stubdom questions

["Zhai, Edwin" <edwin.zhai@intel.com>]

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samuel,
I have a try with HVM stubdomain on r17062, but failed to make on 32b platform.
Attached patch can fix it, but don't know if okay.

After installation, I failed to start stubdom. So I created it manually and got 
following debug mesg(both HVMdomain and stubdom are created)

Can you give some lights on following questions:
1. I use default vnclisten. Does it matter?
2. Seems qemu in stubdom has some issue and couldn't update the 'vnc-port' in 
xenstore. Or the stubdom didn't run at all. How can I debug it?
3. "Create /etc/xen/stubdom-hvmconfig" in readme -- seems "hvmconfig" should 
match the domain name rather than config file.

Thanks,


=================== running error =============================
# xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  1813     2     r-----   2489.0
EdwinHVMDomainVtd2                          44   128     1     ------      0.0
stubdom-EdwinHVMDomainVtd2                  45    32     1     -b----      0.0


[root@vt-gang32 ~]# /usr/lib/xen/bin/stubdom-dm -d 44 -domain-name EdwinHVMDomai
nVtd2 -m 128 -vnc 127.0.0.1:0 -vncunused -monitor vc -vcpus 1 -boot c -serial pt
y -acpi -M xenfv
xenstore-read: couldn't read path /local/domain/44/console/vnc-port
Using config file "./stubdom-EdwinHVMDomainVtd2".
Started domain stubdom-EdwinHVMDomainVtd2
xenstore-read: couldn't read path /local/domain/44/console/vnc-port
Failed to read /local/domain/0/backend/vbd/45/768/feature-flush-cache.
16777216 sectors of 512 bytes
**************************
blk_open(/local/domain/45/device/vbd/768) -> 5
xs_read(/local/domain/45/device/vbd/5632/phantom_vbd): ENOENT
xs_watch(/local/domain/0/backend/vbd/45/5632/params, hdc)
******************* BLKFRONT for /local/domain/45/device/vbd/5632 **********


backend at /local/domain/0/backend/vbd/45/5632
xenstore-read: couldn't read path /local/domain/44/console/vnc-port
xenstore-read: couldn't read path /local/domain/44/console/vnc-port
xenstore-read: couldn't read path /local/domain/44/console/vnc-port

====================================================================

================== compile error ===================================
make[2]: Entering directory 
`/home/another/gzhai/srcs/hg/xen-dev/hv/extras/mini-os/arch/x86'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory 
`/home/another/gzhai/srcs/hg/xen-dev/hv/extras/mini-os/arch/x86'
i686-xen-elf-ld -r  -m elf_i386 arch/x86/x86_32.o blkfront.o events.o fs-front.o 
gnttab.o hypervisor.o kernel.o main.o mm.o netfront.o sched.o lib/ctype.o 
lib/math.o lib/printf.o lib/string.o lib/sys.o lib/xmalloc.o lib/xs.o 
xenbus/xenbus.o console/console.o console/xencons_ring.o lwip.a 
/home/another/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/i386-dm-stubdom/qemu.a 
/home/another/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/i386-dm-stubdom/libqemu.a 
-Larch/x86 -lx86_32  -L../../stubdom/libxc -lxenctrl -lxenguest -lpci -lz -lc -o 
mini-os.o
i686-xen-elf-objcopy -w -G xenos_* -G _start mini-os.o mini-os.o
i686-xen-elf-ld  -m elf_i386 -T arch/x86/minios-x86_32.lds mini-os.o  -o mini-os
mini-os.o: In function `bdrv_snapshot_dump':
/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block.c:1042: undefined reference 
to `__moddi3'
/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block.c:1042: undefined reference 
to `__moddi3'
mini-os.o: In function `vmdk_is_allocated':
/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block-vmdk.c:547: undefined 
reference to `__moddi3'
mini-os.o: In function `vmdk_read':
/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block-vmdk.c:563: undefined 
reference to `__moddi3'
mini-os.o: In function `cloop_read':
/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block-cloop.c:143: undefined 
reference to `__moddi3'
mini-os.o:/home/gzhai/srcs/hg/xen-dev/hv/stubdom/ioemu/block-bochs.c:182: more 
undefined references to `__moddi3' follow
make[1]: *** [mini-os] Error 1
make[1]: Leaving directory 
`/home/another/gzhai/srcs/hg/xen-dev/hv/extras/mini-os'
make: *** [qemu-stubdom] Error 2
===================================================================


-- 
best rgds,
edwin

[-- Attachment #2: stubdom_fix.patch --]
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diff -r bdc4d718bef7 extras/mini-os/lib/math.c
--- a/extras/mini-os/lib/math.c	Tue Feb 19 16:19:51 2008 +0800
+++ b/extras/mini-os/lib/math.c	Tue Feb 19 17:00:34 2008 +0800
@@ -388,6 +388,23 @@ __umoddi3(u_quad_t a, u_quad_t b)
         return (r);
 }
 
+/*
+ * Remainder of signed quad division.
+ * Truncates towards zero, as required by C99:
+ *  11 %  5 =  1
+ * -11 %  5 = -1
+ *  11 % -5 =  1
+ * -11 % -5 =  1
+ */
+s64 __moddi3(s64 a, s64 b)
+{
+    u64 ua, ub, urem;
+    int neg = (a < 0);
+    ua = neg ? -(u64)a : a;
+    ub = (b < 0) ? -(u64)b : b;
+    __qdivrem(ua, ub, &urem);
+    return (neg ? -urem : urem);
+}
 #endif /* !defined(__ia64__) */
 
 #ifndef HAVE_LIBC

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# Python configuration setup for 'xm create'.
# This script sets the parameters used when a domain is created using 'xm create'.
# You use a separate script for each domain you want to create, or 
# you can set the parameters for the domain on the xm command line.
#============================================================================

import os, re
arch = os.uname()[4]
if re.search('64', arch):
    arch_libdir = 'lib64'
else:
    arch_libdir = 'lib'

#----------------------------------------------------------------------------
# Kernel image file.
kernel = "/usr/lib/xen/boot/hvmloader"

# The domain build function. HVM domain uses 'hvm'.
builder='hvm'

# Initial memory allocation (in megabytes) for the new domain.
#
# WARNING: Creating a domain with insufficient memory may cause out of
#          memory errors. The domain needs enough memory to boot kernel
#          and modules. Allocating less than 32MBs is not recommended.
memory = 128

# Shadow pagetable memory for the domain, in MB.
# If not explicictly set, xend will pick an appropriate value.  
# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
# shadow_memory = 8

# A name for your domain. All domains must have different names.
name = "EdwinHVMDomainVtd2"

# 128-bit UUID for the domain.  The default behavior is to generate a new UUID
# on each call to 'xm create'.
#uuid = "06ed00fe-1162-4fc4-b5d8-11993ee4a8b9"

#-----------------------------------------------------------------------------
# The number of cpus guest platform has, default=1
#vcpus=2

# Enable/disable HVM guest PAE, default=1 (enabled)
pae=1

# Enable/disable HVM guest ACPI, default=1 (enabled)
acpi=1

# Enable/disable HVM APIC mode, default=1 (enabled)
# Note that this option is ignored if vcpus > 1
apic=1

# List of which CPUS this domain is allowed to use, default Xen picks
#cpus = ""         # leave to Xen to pick
#cpus = "0"        # all vcpus run on CPU0
#cpus = "0-3,5,^1" # run on cpus 0,2,3,5

# Optionally define mac and/or bridge for the network interfaces.
# Random MACs are assigned if not given.
#vif = [ 'type=ioemu, mac=00:16:3e:00:00:88, bridge=xenbr0' ]

#----------------------------------------------------------------------------
# Define the disk devices you want the domain to have access to, and
# what you want them accessible as.
# Each disk entry is of the form phy:UNAME,DEV,MODE
# where UNAME is the device, DEV is the device name the domain will see,
# and MODE is r for read-only, w for read-write.

#disk = [ 'file:/var/img/rhel5-ins.img,hda,w', ',hdc:cdrom,r' ]
#disk = [ 'file:/var/img/qcow/rhel4u2_ia32.img.vtd-lm.qcow,hda,w', ',hdc:cdrom,r' ]

#----------------------------------------------------------------------------
# Configure the behaviour when a domain exits.  There are three 'reasons'
# for a domain to stop: poweroff, reboot, and crash.  For each of these you
# may specify:
#
#   "destroy",        meaning that the domain is cleaned up as normal;
#   "restart",        meaning that a new domain is started in place of the old
#                     one;
#   "preserve",       meaning that no clean-up is done until the domain is
#                     manually destroyed (using xm destroy, for example); or
#   "rename-restart", meaning that the old domain is not cleaned up, but is
#                     renamed and a new domain started in its place.
#
# The default is
#
#   on_poweroff = 'destroy'
#   on_reboot   = 'restart'
#   on_crash    = 'restart'
#
# For backwards compatibility we also support the deprecated option restart
#
# restart = 'onreboot' means on_poweroff = 'destroy'
#                            on_reboot   = 'restart'
#                            on_crash    = 'destroy'
#
# restart = 'always'   means on_poweroff = 'restart'
#                            on_reboot   = 'restart'
#                            on_crash    = 'restart'
#
# restart = 'never'    means on_poweroff = 'destroy'
#                            on_reboot   = 'destroy'
#                            on_crash    = 'destroy'

#on_poweroff = 'destroy'
#on_reboot   = 'restart'
#on_crash    = 'restart'

#============================================================================

# New stuff
#device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
device_model = '/boot/edwin/qemu-dm.debug'
#device_model = '/usr/lib/xen/bin/stubdom-dm'

#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c), Network (n) or CD-ROM (d) 
# default: hard disk, cd-rom, floppy
#boot="cda"

#-----------------------------------------------------------------------------
#  write to temporary files instead of disk image files
#snapshot=1

#----------------------------------------------------------------------------
# enable SDL library for graphics, default = 0
sdl=0

#----------------------------------------------------------------------------
# enable VNC library for graphics, default = 1
vnc=1

#----------------------------------------------------------------------------
# address that should be listened on for the VNC server if vnc is set.
# default is to use 'vnc-listen' setting from /etc/xen/xend-config.sxp
#vnclisten="localhost"

#----------------------------------------------------------------------------
# set VNC display number, default = domid
#vncdisplay=1

#----------------------------------------------------------------------------
# try to find an unused port for the VNC server, default = 1
#vncunused=1

#----------------------------------------------------------------------------
# enable spawning vncviewer for domain's console
# (only valid when vnc=1), default = 0
#vncconsole=1

#----------------------------------------------------------------------------
# set password for domain's VNC console
# default is depents on vncpasswd in xend-config.sxp
vncpasswd=''

#----------------------------------------------------------------------------
# no graphics, use serial port
#nographic=0

#----------------------------------------------------------------------------
# enable stdvga, default = 0 (use cirrus logic device model)
stdvga=0

#-----------------------------------------------------------------------------
#   serial port re-direct to pty deivce, /dev/pts/n 
#   then xm console or minicom can connect
serial='pty'


#-----------------------------------------------------------------------------
#   Qemu Monitor, default is disable
#   Use ctrl-alt-2 to connect
monitor=1


#-----------------------------------------------------------------------------
#   enable sound card support, [sb16|es1370|all|..,..], default none
#soundhw='sb16'


#-----------------------------------------------------------------------------
#    set the real time clock to local time [default=0 i.e. set to utc]
#localtime=1


#-----------------------------------------------------------------------------
#    set the real time clock offset in seconds [default=0 i.e. same as dom0]
#rtc_timeoffset=3600

#-----------------------------------------------------------------------------
#    start in full screen
#full-screen=1   


#-----------------------------------------------------------------------------
#   Enable USB support (specific devices specified at runtime through the
#			monitor window)
#usb=1

#   Enable USB mouse support (only enable one of the following, `mouse' for
#			      PS/2 protocol relative mouse, `tablet' for
#			      absolute mouse)
#usbdevice='mouse'
#usbdevice='tablet'

#-----------------------------------------------------------------------------
#   Set keyboard layout, default is en-us keyboard. 
#keymap='ja'

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kernel = "/usr/lib/xen/boot/stubdom.gz"


#vif = [ 'ip=10.239.36.188,', 'type=ioemu,  mac=00:16:3e:00:00:88, bridge=xenbr0' ]
vif = [ 'type=ioemu,  mac=00:16:3e:00:00:88, bridge=xenbr0' ]


disk = [ 'file:/var/img/rhel5-ins.img,hda,w', ',hdc:cdrom,r' ]
#disk = [ 'file:/var/img/qcow/rhel5-ins.img.qcow,hda,w', ',hdc:cdrom,r' ]

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