linux-kernel - RE: [PATCH v10 1/2] Drivers: hv: Export some symbols for mshv

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Message-ID:
 <SN6PR02MB41576606068AD742B6490BB1D4C2A@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Thu, 6 Nov 2025 14:45:31 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Naman Jain <namjain@...ux.microsoft.com>, "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-hyperv@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>,
	Mukesh Rathor <mrathor@...ux.microsoft.com>, Stanislav Kinsburskii
	<skinsburskii@...ux.microsoft.com>, Nuno Das Neves
	<nunodasneves@...ux.microsoft.com>, Christoph Hellwig <hch@...radead.org>,
	Saurabh Sengar <ssengar@...ux.microsoft.com>, ALOK TIWARI
	<alok.a.tiwari@...cle.com>
Subject: RE: [PATCH v10 1/2] Drivers: hv: Export some symbols for mshv_vtl

From: Naman Jain <namjain@...ux.microsoft.com> Sent: Tuesday, October 28, 2025 10:02 PM
> 
> 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>

Reviewed-by: Michael Kelley <mhklinux@...look.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