0:3333
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# qemu-4.2 output
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qemu-system-x86_64: Failed to load virtio-vhost_vsock:virtio
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qemu-system-x86_64: error while loading state for instance 0x0 of device '0000:00:03.0/virtio-vhost_vsock'
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qemu-system-x86_64: load of migration failed: No such file or directory
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Reported-by: Jing Zhao <jinzhao@redhat.com>
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Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1907255
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Fixes: 9d7bd0826f ("virtio-pci: disable vring processing when bus-mastering is disabled")
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Cc: mdroth@linux.vnet.ibm.com
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CC: qemu-stable@nongnu.org
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Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
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Message-Id: <20210108171252.209502-1-sgarzare@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 c126b4c57e0164549de606ca35d1512762051083)
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[sgarzare: add 'use-disabled-flag' property to hw_compat_rhel_8_2]
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Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
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Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>
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---
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hw/core/machine.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/hw/core/machine.c b/hw/core/machine.c
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index 68495b9411..92398966a4 100644
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--- a/hw/core/machine.c
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+++ b/hw/core/machine.c
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@@ -77,6 +77,8 @@ GlobalProperty hw_compat_rhel_8_2[] = {
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{ "qxl-vga", "revision", "4" },
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/* hw_compat_rhel_8_2 from hw_compat_4_2 */
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{ "fw_cfg", "acpi-mr-restore", "false" },
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+ /* hw_compat_rhel_8_2 from hw_compat_4_2 */
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+ { "virtio-device", "use-disabled-flag", "false" },
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/* hw_compat_rhel_8_2 from hw_compat_5_0 */
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{ "pci-host-bridge", "x-config-reg-migration-enabled", "off" },
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/* hw_compat_rhel_8_2 from hw_compat_5_0 */
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@@ -298,12 +300,12 @@ GlobalProperty hw_compat_4_2[] = {
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{ "qxl", "revision", "4" },
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{ "qxl-vga", "revision", "4" },
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{ "fw_cfg", "acpi-mr-restore", "false" },
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+ { "virtio-device", "use-disabled-flag", "false" },
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};
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const size_t hw_compat_4_2_len = G_N_ELEMENTS(hw_compat_4_2);
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GlobalProperty hw_compat_4_1[] = {
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{ "virtio-pci", "x-pcie-flr-init", "off" },
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- { "virtio-device", "use-disabled-flag", "false" },
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};
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const size_t hw_compat_4_1_len = G_N_ELEMENTS(hw_compat_4_1);
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--
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2.27.0
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