linux-kernel - Re: [Part2 PATCH v5 17/31] KVM: SVM: Add KVM_SEV

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Date:   Sat, 14 Oct 2017 11:21:39 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [Part2 PATCH v5 17/31] KVM: SVM: Add KVM_SEV_INIT command

On Wed, Oct 04, 2017 at 08:13:58AM -0500, Brijesh Singh wrote:
> The command initializes the SEV platform context and allocates a new ASID
> for this guest from the SEV ASID pool. The firmware must be initialized
> before we issue any guest launch commands to create a new memory encryption
> context.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: "Radim Krčmář" <rkrcmar@...hat.com>
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: x86@...nel.org
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/include/asm/kvm_host.h |   7 ++
>  arch/x86/kvm/svm.c              | 189 +++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 195 insertions(+), 1 deletion(-)

Just minor cleanups. With those applied:

Reviewed-by: Borislav Petkov <bp@...e.de>

---
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 26380627e7f9..7b3b199e15a1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1189,8 +1189,8 @@ static __init int svm_hardware_setup(void)
 
 static int sev_platform_get_state(int *state, int *error)
 {
-	int ret;
 	struct sev_data_status *data;
+	int ret;
 
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
@@ -1201,7 +1201,7 @@ static int sev_platform_get_state(int *state, int *error)
 		*state = data->state;
 
 	pr_info_once("SEV firmware major %d minor %d build %d\n",
-			data->api_major, data->api_minor, data->build);
+		     data->api_major, data->api_minor, data->build);
 
 	kfree(data);
 	return ret;
@@ -5577,6 +5577,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
 
 	sev->active = true;
 	sev->asid = asid;
+
 	return 0;
 
 e_shutdown:
@@ -5598,17 +5599,19 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
 	mutex_lock(&kvm->lock);
 
 	switch (sev_cmd.id) {
-	case KVM_SEV_INIT: {
+	case KVM_SEV_INIT:
 		r = sev_guest_init(kvm, &sev_cmd);
 		break;
-	}
+
 	default:
 		break;
 	}
 
 	mutex_unlock(&kvm->lock);
+
 	if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd)))
 		r = -EFAULT;
+
 	return r;
 }
 

-- 
Regards/Gruss,
    Boris.

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