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Date: Tue, 13 Dec 2022 17:58:40 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
"luto@...nel.org" <luto@...nel.org>,
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"pbonzini@...hat.com" <pbonzini@...hat.com>,
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Tianyu Lan <Tianyu.Lan@...rosoft.com>,
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Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [RFC PATCH V2 02/18] x86/hyperv: Add sev-snp enlightened guest
specific config
On 12/13/2022 1:56 AM, Michael Kelley (LINUX) wrote:
>> @@ -32,6 +33,7 @@ extern u64 hv_current_partition_id;
>>
>> extern union hv_ghcb * __percpu *hv_ghcb_pg;
>>
>> +extern bool hv_isolation_type_en_snp(void);
> This file also has a declaration for hv_isolation_type_snp(). I
> think this new declaration is near the beginning of this file so
> that it can be referenced by hv_do_hypercall() and related
> functions in Patch 6 of this series. So maybe move the
> declaration of hv_isolation_type_snp() up so it is adjacent
> to this one? It would make sense for the two to be together.
Agree. Will update in the next version.
>
>> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
>> index 831613959a92..2ea4f21c6172 100644
>> --- a/arch/x86/kernel/cpu/mshyperv.c
>> +++ b/arch/x86/kernel/cpu/mshyperv.c
>> @@ -273,6 +273,21 @@ static void __init ms_hyperv_init_platform(void)
>> ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
>> ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
>>
>> + /*
>> + * Add custom configuration for SEV-SNP Enlightened guest
>> + */
>> + if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) {
>> + ms_hyperv.features |= HV_ACCESS_FREQUENCY_MSRS;
>> + ms_hyperv.misc_features |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
>> + ms_hyperv.misc_features &= ~HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
>> + ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED;
>> + ms_hyperv.hints |= HV_X64_APIC_ACCESS_RECOMMENDED;
>> + ms_hyperv.hints |= HV_X64_CLUSTER_IPI_RECOMMENDED;
>> + }
>> +
>> + pr_info("Hyper-V: enlightment features 0x%x, hints 0x%x, misc 0x%x\n",
>> + ms_hyperv.features, ms_hyperv.hints, ms_hyperv.misc_features);
>> +
> What's the reason for this additional call to pr_info()? There's a call to pr_info()
> a couple of lines below that displays the same information, and a little bit more.
> It seems like the above call should be deleted, as I think we should try to be as
> consistent as possible in the output.
Sorry for noise. This one should be redundant. Will remove in the next
version.
>
>> @@ -328,18 +343,22 @@ static void __init ms_hyperv_init_platform(void)
>> ms_hyperv.shared_gpa_boundary =
>> BIT_ULL(ms_hyperv.shared_gpa_boundary_bits);
>>
>> - 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);
>> #ifdef CONFIG_SWIOTLB
>> swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary;
>> #endif
>> }
>> +
>> + 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);
>> +
> Is there a reason for moving this pr_info() down a few lines? I can't see that the
> intervening code changes any of the settings that are displayed, so it should be
> good in the original location. Just trying to minimize changes that don't add value ...
>
Agree. Will keep previous order. Thanks.
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