[kvm-ppc-devel] [PATCH 0 of 2] A couple ifdefs

[kvm-ppc-devel] [PATCH 0 of 2] A couple ifdefs

[Hollis Blanchard]

These small ifdefs are necessary for integration of the PowerPC port.

3 files changed, 9 insertions(+)
arch/x86/kvm/Kconfig     |    5 +++++
include/linux/kvm_host.h |    2 ++
virt/kvm/kvm_main.c      |    2 ++

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[PATCH 0 of 2] A couple ifdefs

[Hollis Blanchard]

These small ifdefs are necessary for integration of the PowerPC port.

3 files changed, 9 insertions(+)
arch/x86/kvm/Kconfig     |    5 +++++
include/linux/kvm_host.h |    2 ++
virt/kvm/kvm_main.c      |    2 ++

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[kvm-ppc-devel] [PATCH 1 of 2] Define and use CONFIG_KVM_HAS_PIO so

[Hollis Blanchard]

# HG changeset patch
# User Hollis Blanchard <hollisb@us.ibm.com>
# Date 1200434310 21600
# Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
# Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

---
2 files changed, 7 insertions(+)
arch/x86/kvm/Kconfig |    5 +++++
virt/kvm/kvm_main.c  |    2 ++


diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -33,9 +33,13 @@ config KVM
 
 	  If unsure, say N.
 
+config KVM_HAS_PIO
+	bool
+
 config KVM_INTEL
 	tristate "KVM for Intel processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on Intel processors equipped with the VT
 	  extensions.
@@ -43,6 +47,7 @@ config KVM_AMD
 config KVM_AMD
 	tristate "KVM for AMD processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on AMD processors equipped with the AMD-V
 	  (SVM) extensions.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -677,8 +677,10 @@ static int kvm_vcpu_fault(struct vm_area
 
 	if (vmf->pgoff = 0)
 		page = virt_to_page(vcpu->run);
+#ifdef CONFIG_KVM_HAS_PIO
 	else if (vmf->pgoff = KVM_PIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->arch.pio_data);
+#endif /* CONFIG_KVM_HAS_PIO */
 	else
 		return VM_FAULT_SIGBUS;
 	get_page(page);

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[PATCH 1 of 2] Define and use CONFIG_KVM_HAS_PIO so that we don't need pio_data in kvm_arch_vcpu

[Hollis Blanchard]

# HG changeset patch
# User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
# Date 1200434310 21600
# Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
# Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378

Signed-off-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

---
2 files changed, 7 insertions(+)
arch/x86/kvm/Kconfig |    5 +++++
virt/kvm/kvm_main.c  |    2 ++


diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -33,9 +33,13 @@ config KVM
 
 	  If unsure, say N.
 
+config KVM_HAS_PIO
+	bool
+
 config KVM_INTEL
 	tristate "KVM for Intel processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on Intel processors equipped with the VT
 	  extensions.
@@ -43,6 +47,7 @@ config KVM_AMD
 config KVM_AMD
 	tristate "KVM for AMD processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on AMD processors equipped with the AMD-V
 	  (SVM) extensions.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -677,8 +677,10 @@ static int kvm_vcpu_fault(struct vm_area
 
 	if (vmf->pgoff == 0)
 		page = virt_to_page(vcpu->run);
+#ifdef CONFIG_KVM_HAS_PIO
 	else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->arch.pio_data);
+#endif /* CONFIG_KVM_HAS_PIO */
 	else
 		return VM_FAULT_SIGBUS;
 	get_page(page);

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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 1 of 2] Define and use

[Avi Kivity]

Hollis Blanchard wrote:
> # HG changeset patch
> # User Hollis Blanchard <hollisb@us.ibm.com>
> # Date 1200434310 21600
> # Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
> # Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378
>
> Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
> Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
>
> ---
> 2 files changed, 7 insertions(+)
> arch/x86/kvm/Kconfig |    5 +++++
> virt/kvm/kvm_main.c  |    2 ++
>
>
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -33,9 +33,13 @@ config KVM
>  
>  	  If unsure, say N.
>  
> +config KVM_HAS_PIO
> +	bool
> +
>  config KVM_INTEL
>  	tristate "KVM for Intel processors support"
>  	depends on KVM
> +	select KVM_HAS_PIO
>  	---help---
>  	  Provides support for KVM on Intel processors equipped with the VT
>  	  extensions.
> @@ -43,6 +47,7 @@ config KVM_AMD
>  config KVM_AMD
>  	tristate "KVM for AMD processors support"
>  	depends on KVM
> +	select KVM_HAS_PIO
>  	---help---
>  	  Provides support for KVM on AMD processors equipped with the AMD-V
>  	  (SVM) extensions.
>   

Too much Kconfig for this.  Since I want to do some Kconfig changes 
anyway, I'll do this another way.

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


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Re: [PATCH 1 of 2] Define and use CONFIG_KVM_HAS_PIO so that we don't need pio_data in kvm_arch_vcpu

[Avi Kivity]

Hollis Blanchard wrote:
> # HG changeset patch
> # User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> # Date 1200434310 21600
> # Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
> # Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378
>
> Signed-off-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> Signed-off-by: Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
>
> ---
> 2 files changed, 7 insertions(+)
> arch/x86/kvm/Kconfig |    5 +++++
> virt/kvm/kvm_main.c  |    2 ++
>
>
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -33,9 +33,13 @@ config KVM
>  
>  	  If unsure, say N.
>  
> +config KVM_HAS_PIO
> +	bool
> +
>  config KVM_INTEL
>  	tristate "KVM for Intel processors support"
>  	depends on KVM
> +	select KVM_HAS_PIO
>  	---help---
>  	  Provides support for KVM on Intel processors equipped with the VT
>  	  extensions.
> @@ -43,6 +47,7 @@ config KVM_AMD
>  config KVM_AMD
>  	tristate "KVM for AMD processors support"
>  	depends on KVM
> +	select KVM_HAS_PIO
>  	---help---
>  	  Provides support for KVM on AMD processors equipped with the AMD-V
>  	  (SVM) extensions.
>   

Too much Kconfig for this.  Since I want to do some Kconfig changes 
anyway, I'll do this another way.

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


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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 1 of 2] Define and use

[Carsten Otte]

Avi Kivity wrote:
> Too much Kconfig for this.  Since I want to do some Kconfig changes 
> anyway, I'll do this another way.
I think you overlooked something here. Actually this should change too 
if we don't have pio:
-.......case KVM_GET_VCPU_MMAP_SIZE:
-.......-.......r = -EINVAL;
-.......-.......if (arg)
-.......-.......-.......goto out;
-.......-.......r = 2 * PAGE_SIZE;
-.......-.......break;

so long,
Carsten

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Re: [PATCH 1 of 2] Define and use CONFIG_KVM_HAS_PIO so that we don't need pio_data in kvm_arch_vcpu

[Carsten Otte]

Avi Kivity wrote:
> Too much Kconfig for this.  Since I want to do some Kconfig changes 
> anyway, I'll do this another way.
I think you overlooked something here. Actually this should change too 
if we don't have pio:
-.......case KVM_GET_VCPU_MMAP_SIZE:
-.......-.......r = -EINVAL;
-.......-.......if (arg)
-.......-.......-.......goto out;
-.......-.......r = 2 * PAGE_SIZE;
-.......-.......break;

so long,
Carsten

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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 1 of 2] Define and use

[Avi Kivity]

Carsten Otte wrote:
> Avi Kivity wrote:
>> Too much Kconfig for this.  Since I want to do some Kconfig changes 
>> anyway, I'll do this another way.
> I think you overlooked something here. Actually this should change too 
> if we don't have pio:
> -.......case KVM_GET_VCPU_MMAP_SIZE:
> -.......-.......r = -EINVAL;
> -.......-.......if (arg)
> -.......-.......-.......goto out;
> -.......-.......r = 2 * PAGE_SIZE;
> -.......-.......break;
>

Right you are.  Fixup patch pushed.  Thanks.

-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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Re: [PATCH 1 of 2] Define and use CONFIG_KVM_HAS_PIO so that we don't need pio_data in kvm_arch_vcpu

[Avi Kivity]

Carsten Otte wrote:
> Avi Kivity wrote:
>> Too much Kconfig for this.  Since I want to do some Kconfig changes 
>> anyway, I'll do this another way.
> I think you overlooked something here. Actually this should change too 
> if we don't have pio:
> -.......case KVM_GET_VCPU_MMAP_SIZE:
> -.......-.......r = -EINVAL;
> -.......-.......if (arg)
> -.......-.......-.......goto out;
> -.......-.......r = 2 * PAGE_SIZE;
> -.......-.......break;
>

Right you are.  Fixup patch pushed.  Thanks.

-- 
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[kvm-ppc-devel] [PATCH 2 of 2] Use CONFIG_PREEMPT_NOTIFIERS around

[Hollis Blanchard]

# HG changeset patch
# User Hollis Blanchard <hollisb@us.ibm.com>
# Date 1200434370 21600
# Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
# Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
This allows kvm_host.h to be #included even when struct preempt_notifier is
undefined.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

---
1 file changed, 2 insertions(+)
include/linux/kvm_host.h |    2 ++


diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -66,7 +66,9 @@ void kvm_io_bus_register_dev(struct kvm_
 
 struct kvm_vcpu {
 	struct kvm *kvm;
+#ifdef CONFIG_PREEMPT_NOTIFIERS
 	struct preempt_notifier preempt_notifier;
+#endif
 	int vcpu_id;
 	struct mutex mutex;
 	int   cpu;

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[PATCH 2 of 2] Use CONFIG_PREEMPT_NOTIFIERS around struct preempt_notifier

[Hollis Blanchard]

# HG changeset patch
# User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
# Date 1200434370 21600
# Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
# Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
This allows kvm_host.h to be #included even when struct preempt_notifier is
undefined.

Signed-off-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

---
1 file changed, 2 insertions(+)
include/linux/kvm_host.h |    2 ++


diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -66,7 +66,9 @@ void kvm_io_bus_register_dev(struct kvm_
 
 struct kvm_vcpu {
 	struct kvm *kvm;
+#ifdef CONFIG_PREEMPT_NOTIFIERS
 	struct preempt_notifier preempt_notifier;
+#endif
 	int vcpu_id;
 	struct mutex mutex;
 	int   cpu;

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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 2 of 2] Use

[Avi Kivity]

Hollis Blanchard wrote:
> # HG changeset patch
> # User Hollis Blanchard <hollisb@us.ibm.com>
> # Date 1200434370 21600
> # Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
> # Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
> This allows kvm_host.h to be #included even when struct preempt_notifier is
> undefined.
>
>   

Don't you actually need preempt notifiers?  They are useful if you have 
state that is only needed from userspace, but is expensive to switch.  
For x86, this is the syscall msrs (which define the syscall entry 
point), the fpu (which is not used in the kernel), and a few other bits 
(which I'm too lazy too look up and are esoteric anyway).

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


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Re: [PATCH 2 of 2] Use CONFIG_PREEMPT_NOTIFIERS around struct preempt_notifier

[Avi Kivity]

Hollis Blanchard wrote:
> # HG changeset patch
> # User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> # Date 1200434370 21600
> # Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
> # Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
> This allows kvm_host.h to be #included even when struct preempt_notifier is
> undefined.
>
>   

Don't you actually need preempt notifiers?  They are useful if you have 
state that is only needed from userspace, but is expensive to switch.  
For x86, this is the syscall msrs (which define the syscall entry 
point), the fpu (which is not used in the kernel), and a few other bits 
(which I'm too lazy too look up and are esoteric anyway).

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


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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 2 of 2] Use

[Hollis Blanchard]

On Wed, 2008-01-16 at 10:08 +0200, Avi Kivity wrote:
> Hollis Blanchard wrote:
> > # HG changeset patch
> > # User Hollis Blanchard <hollisb@us.ibm.com>
> > # Date 1200434370 21600
> > # Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
> > # Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
> > This allows kvm_host.h to be #included even when struct preempt_notifier is
> > undefined.
> 
> Don't you actually need preempt notifiers?  They are useful if you have 
> state that is only needed from userspace, but is expensive to switch.  
> For x86, this is the syscall msrs (which define the syscall entry 
> point), the fpu (which is not used in the kernel), and a few other bits 
> (which I'm too lazy too look up and are esoteric anyway).

Yes, I do. However, if you #include <kvm_host.h> *without*
CONFIG_VIRTUALIZATION=y, CONFIG_PREEMPT_NOTIFIERS is not set and the
structure is undefined.

It is Linux policy to be able to unconditionally include headers, and
indeed I already hit this problem when I added that #include to
arch/powerpc/kernel/asm-offsets.c.

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: [PATCH 2 of 2] Use CONFIG_PREEMPT_NOTIFIERS around struct preempt_notifier

[Hollis Blanchard]

On Wed, 2008-01-16 at 10:08 +0200, Avi Kivity wrote:
> Hollis Blanchard wrote:
> > # HG changeset patch
> > # User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> > # Date 1200434370 21600
> > # Node ID 9878c9cec5f831ff5e9b97539aabc5fa3d934501
> > # Parent  931a81e1002110be0e8bf5b335bf199d43534c2c
> > This allows kvm_host.h to be #included even when struct preempt_notifier is
> > undefined.
> 
> Don't you actually need preempt notifiers?  They are useful if you have 
> state that is only needed from userspace, but is expensive to switch.  
> For x86, this is the syscall msrs (which define the syscall entry 
> point), the fpu (which is not used in the kernel), and a few other bits 
> (which I'm too lazy too look up and are esoteric anyway).

Yes, I do. However, if you #include <kvm_host.h> *without*
CONFIG_VIRTUALIZATION=y, CONFIG_PREEMPT_NOTIFIERS is not set and the
structure is undefined.

It is Linux policy to be able to unconditionally include headers, and
indeed I already hit this problem when I added that #include to
arch/powerpc/kernel/asm-offsets.c.

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 0 of 2] A couple ifdefs

[Avi Kivity]

Hollis Blanchard wrote:
> These small ifdefs are necessary for integration of the PowerPC port.
>
>   

Only patch 2 of 2 made it.

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


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Re: [PATCH 0 of 2] A couple ifdefs

[Avi Kivity]

Hollis Blanchard wrote:
> These small ifdefs are necessary for integration of the PowerPC port.
>
>   

Only patch 2 of 2 made it.

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


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Re: [kvm-ppc-devel] [kvm-devel] [PATCH 0 of 2] A couple ifdefs

[Christian Ehrhardt]

Avi Kivity wrote:
> Hollis Blanchard wrote:
>> These small ifdefs are necessary for integration of the PowerPC port.
>>
>>   
> 
> Only patch 2 of 2 made it.
> 
As Hollis should be sleeping right now I resend 1/2 as it arrived on kvm-powerpc-devel
(I hope my mail-app keeps the format this time)

-- 

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization

original mail
---

# HG changeset patch
# User Hollis Blanchard <hollisb@us.ibm.com>
# Date 1200434310 21600
# Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
# Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

---
2 files changed, 7 insertions(+)
arch/x86/kvm/Kconfig |    5 +++++
virt/kvm/kvm_main.c  |    2 ++


diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -33,9 +33,13 @@ config KVM

 	  If unsure, say N.

+config KVM_HAS_PIO
+	bool
+
 config KVM_INTEL
 	tristate "KVM for Intel processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on Intel processors equipped with the VT
 	  extensions.
@@ -43,6 +47,7 @@ config KVM_AMD
 config KVM_AMD
 	tristate "KVM for AMD processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on AMD processors equipped with the AMD-V
 	  (SVM) extensions.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -677,8 +677,10 @@ static int kvm_vcpu_fault(struct vm_area

 	if (vmf->pgoff = 0)
 		page = virt_to_page(vcpu->run);
+#ifdef CONFIG_KVM_HAS_PIO
 	else if (vmf->pgoff = KVM_PIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->arch.pio_data);
+#endif /* CONFIG_KVM_HAS_PIO */
 	else
 		return VM_FAULT_SIGBUS;
 	get_page(page);



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Re: [PATCH 0 of 2] A couple ifdefs

[Christian Ehrhardt]

Avi Kivity wrote:
> Hollis Blanchard wrote:
>> These small ifdefs are necessary for integration of the PowerPC port.
>>
>>   
> 
> Only patch 2 of 2 made it.
> 
As Hollis should be sleeping right now I resend 1/2 as it arrived on kvm-powerpc-devel
(I hope my mail-app keeps the format this time)

-- 

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization

original mail
---

# HG changeset patch
# User Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
# Date 1200434310 21600
# Node ID 7fa5947a2da8c0c7424ebdcfaebcae624d6cf015
# Parent  ee0c227fe3f6632f4b1b5fde3f7e05c8ea0a4378

Signed-off-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Christian Ehrhardt <ehrhardt-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>

---
2 files changed, 7 insertions(+)
arch/x86/kvm/Kconfig |    5 +++++
virt/kvm/kvm_main.c  |    2 ++


diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -33,9 +33,13 @@ config KVM

 	  If unsure, say N.

+config KVM_HAS_PIO
+	bool
+
 config KVM_INTEL
 	tristate "KVM for Intel processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on Intel processors equipped with the VT
 	  extensions.
@@ -43,6 +47,7 @@ config KVM_AMD
 config KVM_AMD
 	tristate "KVM for AMD processors support"
 	depends on KVM
+	select KVM_HAS_PIO
 	---help---
 	  Provides support for KVM on AMD processors equipped with the AMD-V
 	  (SVM) extensions.
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -677,8 +677,10 @@ static int kvm_vcpu_fault(struct vm_area

 	if (vmf->pgoff == 0)
 		page = virt_to_page(vcpu->run);
+#ifdef CONFIG_KVM_HAS_PIO
 	else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
 		page = virt_to_page(vcpu->arch.pio_data);
+#endif /* CONFIG_KVM_HAS_PIO */
 	else
 		return VM_FAULT_SIGBUS;
 	get_page(page);



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This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/