[Xen-devel] Re: xenpaging fixes for kernel and hypervisor

[Olaf Hering <olaf@xxxxxxxxx>]

Patrick,

there are three more changes to make xenpaging more robust.
Do you need to ack each one to get them merged in xen-unstable?
Should any of these changes go also into the xen-4.0-testing tree for
the 4.0.2 release? If so, I will prepare the patches for this branch.


One more thing: In an earlier mail you mentioned that realmode support
is not there yet. However, in my testing I can run grub and the bios and
even boot into Linux a bit. So it appears there is realmode support,
perhaps still incomplete because the guest crashes in (appearently)
early Linux init functions:

(XEN) realmode.c:115:d1 Failed to emulate insn.
(XEN) realmode.c:165:d1 Real-mode emulation failed @ 9000:0000f81a: 0f 00 00 00 
00 00
(XEN) domain_crash called from realmode.c:166
(XEN) Domain 1 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.0.1_21326_01-20100922.141534  x86_64  debug=y  Tainted:    C 
]----
(XEN) CPU:    0
(XEN) RIP:    9000:[<000000000000f81a>]
(XEN) RFLAGS: 0000000000000246   CONTEXT: hvm guest
(XEN) rax: 0000000000000000   rbx: 0000000000008fb8   rcx: 0000000000000000
(XEN) rdx: 0000000000009000   rsi: 0000000000000008   rdi: 0000000000099fff
(XEN) rbp: 000000000000ffff   rsp: 0000000000001ff2   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000010   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 0000   es: 9000   fs: 9000   gs: 9000   ss: 9000   cs: 9000
(XEN) cpupool_rm_domain(dom=1,pool=0) n_dom 1
[  127.709423] br0: port 2(vif1.0) entering disabled state
[  127.732999] br0: port 2(vif1.0) entering disabled state

I'm poking around and adding debug to the gfn_to_mfn* functions, but none 
triggers.
Where should I start looking for this kind of bug?

Olaf


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