linux-kernel - Re: [PATCH 1/9] x86/hyperv: Add sev-snp enlightened guest static key

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Message-ID: <ff8a3cea-10a2-1f27-d5eb-4c93d9992c5f@gmail.com>
Date:   Tue, 18 Jul 2023 13:52:16 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Tianyu Lan <tiala@...rosoft.com>, linux-arch@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, daniel.lezcano@...aro.org, arnd@...db.de,
        michael.h.kelley@...rosoft.com
Subject: Re: [PATCH 1/9] x86/hyperv: Add sev-snp enlightened guest static key

On 6/5/2023 8:09 PM, Vitaly Kuznetsov wrote:
> Tianyu Lan <ltykernel@...il.com> writes:
>>   int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
>> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
>> index c7969e806c64..9186453251f7 100644
>> --- a/arch/x86/kernel/cpu/mshyperv.c
>> +++ b/arch/x86/kernel/cpu/mshyperv.c
>> @@ -402,8 +402,12 @@ static void __init ms_hyperv_init_platform(void)
>>   		pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n",
>>   			ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b);
>>   
>> -		if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP)
>> +
>> +		if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) {
>> +			static_branch_enable(&isolation_type_en_snp);
>> +		} else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) {
>>   			static_branch_enable(&isolation_type_snp);
> 
> Nitpick: In case 'isolation_type_snp' and 'isolation_type_en_snp' are
> mutually exclusive, I'd suggest we rename the former: it is quite
> un-intuitive that for an enlightened SNP guest '&isolation_type_snp' is
> NOT enabled. E.g. we can use
> 
> 'isol_type_snp_paravisor'
> and
> 'isol_type_snp_enlightened'
> 
> (I also don't like 'isolation_type_en_snp' name as 'en' normally stands
> for 'enabled')
> 

Hi Vitaly:
	I will do such rename the function in the following patchset and this 
will not affect SEV-SNP function.