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.