3 files changed, 15 insertions, 9 deletions
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 09c5557b1454..e080a39b2108 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -386,4 +386,7 @@ extern bool arch_memremap_can_ram_remap(resource_size_t offset,
 					unsigned long flags);
 #define arch_memremap_can_ram_remap arch_memremap_can_ram_remap
 
+extern bool phys_mem_access_encrypted(unsigned long phys_addr,
+				      unsigned long size);
+
 #endif /* _ASM_X86_IO_H */
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 704fc081c104..34f0e1847dd6 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -400,12 +400,10 @@ void *xlate_dev_mem_ptr(phys_addr_t phys)
 	unsigned long offset = phys & ~PAGE_MASK;
 	void *vaddr;
 
-	/* If page is RAM, we can use __va. Otherwise ioremap and unmap. */
-	if (page_is_ram(start >> PAGE_SHIFT))
-		return __va(phys);
+	/* memremap() maps if RAM, otherwise falls back to ioremap() */
+	vaddr = memremap(start, PAGE_SIZE, MEMREMAP_WB);
 
-	vaddr = ioremap_cache(start, PAGE_SIZE);
-	/* Only add the offset on success and return NULL if the ioremap() failed: */
+	/* Only add the offset on success and return NULL if memremap() failed */
 	if (vaddr)
 		vaddr += offset;
 
@@ -414,10 +412,7 @@ void *xlate_dev_mem_ptr(phys_addr_t phys)
 
 void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
 {
-	if (page_is_ram(phys >> PAGE_SHIFT))
-		return;
-
-	iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK));
+	memunmap((void *)((unsigned long)addr & PAGE_MASK));
 }
 
 /*
@@ -626,6 +621,11 @@ pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
 	return prot;
 }
 
+bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size)
+{
+	return arch_memremap_can_ram_remap(phys_addr, size, 0);
+}
+
 #ifdef CONFIG_ARCH_USE_MEMREMAP_PROT
 /* Remap memory with encryption */
 void __init *early_memremap_encrypted(resource_size_t phys_addr,
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 88990ab87961..fe7d57a8fb60 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -744,6 +744,9 @@ EXPORT_SYMBOL(arch_io_free_memtype_wc);
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 				unsigned long size, pgprot_t vma_prot)
 {
+	if (!phys_mem_access_encrypted(pfn << PAGE_SHIFT, size))
+		vma_prot = pgprot_decrypted(vma_prot);
+
 	return vma_prot;
 }