linux-kernel - Re: [PATCH 23/42] KVM: Activate Virtualization On Demand

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Date:	Mon, 16 Aug 2010 15:24:08 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
Cc:	Dieter Ries <mail@...terries.net>, Avi Kivity <avi@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 23/42] KVM: Activate Virtualization On Demand


On 08.08.2010, at 14:02, Serge Belyshev wrote:

> Hi! Since the above patch went in
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=10474ae8
> I have exactly the same problem as Dieter.
> 
>>>> If that's the case I'd say you have a broken BIOS or bootloader.
>>> 
>>> You are right, it seems to be always cpu0. I'll check my BIOS and flash
>>> a newer version if available.
>> 
>> Please do. If that doesn't help ping me again. I'll write up a quirk patch then.
>> 
> 
> My h/w is a bit different (cpu: 9850 B3, mb: GA-MA790FX-DQ6 bios F7b),
> but I cannot use latest available BIOS (F7d) as it breaks my SAS controller.
> 
> So I guess I need the quirk patch.

Hrm - try to use the following (probably whitespace broken and 100% untested) hacky patch:

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 56c9b6b..bde9ee3 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -429,9 +429,11 @@ static int svm_hardware_enable(void *garbage)
        struct desc_struct *gdt;
        int me = raw_smp_processor_id();
 
+#if 0
        rdmsrl(MSR_EFER, efer);
        if (efer & EFER_SVME)
                return -EBUSY;
+#endif
 
        if (!has_svm()) {
                printk(KERN_ERR "svm_hardware_enable: err EOPNOTSUPP on %d\n",


Alex--
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