linux-kernel - Re: [Part2 PATCH v4.1 07/29] crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support

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Date:   Wed, 4 Oct 2017 12:07:49 +0200
From:   Borislav Petkov <bp@...e.de>
To:     P J P <ppandit@...hat.com>, Brijesh Singh <brijesh.singh@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Gary Hook <gary.hook@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-crypto@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Part2 PATCH v4.1 07/29] crypto: ccp: Add Secure Encrypted
 Virtualization (SEV) command support

On Wed, Oct 04, 2017 at 03:24:36PM +0530, P J P wrote:
> It appears to cross 80 columns limit, checkpatch.pl throws warnings. Adding 
> new line would be consistent with coding style.

The 80 cols rule is not a hard one and checkpatch should not override
common sense. This is a function which maps commands to buffer lengths
and it should be obvious at a *very* quick glance what it does. And that
is best done if it is written in a tabular manner as we do such things
in other places in the kernel too.

Btw, Brijesh, please space out those statements for even better
readability:

static int sev_cmd_buffer_len(int cmd)
{
       switch (cmd) {
       case SEV_CMD_INIT:			return sizeof(struct sev_data_init);
       case SEV_CMD_PLATFORM_STATUS:		return sizeof(struct sev_data_status);
       case SEV_CMD_PEK_CSR:           		return sizeof(struct sev_data_pek_csr);
       case SEV_CMD_PEK_CERT_IMPORT:   		return sizeof(struct sev_data_pek_cert_import);
       case SEV_CMD_PDH_CERT_EXPORT:   		return sizeof(struct sev_data_pdh_cert_export);
       case SEV_CMD_LAUNCH_START:      		return sizeof(struct sev_data_launch_start);
       case SEV_CMD_LAUNCH_UPDATE_DATA:		return sizeof(struct sev_data_launch_update_data);
       case SEV_CMD_LAUNCH_UPDATE_VMSA:		return sizeof(struct sev_data_launch_update_vmsa);
       case SEV_CMD_LAUNCH_FINISH:     		return sizeof(struct sev_data_launch_finish);
       case SEV_CMD_LAUNCH_MEASURE:    		return sizeof(struct sev_data_launch_measure);
       case SEV_CMD_ACTIVATE:          		return sizeof(struct sev_data_activate);
       case SEV_CMD_DEACTIVATE:        		return sizeof(struct sev_data_deactivate);
       case SEV_CMD_DECOMMISSION:      		return sizeof(struct sev_data_decommission);
       case SEV_CMD_GUEST_STATUS:      		return sizeof(struct sev_data_guest_status);
       case SEV_CMD_DBG_DECRYPT:       		return sizeof(struct sev_data_dbg);
       case SEV_CMD_DBG_ENCRYPT:		return sizeof(struct sev_data_dbg);
       case SEV_CMD_SEND_START:			return sizeof(struct sev_data_send_start);
       case SEV_CMD_SEND_UPDATE_DATA:		return sizeof(struct sev_data_send_update_data);
       case SEV_CMD_SEND_UPDATE_VMSA:		return sizeof(struct sev_data_send_update_vmsa);
       case SEV_CMD_SEND_FINISH:		return sizeof(struct sev_data_send_finish);
       case SEV_CMD_RECEIVE_START:		return sizeof(struct sev_data_receive_start);
       case SEV_CMD_RECEIVE_FINISH:    		return sizeof(struct sev_data_receive_finish);
       case SEV_CMD_RECEIVE_UPDATE_DATA:	return sizeof(struct sev_data_receive_update_data);
       case SEV_CMD_RECEIVE_UPDATE_VMSA:	return sizeof(struct sev_data_receive_update_vmsa);
       case SEV_CMD_LAUNCH_UPDATE_SECRET:	return sizeof(struct sev_data_launch_secret);
       default:                        		return 0;
       }

       return 0;
}

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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