patch-0002-efi-Ensure-incorrectly-typed-runtime-services-get-ma.patch

From 33fa77dbef61c0aa803b993bce5901ec569a0fcc Mon Sep 17 00:00:00 2001
From: Ross Lagerwall <ross.lagerwall@citrix.com>
Date: Fri, 20 Mar 2015 14:32:04 +0000
Subject: [PATCH 2/2] efi: Ensure incorrectly typed runtime services get mapped

Some firmware implementations do not correctly mark memory needed for runtime
services, not setting the EFI_MEMORY_RUNTIME bit and giving it a type
EfiReservedMemoryType.  Even though EfiReservedMemoryType is not supposed to be
used by the firmware, map these regions so that runtime services work.

The failing firmware implementations were:
    Product Name: PowerEdge R720
    Vendor: Dell Inc.
    Version: 2.1.2
    Release Date: 09/19/2013
    BIOS Revision: 2.1

    Product Name: PowerEdge R320
    Vendor: Dell Inc.
    Version: 1.5.2
    Release Date: 03/11/2013
    BIOS Revision: 1.5

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 6e410fb..77100c9 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -97,6 +97,7 @@ static SIMPLE_TEXT_OUTPUT_INTERFACE *__initdata StdErr;
 
 static UINT32 __initdata mdesc_ver;
 static bool_t __initdata map_bs;
+static bool_t __initdata map_res = 1;
 
 static struct file __initdata cfg;
 static struct file __initdata kernel;
@@ -1296,7 +1297,9 @@ void __init efi_init_memory(void)
              (!(desc->Attribute & EFI_MEMORY_RUNTIME) &&
               (!map_bs ||
                (desc->Type != EfiBootServicesCode &&
-                desc->Type != EfiBootServicesData))) )
+                desc->Type != EfiBootServicesData)) &&
+              (!map_res ||
+               desc->Type != EfiReservedMemoryType)) )
             continue;
 
         desc->VirtualStart = INVALID_VIRTUAL_ADDRESS;