linux-kernel - Re: [PATCH v9 06/24] virt: sev-guest: Simplify VMPCK and sequence number assignments

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Message-ID: <24903cd3-f5e1-c770-212b-e46149854792@amd.com>
Date: Wed, 19 Jun 2024 10:12:00 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: "Nikunj A. Dadhania" <nikunj@....com>, linux-kernel@...r.kernel.org,
 bp@...en8.de, x86@...nel.org, kvm@...r.kernel.org
Cc: mingo@...hat.com, tglx@...utronix.de, dave.hansen@...ux.intel.com,
 pgonda@...gle.com, seanjc@...gle.com, pbonzini@...hat.com
Subject: Re: [PATCH v9 06/24] virt: sev-guest: Simplify VMPCK and sequence
 number assignments

On 6/19/24 01:06, Nikunj A. Dadhania wrote:
> On 6/19/2024 2:57 AM, Tom Lendacky wrote:
>> On 5/30/24 23:30, Nikunj A Dadhania wrote:

> 
> I have separated patch 6 and 7 for better code review and modular changes.
> 
> The next patch simplifes this further to:
> 
> static inline u8 *get_vmpck(struct snp_guest_dev *snp_dev)
> {
> 	return snp_dev->secrets->vmpck[snp_dev->vmpck_id];
> }
> 
> static bool assign_vmpck(struct snp_guest_dev *dev, unsigned int vmpck_id)
> {
> 	if ((vmpck_id + 1) > VMPCK_MAX_NUM)

Ok, this still has the "+ 1" thing (and it should be >=, right?). How about:

	if (!(vmpck_id < VMPCK_MAX_NUM))
		return false;

Just makes it easier to read for me, but if no one else has an issue,
don't worry about it.

Thanks,
Tom

> 		return false;
> 
> 	dev->vmpck_id = vmpck_id;
> 
> 	return true;
> }
> 
> 
> Regards
> Nikunj