linux-kernel - Re: [PATCH v8 08/16] x86/mm: Add generic guest initialization hook

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Message-ID: <20240422132058.GBZiZkOqU0zFviMzoC@fat_crate.local>
Date: Mon, 22 Apr 2024 15:20:58 +0200
From: Borislav Petkov <bp@...en8.de>
To: Nikunj A Dadhania <nikunj@....com>
Cc: linux-kernel@...r.kernel.org, thomas.lendacky@....com, x86@...nel.org,
	kvm@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	dave.hansen@...ux.intel.com, pgonda@...gle.com, seanjc@...gle.com,
	pbonzini@...hat.com
Subject: Re: [PATCH v8 08/16] x86/mm: Add generic guest initialization hook

On Thu, Feb 15, 2024 at 05:01:20PM +0530, Nikunj A Dadhania wrote:
> diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
> index d035bce3a2b0..68aa06852466 100644
> --- a/arch/x86/mm/mem_encrypt.c
> +++ b/arch/x86/mm/mem_encrypt.c
> @@ -89,6 +89,8 @@ void __init mem_encrypt_init(void)
>  	/* Call into SWIOTLB to update the SWIOTLB DMA buffers */
>  	swiotlb_update_mem_attributes();
>  
> +	x86_platform.guest.enc_init();
> +
>  	print_mem_encrypt_feature_info();

Why all this hoopla if all you need is to call it once in mem_encrypt.c?

IOW, you can simply call snp_secure_tsc_prepare() there, no?

Those function pointers are to be used in generic code in order to hide
all the platform-specific hackery but mem_encrypt.c is not really
generic code, I'd say...

-- 
Regards/Gruss,
    Boris.

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