EFI: don't convert memory marked for runtime use to ordinary RAM

efi_init_memory() in both relevant places is treating EFI_MEMORY_RUNTIME
higher priority than the type of the range. To avoid accessing memory at
runtime which was re-used for other purposes, make
efi_arch_process_memory_map() follow suit. While in theory the same would
apply to EfiACPIReclaimMemory, we don't actually "reclaim" or clobber
that memory (converted to E820_ACPI on x86) there (and it would be a bug
if the Dom0 kernel tried to reclaim the range, bypassing Xen's memory
management, plus it would be at least bogus if it clobbered that space),
hence that type's handling can be left alone.

Fixes: bf6501a62e80 ("x86-64: EFI boot code")
Fixes: facac0af87ef ("x86-64: EFI runtime code")
Fixes: 6d70ea10d49f ("Add ARM EFI boot support")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
master commit: f324300c8347b6aa6f9c0b18e0a90bbf44011a9a
master date: 2022-10-21 12:30:24 +0200

diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index cf9c37153feafc2d1c65215a03579e0d689b11b3..37d7ebd59ae23835ef4710a32fb377698ab608b7 100644 (file)
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -149,7 +149,8 @@ static EFI_STATUS __init efi_process_memory_map_bootinfo(EFI_MEMORY_DESCRIPTOR *
 
     for ( Index = 0; Index < (mmap_size / desc_size); Index++ )
     {
-        if ( desc_ptr->Attribute & EFI_MEMORY_WB &&
+        if ( !(desc_ptr->Attribute & EFI_MEMORY_RUNTIME) &&
+             (desc_ptr->Attribute & EFI_MEMORY_WB) &&
              (desc_ptr->Type == EfiConventionalMemory ||
               desc_ptr->Type == EfiLoaderCode ||
               desc_ptr->Type == EfiLoaderData ||

diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h
index 84fd77931456d96c8921e6c174eb00401969f9b7..3c3b3ab936f460d70cb6c584b6b68f446bbf0f42 100644 (file)
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -183,7 +183,9 @@ static void __init efi_arch_process_memory_map(EFI_SYSTEM_TABLE *SystemTable,
             /* fall through */
         case EfiLoaderCode:
         case EfiLoaderData:
-            if ( desc->Attribute & EFI_MEMORY_WB )
+            if ( desc->Attribute & EFI_MEMORY_RUNTIME )
+                type = E820_RESERVED;
+            else if ( desc->Attribute & EFI_MEMORY_WB )
                 type = E820_RAM;
             else
         case EfiUnusableMemory: