[Xen-devel] [PATCH v5 01/10] 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>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
v5: IOMMU_INTREMAP_LENGTH -> IOMMU_INTREMAP_ORDER. Adjust comment.
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_ORDER)
 
 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_ORDER;
+    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 the maximum: 2048 entries. */
+#define IOMMU_INTREMAP_ORDER                   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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