linux-kernel - Re: [PATCH] KVM: SVM: fix compilation with modular PSP and non-modular KVM

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Message-ID: <20200413233047.GJ21204@linux.intel.com>
Date:   Mon, 13 Apr 2020 16:30:47 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        ubizjak@...il.com
Subject: Re: [PATCH] KVM: SVM: fix compilation with modular PSP and
 non-modular KVM

On Mon, Apr 13, 2020 at 03:50:31AM -0400, Paolo Bonzini wrote:
> Use svm_sev_enabled() in order to cull all calls to PSP code.  Otherwise,
> compilation fails with undefined symbols if the PSP device driver is compiled
> as a module and KVM is not.
> 
> Reported-by: Uros Bizjak <ubizjak@...il.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/svm/sev.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 0e3fc311d7da..364ffe32139c 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -1117,7 +1117,7 @@ int __init sev_hardware_setup(void)
>  	/* Maximum number of encrypted guests supported simultaneously */
>  	max_sev_asid = cpuid_ecx(0x8000001F);
>  
> -	if (!max_sev_asid)
> +        if (!svm_sev_enabled())
>  		return 1;
>  
>  	/* Minimum ASID value that should be used for SEV guest */
> @@ -1156,6 +1156,9 @@ int __init sev_hardware_setup(void)
>  
>  void sev_hardware_teardown(void)
>  {
> +        if (!svm_sev_enabled())
> +                return;
> +

Tabs instead of spaces.  Checkpatch also whinges about going past 75 chars
in the changelog.

>  	bitmap_free(sev_asid_bitmap);
>  	bitmap_free(sev_reclaim_asid_bitmap);
>  
> -- 
> 2.18.2
>