vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_pgoff = 0;
- vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ /*
+ * According to Xen on ARM ABI (xen/include/public/arch-arm.h):
+ * all memory which is shared with other entities in the system
+ * (including the hypervisor and other guests) must reside in memory
+ * which is mapped as Normal Inner Write-Back Outer Write-Back
+ * Inner-Shareable.
+ */
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
/*
* vm_operations_struct.fault handler will be called if CPU access
if (!xen_obj->pages)
return NULL;
+ /* Please see comment in gem_mmap_obj on mapping and attributes. */
return vmap(xen_obj->pages, xen_obj->num_pages,
- VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+ VM_MAP, PAGE_KERNEL);
}
void xen_drm_front_gem_prime_vunmap(struct drm_gem_object *gem_obj,