It only needs access to a small number of resources. Unfortunately, it needs access to /dev/vfio right now. This should be fixed by using file descriptor passing instead. Furthermore, Cloud Hypervisor needs to be able to lock memory. Running in a user namespace prevents it from having CAP_IPC_LOCK. Therefore, it is necessary to increase RLIMIT_MLOCK before running Cloud Hypervisor. Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com> --- .../image/etc/udev/rules.d/99-spectrum.rules | 3 ++ host/rootfs/image/usr/bin/run-vmm | 33 +++++++++++++++++++++- 2 files changed, 35 insertions(+), 1 deletion(-) diff --git a/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules b/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules index 337bbe47dbbc6f3828722d8244f2689a39f3090f..de0f682aa40f8481dc3c25a90c695e2326536316 100644 --- a/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules +++ b/host/rootfs/image/etc/udev/rules.d/99-spectrum.rules @@ -3,3 +3,6 @@ # systemd-udevd unsets PATH, so fix that. ACTION!="remove", ENV{PCI_CLASS}=="2????", RUN+="/usr/bin/env PATH=/usr/bin /usr/libexec/net-add" + +# make /dev/kvm world-accessible +KERNEL=="kvm", MODE="0666" diff --git a/host/rootfs/image/usr/bin/run-vmm b/host/rootfs/image/usr/bin/run-vmm index ba8b59c2677408acdd01c2eda3cf2dd60992d881..24c3d607bfcf6fea6196b61d2941141486d33fd6 100755 --- a/host/rootfs/image/usr/bin/run-vmm +++ b/host/rootfs/image/usr/bin/run-vmm @@ -52,5 +52,36 @@ unexport ! fdmove -c 3 0 redirfd -r 0 /dev/null +s6-softlimit -H -l 18446744073709551615 if { udevadm wait /dev/kvm } -cloud-hypervisor --api-socket fd=3 +bwrap + --unshare-all + --unshare-user + --dev /dev + --dev-bind /dev/kvm /dev/kvm + --dev-bind /dev/vfio /dev/vfio + --tmpfs /dev/shm + --tmpfs /tmp + --tmpfs /var/tmp + --ro-bind /etc /etc + --ro-bind /lib /lib + --ro-bind /nix /nix + --ro-bind /usr /usr + --ro-bind /sys /sys + --bind /run /run + --proc /proc + --ro-bind /proc/sys /proc/sys + --tmpfs /proc/scsi + --remount-ro /proc/scsi + --tmpfs /proc/acpi + --remount-ro /proc/acpi + --tmpfs /proc/fs + --remount-ro /proc/fs + --tmpfs /proc/irq + --remount-ro /proc/irq + --ro-bind /dev/null /proc/timer_list + --ro-bind /dev/null /proc/kcore + --ro-bind /dev/null /proc/kallsyms + --ro-bind /dev/null /proc/sysrq-trigger + -- + cloud-hypervisor --api-socket fd=3 -- 2.52.0