linux-kernel - Re: [PATCH 07/10] KVM: x86: Add is_vm_type

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Date: Wed, 14 Feb 2024 18:33:58 -0600
From: Michael Roth <michael.roth@....com>
To: Paolo Bonzini <pbonzini@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<seanjc@...gle.com>, <aik@....com>, <isaku.yamahata@...el.com>
Subject: Re: [PATCH 07/10] KVM: x86: Add is_vm_type_supported callback

On Fri, Feb 09, 2024 at 01:37:39PM -0500, Paolo Bonzini wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
> Allow the backend to specify which VM types are supported.
> 
> Based on a patch by Isaku Yamahata <isaku.yamahata@...el.com>.
> 

I think this needs Isaku's SoB since he's still listed as the author.

> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/include/asm/kvm-x86-ops.h | 1 +
>  arch/x86/include/asm/kvm_host.h    | 1 +
>  arch/x86/kvm/x86.c                 | 9 ++++++++-
>  arch/x86/kvm/x86.h                 | 2 ++
>  4 files changed, 12 insertions(+), 1 deletion(-)
> 

..

> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e634e5b67516..c89ddaa1e09f 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -4581,12 +4581,19 @@ static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
>  }
>  #endif
>  
> -static bool kvm_is_vm_type_supported(unsigned long type)
> +bool __kvm_is_vm_type_supported(unsigned long type)
>  {
>  	return type == KVM_X86_DEFAULT_VM ||
>  	       (type == KVM_X86_SW_PROTECTED_VM &&
>  		IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_enabled);
>  }
> +EXPORT_SYMBOL_GPL(__kvm_is_vm_type_supported);

..

> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index 2f7e19166658..4e40c23d66ed 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -9,6 +9,8 @@
>  #include "kvm_cache_regs.h"
>  #include "kvm_emulate.h"
>  
> +bool __kvm_is_vm_type_supported(unsigned long type);

It's not really clear from this patch/commit message why the export is
needed at this stage.

-Mike

> -- 
> 2.39.0
> 
>