On 1/30/21 7:54 PM, Peter Maydell wrote: > On Sat, 30 Jan 2021 at 18:36, Philippe Mathieu-Daudé <f4bug@xxxxxxxxx> wrote: >> >> Hi Peter, >> >> On 1/30/21 4:37 PM, Peter Maydell wrote: >>> On Sat, 30 Jan 2021 at 01:52, Philippe Mathieu-Daudé <f4bug@xxxxxxxxx> wrote: >>>> >>>> KVM requires a cpu based on (at least) the ARMv7 architecture. >>> >>> These days it requires ARMv8, because we dropped 32-bit host >>> support, and all 64-bit host CPUs are v8. >> >> Oh, this comment is about the target, to justify it is pointless to >> include pre-v7 target cpus/machines in a KVM-only binary. >> >> I'll update as: >> >> "KVM requires the target cpu based on (at least) the ARMv7 >> architecture." > > KVM requires the target CPU to be at least ARMv8, because > we only support the "host" cpu type, and all KVM host CPUs > are v8, which means you can't pass a v7 CPU as the target CPU. > (This used to not be true when we still supported running > KVM on a v7 CPU like the Cortex-A15, in which case you could > pass it to the guest.) Indeed: $ qemu-system-aarch64 -M xilinx-zynq-a9 qemu-system-aarch64: KVM is not supported for this guest CPU type qemu-system-aarch64: kvm_init_vcpu: kvm_arch_init_vcpu failed (0): Invalid argument
