linux-kernel - Re: [PATCH v11 08/20] virt: sev-guest: Consolidate SNP guest messaging parameters to a struct

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Message-ID: <20240904143158.GCZthvXgYmvl0VNZVz@fat_crate.local>
Date: Wed, 4 Sep 2024 16:31:58 +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 v11 08/20] virt: sev-guest: Consolidate SNP guest
 messaging parameters to a struct

On Wed, Jul 31, 2024 at 08:37:59PM +0530, Nikunj A Dadhania wrote:
> +static int handle_guest_request(struct snp_guest_dev *snp_dev, u64 exit_code,
> +				struct snp_guest_request_ioctl *rio, u8 type,
> +				void *req_buf, size_t req_sz, void *resp_buf,
> +				u32 resp_sz)
> +{
> +	struct snp_guest_req req = {
> +		.msg_version	= rio->msg_version,
> +		.msg_type	= type,
> +		.vmpck_id	= vmpck_id,
> +		.req_buf	= req_buf,
> +		.req_sz		= req_sz,
> +		.resp_buf	= resp_buf,
> +		.resp_sz	= resp_sz,
> +		.exit_code	= exit_code,
> +	};
> +
> +	return snp_send_guest_request(snp_dev, &req, rio);
> +}

Right, except you don't need that silly routine copying stuff around either
but simply do the right thing at each call site from the get-go.

using the following coding pattern:

	struct snp_guest_req req = { };

	/* assign all members required for the respective call: */
	req.<member> = ...;
	...

	err = snp_send_guest_request(snp_dev, &req, rio);
	if (err)
		...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette