Re: Centrino Duo not working so hot

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

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David Brown wrote:
>> Yeah the upgrade to sid went okay so there must be something else
>> wrong with my netboot setup.
>>
>> Thanks for the patch when will it make it into the default kernel?
>
> Uhm, crap... found some more stuff didn't seem to affect the guest OS
> or the host for that matter...
>
> This is from dmesg... first line is from when the tap device hooks
> into the bridge for the network the rest is when things start
> loading...
>
> br0: port 2(tap1) entering learning state
> vmwrite error: reg 2010 value 1f92 (err 8208)

That patch is hopelessly broken; try this instead (revert the old one 
first).

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


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diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index b909b54..08908c0 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -160,6 +160,7 @@ static void __vcpu_clear(void *arg)
 		vmcs_clear(vcpu->vmcs);
 	if (per_cpu(current_vmcs, cpu) == vcpu->vmcs)
 		per_cpu(current_vmcs, cpu) = NULL;
+	rdtscll(vcpu->host_tsc);
 }
 
 static void vcpu_clear(struct kvm_vcpu *vcpu)
@@ -376,6 +377,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
 {
 	u64 phys_addr = __pa(vcpu->vmcs);
 	int cpu;
+	u64 tsc_this, delta;
 
 	cpu = get_cpu();
 
@@ -409,6 +411,13 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
 
 		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
 		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
+
+		/*
+		 * Make sure the time stamp counter is monotonous.
+		 */
+		rdtscll(tsc_this);
+		delta = vcpu->host_tsc - tsc_this;
+		vmcs_write64(TSC_OFFSET, vmcs_read64(TSC_OFFSET) + delta);
 	}
 }
 

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