[RFC PATCH v4 18/28] x86: DMA support for memory encryption

[Tom Lendacky <thomas.lendacky@amd.com>]

Since DMA addresses will effectively look like 48-bit addresses when the
memory encryption mask is set, SWIOTLB is needed if the DMA mask of the
device performing the DMA does not support 48-bits. SWIOTLB will be
initialized to create decrypted bounce buffers for use by these devices.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/include/asm/dma-mapping.h |    5 ++-
 arch/x86/include/asm/mem_encrypt.h |    5 +++
 arch/x86/kernel/pci-dma.c          |   11 +++++--
 arch/x86/kernel/pci-nommu.c        |    2 +
 arch/x86/kernel/pci-swiotlb.c      |    8 ++++-
 arch/x86/mm/mem_encrypt.c          |   22 ++++++++++++++
 include/linux/swiotlb.h            |    1 +
 init/main.c                        |   13 ++++++++
 lib/swiotlb.c                      |   56 +++++++++++++++++++++++++++++++-----
 9 files changed, 106 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 4446162..c9cdcae 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -12,6 +12,7 @@
 #include <asm/io.h>
 #include <asm/swiotlb.h>
 #include <linux/dma-contiguous.h>
+#include <asm/mem_encrypt.h>
 
 #ifdef CONFIG_ISA
 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
@@ -69,12 +70,12 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 
 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-	return paddr;
+	return paddr | sme_me_mask;
 }
 
 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-	return daddr;
+	return daddr & ~sme_me_mask;
 }
 #endif /* CONFIG_X86_DMA_REMAP */
 
diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index e2b7364..87e816f 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -36,6 +36,11 @@ void __init sme_early_decrypt(resource_size_t paddr,
 
 void __init sme_early_init(void);
 
+/* Architecture __weak replacement functions */
+void __init mem_encrypt_init(void);
+
+void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
+
 #define __sme_pa(x)		(__pa((x)) | sme_me_mask)
 #define __sme_pa_nodebug(x)	(__pa_nodebug((x)) | sme_me_mask)
 
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index d30c377..0ce28df 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -92,9 +92,12 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 	/* CMA can be used only in the context which permits sleeping */
 	if (gfpflags_allow_blocking(flag)) {
 		page = dma_alloc_from_contiguous(dev, count, get_order(size));
-		if (page && page_to_phys(page) + size > dma_mask) {
-			dma_release_from_contiguous(dev, page, count);
-			page = NULL;
+		if (page) {
+			addr = phys_to_dma(dev, page_to_phys(page));
+			if (addr + size > dma_mask) {
+				dma_release_from_contiguous(dev, page, count);
+				page = NULL;
+			}
 		}
 	}
 	/* fallback */
@@ -103,7 +106,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 	if (!page)
 		return NULL;
 
-	addr = page_to_phys(page);
+	addr = phys_to_dma(dev, page_to_phys(page));
 	if (addr + size > dma_mask) {
 		__free_pages(page, get_order(size));
 
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 00e71ce..922c10d 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -30,7 +30,7 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
 				 enum dma_data_direction dir,
 				 unsigned long attrs)
 {
-	dma_addr_t bus = page_to_phys(page) + offset;
+	dma_addr_t bus = phys_to_dma(dev, page_to_phys(page)) + offset;
 	WARN_ON(size == 0);
 	if (!check_addr("map_single", dev, bus, size))
 		return DMA_ERROR_CODE;
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 410efb2..a0677a9 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -12,6 +12,8 @@
 #include <asm/dma.h>
 #include <asm/xen/swiotlb-xen.h>
 #include <asm/iommu_table.h>
+#include <asm/mem_encrypt.h>
+
 int swiotlb __read_mostly;
 
 void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
@@ -64,11 +66,13 @@ void x86_swiotlb_free_coherent(struct device *dev, size_t size,
  * pci_swiotlb_detect_override - set swiotlb to 1 if necessary
  *
  * This returns non-zero if we are forced to use swiotlb (by the boot
- * option).
+ * option). If memory encryption is enabled then swiotlb will be set
+ * to 1 so that bounce buffers are allocated and used for devices that
+ * do not support the addressing range required for the encryption mask.
  */
 int __init pci_swiotlb_detect_override(void)
 {
-	if (swiotlb_force == SWIOTLB_FORCE)
+	if ((swiotlb_force == SWIOTLB_FORCE) || sme_active())
 		swiotlb = 1;
 
 	return swiotlb;
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index ec548e9..a46bcf4 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -13,11 +13,14 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
 
 #include <asm/tlbflush.h>
 #include <asm/fixmap.h>
 #include <asm/setup.h>
 #include <asm/bootparam.h>
+#include <asm/cacheflush.h>
 
 extern pmdval_t early_pmd_flags;
 int __init __early_make_pgtable(unsigned long, pmdval_t);
@@ -192,3 +195,22 @@ void __init sme_early_init(void)
 	for (i = 0; i < ARRAY_SIZE(protection_map); i++)
 		protection_map[i] = pgprot_encrypted(protection_map[i]);
 }
+
+/* Architecture __weak replacement functions */
+void __init mem_encrypt_init(void)
+{
+	if (!sme_me_mask)
+		return;
+
+	/* Call into SWIOTLB to update the SWIOTLB DMA buffers */
+	swiotlb_update_mem_attributes();
+}
+
+void swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
+{
+	WARN(PAGE_ALIGN(size) != size,
+	     "size is not page aligned (%#lx)\n", size);
+
+	/* Make the SWIOTLB buffer area decrypted */
+	set_memory_decrypted((unsigned long)vaddr, size >> PAGE_SHIFT);
+}
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 4ee479f..15e7160 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -35,6 +35,7 @@ enum swiotlb_force {
 extern unsigned long swiotlb_nr_tbl(void);
 unsigned long swiotlb_size_or_default(void);
 extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
+extern void __init swiotlb_update_mem_attributes(void);
 
 /*
  * Enumeration for sync targets
diff --git a/init/main.c b/init/main.c
index 8222caa..ba13f8f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -466,6 +466,10 @@ void __init __weak thread_stack_cache_init(void)
 }
 #endif
 
+void __init __weak mem_encrypt_init(void)
+{
+}
+
 /*
  * Set up kernel memory allocators
  */
@@ -614,6 +618,15 @@ asmlinkage __visible void __init start_kernel(void)
 	 */
 	locking_selftest();
 
+	/*
+	 * This needs to be called before any devices perform DMA
+	 * operations that might use the swiotlb bounce buffers.
+	 * This call will mark the bounce buffers as decrypted so
+	 * that their usage will not cause "plain-text" data to be
+	 * decrypted when accessed.
+	 */
+	mem_encrypt_init();
+
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (initrd_start && !initrd_below_start_ok &&
 	    page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index a8d74a7..c463067 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -30,6 +30,7 @@
 #include <linux/highmem.h>
 #include <linux/gfp.h>
 #include <linux/scatterlist.h>
+#include <linux/mem_encrypt.h>
 
 #include <asm/io.h>
 #include <asm/dma.h>
@@ -155,6 +156,17 @@ unsigned long swiotlb_size_or_default(void)
 	return size ? size : (IO_TLB_DEFAULT_SIZE);
 }
 
+void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
+{
+}
+
+/* For swiotlb, clear memory encryption mask from dma addresses */
+static dma_addr_t swiotlb_phys_to_dma(struct device *hwdev,
+				      phys_addr_t address)
+{
+	return phys_to_dma(hwdev, address) & ~sme_me_mask;
+}
+
 /* Note that this doesn't work with highmem page */
 static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
 				      volatile void *address)
@@ -183,6 +195,31 @@ void swiotlb_print_info(void)
 	       bytes >> 20, vstart, vend - 1);
 }
 
+/*
+ * Early SWIOTLB allocation may be to early to allow an architecture to
+ * perform the desired operations.  This function allows the architecture to
+ * call SWIOTLB when the operations are possible.  This function needs to be
+ * called before the SWIOTLB memory is used.
+ */
+void __init swiotlb_update_mem_attributes(void)
+{
+	void *vaddr;
+	unsigned long bytes;
+
+	if (no_iotlb_memory || late_alloc)
+		return;
+
+	vaddr = phys_to_virt(io_tlb_start);
+	bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
+	swiotlb_set_mem_attributes(vaddr, bytes);
+	memset(vaddr, 0, bytes);
+
+	vaddr = phys_to_virt(io_tlb_overflow_buffer);
+	bytes = PAGE_ALIGN(io_tlb_overflow);
+	swiotlb_set_mem_attributes(vaddr, bytes);
+	memset(vaddr, 0, bytes);
+}
+
 int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 {
 	void *v_overflow_buffer;
@@ -320,6 +357,7 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 	io_tlb_start = virt_to_phys(tlb);
 	io_tlb_end = io_tlb_start + bytes;
 
+	swiotlb_set_mem_attributes(tlb, bytes);
 	memset(tlb, 0, bytes);
 
 	/*
@@ -330,6 +368,8 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 	if (!v_overflow_buffer)
 		goto cleanup2;
 
+	swiotlb_set_mem_attributes(v_overflow_buffer, io_tlb_overflow);
+	memset(v_overflow_buffer, 0, io_tlb_overflow);
 	io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);
 
 	/*
@@ -581,7 +621,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 		return SWIOTLB_MAP_ERROR;
 	}
 
-	start_dma_addr = phys_to_dma(hwdev, io_tlb_start);
+	start_dma_addr = swiotlb_phys_to_dma(hwdev, io_tlb_start);
 	return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size,
 				      dir, attrs);
 }
@@ -702,7 +742,7 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 			goto err_warn;
 
 		ret = phys_to_virt(paddr);
-		dev_addr = phys_to_dma(hwdev, paddr);
+		dev_addr = swiotlb_phys_to_dma(hwdev, paddr);
 
 		/* Confirm address can be DMA'd by device */
 		if (dev_addr + size - 1 > dma_mask) {
@@ -812,10 +852,10 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 	map = map_single(dev, phys, size, dir, attrs);
 	if (map == SWIOTLB_MAP_ERROR) {
 		swiotlb_full(dev, size, dir, 1);
-		return phys_to_dma(dev, io_tlb_overflow_buffer);
+		return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
 	}
 
-	dev_addr = phys_to_dma(dev, map);
+	dev_addr = swiotlb_phys_to_dma(dev, map);
 
 	/* Ensure that the address returned is DMA'ble */
 	if (dma_capable(dev, dev_addr, size))
@@ -824,7 +864,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
 	attrs |= DMA_ATTR_SKIP_CPU_SYNC;
 	swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
 
-	return phys_to_dma(dev, io_tlb_overflow_buffer);
+	return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
 }
 EXPORT_SYMBOL_GPL(swiotlb_map_page);
 
@@ -958,7 +998,7 @@ void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 				sg_dma_len(sgl) = 0;
 				return 0;
 			}
-			sg->dma_address = phys_to_dma(hwdev, map);
+			sg->dma_address = swiotlb_phys_to_dma(hwdev, map);
 		} else
 			sg->dma_address = dev_addr;
 		sg_dma_len(sg) = sg->length;
@@ -1026,7 +1066,7 @@ void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 int
 swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
 {
-	return (dma_addr == phys_to_dma(hwdev, io_tlb_overflow_buffer));
+	return (dma_addr == swiotlb_phys_to_dma(hwdev, io_tlb_overflow_buffer));
 }
 EXPORT_SYMBOL(swiotlb_dma_mapping_error);
 
@@ -1039,6 +1079,6 @@ void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 int
 swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
-	return phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
+	return swiotlb_phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
 EXPORT_SYMBOL(swiotlb_dma_supported);

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