"-cpu host" AMD Host

"-cpu host" AMD Host

[Martin Gallant]

Is “–cpu host” supported on AMD hosts?

Whenever I try to use this option on a Windows Vista/7 client, I get blue
screen.
Removing the option, the client works fine.

Host kernel 2.6.31.4.  Userspace is qemu-kvm-0.11.0.  (Previous versions
fail too)

/proc/cpuinfo snippet:
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 107
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+

Thanks,

--
Marty

Re: "-cpu host" AMD Host

[Avi Kivity]

On 10/26/2009 09:55 PM, Martin Gallant wrote:
> Is “–cpu host” supported on AMD hosts?
>
>    

Yes.

> Whenever I try to use this option on a Windows Vista/7 client, I get blue
> screen.
> Removing the option, the client works fine.
>
> Host kernel 2.6.31.4.  Userspace is qemu-kvm-0.11.0.  (Previous versions
> fail too)
>
> /proc/cpuinfo snippet:
> vendor_id       : AuthenticAMD
> cpu family      : 15
> model           : 107
> model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
>    

Please post the flags : field as well.

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

Re: "-cpu host" AMD Host

[Avi Kivity]

[-- Attachment #1: Type: text/plain, Size: 704 bytes --]

On 10/27/2009 11:39 AM, Avi Kivity wrote:
> On 10/26/2009 09:55 PM, Martin Gallant wrote:
>> Is “–cpu host” supported on AMD hosts?
>>
>
> Yes.
>
>> Whenever I try to use this option on a Windows Vista/7 client, I get 
>> blue
>> screen.
>> Removing the option, the client works fine.
>>
>> Host kernel 2.6.31.4.  Userspace is qemu-kvm-0.11.0.  (Previous versions
>> fail too)
>>
>> /proc/cpuinfo snippet:
>> vendor_id       : AuthenticAMD
>> cpu family      : 15
>> model           : 107
>> model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
>
> Please post the flags : field as well.
>

You might try the attached patch.


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


[-- Attachment #2: 0001-KVM-ignore-reads-from-AMDs-C1E-enabled-MSR.patch --]
[-- Type: text/x-patch, Size: 1121 bytes --]

>From d8e9cf4f4f688873456b297d78be70c5c328489c Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@amd.com>
Date: Wed, 24 Jun 2009 12:44:34 +0200
Subject: [PATCH -stable] KVM: ignore reads from AMDs C1E enabled MSR

If the Linux kernel detects an C1E capable AMD processor (K8 RevF and
higher), it will access a certain MSR on every attempt to go to halt.
Explicitly handle this read and return 0 to let KVM run a Linux guest
with the native AMD host CPU propagated to the guest.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
(cherry picked from commit 1fdbd48c242db996107f72ae4140ffe8163e26a8)
---
 arch/x86/kvm/x86.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8aafb62..aa4c46f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -949,6 +949,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_P6_EVNTSEL0:
 	case MSR_P6_EVNTSEL1:
 	case MSR_K7_EVNTSEL0:
+	case MSR_K8_INT_PENDING_MSG:
 		data = 0;
 		break;
 	case MSR_MTRRcap:
-- 
1.6.5.2

RE: "-cpu host" AMD Host

[Martin Gallant]

[-- Attachment #1: Type: text/plain, Size: 1074 bytes --]

I still see the problem with the kernel patch applied.

/proc/cpuinfo attached

Will post a formal bug report with all dumps in a few minutes.

Thanks for the quick response.

--
Marty

-----Original Message-----
From: Avi Kivity [mailto:avi@redhat.com] 
Sent: Tuesday, October 27, 2009 4:58 AM
To: Martin Gallant
Cc: kvm@vger.kernel.org
Subject: Re: "-cpu host" AMD Host

On 10/27/2009 11:39 AM, Avi Kivity wrote:
> On 10/26/2009 09:55 PM, Martin Gallant wrote:
>> Is "-cpu host" supported on AMD hosts?
>>
>
> Yes.
>
>> Whenever I try to use this option on a Windows Vista/7 client, I get 
>> blue screen.
>> Removing the option, the client works fine.
>>
>> Host kernel 2.6.31.4.  Userspace is qemu-kvm-0.11.0.  (Previous 
>> versions fail too)
>>
>> /proc/cpuinfo snippet:
>> vendor_id       : AuthenticAMD
>> cpu family      : 15
>> model           : 107
>> model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
>
> Please post the flags : field as well.
>

You might try the attached patch.


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


[-- Attachment #2: cpuinfo.txt --]
[-- Type: text/plain, Size: 1570 bytes --]

processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 15
model		: 107
model name	: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
stepping	: 2
cpu MHz		: 2700.000
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 2
apicid		: 0
initial apicid	: 0
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 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch
bogomips	: 5429.84
TLB size	: 1024 4K pages
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc 100mhzsteps

processor	: 1
vendor_id	: AuthenticAMD
cpu family	: 15
model		: 107
model name	: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
stepping	: 2
cpu MHz		: 2700.000
cache size	: 512 KB
physical id	: 0
siblings	: 2
core id		: 1
cpu cores	: 2
apicid		: 1
initial apicid	: 1
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 syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch
bogomips	: 5429.84
TLB size	: 1024 4K pages
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc 100mhzsteps