Moving a PV Linux kernel

Moving a PV Linux kernel

[Michael Abd-El-Malek]

I'm trying to change where a 64-bit PV Linux kernel resides.  So I  
changed __START_KERNEL_map	from 0xffffffff80000000UL to  
0xffffffffc0000000UL in linux-2.6.18-xen.hg/include/asm-x86_64/mach- 
xen/asm/page.h.  When I tried to boot that kernel, I got the following  
error message from xm create:
Error: (1, 'Internal error', 'arch_setup_bootlate: pin_table failed  
(pfn 0x7b5, rc=1)\n')

I spent some time trying digging into the hypervisor to understand the  
above message, but I didn't get anywhere.

So I have two questions:
1) Why is the above error message happening?
2) Am I forgetting any other place where constants need to change?   
(Either in the Linux kernel tree or in Xen.)

Thanks,
Mike

Re: Moving a PV Linux kernel

[Michael Abd-El-Malek]

I forgot to include the hypervisor's log.  Here it is:

(XEN) mm.c:1956:d0 Bad type (saw 00000000e8000001 != exp 0000000020000000) for 
mfn 21d95a (pfn 200) (count = 1)
(XEN) mm.c:740:d0 Attempt to create linear p.t. with write perms
(XEN) mm.c:1167:d0 Failure in alloc_l2_table: entry 0
(XEN) mm.c:1980:d0 Error while validating mfn 21d3a1 (pfn 7b9) for type 
0000000040000000: caf=80000002 taf=0000000040000001
(XEN) mm.c:765:d0 Attempt to create linear p.t. with write perms
(XEN) mm.c:1241:d0 Failure in alloc_l3_table: entry 1
(XEN) mm.c:1980:d0 Error while validating mfn 21d3a3 (pfn 7b7) for type 
0000000060000000: caf=80000002 taf=0000000060000001
(XEN) mm.c:790:d0 Attempt to create linear p.t. with write perms
(XEN) mm.c:1287:d0 Failure in alloc_l4_table: entry 511
(XEN) mm.c:1980:d0 Error while validating mfn 21d3a5 (pfn 7b5) for type 
0000000080000000: caf=80000002 taf=0000000080000001

Any pointers would be greatly appreciated.

Cheers,
Mike


Michael Abd-El-Malek wrote:
> I'm trying to change where a 64-bit PV Linux kernel resides.  So I 
> changed __START_KERNEL_map    from 0xffffffff80000000UL to 
> 0xffffffffc0000000UL in 
> linux-2.6.18-xen.hg/include/asm-x86_64/mach-xen/asm/page.h.  When I 
> tried to boot that kernel, I got the following error message from xm 
> create:
> Error: (1, 'Internal error', 'arch_setup_bootlate: pin_table failed (pfn 
> 0x7b5, rc=1)\n')
> 
> I spent some time trying digging into the hypervisor to understand the 
> above message, but I didn't get anywhere.
> 
> So I have two questions:
> 1) Why is the above error message happening?
> 2) Am I forgetting any other place where constants need to change?  
> (Either in the Linux kernel tree or in Xen.)
> 
> Thanks,
> Mike