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.
