From: Tim Deegan <Tim.Deegan@xensource.com>
Date: Thu, 20 Sep 2007 09:54:52 +0000 (+0100)
Subject: [HVM] iommu p2m ops: check guest is translated, and maintain m2p consistency
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14937^2~57
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https://%22%22/%22http:/www.example.com/cgi/%22https:/%22%22?a=commitdiff_plain;h=93e7d8905aa01a036462bff15933b88f3f3da2d9;p=xen.git

[HVM] iommu p2m ops: check guest is translated, and maintain m2p consistency
Signed-off-by: Tim Deegan <Tim.Deegan@xensource.com>
---

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 5569cbe632..a241d7cbb3 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -873,6 +873,18 @@ int
 set_mmio_p2m_entry(struct domain *d, unsigned long gfn, mfn_t mfn)
 {
     int rc = 0;
+    p2m_type_t ot;
+    mfn_t omfn;
+
+    if ( !paging_mode_translate(d) )
+        return 0;
+
+    omfn = gfn_to_mfn(d, gfn, &ot);
+    if ( p2m_is_ram(ot) )
+    {
+        ASSERT(mfn_valid(omfn));
+        set_gpfn_from_mfn(mfn_x(omfn), INVALID_M2P_ENTRY);
+    }
 
     rc = set_p2m_entry(d, gfn, mfn, p2m_mmio_direct);
     if ( 0 == rc )
@@ -886,8 +898,11 @@ int
 clear_mmio_p2m_entry(struct domain *d, unsigned long gfn)
 {
     int rc = 0;
-
     unsigned long mfn;
+
+    if ( !paging_mode_translate(d) )
+        return 0;
+
     mfn = gmfn_to_mfn(d, gfn);
     if ( INVALID_MFN == mfn )
     {