[Xen-devel] XEN) vmx.c:2652:d1 Bad vmexit (reason 31) with Xen 4.0.1-rc7-pre (cs/ 23029)

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

I've been hitting this only on my Intel boxes. And only on
the Nehelem ones. The older Core2Duo don't seem to encounter this.

The guest config is quite simple:

kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory=1024
#maxmem=1024
maxvcpus = 4
serial='pty'
vcpus = 2
disk = [ 'file:/mnt/lab/latest/root_image.iso,hdc:cdrom,r']
boot="dn"
vif = [ 'type=ioemu,model=e1000,mac=00:0F:4B:00:00:71, bridge=switch' ]
vfb = [ 'vnc=1, vnclisten=0.0.0.0,vncunused=1']

And this is what shows up after I do 'xm create hvm.xm' (or xl create hvm.xm).

  alloc irq_desc for 4223 on node -1
  alloc kstat_irqs on node -1
(XEN) vmx.c:2652:d1 Bad vmexit (reason 31)
(XEN) domain_crash called from vmx.c:2653
(XEN) Domain 1 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.1.0-rc7-pre  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    0
(XEN) RIP:    0000:[<0000000000000000>]
(XEN) RFLAGS: 0000000000010002   CONTEXT: hvm guest
(XEN) rax: 0000000000000001   rbx: 0000000000000000   rcx: 0000000000000000
(XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000000000
(XEN) rbp: 0000000000000000   rsp: 0000000000000000   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: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: 0000
switch: port 2(tap1.0) entering disabled state
switch: port 2(tap1.0) entering disabled state

The Dom0 is 2.6.32.32 + for-2.6.32/bug-fixes, but the bug-fixes branch
has only bootup fixes so it should not affect this.

If I try the same exact guest configuration on a
Intel(R) Core(TM)2 Duo CPU     E6550  @ 2.33GHz

It works without trouble.

Here is what 'xl info' has to say about this machine:
[konrad@tst009 install]$ sudo xl info
host                   : tst009.dumpdata.com
release                : 2.6.32.32-stock-01616-g9b34843
version                : #27 SMP PREEMPT Thu Mar 17 15:58:57 EDT 2011
machine                : x86_64
nr_cpus                : 16
nr_nodes               : 2
cores_per_socket       : 8
threads_per_core       : 1
cpu_mhz                : 2000
hw_caps                : 
bfebfbff:28100800:00000000:00003b40:00bce3bd:00000000:00000001:00000000
virt_caps              : hvm
total_memory           : 12279
free_memory            : 1656
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .0-rc7-pre
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Fri Mar 11 18:22:23 2011 +0000 23029:a8fee4ad3ad0
xen_commandline        : guest_loglvl=all loglvl=all console=com1,vga 
com1=115200,8n1 console_to_ring cpuinfo apic=debug  iommu=verbose,off
cc_compiler            : gcc version 4.4.4 20100630 (Red Hat 4.4.4-10) (GCC) 
cc_compile_by          : konrad
cc_compile_domain      : dumpdata.com
cc_compile_date        : Mon Mar 14 12:52:11 EDT 2011
xend_config_format     : 4


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