[RFC PATCH kernel 12/17] coco/sev-guest: Allow multiple source files in the driver

[Alexey Kardashevskiy <aik@amd.com>]

Prepare for SEV-TIO support as it is going to equal or bigger
than the existing sev_guest.c which is already 700 lines and
keeps growing.

No behavioural change expected.

Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
---
 drivers/virt/coco/sev-guest/Makefile                |  2 +-
 drivers/virt/coco/sev-guest/sev-guest.h             | 16 ++++++++++++++++
 drivers/virt/coco/sev-guest/{sev-guest.c => core.c} | 10 ++--------
 3 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/virt/coco/sev-guest/Makefile b/drivers/virt/coco/sev-guest/Makefile
index 63d67c27723a..a8eb28b6736e 100644
--- a/drivers/virt/coco/sev-guest/Makefile
+++ b/drivers/virt/coco/sev-guest/Makefile
@@ -1,2 +1,2 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_SEV_GUEST) += sev-guest.o
+obj-$(CONFIG_SEV_GUEST) += core.o
diff --git a/drivers/virt/coco/sev-guest/sev-guest.h b/drivers/virt/coco/sev-guest/sev-guest.h
new file mode 100644
index 000000000000..b2a97778e635
--- /dev/null
+++ b/drivers/virt/coco/sev-guest/sev-guest.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __SEV_GUEST_H__
+#define __SEV_GUEST_H__
+
+#include <linux/miscdevice.h>
+#include <asm/sev.h>
+
+struct snp_guest_dev {
+	struct device *dev;
+	struct miscdevice misc;
+
+	struct snp_msg_desc *msg_desc;
+};
+
+#endif /* __SEV_GUEST_H__ */
diff --git a/drivers/virt/coco/sev-guest/sev-guest.c b/drivers/virt/coco/sev-guest/core.c
similarity index 99%
rename from drivers/virt/coco/sev-guest/sev-guest.c
rename to drivers/virt/coco/sev-guest/core.c
index 935537a41469..98f698809720 100644
--- a/drivers/virt/coco/sev-guest/sev-guest.c
+++ b/drivers/virt/coco/sev-guest/core.c
@@ -27,19 +27,13 @@
 #include <uapi/linux/psp-sev.h>
 
 #include <asm/svm.h>
-#include <asm/sev.h>
+
+#include "sev-guest.h"
 
 #define DEVICE_NAME	"sev-guest"
 
 #define SVSM_MAX_RETRIES		3
 
-struct snp_guest_dev {
-	struct device *dev;
-	struct miscdevice misc;
-
-	struct snp_msg_desc *msg_desc;
-};
-
 /*
  * The VMPCK ID represents the key used by the SNP guest to communicate with the
  * SEV firmware in the AMD Secure Processor (ASP, aka PSP). By default, the key
-- 
2.55.0