[Libguestfs] [v2v PATCH] convert/linux_kernels: fix virtio-socket check
Laszlo Ersek
lersek at redhat.com
Thu Mar 31 10:57:39 UTC 2022
The virtio-vsock support check from commit 05f780c16f01 ("v2v: support
configuration of viosock driver", 2021-02-26) is wrong; it looks for one
of two things:
- a module called "virtio_socket",
- a kernel config item called VIRTIO_SOCKET.
In reality, we need:
- the "vmw_vsock_virtio_transport" module,
- or the kernel config item VIRTIO_VSOCKETS.
Refer to Linux commit 304ba62fd4e6 ("VSOCK: Add Makefile and Kconfig",
2016-08-02).
Fix the parameters of the related "kernel_supports" call.
The same virt-v2v commit also missed extending the "print_kernel_info"
function; do that now as well.
I tested this patch by converting a RHEL-8.5 guest from libvirt to libvirt
(originally creating the guest with virt-builder). Relevant differences
between the "before" and "after" conversion logs:
> installed kernel packages in this guest:
> * kernel-core 4.18.0-348.el8.x86_64 (x86_64)
> /boot/vmlinuz-4.18.0-348.el8.x86_64
> /boot/initramfs-4.18.0-348.el8.x86_64.img
> /boot/config-4.18.0-348.el8.x86_64
> /lib/modules/4.18.0-348.el8.x86_64
> 2580 modules found
> virtio: blk=true net=true rng=true balloon=true
> - pvpanic=true xen=false debug=false
> + pvpanic=true vsock=true xen=false debug=false
and
> kernels offered by the bootloader in this guest (first in list is default):
> * kernel-core 4.18.0-348.el8.x86_64 (x86_64)
> /boot/vmlinuz-4.18.0-348.el8.x86_64
> /boot/initramfs-4.18.0-348.el8.x86_64.img
> /boot/config-4.18.0-348.el8.x86_64
> /lib/modules/4.18.0-348.el8.x86_64
> 2580 modules found
> virtio: blk=true net=true rng=true balloon=true
> - pvpanic=true xen=false debug=false
> + pvpanic=true vsock=true xen=false debug=false
> * kernel-core 4.18.0-348.el8.x86_64 (x86_64)
> /boot/vmlinuz-4.18.0-348.el8.x86_64
> /boot/initramfs-4.18.0-348.el8.x86_64.img
> /boot/config-4.18.0-348.el8.x86_64
> /lib/modules/4.18.0-348.el8.x86_64
> 2580 modules found
> virtio: blk=true net=true rng=true balloon=true
> - pvpanic=true xen=false debug=false
> + pvpanic=true vsock=true xen=false debug=false
and
> best kernel for this guest:
> * kernel-core 4.18.0-348.el8.x86_64 (x86_64)
> /boot/vmlinuz-4.18.0-348.el8.x86_64
> /boot/initramfs-4.18.0-348.el8.x86_64.img
> /boot/config-4.18.0-348.el8.x86_64
> /lib/modules/4.18.0-348.el8.x86_64
> 2580 modules found
> virtio: blk=true net=true rng=true balloon=true
> - pvpanic=true xen=false debug=false
> + pvpanic=true vsock=true xen=false debug=false
and
> gcaps_block_bus = virtio-blk
> gcaps_net_bus = virtio-net
> gcaps_virtio_rng = true
> gcaps_virtio_balloon = true
> gcaps_isa_pvpanic = true
> -gcaps_virtio_socket = false
> +gcaps_virtio_socket = true
> gcaps_machine = q35
> gcaps_arch = x86_64
> gcaps_acpi = true
> gcaps_virtio_1_0 = true
and
> resulting XML for libvirt:
> <?xml version='1.0' encoding='utf-8'?>
> <domain type='kvm'>
> <!-- generated by virt-v2v 2.0.1 -->
> <name>converted</name>
> <metadata>
> <libosinfo:libosinfo
> xmlns:libosinfo='http://libosinfo.org/xmlns/libvirt/domain/1.0'>
> <libosinfo:os id='http://redhat.com/rhel/8.5'/>
> </libosinfo:libosinfo>
> </metadata>
> <memory unit='KiB'>2097152</memory>
> <currentMemory unit='KiB'>2097152</currentMemory>
> <vcpu>2</vcpu>
> <features>
> <acpi/>
> <apic/>
> </features>
> <os>
> <type arch='x86_64' machine='q35'>hvm</type>
> </os>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
> <devices>
> <disk type='volume' device='disk'>
> <driver name='qemu' type='raw'/>
> <source pool='default' volume='converted-sda'/>
> <target dev='vda' bus='virtio'/>
> </disk>
> <interface type='bridge'>
> <source bridge='virbr0'/>
> <model type='virtio'/>
> <mac address='52:54:00:5c:cc:f8'/>
> </interface>
> <video>
> <model type='vga' vram='16384' heads='1'/>
> </video>
> <graphics type='spice' autoport='yes'/>
> <sound model='ich6'/>
> <rng model='virtio'>
> <backend model='random'>/dev/urandom</backend>
> </rng>
> <memballoon model='virtio'/>
> <panic model='isa'>
> <address type='isa' iobase='0x505'/>
> </panic>
> + <vsock model='virtio'/>
> <input type='tablet' bus='usb'/>
> <input type='mouse' bus='ps2'/>
> <console type='pty'/>
> </devices>
> </domain>
I also checked the device with "lspci", and the module with "lsmod", in
the converted domain.
Fixes: 05f780c16f0135c657615520c2245b42de1efc3e
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2070186
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
---
convert/linux_kernels.ml | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/convert/linux_kernels.ml b/convert/linux_kernels.ml
index 6dead217ef71..307de5729e3e 100644
--- a/convert/linux_kernels.ml
+++ b/convert/linux_kernels.ml
@@ -61,8 +61,9 @@ let print_kernel_info chan prefix ki =
fpf "virtio: blk=%b net=%b rng=%b balloon=%b\n"
ki.ki_supports_virtio_blk ki.ki_supports_virtio_net
ki.ki_supports_virtio_rng ki.ki_supports_virtio_balloon;
- fpf "pvpanic=%b xen=%b debug=%b\n"
- ki.ki_supports_isa_pvpanic ki.ki_is_xen_pv_only_kernel ki.ki_is_debug
+ fpf "pvpanic=%b vsock=%b xen=%b debug=%b\n"
+ ki.ki_supports_isa_pvpanic ki.ki_supports_virtio_socket
+ ki.ki_is_xen_pv_only_kernel ki.ki_is_debug
let rex_ko = PCRE.compile "\\.k?o(?:\\.xz)?$"
let rex_ko_extract = PCRE.compile "/([^/]+)\\.k?o(?:\\.xz)?$"
@@ -248,7 +249,7 @@ let detect_kernels (g : G.guestfs) inspect family bootloader =
let supports_isa_pvpanic =
kernel_supports "pvpanic" "PVPANIC" in
let supports_virtio_socket =
- kernel_supports "virtio_socket" "VIRTIO_SOCKET" in
+ kernel_supports "vmw_vsock_virtio_transport" "VIRTIO_VSOCKETS" in
let is_xen_pv_only_kernel =
check_config "X86_XEN" config_file ||
check_config "X86_64_XEN" config_file in
--
2.19.1.3.g30247aa5d201
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