[xen master] AMD/IOMMU: convert amd_iommu_pte from struct to union

[patchbot@xxxxxxx]

commit 73f62c7380edf07469581a3049aba98abd63b275
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 20 14:22:26 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 20 14:22:26 2020 +0200

    AMD/IOMMU: convert amd_iommu_pte from struct to union
    
    This is to add a "raw" counterpart to the bitfield equivalent. Take the
    opportunity and
     - convert fields to bool / unsigned int,
     - drop the naming of the reserved field,
     - shorten the names of the ignored ones.
    
    This is part of XSA-347.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu-defs.h    | 31 ++++++++++++++++-------------
 xen/drivers/passthrough/amd/iommu_map.c     | 12 +++++------
 xen/drivers/passthrough/amd/pci_amd_iommu.c |  4 ++--
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu-defs.h 
b/xen/drivers/passthrough/amd/iommu-defs.h
index 15eedfb678..56f385f270 100644
--- a/xen/drivers/passthrough/amd/iommu-defs.h
+++ b/xen/drivers/passthrough/amd/iommu-defs.h
@@ -451,20 +451,23 @@ union amd_iommu_x2apic_control {
 #define IOMMU_PAGE_TABLE_U32_PER_ENTRY (IOMMU_PAGE_TABLE_ENTRY_SIZE / 4)
 #define IOMMU_PAGE_TABLE_ALIGNMENT     4096
 
-struct amd_iommu_pte {
-    uint64_t pr:1;
-    uint64_t ignored0:4;
-    uint64_t a:1;
-    uint64_t d:1;
-    uint64_t ignored1:2;
-    uint64_t next_level:3;
-    uint64_t mfn:40;
-    uint64_t reserved:7;
-    uint64_t u:1;
-    uint64_t fc:1;
-    uint64_t ir:1;
-    uint64_t iw:1;
-    uint64_t ignored2:1;
+union amd_iommu_pte {
+    uint64_t raw;
+    struct {
+        bool pr:1;
+        unsigned int ign0:4;
+        bool a:1;
+        bool d:1;
+        unsigned int ign1:2;
+        unsigned int next_level:3;
+        uint64_t mfn:40;
+        unsigned int :7;
+        bool u:1;
+        bool fc:1;
+        bool ir:1;
+        bool iw:1;
+        unsigned int ign2:1;
+    };
 };
 
 /* Paging modes */
diff --git a/xen/drivers/passthrough/amd/iommu_map.c 
b/xen/drivers/passthrough/amd/iommu_map.c
index 0cb948d114..050eca838b 100644
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -34,7 +34,7 @@ static unsigned int pfn_to_pde_idx(unsigned long pfn, 
unsigned int level)
 static unsigned int clear_iommu_pte_present(unsigned long l1_mfn,
                                             unsigned long dfn)
 {
-    struct amd_iommu_pte *table, *pte;
+    union amd_iommu_pte *table, *pte;
     unsigned int flush_flags;
 
     table = map_domain_page(_mfn(l1_mfn));
@@ -48,7 +48,7 @@ static unsigned int clear_iommu_pte_present(unsigned long 
l1_mfn,
     return flush_flags;
 }
 
-static unsigned int set_iommu_pde_present(struct amd_iommu_pte *pte,
+static unsigned int set_iommu_pde_present(union amd_iommu_pte *pte,
                                           unsigned long next_mfn,
                                           unsigned int next_level, bool iw,
                                           bool ir)
@@ -83,7 +83,7 @@ static unsigned int set_iommu_pte_present(unsigned long 
pt_mfn,
                                           int pde_level,
                                           bool iw, bool ir)
 {
-    struct amd_iommu_pte *table, *pde;
+    union amd_iommu_pte *table, *pde;
     unsigned int flush_flags;
 
     table = map_domain_page(_mfn(pt_mfn));
@@ -174,7 +174,7 @@ void iommu_dte_set_guest_cr3(struct amd_iommu_dte *dte, 
uint16_t dom_id,
 static int iommu_pde_from_dfn(struct domain *d, unsigned long dfn,
                               unsigned long pt_mfn[], bool map)
 {
-    struct amd_iommu_pte *pde, *next_table_vaddr;
+    union amd_iommu_pte *pde, *next_table_vaddr;
     unsigned long  next_table_mfn;
     unsigned int level;
     struct page_info *table;
@@ -448,7 +448,7 @@ int __init amd_iommu_quarantine_init(struct domain *d)
     unsigned long end_gfn =
         1ul << (DEFAULT_DOMAIN_ADDRESS_WIDTH - PAGE_SHIFT);
     unsigned int level = amd_iommu_get_paging_mode(end_gfn);
-    struct amd_iommu_pte *table;
+    union amd_iommu_pte *table;
 
     if ( hd->arch.amd.root_table )
     {
@@ -479,7 +479,7 @@ int __init amd_iommu_quarantine_init(struct domain *d)
 
         for ( i = 0; i < PTE_PER_TABLE_SIZE; i++ )
         {
-            struct amd_iommu_pte *pde = &table[i];
+            union amd_iommu_pte *pde = &table[i];
 
             /*
              * PDEs are essentially a subset of PTEs, so this function
diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c 
b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index 304363f5d2..e5f8762c5c 100644
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -495,7 +495,7 @@ static void amd_dump_p2m_table_level(struct page_info* pg, 
int level,
                                      paddr_t gpa, int indent)
 {
     paddr_t address;
-    struct amd_iommu_pte *table_vaddr;
+    const union amd_iommu_pte *table_vaddr;
     int index;
 
     if ( level < 1 )
@@ -511,7 +511,7 @@ static void amd_dump_p2m_table_level(struct page_info* pg, 
int level,
 
     for ( index = 0; index < PTE_PER_TABLE_SIZE; index++ )
     {
-        struct amd_iommu_pte *pde = &table_vaddr[index];
+        const union amd_iommu_pte *pde = &table_vaddr[index];
 
         if ( !(index % 2) )
             process_pending_softirqs();
--
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