[Xen-changelog] [xen-unstable] [HVM] Only treat gfns in known MMIO regions as MMIO

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

# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
# Date 1172241847 0
# Node ID 2c3a13993b0d1c6b374e96c5a365fe615dca2f72
# Parent  eb3ebf11abfe06232495d5a1d2fc90b1ebafb9e2
[HVM] Only treat gfns in known MMIO regions as MMIO
instead of assuming that all non-RAM addresses are MMIO
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/multi.c |    3 ++-
 xen/include/asm-x86/p2m.h      |    6 +++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff -r eb3ebf11abfe -r 2c3a13993b0d xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c    Fri Feb 23 14:36:33 2007 +0000
+++ b/xen/arch/x86/mm/shadow/multi.c    Fri Feb 23 14:44:07 2007 +0000
@@ -2394,7 +2394,8 @@ static int validate_gl1e(struct vcpu *v,
     gfn = guest_l1e_get_gfn(*new_gl1e);
     gmfn = vcpu_gfn_to_mfn(v, gfn);
 
-    mmio = (is_hvm_vcpu(v) && paging_vcpu_mode_translate(v) && 
!mfn_valid(gmfn));
+    mmio = (is_hvm_vcpu(v) && paging_vcpu_mode_translate(v) && 
+            mmio_space(gfn_to_paddr(gfn)));
     l1e_propagate_from_guest(v, new_gl1e, _mfn(INVALID_MFN), gmfn, &new_sl1e, 
                              ft_prefetch, mmio);
     
diff -r eb3ebf11abfe -r 2c3a13993b0d xen/include/asm-x86/p2m.h
--- a/xen/include/asm-x86/p2m.h Fri Feb 23 14:36:33 2007 +0000
+++ b/xen/include/asm-x86/p2m.h Fri Feb 23 14:44:07 2007 +0000
@@ -86,11 +86,11 @@ static inline unsigned long get_mfn_from
     return mfn_x(gfn_to_mfn_current(pfn));
 }
 
-/* Is this guest address an mmio one? (i.e. not defined in p2m map) */
+/* Is this guest address an mmio one? */
 static inline int mmio_space(paddr_t gpa)
 {
-    unsigned long gfn = gpa >> PAGE_SHIFT;
-    return !mfn_valid(mfn_x(gfn_to_mfn_current(gfn)));
+    return (gpa >= 0xf0000000 /* 256MB hole just below 4GB */
+            || (gpa >= 0xa0000 && gpa < 0xc0000)); /* VGA hole */
 }
 
 /* Translate the frame number held in an l1e from guest to machine */

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