KVM Bug with Windows 2000

KVM Bug with Windows 2000

[Daniel Hecken]

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Hello!

I have installed Windows 2000 on KVM SVN snapshot 4539 and the module
from the git master branch. My Computer has an Intel Core 2 Duo and runs
an x86 distribution (Ubuntu Feisty with Kernel 2.6.20).

After the installation without kvm I tried to start the image with kvm
and get the exception in the appendix.

I start kvm with "-localtime -usb -usbdevice tablet -k de -net
nic,model=rtl8139 -net user -monitor tcp::10023,server,nowait -m 384"
and a raw image.

Daniel



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Re: KVM Bug with Windows 2000

[Avi Kivity]

Daniel Hecken wrote:
> Hello!
>
> I have installed Windows 2000 on KVM SVN snapshot 4539 and the module
> from the git master branch. My Computer has an Intel Core 2 Duo and runs
> an x86 distribution (Ubuntu Feisty with Kernel 2.6.20).
>
> After the installation without kvm I tried to start the image with kvm
> and get the exception in the appendix.
>
> I start kvm with "-localtime -usb -usbdevice tablet -k de -net
> nic,model=rtl8139 -net user -monitor tcp::10023,server,nowait -m 384"
> and a raw image.
>   

I've seen that too.  It dates from the qemu 0.9.0 merge; back then I 
hacked the bios to avoid it, and I guess it wasn't fixed by the recent 
changes, merely made less reproducible.

I'll try to track it down.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: KVM Bug with Windows 2000

[Avi Kivity]

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Daniel Hecken wrote:
> Hello!
>
> I have installed Windows 2000 on KVM SVN snapshot 4539 and the module
> from the git master branch. My Computer has an Intel Core 2 Duo and runs
> an x86 distribution (Ubuntu Feisty with Kernel 2.6.20).
>
> After the installation without kvm I tried to start the image with kvm
> and get the exception in the appendix.
>
>   

Let me know if the attached patch fixes this.

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


[-- Attachment #2: win-acpi-boot.patch --]
[-- Type: text/x-patch, Size: 533 bytes --]

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 55139e0..a721b60 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -618,7 +618,7 @@ static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
 {
 	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
 
-	if (vmcs_readl(sf->base) == save->base) {
+	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
 		vmcs_write16(sf->selector, save->selector);
 		vmcs_writel(sf->base, save->base);
 		vmcs_write32(sf->limit, save->limit);

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Re: KVM Bug with Windows 2000

[Daniel Hecken]

Hello Avi,

it works with this patch. I got an Windows 2000 with an ACPI HAL which
can boot now.

Thanks

Daniel

PS. Have you applied this patch to KVM 17?

Avi Kivity schrieb:
> Daniel Hecken wrote:
>> Hello!
>>
>> I have installed Windows 2000 on KVM SVN snapshot 4539 and the module
>> from the git master branch. My Computer has an Intel Core 2 Duo and runs
>> an x86 distribution (Ubuntu Feisty with Kernel 2.6.20).
>>
>> After the installation without kvm I tried to start the image with kvm
>> and get the exception in the appendix.
>>
>>   
>
> Let me know if the attached patch fixes this.
>
> ------------------------------------------------------------------------
>
> diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
> index 55139e0..a721b60 100644
> --- a/drivers/kvm/vmx.c
> +++ b/drivers/kvm/vmx.c
> @@ -618,7 +618,7 @@ static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
>  {
>  	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
>  
> -	if (vmcs_readl(sf->base) == save->base) {
> +	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
>  		vmcs_write16(sf->selector, save->selector);
>  		vmcs_writel(sf->base, save->base);
>  		vmcs_write32(sf->limit, save->limit);
>   



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Re: KVM Bug with Windows 2000

[Daniel Hecken]

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Sorry, that was the wrong picture.

Daniel

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