linux-kernel - Cannot boot xen DomU

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Date:	Thu, 17 Jan 2008 17:13:02 +0100
From:	xming <xmingske@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Cannot boot xen DomU > 2.6.23.1

Hi,

I finally found the piece of code that prevents me from booting Xen DomU
with vallina kernel > 2.6.23.1.

The problem is that with every kernel (> 2.6.32.1 including 2.6.24 RCs)
will just hang with "too much" console activity. Sometimes (well most
of the time) boot msg is too much. When I can boot into the kernel,
generating a lots of cosole out it will hang, no oops, no more
console/network. Generating with the same way through ssh will not
hang the domU.

When I reverse the following patch, things work as before, tried this
with 2.6.23.14 and 2.6.14-rc8. But I don't have the knowledge to
understand the reason behind this.

BTW, I am not subscribed.

--- a/include/xen/interface/vcpu.h
+++ b/include/xen/interface/vcpu.h
@@ -160,8 +160,9 @@ struct vcpu_set_singleshot_timer {
  */
 #define VCPUOP_register_vcpu_info   10  /* arg == struct vcpu_info */
 struct vcpu_register_vcpu_info {
-    uint32_t mfn;               /* mfn of page to place vcpu_info */
-    uint32_t offset;            /* offset within page */
+    uint64_t mfn;    /* mfn of page to place vcpu_info */
+    uint32_t offset; /* offset within page */
+    uint32_t rsvd;   /* unused */
 };

 #endif /* __XEN_PUBLIC_VCPU_H__ */

I am running Xen 3.1.2 PAE

# uname -a
Linux builder 2.6.24-rc8 #2 SMP Thu Jan 17 16:37:19 CET 2008 i686
AMD Athlon(tm) X2 Dual Core Processor BE-2300 AuthenticAMD GNU/Linux

# cat /proc/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 107
model name      : AMD Athlon(tm) X2 Dual Core Processor BE-2300
stepping        : 1
cpu MHz         : 1899.930
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu tsc msr pae mce cx8 mca cmov pat pse36 clflush
mmx fxsr sse sse2 ht nx mmxext fxsr_opt lm 3dnowext 3dnow pni cx16
lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch ts fid vid ttp
tm stc 100mhzsteps
bogomips        : 3829.72
clflush size    : 64

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 107
model name      : AMD Athlon(tm) X2 Dual Core Processor BE-2300
stepping        : 1
cpu MHz         : 1899.930
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu tsc msr pae mce cx8 mca cmov pat pse36 clflush
mmx fxsr sse sse2 ht nx mmxext fxsr_opt lm 3dnowext 3dnow pni cx16
lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch ts fid vid ttp
tm stc 100mhzsteps
bogomips        : 3829.72
clflush size    : 64
--
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