linux-kernel - Re: [PATCH v12 25/29] KVM: SVM: Add module parameter to enable the SEV-SNP

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Message-ID: <abbe9937-7e0f-4fbd-be0b-488de07dd56c@redhat.com>
Date: Sat, 30 Mar 2024 22:35:44 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc: linux-coco@...ts.linux.dev, linux-mm@...ck.org,
 linux-crypto@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
 tglx@...utronix.de, mingo@...hat.com, jroedel@...e.de,
 thomas.lendacky@....com, hpa@...or.com, ardb@...nel.org, seanjc@...gle.com,
 vkuznets@...hat.com, jmattson@...gle.com, luto@...nel.org,
 dave.hansen@...ux.intel.com, slp@...hat.com, pgonda@...gle.com,
 peterz@...radead.org, srinivas.pandruvada@...ux.intel.com,
 rientjes@...gle.com, dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
 vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
 tony.luck@...el.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
 alpergun@...gle.com, jarkko@...nel.org, ashish.kalra@....com,
 nikunj.dadhania@....com, pankaj.gupta@....com, liam.merwick@...cle.com,
 Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v12 25/29] KVM: SVM: Add module parameter to enable the
 SEV-SNP

On 3/29/24 23:58, Michael Roth wrote:
> From: Brijesh Singh <brijesh.singh@....com>
> 
> Add a module parameter than can be used to enable or disable the SEV-SNP
> feature. Now that KVM contains the support for the SNP set the GHCB
> hypervisor feature flag to indicate that SNP is supported.
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> Signed-off-by: Ashish Kalra <ashish.kalra@....com>

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

> ---
>   arch/x86/kvm/svm/sev.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 3e8de7cb3c89..658116537f3f 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -48,7 +48,8 @@ static bool sev_es_enabled = true;
>   module_param_named(sev_es, sev_es_enabled, bool, 0444);
>   
>   /* enable/disable SEV-SNP support */
> -static bool sev_snp_enabled;
> +static bool sev_snp_enabled = true;
> +module_param_named(sev_snp, sev_snp_enabled, bool, 0444);
>   
>   /* enable/disable SEV-ES DebugSwap support */
>   static bool sev_es_debug_swap_enabled = true;