[Xen-changelog] [xen-unstable] Allow paged real mode during vmrun emulation.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User cegger
# Date 1298892109 -3600
# Node ID f9ba1b2ba93d1c168ce597c48681a7ac3434792e
# Parent  981397a3a586e66c957d82b553d8e5df47ed8dbf
Allow paged real mode during vmrun emulation.
Emulate cr0 and cr4 when guest does not intercept them.

Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
Acked-by: Eddie Dong <eddie.dong@xxxxxxxxx>
Acked-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Committed-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
---


diff -r 981397a3a586 -r f9ba1b2ba93d xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c    Mon Feb 28 12:21:46 2011 +0100
+++ b/xen/arch/x86/hvm/hvm.c    Mon Feb 28 12:21:49 2011 +0100
@@ -55,6 +55,7 @@
 #include <asm/hvm/support.h>
 #include <asm/hvm/cacheattr.h>
 #include <asm/hvm/trace.h>
+#include <asm/hvm/nestedhvm.h>
 #include <asm/mtrr.h>
 #include <asm/apic.h>
 #include <public/sched.h>
@@ -1335,7 +1336,8 @@
     /* ET is reserved and should be always be 1. */
     value |= X86_CR0_ET;
 
-    if ( (value & (X86_CR0_PE | X86_CR0_PG)) == X86_CR0_PG )
+    if ( !nestedhvm_vmswitch_in_progress(v) &&
+         (value & (X86_CR0_PE | X86_CR0_PG)) == X86_CR0_PG )
         goto gpf;
 
     if ( (value & X86_CR0_PG) && !(old_value & X86_CR0_PG) )

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