Hi Peter, When arm virt machine is run in accelerated mode with "-cpu host -machine virt", the default gic version is 2.
I understand the rationale with TCG where we don't have MSI ITS emulation along with GICv3 so we need to choose GICv2 to get GICv2M functionality. However in KVM mode, I would have expected to see the host GIC probed to set the same version on guest. Indeed most of our HW now have GICv3 without GICv2 compat mode so our default values lead to weird traces: " qemu-system-aarch64: PMU: KVM_SET_DEVICE_ATTR: Invalid argument qemu-system-aarch64: failed to set irq for PMU " I would like to propose a patch to improve those errors and also suggest a hint. But I also wanted to know whether you would accept to change the default value with KVM and choose the host version instead of 2. For TCG we would keep v2. Thanks Eric
