[Xen-changelog] SVM patch to ensure that PAE bit is set for 32bit guests on 32bit PAE,

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID d580da01ded797f217754557be932b1e3ec8bdc5
# Parent  75f8e9c4e483d60b93f403b7b72dfe1bd37043bd
SVM patch to ensure that PAE bit is set for 32bit guests on 32bit PAE,
by using paging levels>=3 rather than ifdef i386.  This patch fixes
the "black screen" hang issue when building w/XEN_TARGET_X86_PAE=y on
32bit.

Tested linux debian and win2003EE guests with pae=1.  The linux
guest boots without error, while the windows guest sometimes hits a
bug() in shadow.c.  Both VT and SVM encounter the same bug.

Signed-off-by: Tom Woller <thomas.woller@xxxxxxx>

diff -r 75f8e9c4e483 -r d580da01ded7 xen/include/asm-x86/hvm/svm/vmcb.h
--- a/xen/include/asm-x86/hvm/svm/vmcb.h        Thu Apr 20 15:45:09 2006 +0100
+++ b/xen/include/asm-x86/hvm/svm/vmcb.h        Thu Apr 20 17:02:42 2006 +0100
@@ -473,10 +473,10 @@ enum {
 #define VMCB_EFLAGS_RESERVED_1          0x00000002 /* bitmap for 1 */
 
 /* These bits in the CR4 are owned by the host */
-#ifdef __i386__
-#define SVM_CR4_HOST_MASK (0)
+#if CONFIG_PAGING_LEVELS >= 3
+#define SVM_CR4_HOST_MASK (X86_CR4_PAE)
 #else
-#define SVM_CR4_HOST_MASK (X86_CR4_PAE)
+#define SVM_CR4_HOST_MASK 0
 #endif
 
 

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