linux-kernel - [PATCH v9 1/2] Drivers: hv: Export some symbols for mshv

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Message-ID: <20251017074507.142704-2-namjain@linux.microsoft.com>
Date: Fri, 17 Oct 2025 07:45:06 +0000
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>,
	"H . Peter Anvin" <hpa@...or.com>
Cc: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Mukesh Rathor <mrathor@...ux.microsoft.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
	Naman Jain <namjain@...ux.microsoft.com>,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Michael Kelley <mhklinux@...look.com>,
	Christoph Hellwig <hch@...radead.org>,
	Saurabh Sengar <ssengar@...ux.microsoft.com>,
	ALOK TIWARI <alok.a.tiwari@...cle.com>
Subject: [PATCH v9 1/2] Drivers: hv: Export some symbols for mshv_vtl

MSHV_VTL driver is going to be introduced, which is supposed to
provide interface for Virtual Machine Monitors (VMMs) to control
Virtual Trust Level (VTL). Export the symbols needed
to make it work (vmbus_isr, hv_context and hv_post_message).

Co-developed-by: Roman Kisel <romank@...ux.microsoft.com>
Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
Co-developed-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506110544.q0NDMQVc-lkp@intel.com/
Signed-off-by: Naman Jain <namjain@...ux.microsoft.com>
---
 drivers/hv/hv.c           | 3 +++
 drivers/hv/hyperv_vmbus.h | 1 +
 drivers/hv/vmbus_drv.c    | 4 +++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 936c5f310df6..c924e3294b8b 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -18,6 +18,7 @@
 #include <linux/clockchips.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
+#include <linux/export.h>
 #include <clocksource/hyperv_timer.h>
 #include <asm/mshyperv.h>
 #include <linux/set_memory.h>
@@ -25,6 +26,7 @@
 
 /* The one and only */
 struct hv_context hv_context;
+EXPORT_SYMBOL_GPL(hv_context);
 
 /*
  * hv_init - Main initialization routine.
@@ -104,6 +106,7 @@ int hv_post_message(union hv_connection_id connection_id,
 
 	return hv_result(status);
 }
+EXPORT_SYMBOL_GPL(hv_post_message);
 
 static int hv_alloc_page(void **page, bool decrypt, const char *note)
 {
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index f7fc2630c054..b2862e0a317a 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -33,6 +33,7 @@
  */
 #define HV_UTIL_NEGO_TIMEOUT 55
 
+void vmbus_isr(void);
 
 /* Definitions for the monitored notification facility */
 union hv_monitor_trigger_group {
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 0dc4692b411a..c9ad17ed562d 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -36,6 +36,7 @@
 #include <linux/syscore_ops.h>
 #include <linux/dma-map-ops.h>
 #include <linux/pci.h>
+#include <linux/export.h>
 #include <clocksource/hyperv_timer.h>
 #include <asm/mshyperv.h>
 #include "hyperv_vmbus.h"
@@ -1349,7 +1350,7 @@ static void vmbus_message_sched(struct hv_per_cpu_context *hv_cpu, void *message
 	}
 }
 
-static void vmbus_isr(void)
+void vmbus_isr(void)
 {
 	struct hv_per_cpu_context *hv_cpu
 		= this_cpu_ptr(hv_context.cpu_context);
@@ -1362,6 +1363,7 @@ static void vmbus_isr(void)
 
 	add_interrupt_randomness(vmbus_interrupt);
 }
+EXPORT_SYMBOL_GPL(vmbus_isr);
 
 static irqreturn_t vmbus_percpu_isr(int irq, void *dev_id)
 {
-- 
2.43.0