dm：hugepage file lock bug

[476997779]

We use the Ubuntu power-on auto-start script to execute two launch_vm.sh scripts to bringup two guest VMs.

Sometimes the guest bringup fails and the error is as follows：

18.440990] acrn_dm: mkdir /run/hugepage failed. [ 18.441002] acrn_dm: vm_create: VM2 [ 18.441005] acrn_dm: vm_create: VM1 [ 18.452230] acrn_dm: vm setup asyncio page [ 18.452249] acrn_dm: vm_setup_memory: size=0x500000000 [ 18.452264] acrn_dm: lock acrn hugetlb failed with errno: 9 [ 18.452907] acrn_dm: ACRN_IOCTL_SET_MEMSEG ioctl() returned an error: Bad address [ 18.452924] acrn_dm: Unable to setup memory (14) [ 18.462165] acrn_dm: vm setup asyncio page [ 18.462188] acrn_dm: vm_setup_memory: size=0x800000000 [ 23.093691] acrn_dm: vm_init_vdevs

I think this is a software bug. When multiple VMs create the/run/hugepagedirectory at the same time, there is no locking mechanism.

init_hugetlb should return a Boolean value and cannot return -1.

[476997779]

18.440990] acrn_dm: mkdir /run/hugepage failed.
[ 18.441002] acrn_dm: vm_create: VM2
[ 18.441005] acrn_dm: vm_create: VM1
[ 18.452230] acrn_dm: vm setup asyncio page
[ 18.452249] acrn_dm: vm_setup_memory: size=0x500000000
[ 18.452264] acrn_dm: lock acrn hugetlb failed with errno: 9
[ 18.452907] acrn_dm: ACRN_IOCTL_SET_MEMSEG ioctl() returned an error: Bad address
[ 18.452924] acrn_dm: Unable to setup memory (14)
[ 18.462165] acrn_dm: vm setup asyncio page
[ 18.462188] acrn_dm: vm_setup_memory: size=0x800000000