From: Hongyan Xia <hongyax@amazon.com>
Date: Wed, 9 Oct 2019 13:54:23 +0000 (+0100)
Subject: x86/setup: do not map memory when passing to allocators
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=refs%2Fheads%2Fdirectnonmap-v2.3;p=people%2Fhx242%2Fxen.git

x86/setup: do not map memory when passing to allocators

Also destroy the existing mappings to the direct map region when passing
to allocators.

Signed-off-by: Hongyan Xia <hongyax@amazon.com>
---

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index e6d8dfb0b3..6a664d16c2 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1346,6 +1346,10 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
         /* Pass mapped memory to allocator /before/ creating new mappings. */
         init_boot_pages(s, min(map_s, e));
+#ifndef CONFIG_DIRECTMAP
+        destroy_xen_mappings((unsigned long)__va(s),
+                             (unsigned long)__va(min(map_s, e)));
+#endif
         s = map_s;
         if ( s < map_e )
         {
@@ -1354,6 +1358,10 @@ void __init noreturn __start_xen(unsigned long mbi_p)
             map_s = (s + mask) & ~mask;
             map_e &= ~mask;
             init_boot_pages(map_s, map_e);
+#ifndef CONFIG_DIRECTMAP
+            destroy_xen_mappings((unsigned long)__va(map_s),
+                                 (unsigned long)__va(map_e));
+#endif
         }
 
         if ( map_s > map_e )
@@ -1367,12 +1375,15 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
             if ( map_e < end )
             {
+#ifdef CONFIG_DIRECTMAP
                 map_pages_to_xen((unsigned long)__va(map_e), maddr_to_mfn(map_e),
                                  PFN_DOWN(end - map_e), PAGE_HYPERVISOR);
+#endif
                 init_boot_pages(map_e, end);
                 map_e = end;
             }
         }
+#ifdef CONFIG_DIRECTMAP
         if ( map_e < e )
         {
             /* This range must not be passed to the boot allocator and
@@ -1380,10 +1391,13 @@ void __init noreturn __start_xen(unsigned long mbi_p)
             map_pages_to_xen((unsigned long)__va(map_e), maddr_to_mfn(map_e),
                              PFN_DOWN(e - map_e), __PAGE_HYPERVISOR_RW);
         }
+#endif
         if ( s < map_s )
         {
+#ifdef CONFIG_DIRECTMAP
             map_pages_to_xen((unsigned long)__va(s), maddr_to_mfn(s),
                              PFN_DOWN(map_s - s), PAGE_HYPERVISOR);
+#endif
             init_boot_pages(s, map_s);
         }
     }