Re: [Xen-devel] Custom Guest OS not booting

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> I didn't check which hcall you're making, but i'm betting its the one
> to do consoleio. By default, only dom0 is allowed to do such. You're
> options are either to do the work to get domU io working (non-
> trivial), or hack xen to allow anybody to write to consoleio. Look in
> xen/drivers/char/console.c line 349:
>
>      /* Only domain 0 may access the emergency console. */
>      if ( current->domain->domain_id != 0 )
>          return -EPERM;

I thought you could build Xen with debug=y to make the console hypercall work 
for other doms...

Could be wrong now but worth a try.

Cheers,
Mark

> Good luck
> sRp
>
> On Oct 2, 2005, at 1:14 PM, ivan wrote:
> > Hi,
> > Im trying to get a grip on developing with xen and I'm trying to
> > create my own
> > guest os. The OS is very simple, it prints out a message and then
> > exits.
> > Source listing below.
> > When I try to boot this image with xm create -c hello (hello just
> > points
> > kernel to ivanos) one of two things happen.
> >
> > 1)
> > It prints:
> > Using config file "hello".
> > Started domain IvanOS, console on port 9627
> > ************ REMOTE CONSOLE: CTRL-] TO QUIT ********
> >
> > I press return twice and it prints
> > ************ REMOTE CONSOLE EXITED *****************
> >
> > 2)
> > it prints:
> > Using config file "hello".
> > Started domain IvanOS, console on port 9628
> > ************ REMOTE CONSOLE: CTRL-] TO QUIT ********
> >
> > ************ REMOTE CONSOLE EXITED *****************
> > (104, 'Connection reset by peer')
> > Error: Error connecting to xend, is xend running?
> >
> > xend is running. in both cases xend.log shows
> > --SNIP--
> > [2005-10-02 19:10:32 xend] INFO (XendRoot:112) EVENT>
> > xend.console.create [13,
> > 28, 9628]
> > [2005-10-02 19:10:32 xend] DEBUG (blkif:155) Connecting blkif
> > <BlkifBackendInterface 28 0>
> > [2005-10-02 19:10:32 xend] INFO (XendRoot:112) EVENT>
> > xend.domain.create
> > ['IvanOS', '28']
> > [2005-10-02 19:10:32 xend] INFO (XendRoot:112) EVENT>
> > xend.domain.unpause
> > ['IvanOS', '28']
> > [2005-10-02 19:10:32 xend] DEBUG (XendDomain:244) XendDomain>reap>
> > domain died
> > name=IvanOS id=28
> > [2005-10-02 19:10:32 xend] INFO (XendDomain:564) Destroying domain:
> > name=IvanOS
> > [2005-10-02 19:10:32 xend] DEBUG (XendDomainInfo:665) Destroying
> > vifs for
> > domain 28
> > --END SNIP--
> >
> > If someone could point out where im going wrong it would be very much
> > appreciated. Is there any way to get a more detailed trace of what
> > xen is
> > doing?
> >
> > Best regards
> > Ivan Kelly
> >
> > --SNIP go.S--
> > .section __xen_guest
> >         .ascii
> > "GUEST_OS=ivanos,GUEST_VER=2.0,XEN_VER=2.0,LOADER=generic"
> >         .byte 0
> >
> >         .text
> > .globl start
> >
> > start:
> >         cld
> >         movl $18,%eax
> >         movl $0,%ebx
> >         movl $hello_len,%ecx
> >         movl $ivanhello,%edx
> >         int $0x82
> >
> >         movl $6,%eax
> >         movl $2,%ebx
> >         movl $0,%ecx
> >         int  $0x82
> >
> > hang:   jmp hang
> >
> >
> > ivanhello:      .ascii "Welcome to Ivan Os. Have fun!\n"
> >         hello_len = . - ivanhello
> > --END SNIP--
> >
> > --SNIP Makefile--
> > CC := gcc
> > LD := ld
> >
> > # Linker should relocate monitor to this address
> > MONITOR_BASE := 0xE0100000
> >
> > # NB. '-Wcast-qual' is nasty, so I omitted it.
> > CFLAGS := -fno-builtin -O3 -Wall -I. -Wredundant-decls
> > CFLAGS += -Wstrict-prototypes -Wnested-externs -Wpointer-arith -
> > Winline -ansi
> >
> > OBJS :=
> > TARGET := ivanos
> >
> > default: $(TARGET)
> >
> > $(TARGET): go.o $(OBJS)
> >         $(LD) -N -Txen.lds go.o $(OBJS) -o $@.elf
> >         objcopy -R .note -R .comment $@.elf $@
> >         gzip -f -9 -c $@ >$@.gz
> >
> > clean:
> >         find . -type f -name '*.o' | xargs rm -f
> >         rm -f *.o *~ core $(TARGET).elf $(TARGET).raw $(TARGET) $
> > (TARGET).gz
> >         find . -type l | xargs rm -f
> >
> > %.o: %.c $(HDRS) Makefile
> >         $(CC) $(CFLAGS) -c $< -o $@
> >
> > %.o: %.S $(HDRS) Makefile
> >         $(CC) $(CFLAGS) -D__ASSEMBLY__ -c $< -o $@
> > --END SNIP--
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
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