Re: [PATCH v2 2/2] mshv: handle gpa intercepts for arm64

[Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>]

On Mon, Jan 05, 2026 at 12:28:37PM +0000, Anirudh Rayabharam wrote:
> From: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
> 
> The mshv driver now uses movable pages for guests. For arm64 guests
> to be functional, handle gpa intercepts for arm64 too (the current
> code implements handling only for x86).
> 
> Move some arch-agnostic functions out of #ifdefs so that they can be
> re-used.
> 
> Fixes: b9a66cd5ccbb ("mshv: Add support for movable memory regions")

I'm not sure that this patch needs "Fixes" tag as it introduced new
functionality rather than fixing a bug.

Thanks,
Stanislav

> Signed-off-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
> ---
>  drivers/hv/mshv_root_main.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c
> index 9cf28a3f12fe..f8c4c2ae2cc9 100644
> --- a/drivers/hv/mshv_root_main.c
> +++ b/drivers/hv/mshv_root_main.c
> @@ -608,7 +608,6 @@ mshv_partition_region_by_gfn(struct mshv_partition *partition, u64 gfn)
>  	return NULL;
>  }
>  
> -#ifdef CONFIG_X86_64
>  static struct mshv_mem_region *
>  mshv_partition_region_by_gfn_get(struct mshv_partition *p, u64 gfn)
>  {
> @@ -640,12 +639,17 @@ static bool mshv_handle_gpa_intercept(struct mshv_vp *vp)
>  {
>  	struct mshv_partition *p = vp->vp_partition;
>  	struct mshv_mem_region *region;
> -	struct hv_x64_memory_intercept_message *msg;
>  	bool ret;
>  	u64 gfn;
> -
> -	msg = (struct hv_x64_memory_intercept_message *)
> +#if defined(CONFIG_X86_64)
> +	struct hv_x64_memory_intercept_message *msg =
> +		(struct hv_x64_memory_intercept_message *)
> +		vp->vp_intercept_msg_page->u.payload;
> +#elif defined(CONFIG_ARM64)
> +	struct hv_arm64_memory_intercept_message *msg =
> +		(struct hv_arm64_memory_intercept_message *)
>  		vp->vp_intercept_msg_page->u.payload;
> +#endif
>  
>  	gfn = HVPFN_DOWN(msg->guest_physical_address);
>  
> @@ -663,9 +667,6 @@ static bool mshv_handle_gpa_intercept(struct mshv_vp *vp)
>  
>  	return ret;
>  }
> -#else  /* CONFIG_X86_64 */
> -static bool mshv_handle_gpa_intercept(struct mshv_vp *vp) { return false; }
> -#endif /* CONFIG_X86_64 */
>  
>  static bool mshv_vp_handle_intercept(struct mshv_vp *vp)
>  {
> -- 
> 2.34.1
>