linux-kernel - Re: [PATCH v6 07/16] x86/sev: Move and reorganize sev guest request api

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Date:   Wed, 6 Dec 2023 09:54:03 +0530
From:   "Nikunj A. Dadhania" <nikunj@....com>
To:     Dionna Amalie Glaze <dionnaglaze@...gle.com>
Cc:     linux-kernel@...r.kernel.org, thomas.lendacky@....com,
        x86@...nel.org, kvm@...r.kernel.org, bp@...en8.de,
        mingo@...hat.com, tglx@...utronix.de, dave.hansen@...ux.intel.com,
        pgonda@...gle.com, seanjc@...gle.com, pbonzini@...hat.com
Subject: Re: [PATCH v6 07/16] x86/sev: Move and reorganize sev guest request
 api

On 12/5/2023 10:43 PM, Dionna Amalie Glaze wrote:
> On Tue, Nov 28, 2023 at 5:01 AM Nikunj A Dadhania <nikunj@....com> wrote:
>>
>> +int snp_setup_psp_messaging(struct snp_guest_dev *snp_dev)
>> +{
>> +       struct sev_guest_platform_data *pdata;
>> +       int ret;
>> +
>> +       if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) {
> 
> Note that this may be going away in favor of an
> cpu_feature_enabled(X86_FEATURE_...) check given Kirill's "[PATCH]
> x86/coco, x86/sev: Use cpu_feature_enabled() to detect SEV guest
> flavor"

I do not see a conclusion on that yet, so we should wait.

>> +bool snp_assign_vmpck(struct snp_guest_dev *dev, unsigned int vmpck_id)
>> +{
>> +       if (WARN_ON(vmpck_id > 3))
> 
> This constant 3 should be #define'd, I believe.

Sure, I am working on few changes related to mutex per vmpck that Tom had suggested offline, that will also need a #define.

Thanks
Nikunj