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Subject: Re: [PATCH v2 8/8] KVM: SVM: Allocate SEV command structures on local
 stack
To:     Borislav Petkov <bp@suse.de>,
        Sean Christopherson <seanjc@google.com>
Cc:     Christophe Leroy <christophe.leroy@csgroup.eu>,
        Brijesh Singh <brijesh.singh@amd.com>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        John Allen <john.allen@amd.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, kvm@vger.kernel.org,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20210406224952.4177376-1-seanjc@google.com>
 <20210406224952.4177376-9-seanjc@google.com>
 <9df3b755-d71a-bfdf-8bee-f2cd2883ea2f@csgroup.eu>
 <20210407102440.GA25732@zn.tnic> <YG3mQ+U6ZnoWIZ9a@google.com>
 <20210407173407.GB25732@zn.tnic>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <32b9a108-c7f8-885b-9cee-783d63aea794@redhat.com>
Date:   Sat, 17 Apr 2021 14:45:47 +0200
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On 07/04/21 19:34, Borislav Petkov wrote:
> On Wed, Apr 07, 2021 at 05:05:07PM +0000, Sean Christopherson wrote:
>> I used memset() to defer initialization until after the various sanity
>> checks,
> 
> I'd actually vote for that too - I don't like doing stuff which is not
> going to be used. I.e., don't change what you have.

It's three votes for that then. :)

Sean, I squashed in this change

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index ec4c01807272..a4d0ca8c4710 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1039,21 +1039,14 @@ static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
  static int sev_send_cancel(struct kvm *kvm, struct kvm_sev_cmd *argp)
  {
  	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
-	struct sev_data_send_cancel *data;
+	struct sev_data_send_cancel data;
  	int ret;
  
  	if (!sev_guest(kvm))
  		return -ENOTTY;
  
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	data->handle = sev->handle;
-	ret = sev_issue_cmd(kvm, SEV_CMD_SEND_CANCEL, data, &argp->error);
-
-	kfree(data);
-	return ret;
+	data.handle = sev->handle;
+	return sev_issue_cmd(kvm, SEV_CMD_SEND_CANCEL, &data, &argp->error);
  }
  
  int svm_mem_enc_op(struct kvm *kvm, void __user *argp)

to handle SV_CMD_SEND_CANCEL which I merged before this series.

Paolo