crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support

AMD's new Secure Encrypted Virtualization (SEV) feature allows the
memory contents of virtual machines to be transparently encrypted with a
key unique to the VM. The programming and management of the encryption
keys are handled by the AMD Secure Processor (AMD-SP) which exposes the
commands for these tasks. The complete spec is available at:

http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf

Extend the AMD-SP driver to provide the following support:

 - an in-kernel API to communicate with the SEV firmware. The API can be
   used by the hypervisor to create encryption context for a SEV guest.

 - a userspace IOCTL to manage the platform certificates.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-crypto@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Improvements-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h
index 55b7808367c3..c81f0b11287a 100644
--- a/drivers/crypto/ccp/psp-dev.h
+++ b/drivers/crypto/ccp/psp-dev.h
@@ -25,9 +25,21 @@
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
 #include <linux/dmaengine.h>
+#include <linux/psp-sev.h>
+#include <linux/miscdevice.h>
 
 #include "sp-dev.h"
 
+#define PSP_C2PMSG(_num)		((_num) << 2)
+#define PSP_CMDRESP			PSP_C2PMSG(32)
+#define PSP_CMDBUFF_ADDR_LO		PSP_C2PMSG(56)
+#define PSP_CMDBUFF_ADDR_HI             PSP_C2PMSG(57)
+#define PSP_FEATURE_REG			PSP_C2PMSG(63)
+
+#define PSP_P2CMSG(_num)		((_num) << 2)
+#define PSP_CMD_COMPLETE_REG		1
+#define PSP_CMD_COMPLETE		PSP_P2CMSG(PSP_CMD_COMPLETE_REG)
+
 #define PSP_P2CMSG_INTEN		0x0110
 #define PSP_P2CMSG_INTSTS		0x0114
 
@@ -44,6 +56,11 @@
 
 #define MAX_PSP_NAME_LEN		16
 
+struct sev_misc_dev {
+	struct kref refcount;
+	struct miscdevice misc;
+};
+
 struct psp_device {
 	struct list_head entry;
 
@@ -54,6 +71,13 @@ struct psp_device {
 	struct sp_device *sp;
 
 	void __iomem *io_regs;
+
+	int sev_state;
+	unsigned int sev_int_rcvd;
+	wait_queue_head_t sev_int_queue;
+	struct sev_misc_dev *sev_misc;
+	struct sev_user_data_status status_cmd_buf;
+	struct sev_data_init init_cmd_buf;
 };
 
 #endif /* __PSP_DEV_H */