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Re: [Xen-devel] [PATCH v14 3/9] iommu: push use of type-safe DFN and MFN into iommu_ops

Hi Paul,

On 04/10/2018 14:04, Paul Durrant wrote:

-----Original Message-----
From: Paul Durrant [mailto:paul.durrant@xxxxxxxxxx]
Sent: 04 October 2018 11:46
To: xen-devel@xxxxxxxxxxxxxxxxxxxx
Cc: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Andrew Cooper
<Andrew.Cooper3@xxxxxxxxxx>; George Dunlap <George.Dunlap@xxxxxxxxxx>
Subject: [PATCH v14 3/9] iommu: push use of type-safe DFN and MFN into
iommu_ops

This patch modifies the methods in struct iommu_ops to use type-safe DFN
and MFN. This follows on from the prior patch that modified the functions
exported in xen/iommu.h.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>


Julien, you should have been cc-ed on this one too. Not sure why I missed you 
off the list... sorry about that. Could I get an ack or otherwise please?


The patch looks good to me:

Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,



   Paul


Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Roger Pau Monne <roger.pau@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>

v14:
  - Re-base.

v9:
  - Re-base.

v7:
  - Re-base and re-name BFN -> DFN.
  - Added Jan's A-b since re-naming was purely mechanical.

v6:
  - Re-base.

v3:
  - Remove some use of intermediate 'frame' variables.

v2:
  - Addressed comments from Jan.
  - Extend use of intermediate 'frame' variable to avoid directly
    encapsulating gfn values as bfns (now dfns) or vice versa.
---
  xen/drivers/passthrough/amd/iommu_map.c       | 46 ++++++++++++++++------
-----
  xen/drivers/passthrough/arm/smmu.c            | 16 +++++-----
  xen/drivers/passthrough/iommu.c               |  9 +++---
  xen/drivers/passthrough/vtd/iommu.c           | 26 +++++++--------
  xen/drivers/passthrough/x86/iommu.c           |  2 +-
  xen/include/asm-x86/hvm/svm/amd-iommu-proto.h |  8 ++---
  xen/include/xen/iommu.h                       | 13 +++++---
  7 files changed, 66 insertions(+), 54 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_map.c
b/xen/drivers/passthrough/amd/iommu_map.c
index 61ade71850..c89c54fdb6 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -631,7 +631,7 @@ static int update_paging_mode(struct domain *d,
unsigned long dfn)
      return 0;
  }

-int amd_iommu_map_page(struct domain *d, unsigned long dfn, unsigned long
mfn,
+int amd_iommu_map_page(struct domain *d, dfn_t dfn, mfn_t mfn,
                         unsigned int flags)
  {
      bool_t need_flush = 0;
@@ -651,7 +651,8 @@ int amd_iommu_map_page(struct domain *d, unsigned long
dfn, unsigned long mfn,
      if ( rc )
      {
          spin_unlock(&hd->arch.mapping_lock);
-        AMD_IOMMU_DEBUG("Root table alloc failed, dfn = %lx\n", dfn);
+        AMD_IOMMU_DEBUG("Root table alloc failed, dfn = %"PRI_dfn"\n",
+                        dfn_x(dfn));
          domain_crash(d);
          return rc;
      }
@@ -660,25 +661,27 @@ int amd_iommu_map_page(struct domain *d, unsigned
long dfn, unsigned long mfn,
       * we might need a deeper page table for wider dfn now */
      if ( is_hvm_domain(d) )
      {
-        if ( update_paging_mode(d, dfn) )
+        if ( update_paging_mode(d, dfn_x(dfn)) )
          {
              spin_unlock(&hd->arch.mapping_lock);
-            AMD_IOMMU_DEBUG("Update page mode failed dfn = %lx\n", dfn);
+            AMD_IOMMU_DEBUG("Update page mode failed dfn = %"PRI_dfn"\n",
+                            dfn_x(dfn));
              domain_crash(d);
              return -EFAULT;
          }
      }

-    if ( iommu_pde_from_dfn(d, dfn, pt_mfn) || (pt_mfn[1] == 0) )
+    if ( iommu_pde_from_dfn(d, dfn_x(dfn), pt_mfn) || (pt_mfn[1] == 0) )
      {
          spin_unlock(&hd->arch.mapping_lock);
-        AMD_IOMMU_DEBUG("Invalid IO pagetable entry dfn = %lx\n", dfn);
+        AMD_IOMMU_DEBUG("Invalid IO pagetable entry dfn = %"PRI_dfn"\n",
+                        dfn_x(dfn));
          domain_crash(d);
          return -EFAULT;
      }

      /* Install 4k mapping first */
-    need_flush = set_iommu_pte_present(pt_mfn[1], dfn, mfn,
+    need_flush = set_iommu_pte_present(pt_mfn[1], dfn_x(dfn), mfn_x(mfn),
                                         IOMMU_PAGING_MODE_LEVEL_1,
                                         !!(flags & IOMMUF_writable),
                                         !!(flags & IOMMUF_readable));
@@ -690,7 +693,7 @@ int amd_iommu_map_page(struct domain *d, unsigned long
dfn, unsigned long mfn,
      /* 4K mapping for PV guests never changes,
       * no need to flush if we trust non-present bits */
      if ( is_hvm_domain(d) )
-        amd_iommu_flush_pages(d, dfn, 0);
+        amd_iommu_flush_pages(d, dfn_x(dfn), 0);

      for ( merge_level = IOMMU_PAGING_MODE_LEVEL_2;
            merge_level <= hd->arch.paging_mode; merge_level++ )
@@ -698,15 +701,16 @@ int amd_iommu_map_page(struct domain *d, unsigned
long dfn, unsigned long mfn,
          if ( pt_mfn[merge_level] == 0 )
              break;
          if ( !iommu_update_pde_count(d, pt_mfn[merge_level],
-                                     dfn, mfn, merge_level) )
+                                     dfn_x(dfn), mfn_x(mfn), merge_level)
)
              break;

-        if ( iommu_merge_pages(d, pt_mfn[merge_level], dfn,
+        if ( iommu_merge_pages(d, pt_mfn[merge_level], dfn_x(dfn),
                                 flags, merge_level) )
          {
              spin_unlock(&hd->arch.mapping_lock);
              AMD_IOMMU_DEBUG("Merge iommu page failed at level %d, "
-                            "dfn = %lx mfn = %lx\n", merge_level, dfn,
mfn);
+                            "dfn = %"PRI_dfn" mfn = %"PRI_mfn"\n",
+                            merge_level, dfn_x(dfn), mfn_x(mfn));
              domain_crash(d);
              return -EFAULT;
          }
@@ -720,7 +724,7 @@ out:
      return 0;
  }

-int amd_iommu_unmap_page(struct domain *d, unsigned long dfn)
+int amd_iommu_unmap_page(struct domain *d, dfn_t dfn)
  {
      unsigned long pt_mfn[7];
      struct domain_iommu *hd = dom_iommu(d);
@@ -742,31 +746,33 @@ int amd_iommu_unmap_page(struct domain *d, unsigned
long dfn)
       * we might need a deeper page table for lager dfn now */
      if ( is_hvm_domain(d) )
      {
-        int rc = update_paging_mode(d, dfn);
+        int rc = update_paging_mode(d, dfn_x(dfn));

          if ( rc )
          {
              spin_unlock(&hd->arch.mapping_lock);
-            AMD_IOMMU_DEBUG("Update page mode failed dfn = %lx\n", dfn);
+            AMD_IOMMU_DEBUG("Update page mode failed dfn = %"PRI_dfn"\n",
+                            dfn_x(dfn));
              if ( rc != -EADDRNOTAVAIL )
                  domain_crash(d);
              return rc;
          }
      }

-    if ( iommu_pde_from_dfn(d, dfn, pt_mfn) || (pt_mfn[1] == 0) )
+    if ( iommu_pde_from_dfn(d, dfn_x(dfn), pt_mfn) || (pt_mfn[1] == 0) )
      {
          spin_unlock(&hd->arch.mapping_lock);
-        AMD_IOMMU_DEBUG("Invalid IO pagetable entry dfn = %lx\n", dfn);
+        AMD_IOMMU_DEBUG("Invalid IO pagetable entry dfn = %"PRI_dfn"\n",
+                        dfn_x(dfn));
          domain_crash(d);
          return -EFAULT;
      }

      /* mark PTE as 'page not present' */
-    clear_iommu_pte_present(pt_mfn[1], dfn);
+    clear_iommu_pte_present(pt_mfn[1], dfn_x(dfn));
      spin_unlock(&hd->arch.mapping_lock);

-    amd_iommu_flush_pages(d, dfn, 0);
+    amd_iommu_flush_pages(d, dfn_x(dfn), 0);

      return 0;
  }
@@ -787,7 +793,9 @@ int amd_iommu_reserve_domain_unity_map(struct domain
*domain,
      gfn = phys_addr >> PAGE_SHIFT;
      for ( i = 0; i < npages; i++ )
      {
-        rt = amd_iommu_map_page(domain, gfn +i, gfn +i, flags);
+        unsigned long frame = gfn + i;
+
+        rt = amd_iommu_map_page(domain, _dfn(frame), _mfn(frame), flags);
          if ( rt != 0 )
              return rt;
      }
diff --git a/xen/drivers/passthrough/arm/smmu.c
b/xen/drivers/passthrough/arm/smmu.c
index 1eda96a72a..53e5823d05 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -2550,8 +2550,7 @@ static int __must_check
arm_smmu_iotlb_flush_all(struct domain *d)
        return 0;
  }

-static int __must_check arm_smmu_iotlb_flush(struct domain *d,
-                                             unsigned long dfn,
+static int __must_check arm_smmu_iotlb_flush(struct domain *d, dfn_t dfn,
                                               unsigned int page_count)
  {
        /* ARM SMMU v1 doesn't have flush by VMA and VMID */
@@ -2748,8 +2747,8 @@ static void arm_smmu_iommu_domain_teardown(struct
domain *d)
        xfree(xen_domain);
  }

-static int __must_check arm_smmu_map_page(struct domain *d, unsigned long
dfn,
-                       unsigned long mfn, unsigned int flags)
+static int __must_check arm_smmu_map_page(struct domain *d, dfn_t dfn,
+                                         mfn_t mfn, unsigned int flags)
  {
        p2m_type_t t;

@@ -2762,7 +2761,7 @@ static int __must_check arm_smmu_map_page(struct
domain *d, unsigned long dfn,
         * function should only be used by gnttab code with gfn == mfn ==
dfn.
         */
        BUG_ON(!is_domain_direct_mapped(d));
-       BUG_ON(mfn != dfn);
+       BUG_ON(mfn_x(mfn) != dfn_x(dfn));

        /* We only support readable and writable flags */
        if (!(flags & (IOMMUF_readable | IOMMUF_writable)))
@@ -2774,10 +2773,11 @@ static int __must_check arm_smmu_map_page(struct
domain *d, unsigned long dfn,
         * The function guest_physmap_add_entry replaces the current mapping
         * if there is already one...
         */
-       return guest_physmap_add_entry(d, _gfn(dfn), _mfn(dfn), 0, t);
+       return guest_physmap_add_entry(d, _gfn(dfn_x(dfn)),
_mfn(dfn_x(dfn)),
+                                      0, t);
  }

-static int __must_check arm_smmu_unmap_page(struct domain *d, unsigned
long dfn)
+static int __must_check arm_smmu_unmap_page(struct domain *d, dfn_t dfn)
  {
        /*
         * This function should only be used by gnttab code when the domain
@@ -2786,7 +2786,7 @@ static int __must_check arm_smmu_unmap_page(struct
domain *d, unsigned long dfn)
        if ( !is_domain_direct_mapped(d) )
                return -EINVAL;

-       return guest_physmap_remove_page(d, _gfn(dfn), _mfn(dfn), 0);
+       return guest_physmap_remove_page(d, _gfn(dfn_x(dfn)),
_mfn(dfn_x(dfn)), 0);
  }

  static const struct iommu_ops arm_smmu_iommu_ops = {
diff --git a/xen/drivers/passthrough/iommu.c
b/xen/drivers/passthrough/iommu.c
index ef9d651317..d61fbbf439 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -224,7 +224,8 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
                    == PGT_writable_page) )
                  mapping |= IOMMUF_writable;

-            ret = hd->platform_ops->map_page(d, dfn, mfn, mapping);
+            ret = hd->platform_ops->map_page(d, _dfn(dfn), _mfn(mfn),
+                                             mapping);
              if ( !rc )
                  rc = ret;

@@ -294,7 +295,7 @@ int iommu_map_page(struct domain *d, dfn_t dfn, mfn_t
mfn,
      if ( !iommu_enabled || !hd->platform_ops )
          return 0;

-    rc = hd->platform_ops->map_page(d, dfn_x(dfn), mfn_x(mfn), flags);
+    rc = hd->platform_ops->map_page(d, dfn, mfn, flags);
      if ( unlikely(rc) )
      {
          if ( !d->is_shutting_down && printk_ratelimit() )
@@ -317,7 +318,7 @@ int iommu_unmap_page(struct domain *d, dfn_t dfn)
      if ( !iommu_enabled || !hd->platform_ops )
          return 0;

-    rc = hd->platform_ops->unmap_page(d, dfn_x(dfn));
+    rc = hd->platform_ops->unmap_page(d, dfn);
      if ( unlikely(rc) )
      {
          if ( !d->is_shutting_down && printk_ratelimit() )
@@ -357,7 +358,7 @@ int iommu_iotlb_flush(struct domain *d, dfn_t dfn,
unsigned int page_count)
      if ( !iommu_enabled || !hd->platform_ops || !hd->platform_ops-

iotlb_flush )

          return 0;

-    rc = hd->platform_ops->iotlb_flush(d, dfn_x(dfn), page_count);
+    rc = hd->platform_ops->iotlb_flush(d, dfn, page_count);
      if ( unlikely(rc) )
      {
          if ( !d->is_shutting_down && printk_ratelimit() )
diff --git a/xen/drivers/passthrough/vtd/iommu.c
b/xen/drivers/passthrough/vtd/iommu.c
index 485704bcce..7e185c43f3 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -584,8 +584,7 @@ static int __must_check iommu_flush_all(void)
      return rc;
  }

-static int __must_check iommu_flush_iotlb(struct domain *d,
-                                          unsigned long dfn,
+static int __must_check iommu_flush_iotlb(struct domain *d, dfn_t dfn,
                                            bool_t dma_old_pte_present,
                                            unsigned int page_count)
  {
@@ -612,12 +611,12 @@ static int __must_check iommu_flush_iotlb(struct
domain *d,
          if ( iommu_domid == -1 )
              continue;

-        if ( page_count != 1 || dfn == dfn_x(INVALID_DFN) )
+        if ( page_count != 1 || dfn_eq(dfn, INVALID_DFN) )
              rc = iommu_flush_iotlb_dsi(iommu, iommu_domid,
                                         0, flush_dev_iotlb);
          else
              rc = iommu_flush_iotlb_psi(iommu, iommu_domid,
-                                       __dfn_to_daddr(dfn),
+                                       dfn_to_daddr(dfn),
                                         PAGE_ORDER_4K,
                                         !dma_old_pte_present,
                                         flush_dev_iotlb);
@@ -633,7 +632,7 @@ static int __must_check iommu_flush_iotlb(struct
domain *d,
  }

  static int __must_check iommu_flush_iotlb_pages(struct domain *d,
-                                                unsigned long dfn,
+                                                dfn_t dfn,
                                                  unsigned int page_count)
  {
      return iommu_flush_iotlb(d, dfn, 1, page_count);
@@ -641,7 +640,7 @@ static int __must_check iommu_flush_iotlb_pages(struct
domain *d,

  static int __must_check iommu_flush_iotlb_all(struct domain *d)
  {
-    return iommu_flush_iotlb(d, dfn_x(INVALID_DFN), 0, 0);
+    return iommu_flush_iotlb(d, INVALID_DFN, 0, 0);
  }

  /* clear one page's page table */
@@ -676,7 +675,7 @@ static int __must_check dma_pte_clear_one(struct
domain *domain, u64 addr)
      iommu_flush_cache_entry(pte, sizeof(struct dma_pte));

      if ( !this_cpu(iommu_dont_flush_iotlb) )
-        rc = iommu_flush_iotlb_pages(domain, addr >> PAGE_SHIFT_4K, 1);
+        rc = iommu_flush_iotlb_pages(domain, daddr_to_dfn(addr), 1);

      unmap_vtd_domain_page(page);

@@ -1763,8 +1762,7 @@ static void iommu_domain_teardown(struct domain *d)
  }

  static int __must_check intel_iommu_map_page(struct domain *d,
-                                             unsigned long dfn,
-                                             unsigned long mfn,
+                                             dfn_t dfn, mfn_t mfn,
                                               unsigned int flags)
  {
      struct domain_iommu *hd = dom_iommu(d);
@@ -1782,16 +1780,16 @@ static int __must_check
intel_iommu_map_page(struct domain *d,

      spin_lock(&hd->arch.mapping_lock);

-    pg_maddr = addr_to_dma_page_maddr(d, __dfn_to_daddr(dfn), 1);
+    pg_maddr = addr_to_dma_page_maddr(d, dfn_to_daddr(dfn), 1);
      if ( pg_maddr == 0 )
      {
          spin_unlock(&hd->arch.mapping_lock);
          return -ENOMEM;
      }
      page = (struct dma_pte *)map_vtd_domain_page(pg_maddr);
-    pte = page + (dfn & LEVEL_MASK);
+    pte = page + (dfn_x(dfn) & LEVEL_MASK);
      old = *pte;
-    dma_set_pte_addr(new, (paddr_t)mfn << PAGE_SHIFT_4K);
+    dma_set_pte_addr(new, mfn_to_maddr(mfn));
      dma_set_pte_prot(new,
                       ((flags & IOMMUF_readable) ? DMA_PTE_READ  : 0) |
                       ((flags & IOMMUF_writable) ? DMA_PTE_WRITE : 0));
@@ -1819,13 +1817,13 @@ static int __must_check
intel_iommu_map_page(struct domain *d,
  }

  static int __must_check intel_iommu_unmap_page(struct domain *d,
-                                               unsigned long dfn)
+                                               dfn_t dfn)
  {
      /* Do nothing if hardware domain and iommu supports pass thru. */
      if ( iommu_hwdom_passthrough && is_hardware_domain(d) )
          return 0;

-    return dma_pte_clear_one(d, __dfn_to_daddr(dfn));
+    return dma_pte_clear_one(d, dfn_to_daddr(dfn));
  }

  int iommu_pte_flush(struct domain *d, uint64_t dfn, uint64_t *pte,
diff --git a/xen/drivers/passthrough/x86/iommu.c
b/xen/drivers/passthrough/x86/iommu.c
index 34727b6653..f410717a59 100644
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -68,7 +68,7 @@ int arch_iommu_populate_page_table(struct domain *d)
              {
                  ASSERT(!(gfn >> DEFAULT_DOMAIN_ADDRESS_WIDTH));
                  BUG_ON(SHARED_M2P(gfn));
-                rc = hd->platform_ops->map_page(d, gfn, mfn,
+                rc = hd->platform_ops->map_page(d, _dfn(gfn), _mfn(mfn),
                                                  IOMMUF_readable |
                                                  IOMMUF_writable);
              }
diff --git a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
index 99bc21c7b3..3083d625bd 100644
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -52,9 +52,9 @@ int amd_iommu_init(void);
  int amd_iommu_update_ivrs_mapping_acpi(void);

  /* mapping functions */
-int __must_check amd_iommu_map_page(struct domain *d, unsigned long gfn,
-                                    unsigned long mfn, unsigned int
flags);
-int __must_check amd_iommu_unmap_page(struct domain *d, unsigned long
gfn);
+int __must_check amd_iommu_map_page(struct domain *d, dfn_t dfn,
+                                    mfn_t mfn, unsigned int flags);
+int __must_check amd_iommu_unmap_page(struct domain *d, dfn_t dfn);
  u64 amd_iommu_get_next_table_from_pte(u32 *entry);
  int __must_check amd_iommu_alloc_root(struct domain_iommu *hd);
  int amd_iommu_reserve_domain_unity_map(struct domain *domain,
@@ -77,7 +77,7 @@ void iommu_dte_set_guest_cr3(u32 *dte, u16 dom_id, u64
gcr3,

  /* send cmd to iommu */
  void amd_iommu_flush_all_pages(struct domain *d);
-void amd_iommu_flush_pages(struct domain *d, unsigned long gfn,
+void amd_iommu_flush_pages(struct domain *d, unsigned long dfn,
                             unsigned int order);
  void amd_iommu_flush_iotlb(u8 devfn, const struct pci_dev *pdev,
                             uint64_t gaddr, unsigned int order);
diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index f9d86fc816..7313957c81 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -48,6 +48,11 @@ static inline dfn_t dfn_add(dfn_t dfn, unsigned long i)
      return _dfn(dfn_x(dfn) + i);
  }

+static inline bool_t dfn_eq(dfn_t x, dfn_t y)
+{
+    return dfn_x(x) == dfn_x(y);
+}
+
  extern bool_t iommu_enable, iommu_enabled;
  extern bool_t force_iommu, iommu_verbose;
  extern bool_t iommu_workaround_bios_bug, iommu_igfx;
@@ -174,9 +179,9 @@ struct iommu_ops {
  #endif /* HAS_PCI */

      void (*teardown)(struct domain *d);
-    int __must_check (*map_page)(struct domain *d, unsigned long dfn,
-                                 unsigned long mfn, unsigned int flags);
-    int __must_check (*unmap_page)(struct domain *d, unsigned long dfn);
+    int __must_check (*map_page)(struct domain *d, dfn_t dfn, mfn_t mfn,
+                                 unsigned int flags);
+    int __must_check (*unmap_page)(struct domain *d, dfn_t dfn);
      void (*free_page_table)(struct page_info *);
  #ifdef CONFIG_X86
      void (*update_ire_from_apic)(unsigned int apic, unsigned int reg,
unsigned int value);
@@ -187,7 +192,7 @@ struct iommu_ops {
      void (*resume)(void);
      void (*share_p2m)(struct domain *d);
      void (*crash_shutdown)(void);
-    int __must_check (*iotlb_flush)(struct domain *d, unsigned long dfn,
+    int __must_check (*iotlb_flush)(struct domain *d, dfn_t dfn,
                                      unsigned int page_count);
      int __must_check (*iotlb_flush_all)(struct domain *d);
      int (*get_reserved_device_memory)(iommu_grdm_t *, void *);
--
2.11.0




--
Julien Grall

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