[xen staging] xen/virtual-region: Rename the start/end fields

[patchbot@xxxxxxx]

commit 989556c6f8ca080f5f202417af97d1188b9ba52a
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Mar 5 11:28:33 2024 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Thu Mar 7 14:24:42 2024 +0000

    xen/virtual-region: Rename the start/end fields
    
    ... to text_{start,end}.  We're about to introduce another start/end pair.
    
    Despite it's name, struct virtual_region has always been a module-ish
    description.  Call this out specifically.
    
    As minor cleanup, replace ROUNDUP(x, PAGE_SIZE) with the more concise
    PAGE_ALIGN() ahead of duplicating the example.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 xen/common/livepatch.c           |  4 ++--
 xen/common/virtual_region.c      | 19 ++++++++++---------
 xen/include/xen/virtual_region.h | 11 +++++++++--
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 5a7d5b7be0..888beb2732 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -785,8 +785,8 @@ static int prepare_payload(struct payload *payload,
     region = &payload->region;
 
     region->symbols_lookup = livepatch_symbols_lookup;
-    region->start = payload->text_addr;
-    region->end = payload->text_addr + payload->text_size;
+    region->text_start = payload->text_addr;
+    region->text_end = payload->text_addr + payload->text_size;
 
     /* Optional sections. */
     for ( i = 0; i < BUGFRAME_NR; i++ )
diff --git a/xen/common/virtual_region.c b/xen/common/virtual_region.c
index cefef3e47e..b74030d700 100644
--- a/xen/common/virtual_region.c
+++ b/xen/common/virtual_region.c
@@ -11,15 +11,15 @@
 
 static struct virtual_region core = {
     .list = LIST_HEAD_INIT(core.list),
-    .start = _stext,
-    .end = _etext,
+    .text_start = _stext,
+    .text_end = _etext,
 };
 
 /* Becomes irrelevant when __init sections are cleared. */
 static struct virtual_region core_init __initdata = {
     .list = LIST_HEAD_INIT(core_init.list),
-    .start = _sinittext,
-    .end = _einittext,
+    .text_start = _sinittext,
+    .text_end = _einittext,
 };
 
 /*
@@ -39,7 +39,8 @@ const struct virtual_region *find_text_region(unsigned long 
addr)
     rcu_read_lock(&rcu_virtual_region_lock);
     list_for_each_entry_rcu ( iter, &virtual_region_list, list )
     {
-        if ( (void *)addr >= iter->start && (void *)addr < iter->end )
+        if ( (void *)addr >= iter->text_start &&
+             (void *)addr <  iter->text_end )
         {
             region = iter;
             break;
@@ -88,8 +89,8 @@ void relax_virtual_region_perms(void)
 
     rcu_read_lock(&rcu_virtual_region_lock);
     list_for_each_entry_rcu( region, &virtual_region_list, list )
-        modify_xen_mappings_lite((unsigned long)region->start,
-                                 ROUNDUP((unsigned long)region->end, 
PAGE_SIZE),
+        modify_xen_mappings_lite((unsigned long)region->text_start,
+                                 PAGE_ALIGN((unsigned long)region->text_end),
                                  PAGE_HYPERVISOR_RWX);
     rcu_read_unlock(&rcu_virtual_region_lock);
 }
@@ -100,8 +101,8 @@ void tighten_virtual_region_perms(void)
 
     rcu_read_lock(&rcu_virtual_region_lock);
     list_for_each_entry_rcu( region, &virtual_region_list, list )
-        modify_xen_mappings_lite((unsigned long)region->start,
-                                 ROUNDUP((unsigned long)region->end, 
PAGE_SIZE),
+        modify_xen_mappings_lite((unsigned long)region->text_start,
+                                 PAGE_ALIGN((unsigned long)region->text_end),
                                  PAGE_HYPERVISOR_RX);
     rcu_read_unlock(&rcu_virtual_region_lock);
 }
diff --git a/xen/include/xen/virtual_region.h b/xen/include/xen/virtual_region.h
index d053620711..442a45bf1f 100644
--- a/xen/include/xen/virtual_region.h
+++ b/xen/include/xen/virtual_region.h
@@ -9,11 +9,18 @@
 #include <xen/list.h>
 #include <xen/symbols.h>
 
+/*
+ * Despite it's name, this is a module(ish) description.
+ *
+ * There's one region for the runtime .text/etc, one region for .init during
+ * boot only, and one region per livepatch.
+ */
 struct virtual_region
 {
     struct list_head list;
-    const void *start;                /* Virtual address start. */
-    const void *end;                  /* Virtual address end. */
+
+    const void *text_start;                /* .text virtual address start. */
+    const void *text_end;                  /* .text virtual address end. */
 
     /* If this is NULL the default lookup mechanism is used. */
     symbols_lookup_t *symbols_lookup;
--
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