linux-kernel - Re: [Part2 PATCH v7 25/38] KVM: SVM: Add KVM_SEV

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Date:   Mon, 6 Nov 2017 11:57:37 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     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>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org
Subject: Re: [Part2 PATCH v7 25/38] KVM: SVM: Add KVM_SEV_INIT command

On Wed, Nov 01, 2017 at 04:16:10PM -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              | 130 +++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 136 insertions(+), 1 deletion(-)

...

> @@ -1167,10 +1187,18 @@ static __init int svm_hardware_setup(void)
>  	return r;
>  }
>  
> +static __exit void sev_hardware_unsetup(void)
> +{
> +	if (svm_sev_enabled())
> +		kfree(sev_asid_bitmap);
> +}

Just get rid of that silly function:

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1410e6b7e8d8..5f5c3ddad139 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1187,17 +1187,12 @@ static __init int svm_hardware_setup(void)
 	return r;
 }
 
-static __exit void sev_hardware_unsetup(void)
-{
-	if (svm_sev_enabled())
-		kfree(sev_asid_bitmap);
-}
-
 static __exit void svm_hardware_unsetup(void)
 {
 	int cpu;
 
-	sev_hardware_unsetup();
+	if (svm_sev_enabled())
+		kfree(sev_asid_bitmap);
 
 	for_each_possible_cpu(cpu)
 		svm_cpu_uninit(cpu);

with that:

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

-- 
Regards/Gruss,
    Boris.

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