I'm trying to run debvm armhf images on an arm64 host with KVM acceleration. Currently the logic behind activating KVM seems incorrect, and we'd need to use ``qemu-system-aarch64 -cpu host,aarch64=off`` instead of ``qemu-system-arm`` (https://wiki.debian.org/Arm64Qemu). Here's a crude proof-of-concept that enables KVM acceleration in that configuration: ``` --- /usr/bin/debvm-run.dist 2025-06-26 19:04:56.000000000 +0200 +++ /usr/bin/debvm-run 2025-10-15 13:27:44.506494970 +0200 @@ -380,6 +380,7 @@ MACHINE="type=q35" ;; arm) + QEMU=qemu-system-aarch64 CPU=max MACHINE="type=virt,highmem=off" MAX_SMP=8 @@ -435,7 +436,7 @@ "$@" fi -ENABLE_KVM=no +ENABLE_KVM=yes if test "$ARCHITECTURE" = "$KERNELARCH"; then ENABLE_KVM=yes case "$VMARCH:$KERNELARCH" in @@ -456,7 +457,7 @@ # While kvm will fall back gracefully, only override CPU when we expect # kvm to work. if test -w /dev/kvm; then - CPU=max + CPU=host,aarch64=off # kvm: "max" will become "host", intended. # tcg: "max" will actually work, "host" would not. fi ``` I am not sure if that's something debvm-run wants to support, and I have trouble understanding the ``test "$ARCHITECTURE" = "$KERNELARCH"`` bit which evaluates to ``test arm64 = arm`` here; otherwise I'm available to propose a mergeable patch :)