[Xen-changelog] [xen-4.0-testing] xenpaging: Add a check to Xen for EPT.

["Xen patchbot-4.0-testing" <patchbot-4.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1280765875 -3600
# Node ID 6a0a88e35278e0d68ed273751af7328dcfa03a6d
# Parent  b782ca7d09e8b20723ca11082173e255a38bbd39
xenpaging: Add a check to Xen for EPT.

There isn't seem to be a way to directly check for EPT, so instead
check for HAP and an Intel processor. If EPT isn't enabled, then
return an error to the tool.

Signed-off-by: Patrick Colp <pjcolp@xxxxxxxxx>
xen-unstable changeset:   21882:af52102e4dcf
xen-unstable date:        Wed Jul 28 07:54:40 2010 +0100
---
 xen/arch/x86/mm/mem_event.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r b782ca7d09e8 -r 6a0a88e35278 xen/arch/x86/mm/mem_event.c
--- a/xen/arch/x86/mm/mem_event.c       Mon Aug 02 17:11:33 2010 +0100
+++ b/xen/arch/x86/mm/mem_event.c       Mon Aug 02 17:17:55 2010 +0100
@@ -21,6 +21,7 @@
  */
 
 
+#include <asm/domain.h>
 #include <xen/event.h>
 #include <asm/p2m.h>
 #include <asm/mem_event.h>
@@ -225,6 +226,12 @@ int mem_event_domctl(struct domain *d, x
             mfn_t ring_mfn;
             mfn_t shared_mfn;
 
+            /* Currently only EPT is supported */
+            rc = -ENODEV;
+            if ( !(is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled &&
+                  (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)) )
+                break;
+
             /* Get MFN of ring page */
             guest_get_eff_l1e(v, ring_addr, &l1e);
             gfn = l1e_get_pfn(l1e);

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