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Re: [Minios-devel] [Unikraft] Support for KVM on ARM
Hay Ajay,
you can actually do both - natively compile on ARM or doing a cross
compilation. Unikraft's main makefile is able to detect this. This
happens transparently. You can only influence it by setting the
CROSS_COMPILE environment variable before calling make. You should need
to remove the -mtune=cortex-a7 and -mcpu=cortex-a7 flags from
unikraft/unikraft/arch/arm/Makefile.uk.
In fact, your GCC version might be too old. Unfortunately Unikraft is
not warning you yet but ARM published a patch series that is going to
warn you in the future.
On ARM, I just tested the native compile with
gcc (Debian 6.3.0-18) 6.3.0 20170516
I use the same for the cross compilation from x86:
arm-linux-gnueabihf-gcc (Debian 6.3.0-18) 6.3.0 20170516
For debugging, you can have a look what is getting called with the
verbose option:
make V=1
Thanks,
Simon
On 30.04.2018 10:27, Ajay Garg wrote:
https://github.com/nim-lang/Nim/issues/2620 suggests it might be due to
(old) gcc version.
Any chance we can get the following via cross-compilation :
* arm-options in menuconfig screen?
* actually cross-compile for arm32 in unikraft ecosystem?
On Mon, Apr 30, 2018 at 12:25 PM, Ajay Garg <ajaygargnsit@xxxxxxxxx
<mailto:ajaygargnsit@xxxxxxxxx>> wrote:
Hi Simon.
Right now, you can test Unikraft with Xen on arm32. Be aware
that there is a open bug on the memory allocator for arm
(see:https://wiki.xenproject.org/wiki/Category:Unikraft_Users
<https://wiki.xenproject.org/wiki/Category:Unikraft_Users>).
arm64 with Xen is currently not supported but we working on it.
Same for KVM and baremetal.
We use cubieboard2/3 for arm32 tests. These boards are even
officially supported by Debian and can run Xen.
So we bought a cubieboard2 :)
Brought the board up without xen.
Then brought the board up with xen.
At this point, "sudo xl list" lists "Domain-0" fine.
Now, we are wanting to run the helloworld-unikraft-unikernel.
To keep aside any cross-compilation issues, we are compiling on
cubieboard2 itself.
Following is the .config file (majorly containing the "ukdebug" and
"ukboot" changes required for arm32) :
#################################################################################
#
# Automatically generated file; DO NOT EDIT.
# Unikraft/0.2~8b94640 Configuration
#
#
# Architecture Selection
#
# ARCH_X86_64 is not set
ARCH_ARM_32=y
# MARCH_CORTEXA7 is not set
MARCH_A20NEON=y
#
# Platform Support
#
PLAT_XEN=y
XEN_DBGEMERGENCY=y
PLAT_LINUXU=y
LINUXU_DEFAULT_HEAPMB=4
#
# Library Configuration
#
HAVE_BOOTENTRY=y
# HAVE_LIBC is not set
# HAVE_SCHED is not set
LIBUKBOOT=y
LIBUKBOOT_BANNER=y
LIBUKBOOT_MAXNBARGS=60
# LIBUKBOOT_INITALLOC is not set
LIBUKDEBUG=y
LIBUKDEBUG_PRINTK=y
LIBUKDEBUG_PRINTD=y
# LIBUKDEBUG_PRINTD_EXTRA is not set
# LIBUKDEBUG_PRINTD_INFO is not set
# LIBUKDEBUG_PRINTD_WARN is not set
LIBUKDEBUG_PRINTD_ERR=y
# LIBUKDEBUG_PRINTD_CRIT is not set
# LIBUKDEBUG_NOREDIR is not set
# LIBUKDEBUG_REDIR_PRINTD is not set
LIBUKDEBUG_REDIR_PRINTK=y
LIBUKDEBUG_ENABLE_ASSERT=y
LIBUKARGPARSE=y
LIBNOLIBC=y
LIBUKALLOC=y
# LIBUKALLOC_IFPAGES is not set
# LIBUKALLOC_IFSTATS is not set
# LIBUKALLOCBBUDDY is not set
# LIBUKSCHED is not set
# LIBUKSCHEDCOOP is not set
LIBFDT=y
#
# Build Options
#
# OPTIMIZE_NONE is not set
OPTIMIZE_PERF=y
# OPTIMIZE_SIZE is not set
# OPTIMIZE_DEADELIM is not set
# DEBUG_SYMBOLS is not set
OPTIMIZE_STRIP=y
# RECORD_BUILDTIME is not set
CROSS_COMPILE=""
#
# Application Options
#
APPHELLOWORLD_DEPENDENCIES=y
APPHELLOWORLD_PRINTARGS=y
UK_NAME="helloworld"
#################################################################################
However, upon compilation, following is observed :
#################################################################################
debian@debian-armhf:~/unikraft/apps/helloworld$ make
make[1]: Entering directory '/home/debian/unikraft/unikraft'
CP config
CC libxenplat: hypervisor.o
cc1: error: bad value (cortex-a7) for -mcpu switch
cc1: error: bad value (cortex-a7) for -mtune switch
/home/debian/unikraft/unikraft/support/build/Makefile.build:48:
recipe for target
'/home/debian/unikraft/apps/helloworld/build/libxenplat/hypervisor.o' failed
make[1]: ***
[/home/debian/unikraft/apps/helloworld/build/libxenplat/hypervisor.o] Error
1
make[1]: Leaving directory '/home/debian/unikraft/unikraft'
Makefile:6: recipe for target 'all' failed
make: *** [all] Error 2
debian@debian-armhf:~/unikraft/apps/helloworld$
#################################################################################
So, we proceed to remove the -mtune=cortex-a7 and -mcpu=cortex-a7
flags from unikraft/unikraft/arch/arm/Makefile.uk.
Thereafter, upon recompiling, we get
#################################################################################
debian@debian-armhf:~/unikraft/apps/helloworld$ make
make[1]: Entering directory '/home/debian/unikraft/unikraft'
CP config
CC libxenplat: hypervisor.o
In file included from
/home/debian/unikraft/unikraft/plat/xen/hypervisor.c:43:0:
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h: In function
‘ukarch_test_and_clr_bit’:
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:90:2:
warning: implicit declaration of function ‘__atomic_fetch_and’
[-Wimplicit-function-declaration]
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:90:40:
error: ‘__ATOMIC_RELAXED’ undeclared (first use in this function)
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:90:40: note:
each undeclared identifier is reported only once for each function
it appears in
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h: In function
‘ukarch_test_and_set_bit’:
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:105:2:
warning: implicit declaration of function ‘__atomic_fetch_or’
[-Wimplicit-function-declaration]
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:105:38:
error: ‘__ATOMIC_RELAXED’ undeclared (first use in this function)
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h: In function
‘ukarch_test_and_clr_bit_sync’:
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:148:40:
error: ‘__ATOMIC_SEQ_CST’ undeclared (first use in this function)
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h: In function
‘ukarch_test_and_set_bit_sync’:
/home/debian/unikraft/unikraft/include/uk/arch/atomic.h:161:38:
error: ‘__ATOMIC_SEQ_CST’ undeclared (first use in this function)
/home/debian/unikraft/unikraft/plat/xen/hypervisor.c: In function
‘do_hypervisor_callback’:
/home/debian/unikraft/unikraft/plat/xen/hypervisor.c:71:2: warning:
implicit declaration of function ‘__atomic_exchange_n’
[-Wimplicit-function-declaration]
/home/debian/unikraft/unikraft/plat/xen/hypervisor.c:71:7: error:
‘__ATOMIC_SEQ_CST’ undeclared (first use in this function)
/home/debian/unikraft/unikraft/support/build/Makefile.build:48:
recipe for target
'/home/debian/unikraft/apps/helloworld/build/libxenplat/hypervisor.o' failed
make[1]: ***
[/home/debian/unikraft/apps/helloworld/build/libxenplat/hypervisor.o] Error
1
make[1]: Leaving directory '/home/debian/unikraft/unikraft'
Makefile:6: recipe for target 'all' failed
make: *** [all] Error 2
#################################################################################
What are we missing?
Thanks and Regards,
Ajay
Thanks and Regards,
Ajay
Thanks,
Simon
--
Regards,
Ajay
--
Regards,
Ajay
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