Re: [PATCH 07/11] treewide: Replace the use of mem_encrypt_active() with prot_guest_has()

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Le 28/07/2021 à 00:26, Tom Lendacky a écrit :
Replace occurrences of mem_encrypt_active() with calls to prot_guest_has()
with the PATTR_MEM_ENCRYPT attribute.


What about https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20210730114231.23445-1-will@xxxxxxxxxx/ ?

Christophe



Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
---
  arch/x86/kernel/head64.c                | 4 ++--
  arch/x86/mm/ioremap.c                   | 4 ++--
  arch/x86/mm/mem_encrypt.c               | 5 ++---
  arch/x86/mm/pat/set_memory.c            | 3 ++-
  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 +++-
  drivers/gpu/drm/drm_cache.c             | 4 ++--
  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c     | 4 ++--
  drivers/gpu/drm/vmwgfx/vmwgfx_msg.c     | 6 +++---
  drivers/iommu/amd/iommu.c               | 3 ++-
  drivers/iommu/amd/iommu_v2.c            | 3 ++-
  drivers/iommu/iommu.c                   | 3 ++-
  fs/proc/vmcore.c                        | 6 +++---
  kernel/dma/swiotlb.c                    | 4 ++--
  13 files changed, 29 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index de01903c3735..cafed6456d45 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -19,7 +19,7 @@
  #include <linux/start_kernel.h>
  #include <linux/io.h>
  #include <linux/memblock.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
  #include <linux/pgtable.h>
#include <asm/processor.h>
@@ -285,7 +285,7 @@ unsigned long __head __startup_64(unsigned long physaddr,
  	 * there is no need to zero it after changing the memory encryption
  	 * attribute.
  	 */
-	if (mem_encrypt_active()) {
+	if (prot_guest_has(PATTR_MEM_ENCRYPT)) {
  		vaddr = (unsigned long)__start_bss_decrypted;
  		vaddr_end = (unsigned long)__end_bss_decrypted;
  		for (; vaddr < vaddr_end; vaddr += PMD_SIZE) {
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 0f2d5ace5986..5e1c1f5cbbe8 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -693,7 +693,7 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
  bool arch_memremap_can_ram_remap(resource_size_t phys_addr, unsigned long size,
  				 unsigned long flags)
  {
-	if (!mem_encrypt_active())
+	if (!prot_guest_has(PATTR_MEM_ENCRYPT))
  		return true;
if (flags & MEMREMAP_ENC)
@@ -723,7 +723,7 @@ pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
  {
  	bool encrypted_prot;
- if (!mem_encrypt_active())
+	if (!prot_guest_has(PATTR_MEM_ENCRYPT))
  		return prot;
encrypted_prot = true;
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 451de8e84fce..0f1533dbe81c 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -364,8 +364,7 @@ int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size)
  /*
   * SME and SEV are very similar but they are not the same, so there are
   * times that the kernel will need to distinguish between SME and SEV. The
- * sme_active() and sev_active() functions are used for this.  When a
- * distinction isn't needed, the mem_encrypt_active() function can be used.
+ * sme_active() and sev_active() functions are used for this.
   *
   * The trampoline code is a good example for this requirement.  Before
   * paging is activated, SME will access all memory as decrypted, but SEV
@@ -451,7 +450,7 @@ void __init mem_encrypt_free_decrypted_mem(void)
  	 * The unused memory range was mapped decrypted, change the encryption
  	 * attribute from decrypted to encrypted before freeing it.
  	 */
-	if (mem_encrypt_active()) {
+	if (sme_me_mask) {
  		r = set_memory_encrypted(vaddr, npages);
  		if (r) {
  			pr_warn("failed to free unused decrypted pages\n");
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index ad8a5c586a35..6925f2bb4be1 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -18,6 +18,7 @@
  #include <linux/libnvdimm.h>
  #include <linux/vmstat.h>
  #include <linux/kernel.h>
+#include <linux/protected_guest.h>
#include <asm/e820/api.h>
  #include <asm/processor.h>
@@ -1986,7 +1987,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
  	int ret;
/* Nothing to do if memory encryption is not active */
-	if (!mem_encrypt_active())
+	if (!prot_guest_has(PATTR_MEM_ENCRYPT))
  		return 0;
/* Should not be working on unaligned addresses */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index abb928894eac..8407224717df 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -38,6 +38,7 @@
  #include <drm/drm_probe_helper.h>
  #include <linux/mmu_notifier.h>
  #include <linux/suspend.h>
+#include <linux/protected_guest.h>
#include "amdgpu.h"
  #include "amdgpu_irq.h"
@@ -1239,7 +1240,8 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
  	 * however, SME requires an indirect IOMMU mapping because the encryption
  	 * bit is beyond the DMA mask of the chip.
  	 */
-	if (mem_encrypt_active() && ((flags & AMD_ASIC_MASK) == CHIP_RAVEN)) {
+	if (prot_guest_has(PATTR_MEM_ENCRYPT) &&
+	    ((flags & AMD_ASIC_MASK) == CHIP_RAVEN)) {
  		dev_info(&pdev->dev,
  			 "SME is not compatible with RAVEN\n");
  		return -ENOTSUPP;
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c
index 546599f19a93..4d01d44012fd 100644
--- a/drivers/gpu/drm/drm_cache.c
+++ b/drivers/gpu/drm/drm_cache.c
@@ -31,7 +31,7 @@
  #include <linux/dma-buf-map.h>
  #include <linux/export.h>
  #include <linux/highmem.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
  #include <xen/xen.h>
#include <drm/drm_cache.h>
@@ -204,7 +204,7 @@ bool drm_need_swiotlb(int dma_bits)
  	 * Enforce dma_alloc_coherent when memory encryption is active as well
  	 * for the same reasons as for Xen paravirtual hosts.
  	 */
-	if (mem_encrypt_active())
+	if (prot_guest_has(PATTR_MEM_ENCRYPT))
  		return true;
for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index dde8b35bb950..06ec95a650ba 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -29,7 +29,7 @@
  #include <linux/dma-mapping.h>
  #include <linux/module.h>
  #include <linux/pci.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
#include <drm/ttm/ttm_range_manager.h>
  #include <drm/drm_aperture.h>
@@ -634,7 +634,7 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
  		[vmw_dma_map_bind] = "Giving up DMA mappings early."};
/* TTM currently doesn't fully support SEV encryption. */
-	if (mem_encrypt_active())
+	if (prot_guest_has(PATTR_MEM_ENCRYPT))
  		return -EINVAL;
if (vmw_force_coherent)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
index 3d08f5700bdb..0c70573d3dce 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
@@ -28,7 +28,7 @@
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/slab.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
#include <asm/hypervisor.h> @@ -153,7 +153,7 @@ static unsigned long vmw_port_hb_out(struct rpc_channel *channel,
  	unsigned long msg_len = strlen(msg);
/* HB port can't access encrypted memory. */
-	if (hb && !mem_encrypt_active()) {
+	if (hb && !prot_guest_has(PATTR_MEM_ENCRYPT)) {
  		unsigned long bp = channel->cookie_high;
si = (uintptr_t) msg;
@@ -208,7 +208,7 @@ static unsigned long vmw_port_hb_in(struct rpc_channel *channel, char *reply,
  	unsigned long si, di, eax, ebx, ecx, edx;
/* HB port can't access encrypted memory */
-	if (hb && !mem_encrypt_active()) {
+	if (hb && !prot_guest_has(PATTR_MEM_ENCRYPT)) {
  		unsigned long bp = channel->cookie_low;
si = channel->cookie_high;
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 811a49a95d04..def63a8deab4 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -31,6 +31,7 @@
  #include <linux/irqdomain.h>
  #include <linux/percpu.h>
  #include <linux/io-pgtable.h>
+#include <linux/protected_guest.h>
  #include <asm/irq_remapping.h>
  #include <asm/io_apic.h>
  #include <asm/apic.h>
@@ -2178,7 +2179,7 @@ static int amd_iommu_def_domain_type(struct device *dev)
  	 * active, because some of those devices (AMD GPUs) don't have the
  	 * encryption bit in their DMA-mask and require remapping.
  	 */
-	if (!mem_encrypt_active() && dev_data->iommu_v2)
+	if (!prot_guest_has(PATTR_MEM_ENCRYPT) && dev_data->iommu_v2)
  		return IOMMU_DOMAIN_IDENTITY;
return 0;
diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index f8d4ad421e07..ac359bc98523 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -16,6 +16,7 @@
  #include <linux/wait.h>
  #include <linux/pci.h>
  #include <linux/gfp.h>
+#include <linux/protected_guest.h>
#include "amd_iommu.h" @@ -741,7 +742,7 @@ int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
  	 * When memory encryption is active the device is likely not in a
  	 * direct-mapped domain. Forbid using IOMMUv2 functionality for now.
  	 */
-	if (mem_encrypt_active())
+	if (prot_guest_has(PATTR_MEM_ENCRYPT))
  		return -ENODEV;
if (!amd_iommu_v2_supported())
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5419c4b9f27a..ddbedb1b5b6b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -23,6 +23,7 @@
  #include <linux/property.h>
  #include <linux/fsl/mc.h>
  #include <linux/module.h>
+#include <linux/protected_guest.h>
  #include <trace/events/iommu.h>
static struct kset *iommu_group_kset;
@@ -127,7 +128,7 @@ static int __init iommu_subsys_init(void)
  		else
  			iommu_set_default_translated(false);
- if (iommu_default_passthrough() && mem_encrypt_active()) {
+		if (iommu_default_passthrough() && prot_guest_has(PATTR_MEM_ENCRYPT)) {
  			pr_info("Memory encryption detected - Disabling default IOMMU Passthrough\n");
  			iommu_set_default_translated(false);
  		}
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 9a15334da208..b466f543dc00 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -26,7 +26,7 @@
  #include <linux/vmalloc.h>
  #include <linux/pagemap.h>
  #include <linux/uaccess.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
  #include <asm/io.h>
  #include "internal.h"
@@ -177,7 +177,7 @@ ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
   */
  ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
  {
-	return read_from_oldmem(buf, count, ppos, 0, mem_encrypt_active());
+	return read_from_oldmem(buf, count, ppos, 0, prot_guest_has(PATTR_MEM_ENCRYPT));
  }
/*
@@ -378,7 +378,7 @@ static ssize_t __read_vmcore(char *buffer, size_t buflen, loff_t *fpos,
  					    buflen);
  			start = m->paddr + *fpos - m->offset;
  			tmp = read_from_oldmem(buffer, tsz, &start,
-					       userbuf, mem_encrypt_active());
+					       userbuf, prot_guest_has(PATTR_MEM_ENCRYPT));
  			if (tmp < 0)
  				return tmp;
  			buflen -= tsz;
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index e50df8d8f87e..2e8dee23a624 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -34,7 +34,7 @@
  #include <linux/highmem.h>
  #include <linux/gfp.h>
  #include <linux/scatterlist.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
  #include <linux/set_memory.h>
  #ifdef CONFIG_DEBUG_FS
  #include <linux/debugfs.h>
@@ -515,7 +515,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
  	if (!mem)
  		panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
- if (mem_encrypt_active())
+	if (prot_guest_has(PATTR_MEM_ENCRYPT))
  		pr_warn_once("Memory encryption is active and system is using DMA bounce buffers\n");
if (mapping_size > alloc_size) {


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