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

[Scott Parish <srparish@xxxxxxxxxx>]

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;

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--
>
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