[PATCH] i915: fix DRM_I915_GVT_KVMGT dependencies

[PATCH] i915: fix DRM_I915_GVT_KVMGT dependencies

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

Depending on x86 and KVM is not enough, as the kvm helper functions
that get called here are controlled by CONFIG_KVM_X86, which is
disabled if both KVM_INTEL and KVM_AMD are turned off.

ERROR: modpost: "kvm_write_track_remove_gfn" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
ERROR: modpost: "kvm_page_track_register_notifier" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
ERROR: modpost: "kvm_page_track_unregister_notifier" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
ERROR: modpost: "kvm_write_track_add_gfn" [drivers/gpu/drm/i915/kvmgt.ko] undefined!

Change the dependency to CONFIG_KVM_X86 instead.

Fixes: ea4290d77bda ("KVM: x86: leave kvm.ko out of the build if no vendor module is requested")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/i915/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 46301c06d18a..985cb78d8256 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -118,9 +118,8 @@ config DRM_I915_USERPTR
 config DRM_I915_GVT_KVMGT
 	tristate "Enable KVM host support Intel GVT-g graphics virtualization"
 	depends on DRM_I915
-	depends on X86
+	depends on KVM_X86
 	depends on 64BIT
-	depends on KVM
 	depends on VFIO
 	select DRM_I915_GVT
 	select KVM_EXTERNAL_WRITE_TRACKING
-- 
2.39.5

Re: [PATCH] i915: fix DRM_I915_GVT_KVMGT dependencies

[Sean Christopherson]

On Tue, Oct 15, 2024, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Depending on x86 and KVM is not enough, as the kvm helper functions
> that get called here are controlled by CONFIG_KVM_X86, which is
> disabled if both KVM_INTEL and KVM_AMD are turned off.
> 
> ERROR: modpost: "kvm_write_track_remove_gfn" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
> ERROR: modpost: "kvm_page_track_register_notifier" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
> ERROR: modpost: "kvm_page_track_unregister_notifier" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
> ERROR: modpost: "kvm_write_track_add_gfn" [drivers/gpu/drm/i915/kvmgt.ko] undefined!
> 
> Change the dependency to CONFIG_KVM_X86 instead.
> 
> Fixes: ea4290d77bda ("KVM: x86: leave kvm.ko out of the build if no vendor module is requested")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/drm/i915/Kconfig | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> index 46301c06d18a..985cb78d8256 100644
> --- a/drivers/gpu/drm/i915/Kconfig
> +++ b/drivers/gpu/drm/i915/Kconfig
> @@ -118,9 +118,8 @@ config DRM_I915_USERPTR
>  config DRM_I915_GVT_KVMGT
>  	tristate "Enable KVM host support Intel GVT-g graphics virtualization"
>  	depends on DRM_I915
> -	depends on X86
> +	depends on KVM_X86

Can GVT-g even work on non-Intel CPUs?  I.e. would it make sense to take a
dependency on KVM_INTEL?

>  	depends on 64BIT
> -	depends on KVM
>  	depends on VFIO
>  	select DRM_I915_GVT
>  	select KVM_EXTERNAL_WRITE_TRACKING
> -- 
> 2.39.5
> 

Re: [PATCH] i915: fix DRM_I915_GVT_KVMGT dependencies

[Arnd Bergmann]

On Thu, Oct 17, 2024, at 00:26, Sean Christopherson wrote:
> On Tue, Oct 15, 2024, Arnd Bergmann wrote:
>> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
>> index 46301c06d18a..985cb78d8256 100644
>> --- a/drivers/gpu/drm/i915/Kconfig
>> +++ b/drivers/gpu/drm/i915/Kconfig
>> @@ -118,9 +118,8 @@ config DRM_I915_USERPTR
>>  config DRM_I915_GVT_KVMGT
>>  	tristate "Enable KVM host support Intel GVT-g graphics virtualization"
>>  	depends on DRM_I915
>> -	depends on X86
>> +	depends on KVM_X86
>
> Can GVT-g even work on non-Intel CPUs?  I.e. would it make sense to take a
> dependency on KVM_INTEL?
>

Yes, I think that should work, but I'm not sure if it needs a dependency
on both KVM_INTEL and KVM_X86 in that case, to handle the link-time
dependency in all configurations.

    Arnd

Re: [PATCH] i915: fix DRM_I915_GVT_KVMGT dependencies

[Rodrigo Vivi]

On Thu, Oct 17, 2024 at 05:11:37AM +0000, Arnd Bergmann wrote:
> On Thu, Oct 17, 2024, at 00:26, Sean Christopherson wrote:
> > On Tue, Oct 15, 2024, Arnd Bergmann wrote:
> >> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
> >> index 46301c06d18a..985cb78d8256 100644
> >> --- a/drivers/gpu/drm/i915/Kconfig
> >> +++ b/drivers/gpu/drm/i915/Kconfig
> >> @@ -118,9 +118,8 @@ config DRM_I915_USERPTR
> >>  config DRM_I915_GVT_KVMGT
> >>  	tristate "Enable KVM host support Intel GVT-g graphics virtualization"
> >>  	depends on DRM_I915
> >> -	depends on X86
> >> +	depends on KVM_X86
> >
> > Can GVT-g even work on non-Intel CPUs?  I.e. would it make sense to take a
> > dependency on KVM_INTEL?
> >
> 
> Yes, I think that should work, but I'm not sure if it needs a dependency
> on both KVM_INTEL and KVM_X86 in that case, to handle the link-time
> dependency in all configurations.

not sure as well, but let's take the safest approach. pushed this patch.
Thanks

> 
>     Arnd