linux-kernel - [PATCH] x86/hyperv: Export hv_hypercall

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Message-Id: <20250825055208.238729-1-namjain@linux.microsoft.com>
Date: Mon, 25 Aug 2025 11:22:08 +0530
From: Naman Jain <namjain@...ux.microsoft.com>
To: "K . Y . Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>
Cc: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] x86/hyperv: Export hv_hypercall_pg unconditionally

With commit 0e20f1f4c2cb ("x86/hyperv: Clean up hv_do_hypercall()"),
config checks were added to conditionally restrict export
of hv_hypercall_pg symbol at the same time when a usage of that symbol
was added in mshv_vtl_main.c driver. This results in missing symbol
warning when mshv_vtl_main is compiled. Change the logic to
export it unconditionally.

Fixes: 96a1d2495c2f ("Drivers: hv: Introduce mshv_vtl driver")
Signed-off-by: Naman Jain <namjain@...ux.microsoft.com>
---
Omitted cc:stable tag, since mshv_vtl_main changes have not yet
landed in stable/rc kernels. I can add if required.
---
 arch/x86/hyperv/hv_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 896e2913bc41..0ba9cae9ffaf 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -36,6 +36,7 @@
 #include <linux/export.h>
 
 void *hv_hypercall_pg;
+EXPORT_SYMBOL_GPL(hv_hypercall_pg);
 
 #ifdef CONFIG_X86_64
 static u64 __hv_hyperfail(u64 control, u64 param1, u64 param2)
@@ -73,7 +74,6 @@ static inline void hv_set_hypercall_pg(void *ptr)
 {
 	hv_hypercall_pg = ptr;
 }
-EXPORT_SYMBOL_GPL(hv_hypercall_pg);
 #endif
 
 union hv_ghcb * __percpu *hv_ghcb_pg;
-- 
2.34.1