[Xen-devel] [PATCH v4 12/12] AMD/IOMMU: miscellaneous DTE handling adjustments

[Jan Beulich <JBeulich@xxxxxxxx>]

First and foremost switch boolean fields to bool. Adjust a few related
function parameters as well. Then
- in amd_iommu_set_intremap_table() don't use literal numbers,
- in iommu_dte_add_device_entry() use a compound literal instead of many
   assignments,
- in amd_iommu_setup_domain_device()
   - eliminate a pointless local variable,
   - use || instead of && when deciding whether to clear an entry,
   - clear the I field without any checking of ATS / IOTLB state,
- leave reserved fields unnamed.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v4: New.

--- a/xen/drivers/passthrough/amd/iommu_intr.c
+++ b/xen/drivers/passthrough/amd/iommu_intr.c
@@ -69,8 +69,7 @@ union irte_cptr {
      const union irte128 *ptr128;
  } __transparent__;
  
-#define INTREMAP_LENGTH 0xB
-#define INTREMAP_ENTRIES (1 << INTREMAP_LENGTH)
+#define INTREMAP_ENTRIES (1 << IOMMU_INTREMAP_LENGTH)
  
  struct ioapic_sbdf ioapic_sbdf[MAX_IO_APICS];
  struct hpet_sbdf hpet_sbdf;
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -101,51 +101,52 @@ static unsigned int set_iommu_pte_presen
  
  void amd_iommu_set_root_page_table(struct amd_iommu_dte *dte,
                                     uint64_t root_ptr, uint16_t domain_id,
-                                   uint8_t paging_mode, uint8_t valid)
+                                   uint8_t paging_mode, bool valid)
  {
      dte->domain_id = domain_id;
      dte->pt_root = paddr_to_pfn(root_ptr);
-    dte->iw = 1;
-    dte->ir = 1;
+    dte->iw = true;
+    dte->ir = true;
      dte->paging_mode = paging_mode;
-    dte->tv = 1;
+    dte->tv = true;
      dte->v = valid;
  }
  
  void __init amd_iommu_set_intremap_table(
-    struct amd_iommu_dte *dte, uint64_t intremap_ptr, uint8_t int_valid)
+    struct amd_iommu_dte *dte, uint64_t intremap_ptr, bool valid)
  {
      dte->it_root = intremap_ptr >> 6;
-    dte->int_tab_len = 0xb; /* 2048 entries */
-    dte->int_ctl = 2; /* fixed and arbitrated interrupts remapped */
-    dte->ig = 0; /* unmapped interrupt results io page faults */
-    dte->iv = int_valid;
+    dte->int_tab_len = IOMMU_INTREMAP_LENGTH;
+    dte->int_ctl = IOMMU_DEV_TABLE_INT_CONTROL_TRANSLATED;
+    dte->ig = false; /* unmapped interrupts result in i/o page faults */
+    dte->iv = valid;
  }
  
  void __init iommu_dte_add_device_entry(struct amd_iommu_dte *dte,
-                                       struct ivrs_mappings *ivrs_dev)
+                                       const struct ivrs_mappings *ivrs_dev)
  {
      uint8_t flags = ivrs_dev->device_flags;
  
-    memset(dte, 0, sizeof(*dte));
-
-    dte->init_pass = MASK_EXTR(flags, ACPI_IVHD_INIT_PASS);
-    dte->ext_int_pass = MASK_EXTR(flags, ACPI_IVHD_EINT_PASS);
-    dte->nmi_pass = MASK_EXTR(flags, ACPI_IVHD_NMI_PASS);
-    dte->lint0_pass = MASK_EXTR(flags, ACPI_IVHD_LINT0_PASS);
-    dte->lint1_pass = MASK_EXTR(flags, ACPI_IVHD_LINT1_PASS);
-    dte->sys_mgt = MASK_EXTR(flags, ACPI_IVHD_SYSTEM_MGMT);
-    dte->ex = ivrs_dev->dte_allow_exclusion;
+    *dte = (struct amd_iommu_dte){
+        .init_pass = flags & ACPI_IVHD_INIT_PASS,
+        .ext_int_pass = flags & ACPI_IVHD_EINT_PASS,
+        .nmi_pass = flags & ACPI_IVHD_NMI_PASS,
+        .lint0_pass = flags & ACPI_IVHD_LINT0_PASS,
+        .lint1_pass = flags & ACPI_IVHD_LINT1_PASS,
+        .ioctl = IOMMU_DEV_TABLE_IO_CONTROL_ABORTED,
+        .sys_mgt = MASK_EXTR(flags, ACPI_IVHD_SYSTEM_MGMT),
+        .ex = ivrs_dev->dte_allow_exclusion,
+    };
  }
  
  void iommu_dte_set_guest_cr3(struct amd_iommu_dte *dte, uint16_t dom_id,
-                             uint64_t gcr3_mfn, uint8_t gv, uint8_t glx)
+                             uint64_t gcr3_mfn, bool gv, uint8_t glx)
  {
  #define GCR3_MASK(hi, lo) (((1ul << ((hi) + 1)) - 1) & ~((1ul << (lo)) - 1))
  #define GCR3_SHIFT(lo) ((lo) - PAGE_SHIFT)
  
      /* I bit must be set when gcr3 is enabled */
-    dte->i = 1;
+    dte->i = true;
  
      dte->gcr3_trp_14_12 = (gcr3_mfn & GCR3_MASK(14, 12)) >> GCR3_SHIFT(12);
      dte->gcr3_trp_30_15 = (gcr3_mfn & GCR3_MASK(30, 15)) >> GCR3_SHIFT(15);
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -93,7 +93,6 @@ static void amd_iommu_setup_domain_devic
      struct amd_iommu_dte *table, *dte;
      unsigned long flags;
      int req_id, valid = 1;
-    int dte_i = 0;
      u8 bus = pdev->bus;
      const struct domain_iommu *hd = dom_iommu(domain);
  
@@ -103,9 +102,6 @@ static void amd_iommu_setup_domain_devic
      if ( iommu_hwdom_passthrough && is_hardware_domain(domain) )
          valid = 0;
  
-    if ( ats_enabled )
-        dte_i = 1;
-
      /* get device-table entry */
      req_id = get_dma_requestor_id(iommu->seg, PCI_BDF2(bus, devfn));
      table = iommu->dev_table.buffer;
@@ -122,7 +118,7 @@ static void amd_iommu_setup_domain_devic
  
          if ( pci_ats_device(iommu->seg, bus, pdev->devfn) &&
               iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) )
-            dte->i = dte_i;
+            dte->i = ats_enabled;
  
          amd_iommu_flush_device(iommu, req_id);
  
@@ -288,14 +284,11 @@ void amd_iommu_disable_domain_device(str
      dte = &table[req_id];
  
      spin_lock_irqsave(&iommu->lock, flags);
-    if ( dte->tv && dte->v )
+    if ( dte->tv || dte->v )
      {
-        dte->tv = 0;
-        dte->v = 0;
-
-        if ( pci_ats_device(iommu->seg, bus, pdev->devfn) &&
-             iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) )
-            dte->i = 0;
+        dte->tv = false;
+        dte->v = false;
+        dte->i = false;
  
          amd_iommu_flush_device(iommu, req_id);
  
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-defs.h
@@ -107,57 +107,60 @@
  #define IOMMU_DEV_TABLE_INT_CONTROL_FORWARDED 0x1
  #define IOMMU_DEV_TABLE_INT_CONTROL_TRANSLATED        0x2
  
+/* For now we always allocate maximum possible interrupt remapping tables. */
+#define IOMMU_INTREMAP_LENGTH                  0xB
+
  struct amd_iommu_dte {
      /* 0 - 63 */
-    uint64_t v:1;
-    uint64_t tv:1;
-    uint64_t reserved0:5;
-    uint64_t had:2;
-    uint64_t paging_mode:3;
+    bool v:1;
+    bool tv:1;
+    unsigned int :5;
+    unsigned int had:2;
+    unsigned int paging_mode:3;
      uint64_t pt_root:40;
-    uint64_t ppr:1;
-    uint64_t gprp:1;
-    uint64_t giov:1;
-    uint64_t gv:1;
-    uint64_t glx:2;
-    uint64_t gcr3_trp_14_12:3;
-    uint64_t ir:1;
-    uint64_t iw:1;
-    uint64_t reserved1:1;
+    bool ppr:1;
+    bool gprp:1;
+    bool giov:1;
+    bool gv:1;
+    unsigned int glx:2;
+    unsigned int gcr3_trp_14_12:3;
+    bool ir:1;
+    bool iw:1;
+    unsigned int :1;
  
      /* 64 - 127 */
-    uint64_t domain_id:16;
-    uint64_t gcr3_trp_30_15:16;
-    uint64_t i:1;
-    uint64_t se:1;
-    uint64_t sa:1;
-    uint64_t ioctl:2;
-    uint64_t cache:1;
-    uint64_t sd:1;
-    uint64_t ex:1;
-    uint64_t sys_mgt:2;
-    uint64_t reserved2:1;
-    uint64_t gcr3_trp_51_31:21;
+    unsigned int domain_id:16;
+    unsigned int gcr3_trp_30_15:16;
+    bool i:1;
+    bool se:1;
+    bool sa:1;
+    unsigned int ioctl:2;
+    bool cache:1;
+    bool sd:1;
+    bool ex:1;
+    unsigned int sys_mgt:2;
+    unsigned int :1;
+    unsigned int gcr3_trp_51_31:21;
  
      /* 128 - 191 */
-    uint64_t iv:1;
-    uint64_t int_tab_len:4;
-    uint64_t ig:1;
+    bool iv:1;
+    unsigned int int_tab_len:4;
+    bool ig:1;
      uint64_t it_root:46;
-    uint64_t reserved3:4;
-    uint64_t init_pass:1;
-    uint64_t ext_int_pass:1;
-    uint64_t nmi_pass:1;
-    uint64_t reserved4:1;
-    uint64_t int_ctl:2;
-    uint64_t lint0_pass:1;
-    uint64_t lint1_pass:1;
+    unsigned int :4;
+    bool init_pass:1;
+    bool ext_int_pass:1;
+    bool nmi_pass:1;
+    unsigned int :1;
+    unsigned int int_ctl:2;
+    bool lint0_pass:1;
+    bool lint1_pass:1;
  
      /* 192 - 255 */
-    uint64_t reserved5:54;
-    uint64_t attr_v:1;
-    uint64_t mode0_fc:1;
-    uint64_t snoop_attr:8;
+    uint64_t :54;
+    bool attr_v:1;
+    bool mode0_fc:1;
+    unsigned int snoop_attr:8;
  };
  
  /* Command Buffer */
--- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
+++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h
@@ -73,14 +73,14 @@ int __must_check amd_iommu_flush_iotlb_a
  int get_dma_requestor_id(uint16_t seg, uint16_t bdf);
  void amd_iommu_set_intremap_table(struct amd_iommu_dte *dte,
                                    uint64_t intremap_ptr,
-                                  uint8_t int_valid);
+                                  bool valid);
  void amd_iommu_set_root_page_table(struct amd_iommu_dte *dte,
                                   uint64_t root_ptr, uint16_t domain_id,
-                                  uint8_t paging_mode, uint8_t valid);
+                                  uint8_t paging_mode, bool valid);
  void iommu_dte_add_device_entry(struct amd_iommu_dte *dte,
-                                struct ivrs_mappings *ivrs_dev);
+                                const struct ivrs_mappings *ivrs_dev);
  void iommu_dte_set_guest_cr3(struct amd_iommu_dte *dte, uint16_t dom_id,
-                             uint64_t gcr3_mfn, uint8_t gv, uint8_t glx);
+                             uint64_t gcr3_mfn, bool gv, uint8_t glx);
  
  /* send cmd to iommu */
  void amd_iommu_flush_all_pages(struct domain *d);

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