hv:vtd: fix MISRA-C violations on pointer param should be declared pointer to const

This patch fix MISRA-C violations in arch/x86/vtd.c
on pointer param should be declared pointer to const.

Tracked-On: #861
Signed-off-by: Tw <wei.tan@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

hypervisor/arch/x86/vtd.c

@@ -141,7 +141,7 @@ static inline uint8_t* get_ctx_table(uint32_t dmar_index, uint8_t bus_no)
 	return ctx_tables[dmar_index].buses[bus_no].contents;
 }
 
-bool iommu_snoop_supported(struct acrn_vm *vm)
+bool iommu_snoop_supported(const struct acrn_vm *vm)
 {
 	bool ret;
 

hypervisor/include/arch/x86/vtd.h

@@ -622,7 +622,7 @@ void init_iommu_vm0_domain(struct acrn_vm *vm0);
  * @retval false not support
  *
  */
-bool iommu_snoop_supported(struct acrn_vm *vm);
+bool iommu_snoop_supported(const struct acrn_vm *vm);
 
 /**
   * @}