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        Michael Roth <michael.roth@amd.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Andi Kleen <ak@linux.intel.com>, tony.luck@intel.com,
        marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com,
        Brijesh Singh <brijesh.singh@amd.com>
Subject: [PATCH Part2 v5 18/45] crypto: ccp: Provide APIs to query extended attestation report
Date:   Fri, 20 Aug 2021 10:58:51 -0500
Message-Id: <20210820155918.7518-19-brijesh.singh@amd.com>
In-Reply-To: <20210820155918.7518-1-brijesh.singh@amd.com>
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Version 2 of the GHCB specification defines VMGEXIT that is used to get
the extended attestation report. The extended attestation report includes
the certificate blobs provided through the SNP_SET_EXT_CONFIG.

The snp_guest_ext_guest_request() will be used by the hypervisor to get
the extended attestation report. See the GHCB specification for more
details.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 drivers/crypto/ccp/sev-dev.c | 43 ++++++++++++++++++++++++++++++++++++
 include/linux/psp-sev.h      | 24 ++++++++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 9ba194acbe85..e2650c3d0d0a 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -22,6 +22,7 @@
 #include <linux/firmware.h>
 #include <linux/gfp.h>
 #include <linux/cpufeature.h>
+#include <linux/sev-guest.h>
 
 #include <asm/smp.h>
 
@@ -1677,6 +1678,48 @@ int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error)
 }
 EXPORT_SYMBOL_GPL(snp_guest_dbg_decrypt);
 
+int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data,
+				unsigned long vaddr, unsigned long *npages, unsigned long *fw_err)
+{
+	unsigned long expected_npages;
+	struct sev_device *sev;
+	int rc;
+
+	if (!psp_master || !psp_master->sev_data)
+		return -ENODEV;
+
+	sev = psp_master->sev_data;
+
+	if (!sev->snp_inited)
+		return -EINVAL;
+
+	/*
+	 * Check if there is enough space to copy the certificate chain. Otherwise
+	 * return ERROR code defined in the GHCB specification.
+	 */
+	expected_npages = sev->snp_certs_len >> PAGE_SHIFT;
+	if (*npages < expected_npages) {
+		*npages = expected_npages;
+		*fw_err = SNP_GUEST_REQ_INVALID_LEN;
+		return -EINVAL;
+	}
+
+	rc = sev_do_cmd(SEV_CMD_SNP_GUEST_REQUEST, data, (int *)&fw_err);
+	if (rc)
+		return rc;
+
+	/* Copy the certificate blob */
+	if (sev->snp_certs_data) {
+		*npages = expected_npages;
+		memcpy((void *)vaddr, sev->snp_certs_data, *npages << PAGE_SHIFT);
+	} else {
+		*npages = 0;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(snp_guest_ext_guest_request);
+
 static void sev_exit(struct kref *ref)
 {
 	misc_deregister(&misc_dev->misc);
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index 00bd684dc094..ea94ce4d834a 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -924,6 +924,23 @@ void *psp_copy_user_blob(u64 uaddr, u32 len);
 void *snp_alloc_firmware_page(gfp_t mask);
 void snp_free_firmware_page(void *addr);
 
+/**
+ * snp_guest_ext_guest_request - perform the SNP extended guest request command
+ *  defined in the GHCB specification.
+ *
+ * @data: the input guest request structure
+ * @vaddr: address where the certificate blob need to be copied.
+ * @npages: number of pages for the certificate blob.
+ *    If the specified page count is less than the certificate blob size, then the
+ *    required page count is returned with error code defined in the GHCB spec.
+ *    If the specified page count is more than the certificate blob size, then
+ *    page count is updated to reflect the amount of valid data copied in the
+ *    vaddr.
+ */
+int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data,
+				unsigned long vaddr, unsigned long *npages,
+				unsigned long *error);
+
 #else	/* !CONFIG_CRYPTO_DEV_SP_PSP */
 
 static inline int
@@ -971,6 +988,13 @@ static inline void *snp_alloc_firmware_page(gfp_t mask)
 
 static inline void snp_free_firmware_page(void *addr) { }
 
+static inline int snp_guest_ext_guest_request(struct sev_data_snp_guest_request *data,
+					      unsigned long vaddr, unsigned long *n,
+					      unsigned long *error)
+{
+	return -ENODEV;
+}
+
 #endif	/* CONFIG_CRYPTO_DEV_SP_PSP */
 
 #endif	/* __PSP_SEV_H__ */
-- 
2.17.1