[PATCH v6 31/34] x86/mm: Use proper encryption attributes with /dev/mem

[Tom Lendacky]

When accessing memory using /dev/mem (or /dev/kmem) use the proper
encryption attributes when mapping the memory.

To insure the proper attributes are applied when reading or writing
/dev/mem, update the xlate_dev_mem_ptr() function to use memremap()
which will essentially perform the same steps of applying __va for
RAM or using ioremap() for if not RAM.

To insure the proper attributes are applied when mmapping /dev/mem,
update the phys_mem_access_prot() to call phys_mem_access_encrypted(),
a new function which will check if the memory should be mapped encrypted
or not. If it is not to be mapped encrypted then the VMA protection
value is updated to remove the encryption bit.

Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
---
 arch/x86/include/asm/io.h |    3 +++
 arch/x86/mm/ioremap.c     |   18 +++++++++---------
 arch/x86/mm/pat.c         |    3 +++
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 9eac5a5..db163d7 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -385,4 +385,7 @@ extern bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
 					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 99cda55..56dd5b2 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -404,12 +404,10 @@ 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;
 
@@ -418,10 +416,7 @@ 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));
 }
 
 /*
@@ -630,6 +625,11 @@ 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 6753d9c..b970c95 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -748,6 +748,9 @@ void arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
 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;
 }