From: Peter Gonda <pgonda@google.com>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>, "Borislav Petkov" <bp@suse.de>,
"Lendacky, Thomas" <Thomas.Lendacky@amd.com>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 01/11] KVM: SVM: Add KVM_SEV SEND_START command
Date: Thu, 14 Nov 2019 11:27:38 -0800 [thread overview]
Message-ID: <CAMkAt6qfPyqGuNv9gKirote=zj6Vha=9Vu1HSFkxx334s-GV1g@mail.gmail.com> (raw)
In-Reply-To: <4f509f43-a576-144d-efd4-ab0362f1d667@amd.com>
On Tue, Nov 12, 2019 at 2:27 PM Brijesh Singh <brijesh.singh@amd.com> wrote:
>
>
> On 11/12/19 12:35 PM, Peter Gonda wrote:
> > On Wed, Jul 10, 2019 at 1:13 PM Singh, Brijesh <brijesh.singh@amd.com> wrote:
> >> +static int sev_send_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
> >> +{
> >> + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
> >> + void *amd_cert = NULL, *session_data = NULL;
> >> + void *pdh_cert = NULL, *plat_cert = NULL;
> >> + struct sev_data_send_start *data = NULL;
> >> + struct kvm_sev_send_start params;
> >> + int ret;
> >> +
> >> + if (!sev_guest(kvm))
> >> + return -ENOTTY;
> >> +
> >> + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
> >> + sizeof(struct kvm_sev_send_start)))
> >> + return -EFAULT;
> >> +
> >> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> >> + if (!data)
> >> + return -ENOMEM;
> >> +
> >> + /* userspace wants to query the session length */
> >> + if (!params.session_len)
> >> + goto cmd;
> >> +
> >> + if (!params.pdh_cert_uaddr || !params.pdh_cert_len ||
> >> + !params.session_uaddr)
> >> + return -EINVAL;
> > I think pdh_cert is only required if the guest policy SEV bit is set.
> > Can pdh_cert be optional?
>
>
> We don't cache the policy information in kernel, having said so we can
> try caching it during the LAUNCH_START to optimize this case. I have to
> check with FW folks but I believe all those fields are required. IIRC,
> When I passed NULL then SEND_START failed for me. But I double check it
> and update you on this.
I must have misinterpreted the this line of the spec:
"If GCTX.POLICY.SEV is 1, the PDH, PEK, CEK, ASK, and ARK certificates
are validated."
I thought that since they were not validated they were not needed.
next prev parent reply other threads:[~2019-11-14 19:27 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190710201244.25195-1-brijesh.singh@amd.com>
2019-07-10 20:13 ` [PATCH v3 01/11] KVM: SVM: Add KVM_SEV SEND_START command Singh, Brijesh
2019-08-22 10:08 ` Borislav Petkov
2019-08-22 13:23 ` Singh, Brijesh
2019-11-12 18:35 ` Peter Gonda
2019-11-12 22:27 ` Brijesh Singh
2019-11-14 19:27 ` Peter Gonda [this message]
2019-11-19 14:06 ` Brijesh Singh
2019-07-10 20:13 ` [PATCH v3 02/11] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Singh, Brijesh
2019-08-22 12:02 ` Borislav Petkov
2019-08-22 13:27 ` Singh, Brijesh
2019-08-22 13:34 ` Borislav Petkov
2019-11-12 22:23 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 03/11] KVM: SVM: Add KVM_SEV_SEND_FINISH command Singh, Brijesh
2019-08-26 13:29 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 04/11] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Singh, Brijesh
2019-07-10 20:13 ` [PATCH v3 05/11] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Singh, Brijesh
2019-08-27 12:09 ` Borislav Petkov
2019-11-14 21:02 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 06/11] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Singh, Brijesh
2019-08-27 12:19 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 07/11] KVM: x86: Add AMD SEV specific Hypercall3 Singh, Brijesh
2019-07-10 20:13 ` [PATCH v3 08/11] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Singh, Brijesh
2019-07-21 20:57 ` David Rientjes
2019-07-22 17:12 ` Cfir Cohen
2019-07-23 15:31 ` Singh, Brijesh
2019-07-23 15:16 ` Singh, Brijesh
2019-11-25 19:07 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 09/11] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Singh, Brijesh
2019-08-29 16:26 ` Borislav Petkov
2019-08-29 16:41 ` Singh, Brijesh
2019-08-29 16:56 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 10/11] mm: x86: Invoke hypercall when page encryption status is changed Singh, Brijesh
2019-08-29 16:52 ` Borislav Petkov
2019-08-29 18:07 ` Borislav Petkov
2019-08-29 18:21 ` Thomas Gleixner
2019-08-29 18:32 ` Thomas Gleixner
2019-07-10 20:13 ` [PATCH v3 11/11] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Singh, Brijesh
2019-11-15 1:22 ` Steve Rutherford
2019-11-15 1:39 ` Steve Rutherford
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