x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings

The ioremap() function is intended for mapping MMIO. For RAM, the
memremap() function should be used. Convert calls from ioremap() to
memremap() when re-mapping RAM.

This will be used later by SME to control how the encryption mask is
applied to memory mappings, with certain memory locations being mapped
decrypted vs encrypted.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/b13fccb9abbd547a7eef7b1fdfc223431b211c88.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 16 insertions, 15 deletions

diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c
index ef76e5eecf0b..d5de6ee8466d 100644
--- a/drivers/firmware/dmi-sysfs.c
+++ b/drivers/firmware/dmi-sysfs.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/io.h>
+#include <asm/dmi.h>
 
 #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider
 			      the top entry type is only 8 bits */
@@ -380,7 +381,7 @@ static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry,
 	u8 __iomem *mapped;
 	ssize_t wrote = 0;
 
-	mapped = ioremap(sel->access_method_address, sel->area_length);
+	mapped = dmi_remap(sel->access_method_address, sel->area_length);
 	if (!mapped)
 		return -EIO;
 
@@ -390,7 +391,7 @@ static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry,
 		wrote++;
 	}
 
-	iounmap(mapped);
+	dmi_unmap(mapped);
 	return wrote;
 }
 
diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c
index 75273a251603..e83d6aec0c13 100644
--- a/drivers/firmware/pcdp.c
+++ b/drivers/firmware/pcdp.c
@@ -95,7 +95,7 @@ efi_setup_pcdp_console(char *cmdline)
 	if (efi.hcdp == EFI_INVALID_TABLE_ADDR)
 		return -ENODEV;
 
-	pcdp = early_ioremap(efi.hcdp, 4096);
+	pcdp = early_memremap(efi.hcdp, 4096);
 	printk(KERN_INFO "PCDP: v%d at 0x%lx\n", pcdp->rev, efi.hcdp);
 
 	if (strstr(cmdline, "console=hcdp")) {
@@ -131,6 +131,6 @@ efi_setup_pcdp_console(char *cmdline)
 	}
 
 out:
-	early_iounmap(pcdp, 4096);
+	early_memunmap(pcdp, 4096);
 	return rc;
 }
diff --git a/drivers/sfi/sfi_core.c b/drivers/sfi/sfi_core.c
index 296db7a69c27..d5ce53491efb 100644
--- a/drivers/sfi/sfi_core.c
+++ b/drivers/sfi/sfi_core.c
@@ -86,13 +86,13 @@ static struct sfi_table_simple *syst_va __read_mostly;
 /*
  * FW creates and saves the SFI tables in memory. When these tables get
  * used, they may need to be mapped to virtual address space, and the mapping
- * can happen before or after the ioremap() is ready, so a flag is needed
+ * can happen before or after the memremap() is ready, so a flag is needed
  * to indicating this
  */
-static u32 sfi_use_ioremap __read_mostly;
+static u32 sfi_use_memremap __read_mostly;
 
 /*
- * sfi_un/map_memory calls early_ioremap/iounmap which is a __init function
+ * sfi_un/map_memory calls early_memremap/memunmap which is a __init function
  * and introduces section mismatch. So use __ref to make it calm.
  */
 static void __iomem * __ref sfi_map_memory(u64 phys, u32 size)
@@ -100,10 +100,10 @@ static void __iomem * __ref sfi_map_memory(u64 phys, u32 size)
 	if (!phys || !size)
 		return NULL;
 
-	if (sfi_use_ioremap)
-		return ioremap_cache(phys, size);
+	if (sfi_use_memremap)
+		return memremap(phys, size, MEMREMAP_WB);
 	else
-		return early_ioremap(phys, size);
+		return early_memremap(phys, size);
 }
 
 static void __ref sfi_unmap_memory(void __iomem *virt, u32 size)
@@ -111,10 +111,10 @@ static void __ref sfi_unmap_memory(void __iomem *virt, u32 size)
 	if (!virt || !size)
 		return;
 
-	if (sfi_use_ioremap)
-		iounmap(virt);
+	if (sfi_use_memremap)
+		memunmap(virt);
 	else
-		early_iounmap(virt, size);
+		early_memunmap(virt, size);
 }
 
 static void sfi_print_table_header(unsigned long long pa,
@@ -507,8 +507,8 @@ void __init sfi_init_late(void)
 	length = syst_va->header.len;
 	sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple));
 
-	/* Use ioremap now after it is ready */
-	sfi_use_ioremap = 1;
+	/* Use memremap now after it is ready */
+	sfi_use_memremap = 1;
 	syst_va = sfi_map_memory(syst_pa, length);
 
 	sfi_acpi_init();