Re: "-cpu host" AMD Host

[Avi Kivity <avi@redhat.com>]

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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


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>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