Merge pull request #3814 from fidencio/wip/disable-block-device-use-minor-fixes

Minor fixes for the `disable_block_device_use` comments

src/runtime/config/configuration-fc.toml.in

@@ -103,14 +103,6 @@ default_memory = @DEFMEMSZ@
 # Default 0
 #memory_offset = 0
 
-# Disable block device from being used for a container's rootfs.
-# In case of a storage driver like devicemapper where a container's
-# root file system is backed by a block device, the block device is passed
-# directly to the hypervisor for performance reasons.
-# This flag prevents the block device from being passed to the hypervisor,
-# 9pfs is used instead to pass the rootfs.
-disable_block_device_use = @DEFDISABLEBLOCK@
-
 # Block storage driver to be used for the hypervisor in case the container
 # rootfs is backed by a block device. This is virtio-scsi, virtio-blk
 # or nvdimm.

src/runtime/config/configuration-qemu.toml.in

@@ -143,7 +143,7 @@ default_memory = @DEFMEMSZ@
 # root file system is backed by a block device, the block device is passed
 # directly to the hypervisor for performance reasons.
 # This flag prevents the block device from being passed to the hypervisor,
-# 9pfs is used instead to pass the rootfs.
+# virtio-fs is used instead to pass the rootfs.
 disable_block_device_use = @DEFDISABLEBLOCK@
 
 # Shared file system type:

src/runtime/pkg/katautils/config.go

@@ -568,7 +568,7 @@ func newFirecrackerHypervisorConfig(h hypervisor) (vc.HypervisorConfig, error) {
 		EntropySource:         h.GetEntropySource(),
 		EntropySourceList:     h.EntropySourceList,
 		DefaultBridges:        h.defaultBridges(),
-		DisableBlockDeviceUse: h.DisableBlockDeviceUse,
+		DisableBlockDeviceUse: false, // shared fs is not supported in Firecracker,
 		HugePages:             h.HugePages,
 		Debug:                 h.Debug,
 		DisableNestingChecks:  h.DisableNestingChecks,