linux-kernel - [PATCH v5 03/10] x86/sev: Set GHCB data structure version

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Date: Mon,  8 Apr 2024 09:40:42 +0200
From: vsntk18@...il.com
To: x86@...nel.org
Cc: cfir@...gle.com,
	dan.j.williams@...el.com,
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Subject: [PATCH v5 03/10] x86/sev: Set GHCB data structure version

From: Joerg Roedel <jroedel@...e.de>

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@...e.de>
Signed-off-by: Vasant Karasulli <vkarasulli@...e.de>
---
 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 07e125f32528..829650bdd455 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -19,6 +19,9 @@
 #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"); }
 
 struct boot_params;
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index ba51005ddde2..fb62e1582703 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -264,7 +264,7 @@ 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