[PATCH v4 3/9] x86/sev: Set GHCB data structure version

[Vasant Karasulli]

From: Joerg Roedel <jroedel@xxxxxxx>

It turned out that the GHCB->protocol field does not declare the
version of the guest-hypervisor communication protocol, but rather the
version of the GHCB data structure. Reflect that in the define used to
set the protocol field.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Vasant Karasulli <vkarasulli@xxxxxxx>
---
 arch/x86/include/asm/sev.h   | 3 +++
 arch/x86/kernel/sev-shared.c | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index 5b4a1ce3d368..c48db0bfb707 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -20,6 +20,9 @@
 #define GHCB_PROTOCOL_MAX	2ULL
 #define GHCB_DEFAULT_USAGE	0ULL

+/* Version of the GHCB data structure */
+#define GHCB_VERSION		1
+
 #define	VMGEXIT()			{ asm volatile("rep; vmmcall\n\r"); }

 enum es_result {
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index c02a087c7945..6adae48c501f 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -257,7 +257,7 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb,
 					  u64 exit_info_2)
 {
 	/* Fill in protocol and format specifiers */
-	ghcb->protocol_version = ghcb_version;
+	ghcb->protocol_version = GHCB_VERSION;
 	ghcb->ghcb_usage       = GHCB_DEFAULT_USAGE;

 	ghcb_set_sw_exit_code(ghcb, exit_code);
--
2.34.1