linux-kernel - [PATCH RFC v8 55/56] x86/sev: Document KVM_SEV_SNP_{G,S}ET

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Message-ID: <20230220183847.59159-56-michael.roth@amd.com>
Date:   Mon, 20 Feb 2023 12:38:46 -0600
From:   Michael Roth <michael.roth@....com>
To:     <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>, <pbonzini@...hat.com>,
        <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>,
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        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <alpergun@...gle.com>, <dgilbert@...hat.com>, <jarkko@...nel.org>,
        <ashish.kalra@....com>, <nikunj.dadhania@....com>,
        Dionna Glaze <dionnaglaze@...gle.com>,
        "Thomas Lendacky" <Thomas.Lendacky@....com>
Subject: [PATCH RFC v8 55/56] x86/sev: Document KVM_SEV_SNP_{G,S}ET_CERTS

From: Dionna Glaze <dionnaglaze@...gle.com>

Update the KVM_MEMORY_ENCRYPT_OP documentation to include the new
commands for overriding the host certificates that the guest receives
from an extended guest request.

Cc: Thomas Lendacky <Thomas.Lendacky@....com>
Cc: Paolo Bonzini <pbonzini@...hat.com>

Signed-off-by: Dionna Glaze <dionnaglaze@...gle.com>
Signed-off-by: Ashish Kalra <ashish.kalra@....com>
Signed-off-by: Michael Roth <michael.roth@....com>
---
 .../virt/kvm/x86/amd-memory-encryption.rst    | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst
index dafb0c9984f1..153003ff2c51 100644
--- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst
+++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst
@@ -537,6 +537,50 @@ Returns: 0 on success, -negative on error
 
 See SEV-SNP specification for further details on launch finish input parameters.
 
+22. KVM_SEV_SNP_GET_CERTS
+-------------------------
+
+After the SNP guest launch flow has started, the KVM_SEV_SNP_GET_CERTS command
+can be issued to request the data that has been installed with the
+KVM_SEV_SNP_SET_CERTS command.
+
+Parameters (in/out): struct kvm_sev_snp_get_certs
+
+Returns: 0 on success, -negative on error
+
+::
+
+	struct kvm_sev_snp_get_certs {
+		__u64 certs_uaddr;
+		__u64 certs_len
+	};
+
+If no certs have been installed, then the return value is -ENOENT.
+If the buffer specified in the struct is too small, the certs_len field will be
+overwritten with the required bytes to receive all the certificate bytes and the
+return value will be -EINVAL.
+
+23. KVM_SEV_SNP_SET_CERTS
+-------------------------
+
+After the SNP guest launch flow has started, the KVM_SEV_SNP_SET_CERTS command
+can be issued to override the /dev/sev certs data that is returned when a
+guest issues an extended guest request. This is useful for instance-specific
+extensions to the host certificates.
+
+Parameters (in/out): struct kvm_sev_snp_set_certs
+
+Returns: 0 on success, -negative on error
+
+::
+
+	struct kvm_sev_snp_set_certs {
+		__u64 certs_uaddr;
+		__u64 certs_len
+	};
+
+The certs_len field may not exceed SEV_FW_BLOB_MAX_SIZE.
+
 References
 ==========
 
-- 
2.25.1