Error : virHostCPUGetKVMMaxVCPUs:1228 : KVM is not supported on this platform: Function not implemented.
2:22 p.m.
Hello.
I'm running Debian bookworm on my ARM Chromebook,model "xe303c12" and
I've recompiled the kernel (5.4) to enable KVM,so now my system sounds like
this :
$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
$ uname -a
Linux chromarietto 5.4.244-stb-cbe
#8 SMP PREEMPT Sat Aug 19 22:19:32 UTC 2023 armv7l GNU/Linux
$ uname -r
5.4.244-stb-cbe
$ kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
$ qemu-system-arm --version
QEMU emulator version 5.1.0 (v5.1.0-dirty)
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
$ python3 --version
Python 3.11.2
I have installed libvirt 9.7.0,qemu 5.1 and virt-manager from source
code with the final goal to be able to connect qemu,kvm and libvirt
together to virtualize FreeBSD 13.2 for arm 32 bit.
Some useful informations about my platform :
root@chromarietto:/home/marietto/Desktop# virt-host-validate
QEMU: Checking if device /dev/kvm exists : PASS
QEMU: Checking if device /dev/kvm is accessible : PASS
QEMU: Checking if device /dev/vhost-net exists : PASS
QEMU: Checking if device /dev/net/tun exists : PASS
QEMU: Checking for cgroup 'cpu' controller support : PASS
QEMU: Checking for cgroup 'cpuacct' controller support : PASS
QEMU: Checking for cgroup 'cpuset' controller support : PASS
QEMU: Checking for cgroup 'memory' controller support : PASS
QEMU: Checking for cgroup 'devices' controller support : PASS
QEMU: Checking for cgroup 'blkio' controller support : PASS
QEMU: Checking for device assignment IOMMU support
: WARN
(No ACPI IORT table found, IOMMU not supported by this hardware platform)
QEMU: Checking for secure guest support
: WARN
(Unknown if this platform has Secure Guest support)
LXC: Checking for Linux >= 2.6.26 : PASS
LXC: Checking for namespace ipc : PASS
LXC: Checking for namespace mnt : PASS
LXC: Checking for namespace pid : PASS
LXC: Checking for namespace uts : PASS
LXC: Checking for namespace net : PASS
LXC: Checking for namespace user : PASS
LXC: Checking for cgroup 'cpu' controller support : PASS
LXC: Checking for cgroup 'cpuacct' controller support : PASS
LXC: Checking for cgroup 'cpuset' controller support : PASS
LXC: Checking for cgroup 'memory' controller support : PASS
LXC: Checking for cgroup 'devices' controller support : PASS
LXC: Checking for cgroup 'freezer' controller support : FAIL
(Enable 'freezer' in kernel Kconfig file or mount/enable cgroup
controller in your system)
LXC: Checking for cgroup 'blkio' controller support : PASS
LXC: Checking if device /sys/fs/fuse/connections exists : PASS
# lsmod | grep kvm
no errors (I have embedded the options needed to enable KVM inside the kernel)
# virsh --connect qemu:///system capabilities | grep baselabel
<baselabel type='kvm'>+1002:+1002</baselabel>
<baselabel type='qemu'>+1002:+1002</baselabel>
The error that I'm not able to fix is the following one :
root@chromarietto:~# virsh domcapabilities --machine virt
--emulatorbin /usr/local/bin/qemu-system-arm
2023-08-29 10:17:59.110+0000: 1763: error : virHostCPUGetKVMMaxVCPUs:1228 :
KVM is not supported on this platform: Function not implemented ;
error: failed to get emulator capabilities
error: KVM is not supported on this platform: Function not implemented
and this is the log that I've got when I ran libvirtd with the debug
option enabled
root@chromarietto:~# libvirtd --debug
[Tue, 29 Aug 2023 10:10:11 virt-manager 2141] DEBUG (createvm:494)
UEFI found, setting it as default.
[Tue, 29 Aug 2023 10:10:11 virt-manager 2141] DEBUG (createvm:728)
Guest type set to os_type=hvm, arch=armv7l, dom_type=kvm
[Tue, 29 Aug 2023 10:10:11 virt-manager 2141] DEBUG (guest:546) Prefer
EFI => True
2023-08-29 10:10:12.972+0000: 1765: error :
virHostCPUGetKVMMaxVCPUs:1228 : KVM is not supported on this platform:
Function not implemented
[Tue, 29 Aug 2023 10:10:12 virt-manager 2141] DEBUG
(domcapabilities:250) Error fetching domcapabilities XML
Traceback (most recent call last):
File "/usr/local/share/virt-manager/virtinst/domcapabilities.py",
line 245, in build_from_params
xml = conn.getDomainCapabilities(emulator, arch,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/libvirt.py", line 4612, in
getDomainCapabilities
raise libvirtError('virConnectGetDomainCapabilities() failed')
libvirt.libvirtError: KVM is not supported on this platform: Function
not implemented
*2023-08-29 10:10:14.157+0000: 1762: error : virHostCPUGetKVMMaxVCPUs:1228
: KVM is not supported on this platform: Function not implemented*
[Tue, 29 Aug 2023 10:10:14 virt-manager 2141] DEBUG
(domcapabilities:250) Error fetching domcapabilities XML
Traceback (most recent call last):
File "/usr/local/share/virt-manager/virtinst/domcapabilities.py",
line 245, in build_from_params
xml = conn.getDomainCapabilities(emulator, arch,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/libvirt.py", line 4612, in
getDomainCapabilities
raise libvirtError('virConnectGetDomainCapabilities() failed')
libvirt.libvirtError: KVM is not supported on this platform: Function
not implemented
[Tue, 29 Aug 2023 10:10:14 virt-manager 2141] DEBUG (createvm:497)
Error checking for UEFI default
Traceback (most recent call last):
File "/usr/local/share/virt-manager/virtManager/createvm.py", line
491, in _set_caps_state
guest.enable_uefi()
File "/usr/local/share/virt-manager/virtinst/guest.py", line 589, in
enable_uefi
path = self._lookup_default_uefi_path()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/share/virt-manager/virtinst/guest.py", line 848, in
_lookup_default_uefi_path
raise RuntimeError(_("Libvirt version does not support UEFI."))
RuntimeError: Libvirt version does not support UEFI
Does anyone know how to fix that error ?
--
Mario.
1:36 a.m.
On 8/29/23 21:22, Mario Marietto wrote:
Hello.
The error that I'm not able to fix is the following one :
root@chromarietto:~# virsh domcapabilities --machine virt
--emulatorbin /usr/local/bin/qemu-system-arm
2023-08-29 10:17:59.110+0000: 1763: error : virHostCPUGetKVMMaxVCPUs:1228 :
KVM is not supported on this platform: Function not implemented ;
error: failed to get emulator capabilities
error: KVM is not supported on this platform: Function not implemented
This is the source code that reports that error:
https://gitlab.com/libvirt/libvirt/-/blob/master/src/util/virhostcpu.c?re...
Long story short, you are missing kvm.h header. On my system it's
located under: /usr/include/linux/kvm.h and provided by linux-headers
package.
And if you think about it (and take a look at the other implementation
of the function), it kind of makes sense - libvirt opens /dev/kvm and
calls series of ioctl()-s to learn about KVM capabilities. Libvirt
shouldn't hard code values but rather use the ones provided by kernel
header files.
Happy hacking!
Michal
2:46 a.m.
On Tue, Aug 29, 2023 at 09:22:35PM +0200, Mario Marietto wrote:
Hello.
I'm running Debian bookworm on my ARM Chromebook,model "xe303c12" and
I've recompiled the kernel (5.4) to enable KVM,so now my system sounds like
this :
That's surely not the default kernel that comes with Debian bookworm,
as that 5.4 version is many years old.
IIUC the standard bookworm kernel will be 6.4
root@chromarietto:~# virsh domcapabilities --machine virt
--emulatorbin /usr/local/bin/qemu-system-arm
2023-08-29 10:17:59.110+0000: 1763: error : virHostCPUGetKVMMaxVCPUs:1228 :
KVM is not supported on this platform: Function not implemented ;
error: failed to get emulator capabilities
error: KVM is not supported on this platform: Function not implemented
This shows libvirt was built against a kernel that lacks the
kvm.h header file.
This is expected for armv7 as support for KVM on 32-bit arm was
deleted in the 5.7 kernel. I expect libvirt was built against
the kernel headers from Debian's default 6.4 kernel and thus
lacks KVM support.
Your booting of the old 5.4 kernel doesn't solve this - you
would actually need to build libvirt (and QEMU) against this
outdated kernel too.
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
4:11 a.m.
Ok. thanks. Yes,I'm obliged to use a kernel minor than 5.7 and I've chosen
5.4. These are the places where I've found the kvm.h file that I need.
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/include/sysemu/kvm.h
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/asm-arm/kvm.h
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/include/uapi/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/arch/arm/include/uapi/asm/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/uapi/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/config/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/trace/events/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/arch/arm/include/uapi/asm/kvm.h
Basically it seems that I can get it from the qemu 5.1 or from the kernel
5.4 source code files. Can you tell me what's the correct one ? You talked
about linux-headers,so it might be this :
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
?
where should I copy it ? to /usr/include/linux is the right place ?
thanks.
On Wed, Aug 30, 2023 at 9:46 AM Daniel P. Berrangé <berrange(a)redhat.com>
wrote:
On Tue, Aug 29, 2023 at 09:22:35PM +0200, Mario Marietto wrote:
> Hello.
>
> I'm running Debian bookworm on my ARM Chromebook,model "xe303c12" and
> I've recompiled the kernel (5.4) to enable KVM,so now my system sounds
like
> this :
That's surely not the default kernel that comes with Debian bookworm,
as that 5.4 version is many years old.
IIUC the standard bookworm kernel will be 6.4
> root@chromarietto:~# virsh domcapabilities --machine virt
> --emulatorbin /usr/local/bin/qemu-system-arm
>
> 2023-08-29 10:17:59.110+0000: 1763: error :
virHostCPUGetKVMMaxVCPUs:1228 :
> KVM is not supported on this platform: Function not implemented ;
> error: failed to get emulator capabilities
> error: KVM is not supported on this platform: Function not implemented
This shows libvirt was built against a kernel that lacks the
kvm.h header file.
This is expected for armv7 as support for KVM on 32-bit arm was
deleted in the 5.7 kernel. I expect libvirt was built against
the kernel headers from Debian's default 6.4 kernel and thus
lacks KVM support.
Your booting of the old 5.4 kernel doesn't solve this - you
would actually need to build libvirt (and QEMU) against this
outdated kernel too.
With regards,
Daniel
--
|: https://berrange.com -o-
https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o-
https://fstop138.berrange.com :|
|: https://entangle-photo.org -o-
https://www.instagram.com/dberrange :|
--
Mario.
4:19 a.m.
ok. I've copied this file :
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
to this directory :
/usr/include/linux
the previous error is gone,but it still doesn't work :
# virsh domcapabilities --machine virt --emulatorbin
/usr/local/bin/qemu-system-arm
error: failed to get emulator capabilities
error: KVM is not supported on this platform: Function not implemented
this time there isn't any specific error :(
On Wed, Aug 30, 2023 at 11:11 AM Mario Marietto <marietto2008(a)gmail.com>
wrote:
Ok. thanks. Yes,I'm obliged to use a kernel minor than 5.7 and
I've chosen
5.4. These are the places where I've found the kvm.h file that I need.
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/include/sysemu/kvm.h
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/asm-arm/kvm.h
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/include/uapi/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/arch/arm/include/uapi/asm/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/uapi/linux/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/config/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/trace/events/kvm.h
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/arch/arm/include/uapi/asm/kvm.h
Basically it seems that I can get it from the qemu 5.1 or from the kernel
5.4 source code files. Can you tell me what's the correct one ? You talked
about linux-headers,so it might be this :
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
?
where should I copy it ? to /usr/include/linux is the right place ?
thanks.
On Wed, Aug 30, 2023 at 9:46 AM Daniel P. Berrangé <berrange(a)redhat.com>
wrote:
> On Tue, Aug 29, 2023 at 09:22:35PM +0200, Mario Marietto wrote:
> > Hello.
> >
> > I'm running Debian bookworm on my ARM Chromebook,model "xe303c12"
and
> > I've recompiled the kernel (5.4) to enable KVM,so now my system sounds
> like
> > this :
>
> That's surely not the default kernel that comes with Debian bookworm,
> as that 5.4 version is many years old.
>
> IIUC the standard bookworm kernel will be 6.4
>
> > root@chromarietto:~# virsh domcapabilities --machine virt
> > --emulatorbin /usr/local/bin/qemu-system-arm
> >
> > 2023-08-29 10:17:59.110+0000: 1763: error :
> virHostCPUGetKVMMaxVCPUs:1228 :
> > KVM is not supported on this platform: Function not implemented ;
> > error: failed to get emulator capabilities
> > error: KVM is not supported on this platform: Function not implemented
>
> This shows libvirt was built against a kernel that lacks the
> kvm.h header file.
>
> This is expected for armv7 as support for KVM on 32-bit arm was
> deleted in the 5.7 kernel. I expect libvirt was built against
> the kernel headers from Debian's default 6.4 kernel and thus
> lacks KVM support.
>
> Your booting of the old 5.4 kernel doesn't solve this - you
> would actually need to build libvirt (and QEMU) against this
> outdated kernel too.
>
>
> With regards,
> Daniel
> --
> |: https://berrange.com -o-
> https://www.flickr.com/photos/dberrange :|
> |: https://libvirt.org -o-
> https://fstop138.berrange.com :|
> |: https://entangle-photo.org -o-
> https://www.instagram.com/dberrange :|
>
>
--
Mario.
--
Mario.
10:02 a.m.
So. ok. If I understood correctly : In my system the file kvm.h is missing.
I should install the kernel headers file if I want it. I could do this if
the kernel in use was 6.1,but I'm forced to use 5.4. I can't install the
kernel headers for the kernel 5.4 on top of debian bookworm. Or at least,at
the moment I don't know how to do this. I'm not sure that the kernel
headers for the 5.4 kernel are present between the packages. Or maybe I can
build it from scratch or I can find it somewhere ? Even in this case, I'm
not sure that they will work on a system that has been compiled on top of a
6.x kernel. I think that I should re-compile libvirt and QEMU on top of the
5.4 kernel and for this reason I should use an older version of
Debian,maybe 8 or 9. Maybe later,I can upgrade the userland from 8/9 to
12,keeping intact the same kernel. What do you think ? Do you see a shorter
solution ? for sure I don't like to reinstall and recompile everything on
an older version of Linux.
On Wed, Aug 30, 2023 at 11:19 AM Mario Marietto <marietto2008(a)gmail.com>
wrote:
ok. I've copied this file :
/home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
to this directory :
/usr/include/linux
the previous error is gone,but it still doesn't work :
# virsh domcapabilities --machine virt --emulatorbin
/usr/local/bin/qemu-system-arm
error: failed to get emulator capabilities
error: KVM is not supported on this platform: Function not implemented
this time there isn't any specific error :(
On Wed, Aug 30, 2023 at 11:11 AM Mario Marietto <marietto2008(a)gmail.com>
wrote:
> Ok. thanks. Yes,I'm obliged to use a kernel minor than 5.7 and I've
> chosen 5.4. These are the places where I've found the kvm.h file that I
> need.
>
> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/include/sysemu/kvm.h
> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/asm-arm/kvm.h
> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
>
> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/include/uapi/linux/kvm.h
>
>
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/arch/arm/include/uapi/asm/kvm.h
>
> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/uapi/linux/kvm.h
> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/config/kvm.h
> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/trace/events/kvm.h
>
> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/arch/arm/include/uapi/asm/kvm.h
>
>
> Basically it seems that I can get it from the qemu 5.1 or from the kernel
> 5.4 source code files. Can you tell me what's the correct one ? You talked
> about linux-headers,so it might be this :
>
> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
>
> ?
>
> where should I copy it ? to /usr/include/linux is the right place ?
>
> thanks.
>
>
>
> On Wed, Aug 30, 2023 at 9:46 AM Daniel P. Berrangé <berrange(a)redhat.com>
> wrote:
>
>> On Tue, Aug 29, 2023 at 09:22:35PM +0200, Mario Marietto wrote:
>> > Hello.
>> >
>> > I'm running Debian bookworm on my ARM Chromebook,model
"xe303c12" and
>> > I've recompiled the kernel (5.4) to enable KVM,so now my system sounds
>> like
>> > this :
>>
>> That's surely not the default kernel that comes with Debian bookworm,
>> as that 5.4 version is many years old.
>>
>> IIUC the standard bookworm kernel will be 6.4
>>
>> > root@chromarietto:~# virsh domcapabilities --machine virt
>> > --emulatorbin /usr/local/bin/qemu-system-arm
>> >
>> > 2023-08-29 10:17:59.110+0000: 1763: error :
>> virHostCPUGetKVMMaxVCPUs:1228 :
>> > KVM is not supported on this platform: Function not implemented ;
>> > error: failed to get emulator capabilities
>> > error: KVM is not supported on this platform: Function not implemented
>>
>> This shows libvirt was built against a kernel that lacks the
>> kvm.h header file.
>>
>> This is expected for armv7 as support for KVM on 32-bit arm was
>> deleted in the 5.7 kernel. I expect libvirt was built against
>> the kernel headers from Debian's default 6.4 kernel and thus
>> lacks KVM support.
>>
>> Your booting of the old 5.4 kernel doesn't solve this - you
>> would actually need to build libvirt (and QEMU) against this
>> outdated kernel too.
>>
>>
>> With regards,
>> Daniel
>> --
>> |: https://berrange.com -o-
>> https://www.flickr.com/photos/dberrange :|
>> |: https://libvirt.org -o-
>> https://fstop138.berrange.com :|
>> |: https://entangle-photo.org -o-
>> https://www.instagram.com/dberrange :|
>>
>>
>
> --
> Mario.
>
--
Mario.
--
Mario.
12:19 p.m.
Hello.
I'm trying to compile libvirt from scratch on my ARM chromebook using
Ubuntu 22.04 as host os where I have recompiled the kernel 5.4.244 enabling
kvm, also recompiling qemu 5.1 from scratch and where I have installed
these kernel sources and libraries :
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.244/armhf/linux-heade...
44- <goog_504463333>0504244.202305301242_armhf.deb
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.244/armhf/linux-image...
- <goog_504463330>0504244.202305301242_armhf.deb
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.244/armhf/linux-modul...
44- <goog_504463329>0504244.202305301242_armhf.deb
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4.244/amd64/linux-heade...
44.202305301242_all.deb
dpkg -i
linux-headers-5.4.244-0504244-generic_5.4.244-0504244.202305301242_armhf.deb
dpkg -i linux-headers-5.4.244-0504244_5.4.244-0504244.202305301242_all.deb
dpkg -i
linux-image-5.4.244-0504244-generic_5.4.244-0504244.202305301242_armhf.deb
dpkg -i
linux-modules-5.4.244-0504244-generic_5.4.244-0504244.202305301242_armhf.deb
be careful about the version of those files. It is the same version of the
kernel that I'm using,5.4.244 :
# uname -a
Linux chromarietto 5.4.244 #9 SMP Mon Aug 28 16:14:27 UTC 2023 armv7l
armv7l armv7l GNU/Linux
The idea behind is to place the correct files needed by libvirt to the
right places.
Unfortunately I haven't reached the solution yet,as you can see below. Can
you tell me which files libvirt wants to find and into which directories it
wants them ? thanks :
root@chromarietto:/Dati/libvirt# ninja -C build
ninja: Entering directory `build'
[64/1485] Compiling C object src/util/libvirt_util.a.p/virhostcpu.c.o
FAILED: src/util/libvirt_util.a.p/virhostcpu.c.o
cc -Isrc/util/libvirt_util.a.p -Isrc/util -I../src/util -Iinclude
-I../include -Isrc -I../src -I. -I.. -I/usr/include/p11-kit-1 -I/usr/
include/libnl3 -I/usr/include/glib-2.0
-I/usr/lib/arm-linux-gnueabihf/glib-2.0/include -I/usr/include/gio-unix-2.0
-I/usr/include/libmo
unt -I/usr/include/blkid -I/usr/include/libxml2 -I/usr/include/yajl
-fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-p
ch -Wextra -std=gnu99 -O2 -g -Werror -fasynchronous-unwind-tables
-fexceptions -fipa-pure-const -fno-common -Wabsolute-value -Waddress
-Waddress-of-packed-member -Waggressive-loop-optimizations
-Walloc-size-larger-than=2147483647 -Walloca -Warray-bounds=2 -Wattribute-al
ias=2 -Wattribute-warning -Wattributes -Wbool-compare -Wbool-operation
-Wbuiltin-declaration-mismatch -Wbuiltin-macro-redefined -Wcanno
t-profile -Wcast-align -Wcast-align=strict -Wno-cast-function-type
-Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismat
ch -Wcpp -Wdangling-else -Wdate-time -Wdeclaration-after-statement
-Wdeprecated-declarations -Wdesignated-init -Wdiscarded-array-qualif
iers -Wdiscarded-qualifiers -Wdiv-by-zero -Wduplicated-cond
-Wduplicate-decl-specifier -Wempty-body -Wendif-labels -Wexpansion-to-defin
ed -Wformat-contains-nul -Wformat-extra-args -Wno-format-nonliteral
-Wformat-overflow=2 -Wformat-security -Wno-format-truncation -Wform
at-y2k -Wformat-zero-length -Wframe-address -Wframe-larger-than=2048
-Wfree-nonheap-object -Whsa -Wif-not-aligned -Wignored-attributes
-Wignored-qualifiers -Wimplicit -Wimplicit-fallthrough=5
-Wimplicit-function-declaration -Wimplicit-int -Wincompatible-pointer-types
-W
init-self -Winline -Wint-conversion -Wint-in-bool-context
-Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch
-Wjump-misses-init
-Wlogical-not-parentheses -Wlogical-op -Wmain -Wmaybe-uninitialized
-Wmemset-elt-size -Wmemset-transposed-args -Wmisleading-indentatio
n -Wmissing-attributes -Wmissing-braces -Wmissing-declarations
-Wmissing-field-initializers -Wmissing-include-dirs -Wmissing-parameter-
type -Wmissing-profile -Wmissing-prototypes -Wmultichar
-Wmultistatement-macros -Wnarrowing -Wnested-externs -Wnonnull
-Wnonnull-compar
e -Wnormalized=nfc -Wnull-dereference -Wodr -Wold-style-declaration
-Wold-style-definition -Wopenmp-simd -Woverflow -Woverride-init -Wp
acked-bitfield-compat -Wpacked-not-aligned -Wparentheses -Wpointer-arith
-Wpointer-compare -Wpointer-sign -Wpointer-to-int-cast -Wpragm
as -Wpsabi -Wrestrict -Wreturn-local-addr -Wreturn-type
-Wscalar-storage-order -Wsequence-point -Wshadow -Wshift-count-negative
-Wshift
-count-overflow -Wshift-negative-value -Wshift-overflow=2 -Wno-sign-compare
-Wsizeof-array-argument -Wsizeof-pointer-div -Wsizeof-point
er-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wstringop-overflow=2
-Wstringop-truncation -Wsuggest-attribute=cold -Wno-suggest-at
tribute=const -Wsuggest-attribute=format -Wsuggest-attribute=noreturn
-Wno-suggest-attribute=pure -Wsuggest-final-methods -Wsuggest-fin
al-types -Wswitch -Wswitch-bool -Wswitch-enum -Wswitch-unreachable
-Wsync-nand -Wtautological-compare -Wtrampolines -Wtrigraphs -Wtype-
limits -Wuninitialized -Wunknown-pragmas -Wunused
-Wunused-but-set-parameter -Wunused-but-set-variable
-Wunused-const-variable=2 -Wunus
ed-function -Wunused-label -Wunused-local-typedefs -Wunused-parameter
-Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvari
adic-macros -Wvector-operation-performance -Wvla -Wvolatile-register-var
-Wwrite-strings -fstack-protector-strong -Wdouble-promotion -f
PIC -pthread -DIN_LIBVIRT '-Dabs_top_builddir="/Dati/libvirt/build"'
'-Dabs_top_srcdir="/Dati/libvirt"' -MD -MQ src/util/libvirt_util.a
.p/virhostcpu.c.o -MF src/util/libvirt_util.a.p/virhostcpu.c.o.d -o
src/util/libvirt_util.a.p/virhostcpu.c.o -c ../src/util/virhostcpu.
c
../src/util/virhostcpu.c: In function ‘virHostCPUGetKVMMaxVCPUs’:
../src/util/virhostcpu.c:1212:26: error: ‘KVM_CHECK_EXTENSION’ undeclared
(first use in this function); did you mean ‘G_GNUC_EXTENSION’
?
1212 | if ((ret = ioctl(fd, KVM_CHECK_EXTENSION, KVM_CAP_NR_VCPUS)) >
0)
| ^~~~~~~~~~~~~~~~~~~
| G_GNUC_EXTENSION
../src/util/virhostcpu.c:1212:26: note: each undeclared identifier is
reported only once for each function it appears in
../src/util/virhostcpu.c:1212:47: error: ‘KVM_CAP_NR_VCPUS’ undeclared
(first use in this function)
1212 | if ((ret = ioctl(fd, KVM_CHECK_EXTENSION, KVM_CAP_NR_VCPUS)) >
0)
| ^~~~~~~~~~~~~~~~
[66/1485] Compiling C object src/util/libvirt_util.a.p/virhostmem.c.o
ninja: build stopped: subcommand failed.
On Wed, Aug 30, 2023 at 5:02 PM Mario Marietto <marietto2008(a)gmail.com>
wrote:
So. ok. If I understood correctly : In my system the file kvm.h is
missing. I should install the kernel headers file if I want it. I could do
this if the kernel in use was 6.1,but I'm forced to use 5.4. I can't
install the kernel headers for the kernel 5.4 on top of debian bookworm. Or
at least,at the moment I don't know how to do this. I'm not sure that the
kernel headers for the 5.4 kernel are present between the packages. Or
maybe I can build it from scratch or I can find it somewhere ? Even in this
case, I'm not sure that they will work on a system that has been compiled
on top of a 6.x kernel. I think that I should re-compile libvirt and QEMU
on top of the 5.4 kernel and for this reason I should use an older version
of Debian,maybe 8 or 9. Maybe later,I can upgrade the userland from 8/9 to
12,keeping intact the same kernel. What do you think ? Do you see a shorter
solution ? for sure I don't like to reinstall and recompile everything on
an older version of Linux.
On Wed, Aug 30, 2023 at 11:19 AM Mario Marietto <marietto2008(a)gmail.com>
wrote:
> ok. I've copied this file :
>
> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
>
> to this directory :
>
> /usr/include/linux
>
> the previous error is gone,but it still doesn't work :
>
> # virsh domcapabilities --machine virt --emulatorbin
> /usr/local/bin/qemu-system-arm
> error: failed to get emulator capabilities
> error: KVM is not supported on this platform: Function not implemented
>
>
> this time there isn't any specific error :(
>
> On Wed, Aug 30, 2023 at 11:11 AM Mario Marietto <marietto2008(a)gmail.com>
> wrote:
>
>> Ok. thanks. Yes,I'm obliged to use a kernel minor than 5.7 and I've
>> chosen 5.4. These are the places where I've found the kvm.h file that I
>> need.
>>
>> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/include/sysemu/kvm.h
>> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/asm-arm/kvm.h
>> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
>>
>> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/include/uapi/linux/kvm.h
>>
>>
/home/marietto/Desktop/Dati/200/Si/linux-5.4.244/tools/arch/arm/include/uapi/asm/kvm.h
>>
>> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/uapi/linux/kvm.h
>>
>> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/config/kvm.h
>> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/include/trace/events/kvm.h
>>
>> /home/marietto/Desktop/Dati/200/Si/linux-5.4.244/arch/arm/include/uapi/asm/kvm.h
>>
>>
>> Basically it seems that I can get it from the qemu 5.1 or from the
>> kernel 5.4 source code files. Can you tell me what's the correct one ? You
>> talked about linux-headers,so it might be this :
>>
>> /home/marietto/Desktop/Dati/virt/qemu-v5.1.0/linux-headers/linux/kvm.h
>>
>> ?
>>
>> where should I copy it ? to /usr/include/linux is the right place ?
>>
>> thanks.
>>
>>
>>
>> On Wed, Aug 30, 2023 at 9:46 AM Daniel P. Berrangé <berrange(a)redhat.com>
>> wrote:
>>
>>> On Tue, Aug 29, 2023 at 09:22:35PM +0200, Mario Marietto wrote:
>>> > Hello.
>>> >
>>> > I'm running Debian bookworm on my ARM Chromebook,model
"xe303c12" and
>>> > I've recompiled the kernel (5.4) to enable KVM,so now my system
>>> sounds like
>>> > this :
>>>
>>> That's surely not the default kernel that comes with Debian bookworm,
>>> as that 5.4 version is many years old.
>>>
>>> IIUC the standard bookworm kernel will be 6.4
>>>
>>> > root@chromarietto:~# virsh domcapabilities --machine virt
>>> > --emulatorbin /usr/local/bin/qemu-system-arm
>>> >
>>> > 2023-08-29 10:17:59.110+0000: 1763: error :
>>> virHostCPUGetKVMMaxVCPUs:1228 :
>>> > KVM is not supported on this platform: Function not implemented ;
>>> > error: failed to get emulator capabilities
>>> > error: KVM is not supported on this platform: Function not implemented
>>>
>>> This shows libvirt was built against a kernel that lacks the
>>> kvm.h header file.
>>>
>>> This is expected for armv7 as support for KVM on 32-bit arm was
>>> deleted in the 5.7 kernel. I expect libvirt was built against
>>> the kernel headers from Debian's default 6.4 kernel and thus
>>> lacks KVM support.
>>>
>>> Your booting of the old 5.4 kernel doesn't solve this - you
>>> would actually need to build libvirt (and QEMU) against this
>>> outdated kernel too.
>>>
>>>
>>> With regards,
>>> Daniel
>>> --
>>> |: https://berrange.com -o-
>>> https://www.flickr.com/photos/dberrange :|
>>> |: https://libvirt.org -o-
>>> https://fstop138.berrange.com :|
>>> |: https://entangle-photo.org -o-
>>> https://www.instagram.com/dberrange :|
>>>
>>>
>>
>> --
>> Mario.
>>
>
>
> --
> Mario.
>
--
Mario.
--
Mario.
472
days inactive
481
days old
6 comments
3 participants
participants (3)
-
Daniel P. Berrangé -
Mario Marietto -
Michal Prívozník