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 <marietto2...@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 <marietto2...@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 <berra...@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.