Hi Marc, I noticed that in recent kernels (4.19 in our case), KVM no longer works for 32-bit processes running on arm64 machines. We (Crostini/crosvm, Linux VM support on Chromebooks) use this KVM_COMPAT on all arm64-based Chromebooks that support VMs, since our entire userspace (including crosvm) is 32-bit. I found this commit (KVM: arm64: Prevent KVM_COMPAT from being selected): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=37b65db85f9b2fc98267eee4a18d7506492e6e8c Is there any particular reason the compat ioctl is disabled (e.g. actual bugs/breakage), or would it be possible to re-enable KVM_COMPAT for ARM64? In my brief testing with a 4.19-stable-based kernel on a new arm64 board, everything seems to work fine with the commit above reverted. Thanks, -- Daniel _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
