Re: [Xen-devel] [RFC PATCH 1/5] Support for running secondary emulators

[Matt Wilson <msw@xxxxxxxxx>]

On Thu, Jan 30, 2014 at 02:19:45PM +0000, Paul Durrant wrote:
> This patch series adds the ioreq server interface which I mentioned in
> my talk at the Xen developer summit in Edinburgh at the end of last year.
> The code is based on work originally done by Julien Grall but has been
> re-written to allow existing versions of QEMU to work unmodified.
> 
[...]

Hi Paul,

I'm coming back to play with this after a few weeks and I'm having
trouble getting things going. It seems that I'm crashing early when
hvmloader is programming the PCI-ISA bridge link routes.

(XEN) hvm.c:712:d0 hvm_create_ioreq_server: 9:0
(d9) HVM Loader
(d9) Detected Xen v4.4-rc2
(d9) Xenbus rings @0xfeffd000, event channel 1
(d9) System requested SeaBIOS
(d9) CPU speed is 1995 MHz
(d9) Relocating guest memory for lowmem MMIO space disabled
(XEN) io.c:170:d9 Weird HVM ioemulation status 1.
(XEN) domain_crash called from io.c:171
(XEN) Domain 9 (vcpu#0) crashed on cpu#15:
(XEN) ----[ Xen-4.4-rc2  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    15
(XEN) RIP:    0018:[<0000000000100965>]
(XEN) RFLAGS: 0000000000000046   CONTEXT: hvm guest
(XEN) rax: 0000000000000005   rbx: 0000000000000001   rcx: 000000000000000a
(XEN) rdx: 0000000000000cfc   rsi: 0000000000000000   rdi: 0000000000000005
(XEN) rbp: 0000000000185d6c   rsp: 0000000000185d6c   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000011   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 0020   es: 0020   fs: 0020   gs: 0020   ss: 0020   cs: 0018
(XEN) hvm.c:790:d0 hvm_destroy_ioreq_server: 9:0

Any quick ideas before I go instrumenting things?

--msw

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