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"-cpu host" AMD Host

DISCUSSION Martin Gallant 2 participants 4 messages Oct 26, 2009 – Oct 27, 2009

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Martin Gallant

author
#0 lore raw

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

#1 lore raw
Quoted 3 lines · Martin Gallant

Is “–cpu host” supported on AMD hosts?

Yes.

Quoted 4 lines

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

Quoted 9 lines

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.

Signature · 1 line
error compiling committee.c: too many arguments to function
#2 lore raw
Quoted 13 lines · Avi Kivity
Quoted 2 lines · Martin Gallant

Is “–cpu host” supported on AMD hosts?

Yes.

Quoted 7 lines

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)

Quoted 8 lines
Quoted 5 lines

/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.

Signature · 1 line
error compiling committee.c: too many arguments to function
Quoted 1 line

From d8e9cf4f4f688873456b297d78be70c5c328489c Mon Sep 17 00:00:00 2001

From: Andre Przywara <[email protected]>
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 <[email protected]>
Signed-off-by Avi Kivity <[email protected]>
(cherry picked from commit 1fdbd48c242db996107f72ae4140ffe8163e26a8)
---
 arch/x86/kvm/x86.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
arch/x86/kvm/x86.c +1 -0
index 8aafb62..aa4c46f 100644
@@ -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:
Signature · 1 line
1.6.5.2
author
#3 lore raw

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:[email protected]]
Sent: Tuesday, October 27, 2009 4:58 AM
To: Martin Gallant
Cc: [email protected]
Subject: Re: "-cpu host" AMD Host

Quoted 13 lines · Avi Kivity
Quoted 2 lines · Martin Gallant

Is "-cpu host" supported on AMD hosts?

Yes.

Quoted 7 lines

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)

Quoted 8 lines
Quoted 5 lines

/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

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