[Qemu-discuss] Cannot boot with the "enable-kvm" option, on OMAP5432-uevm board

[DEGRAIX Maxime]

Hello,

I am currently trying to use virtualization on my Omap5432-uevm board (Armv7, Cortex a15). I am using Qemu 2.3.

I have a working linux 4.0 system with a Debian Jessie root file system on that board. I succeed to emulate a Versatile Express board, with a Cortex a15, from my Omap5 and make a system work on it. Nonetheless it does not work when I try to virtualize it via the “-enable-kvm” option, using the same kernel and the same root file system.

My command to launch Qemu:

qemu-system-arm –enable-kvm -machine vexpress-a15 -cpu cortex-a15 -m 1600M –smp 2 \

-kernel zImage \

-append "console=ttyAMA0 earlyprintk=serial root=/dev/mmcblk0 rw rootfstype=ext4" \

-serial stdio -dtb vexpress-v2p-ca15-tc1.dtb \

-drive if=sd,cache=writeback,file=rootfs_guest_omap.img,format=raw  

 

(It works without the –enable-kvm option, but I want it to be virtualized)

 

My boot logs :

---------------------------
Warning: Number of SMP cpus requested (2) exceeds the recommended cpus supported by KVM (1)

Warning: Number of hotpluggable cpus requested (2) exceeds the recommended cpus supported by KVM (1)

Uncompressing Linux... done, booting the kernel.

[    0.000000] Booting Linux on physical CPU 0x0

[    0.000000] Initializing cgroup subsys cpuset

[    0.000000] Linux version 4.0.0 (address@hidden) (gcc version 4.9.3 20141031 (prerelease) (Linaro GCC 2014.11) ) #20 SMP Fri May 29 12:42:32 UTC 2015

[    0.000000] CPU: ARMv7 Processor [412fc0f2] revision 2 (ARMv7), cr=30c5387d

[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache

[    0.000000] Machine model: V2P-CA15

[    0.000000] bootconsole [earlycon0] enabled

[    0.000000] Forcing write-allocate cache policy for SMP

[    0.000000] Memory policy: Data cache writealloc

[    0.000000] PERCPU: Embedded 10 pages/cpu @e3354000 s11776 r8192 d20992 u40960

[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 406400

[    0.000000] Kernel command line: console=ttyAMA0 earlyprintk=serial root=/dev/mmcblk0 rw rootfstype=ext4

[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)

[    0.000000] Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes)

[    0.000000] Inode-cache hash table entries: 131072 (order: 7, 524288 bytes)

[    0.000000] Memory: 1616636K/1638400K available (5129K kernel code, 173K rwdata, 1432K rodata, 268K init, 173K bss, 21764K reserved, 0K cma-reserved, 0K highmem)

[    0.000000] Virtual kernel memory layout:

[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)

[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)

[    0.000000]     vmalloc : 0xe4800000 - 0xff000000   ( 424 MB)

[    0.000000]     lowmem  : 0x80000000 - 0xe4000000   (1600 MB)

[    0.000000]     pkmap   : 0x7fe00000 - 0x80000000   (   2 MB)

[    0.000000]     modules : 0x7f000000 - 0x7fe00000   (  14 MB)

[    0.000000]       .text : 0x80008000 - 0x80670894   (6563 kB)

[    0.000000]       .init : 0x80671000 - 0x806b4000   ( 268 kB)

[    0.000000]       .data : 0x806b4000 - 0x806df500   ( 174 kB)

[    0.000000]        .bss : 0x806df500 - 0x8070a9ac   ( 174 kB)

[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1

[    0.000000] Hierarchical RCU implementation.

[    0.000000]  RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2.

[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2

[    0.000000] NR_IRQS:16 nr_irqs:16 16

[    0.000000] L2C: failed to init: -19

[    0.000000] Architected cp15 timer(s) running at 6.14MHz (virt).

[    0.000006] sched_clock: 56 bits at 6MHz, resolution 162ns, wraps every 2796202663936ns

[    0.017208] Switching to timer-based delay loop, resolution 162ns

[    0.031044] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956969942ns

[    0.048556] Console: colour dummy device 80x30

[    0.059528] Calibrating delay loop (skipped), value calculated using timer frequency.. 12.28 BogoMIPS (lpj=61440)

[    0.081643] pid_max: default: 32768 minimum: 301

[    0.091639] Mount-cache hash table entries: 4096 (order: 2, 16384 bytes)

[    0.106705] Mountpoint-cache hash table entries: 4096 (order: 2, 16384 bytes)

[    0.122569] CPU: Testing write buffer coherency: ok

[    0.135601] /cpus/address@hidden missing clock-frequency property

[    0.147750] /cpus/address@hidden missing clock-frequency property

[    0.159353] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000

[    0.171767] Setting up static identity map for 0x804e5138 - 0x804e5190

[    0.211109] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001

[    0.211444] Brought up 2 CPUs

[    0.234908] SMP: Total of 2 processors activated (24.57 BogoMIPS).

[    0.247770] CPU: All CPU(s) started in SVC mode.

[    0.286713] devtmpfs: initialized

[    0.306634] VFP support v0.3: implementor 41 architecture 4 part 30 variant f rev 0

[    0.345263] NET: Registered protocol family 16

[    0.364706] DMA: preallocated 256 KiB pool for atomic coherent allocations

---------------------------

 

The boot stops there, nothing else happen.

 

If I remove the “-smp 2” option to get ride of warnings the boot stops at this step :

[    0.171767] Setting up static identity map for 0x804e5138 - 0x804e5190

 

 

I tried to make several modifications to my kernel, in vain. Do you know if something is missing in my command line or if a specific configuration may be missing ?

Thanks for your help.

Regards.

Maxime Degraix.