guest reboot hanging - kvm: unhandled wrmsr: 0xc0000083

guest reboot hanging - kvm: unhandled wrmsr: 0xc0000083

[tadomeit]

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Hi,

I've installed the latest version kvm-33 on my PC. All guests (tested
with several knoppix version and SuSE 10.1 install dvd image) hanging on
reboot. In the host syslog I found a lot of messages (>1000): "kernel:
kvm: unhandled wrmsr: 0xc0000083"

I've tested with the original kernel kvm modules and with the modules
delivered with kvm-33, I tried the version kvm-32 - no success - every
time the same behaviour!

My startup command (without problems if using using the -no-kvm option):
qemu-system-x86_64 -boot d -m 384 -cdrom
/data/temp/SUSE-Linux-10.1-GM-DVD-i386.iso

My box:
fritz:~ # uname -a
Linux fritz 2.6.22.1-default #3 SMP Fri Jul 27 12:22:16 CEST 2007 i686
athlon i386 GNU/Linux

fritz:~ # cat /proc/cpuinfo
processor       : 0 (same for core 1)
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 75
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4200+
stepping        : 2
cpu MHz         : 1000.000
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
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 vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht s
yscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm
cmp_legacy svm extapic cr8legacy ts fid vid ttp tm s
tc
bogomips        : 2005.81
clflush size    : 64


Best regards
Tom

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Re: guest reboot hanging - kvm: unhandled wrmsr: 0xc0000083

[Avi Kivity]

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tadomeit wrote:
> Hi,
>
> I've installed the latest version kvm-33 on my PC. All guests (tested
> with several knoppix version and SuSE 10.1 install dvd image) hanging on
> reboot. In the host syslog I found a lot of messages (>1000): "kernel:
> kvm: unhandled wrmsr: 0xc0000083"
>
> I've tested with the original kernel kvm modules and with the modules
> delivered with kvm-33, I tried the version kvm-32 - no success - every
> time the same behaviour!
>
>   
Can you try the attached patch?


-- 
error compiling committee.c: too many arguments to function


[-- Attachment #2: i386-no-long-mode.patch --]
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commit d9ff68d1414c64477a06bb9d35633f7c45d4942a
Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Date:   Mon Jul 30 12:48:15 2007 +0300

    kvm: qemu: disable long mode on 32-bit kernels

diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index a19219c..4ba93d8 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -18,6 +18,7 @@ int kvm_allowed = KVM_ALLOWED_DEFAULT;
 #include "qemu-kvm.h"
 #include <kvmctl.h>
 #include <pthread.h>
+#include <sys/utsname.h>
 
 #define MSR_IA32_TSC		0x10
 
@@ -999,11 +1000,15 @@ static void do_cpuid_ent(struct kvm_cpuid_entry *e, uint32_t function,
     e->edx = env->regs[R_EDX];
     if (function == 0x80000001) {
 	uint32_t h_eax, h_edx;
+	struct utsname utsname;
+	int lm_capable_kernel;
 
 	host_cpuid(function, &h_eax, NULL, NULL, &h_edx);
+	uname(&utsname);
+	lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
 
 	// long mode
-	if ((h_edx & 0x20000000) == 0)
+	if ((h_edx & 0x20000000) == 0 || !lm_capable_kernel)
 	    e->edx &= ~0x20000000u;
 	// syscall
 	if ((h_edx & 0x00000800) == 0)

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Re: guest reboot hanging - kvm: unhandled wrmsr: 0xc0000083

[tadomeit]

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Hi,

thank you for the answer! I've tried the patch - but with the same
result :-( (with 2.6.22 original and the kvm-33 modules)

Best regards
Tom

Avi Kivity schrieb:
> tadomeit wrote:
>> Hi,
>>
>> I've installed the latest version kvm-33 on my PC. All guests (tested
>> with several knoppix version and SuSE 10.1 install dvd image) hanging on
>> reboot. In the host syslog I found a lot of messages (>1000): "kernel:
>> kvm: unhandled wrmsr: 0xc0000083"
>>
>> I've tested with the original kernel kvm modules and with the modules
>> delivered with kvm-33, I tried the version kvm-32 - no success - every
>> time the same behaviour!
>>
>>   
> Can you try the attached patch?
> 
> 

[-- Attachment #2: i386-no-long-mode.patch --]
[-- Type: text/x-patch, Size: 1060 bytes --]

commit d9ff68d1414c64477a06bb9d35633f7c45d4942a
Author: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Date:   Mon Jul 30 12:48:15 2007 +0300

    kvm: qemu: disable long mode on 32-bit kernels

diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index a19219c..4ba93d8 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -18,6 +18,7 @@ int kvm_allowed = KVM_ALLOWED_DEFAULT;
 #include "qemu-kvm.h"
 #include <kvmctl.h>
 #include <pthread.h>
+#include <sys/utsname.h>
 
 #define MSR_IA32_TSC		0x10
 
@@ -999,11 +1000,15 @@ static void do_cpuid_ent(struct kvm_cpuid_entry *e, uint32_t function,
     e->edx = env->regs[R_EDX];
     if (function == 0x80000001) {
 	uint32_t h_eax, h_edx;
+	struct utsname utsname;
+	int lm_capable_kernel;
 
 	host_cpuid(function, &h_eax, NULL, NULL, &h_edx);
+	uname(&utsname);
+	lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
 
 	// long mode
-	if ((h_edx & 0x20000000) == 0)
+	if ((h_edx & 0x20000000) == 0 || !lm_capable_kernel)
 	    e->edx &= ~0x20000000u;
 	// syscall
 	if ((h_edx & 0x00000800) == 0)

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