[PATCH RFC 03/44] x86/pv: Rename invalidate_shadow_ldt() to pv_destroy_ldt()

[Andrew Cooper <andrew.cooper3@citrix.com>]

and move it into pv/descriptor-tables.c beside its GDT counterpart.  Reduce
the !in_irq() check from a BUG_ON() to ASSERT().

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
v2:
 * New
---
 xen/arch/x86/mm.c                   | 51 ++++---------------------------------
 xen/arch/x86/pv/descriptor-tables.c | 42 ++++++++++++++++++++++++++++--
 xen/include/asm-x86/pv/mm.h         |  3 +++
 3 files changed, 48 insertions(+), 48 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index a56f875..14cfa93 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -125,6 +125,7 @@
 
 #include <asm/hvm/grant_table.h>
 #include <asm/pv/grant_table.h>
+#include <asm/pv/mm.h>
 
 #include "pv/mm.h"
 
@@ -544,48 +545,6 @@ static inline void set_tlbflush_timestamp(struct page_info *page)
 const char __section(".bss.page_aligned.const") __aligned(PAGE_SIZE)
     zero_page[PAGE_SIZE];
 
-/*
- * Flush the LDT, dropping any typerefs.  Returns a boolean indicating whether
- * mappings have been removed (i.e. a TLB flush is needed).
- */
-static bool invalidate_shadow_ldt(struct vcpu *v)
-{
-    l1_pgentry_t *pl1e;
-    unsigned int i, mappings_dropped = 0;
-    struct page_info *page;
-
-    BUG_ON(unlikely(in_irq()));
-
-    spin_lock(&v->arch.pv_vcpu.shadow_ldt_lock);
-
-    if ( v->arch.pv_vcpu.shadow_ldt_mapcnt == 0 )
-        goto out;
-
-    pl1e = pv_ldt_ptes(v);
-
-    for ( i = 0; i < 16; i++ )
-    {
-        if ( !(l1e_get_flags(pl1e[i]) & _PAGE_PRESENT) )
-            continue;
-
-        page = l1e_get_page(pl1e[i]);
-        l1e_write(&pl1e[i], l1e_empty());
-        mappings_dropped++;
-
-        ASSERT_PAGE_IS_TYPE(page, PGT_seg_desc_page);
-        ASSERT_PAGE_IS_DOMAIN(page, v->domain);
-        put_page_and_type(page);
-    }
-
-    ASSERT(v->arch.pv_vcpu.shadow_ldt_mapcnt == mappings_dropped);
-    v->arch.pv_vcpu.shadow_ldt_mapcnt = 0;
-
- out:
-    spin_unlock(&v->arch.pv_vcpu.shadow_ldt_lock);
-
-    return mappings_dropped;
-}
-
 
 static int alloc_segdesc_page(struct page_info *page)
 {
@@ -1242,7 +1201,7 @@ void put_page_from_l1e(l1_pgentry_t l1e, struct domain *l1e_owner)
         {
             for_each_vcpu ( pg_owner, v )
             {
-                if ( invalidate_shadow_ldt(v) )
+                if ( pv_destroy_ldt(v) )
                     flush_tlb_mask(v->vcpu_dirty_cpumask);
             }
         }
@@ -2825,7 +2784,7 @@ int new_guest_cr3(mfn_t mfn)
             return rc;
         }
 
-        invalidate_shadow_ldt(curr); /* Unconditional TLB flush later. */
+        pv_destroy_ldt(curr); /* Unconditional TLB flush later. */
         write_ptbase(curr);
 
         return 0;
@@ -2861,7 +2820,7 @@ int new_guest_cr3(mfn_t mfn)
         return rc;
     }
 
-    invalidate_shadow_ldt(curr); /* Unconditional TLB flush later. */
+    pv_destroy_ldt(curr); /* Unconditional TLB flush later. */
 
     if ( !VM_ASSIST(d, m2p_strict) && !paging_mode_refcounts(d) )
         fill_ro_mpt(mfn);
@@ -3368,7 +3327,7 @@ long do_mmuext_op(
             else if ( (curr->arch.pv_vcpu.ldt_ents != ents) ||
                       (curr->arch.pv_vcpu.ldt_base != ptr) )
             {
-                if ( invalidate_shadow_ldt(curr) )
+                if ( pv_destroy_ldt(curr) )
                     flush_tlb_local();
 
                 curr->arch.pv_vcpu.ldt_base = ptr;
diff --git a/xen/arch/x86/pv/descriptor-tables.c b/xen/arch/x86/pv/descriptor-tables.c
index d1c4296..b418bbb 100644
--- a/xen/arch/x86/pv/descriptor-tables.c
+++ b/xen/arch/x86/pv/descriptor-tables.c
@@ -31,9 +31,47 @@
 #undef page_to_mfn
 #define page_to_mfn(pg) _mfn(__page_to_mfn(pg))
 
-/*******************
- * Descriptor Tables
+/*
+ * Flush the LDT, dropping any typerefs.  Returns a boolean indicating whether
+ * mappings have been removed (i.e. a TLB flush is needed).
  */
+bool pv_destroy_ldt(struct vcpu *v)
+{
+    l1_pgentry_t *pl1e;
+    unsigned int i, mappings_dropped = 0;
+    struct page_info *page;
+
+    ASSERT(!in_irq());
+
+    spin_lock(&v->arch.pv_vcpu.shadow_ldt_lock);
+
+    if ( v->arch.pv_vcpu.shadow_ldt_mapcnt == 0 )
+        goto out;
+
+    pl1e = pv_ldt_ptes(v);
+
+    for ( i = 0; i < 16; i++ )
+    {
+        if ( !(l1e_get_flags(pl1e[i]) & _PAGE_PRESENT) )
+            continue;
+
+        page = l1e_get_page(pl1e[i]);
+        l1e_write(&pl1e[i], l1e_empty());
+        mappings_dropped++;
+
+        ASSERT_PAGE_IS_TYPE(page, PGT_seg_desc_page);
+        ASSERT_PAGE_IS_DOMAIN(page, v->domain);
+        put_page_and_type(page);
+    }
+
+    ASSERT(v->arch.pv_vcpu.shadow_ldt_mapcnt == mappings_dropped);
+    v->arch.pv_vcpu.shadow_ldt_mapcnt = 0;
+
+ out:
+    spin_unlock(&v->arch.pv_vcpu.shadow_ldt_lock);
+
+    return mappings_dropped;
+}
 
 void pv_destroy_gdt(struct vcpu *v)
 {
diff --git a/xen/include/asm-x86/pv/mm.h b/xen/include/asm-x86/pv/mm.h
index 5d2fe4c..246b990 100644
--- a/xen/include/asm-x86/pv/mm.h
+++ b/xen/include/asm-x86/pv/mm.h
@@ -29,6 +29,7 @@ long pv_set_gdt(struct vcpu *v, unsigned long *frames, unsigned int entries);
 void pv_destroy_gdt(struct vcpu *v);
 
 bool pv_map_ldt_shadow_page(unsigned int off);
+bool pv_destroy_ldt(struct vcpu *v);
 
 #else
 
@@ -48,6 +49,8 @@ static inline long pv_set_gdt(struct vcpu *v, unsigned long *frames,
 static inline void pv_destroy_gdt(struct vcpu *v) { ASSERT_UNREACHABLE(); }
 
 static inline bool pv_map_ldt_shadow_page(unsigned int off) { return false; }
+static inline bool pv_destroy_ldt(struct vcpu *v)
+{ ASSERT_UNREACHABLE(); return false; }
 
 #endif
 
-- 
2.1.4


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