From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Dom0 linux 4.0 + devel/for-linus-4.1 branch:
 p2m.c:884:d0v0 gfn_to_mfn failed! gfn=ffffffff001ed type:4
Date: Wed, 15 Apr 2015 16:58:50 -0400
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To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Stefan Bader <stefan.bader@canonical.com>, Andrew Cooper <andrew.cooper3@citrix.com>, David Vrabel <david.vrabel@citrix.com>, Jan Beulich <jbeulich@suse.com>, xen-devel <xen-devel@lists.xenproject.org>
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> Hi Konrad,
> 
> xen version is at last changeset 3a28f760508fb35c430edac17a9efde5aff6d1d5 
> (previous unstable master before the force push which includes 
> 1aeb1156fa43fe2cd2b5003995b20466cd19a622 which causes the trouble reported here:
> http://lists.xen.org/archives/html/xen-devel/2015-04/msg01336.html )
> 
> qemu-xen is at last changeset 727b998448e852a5e8eb570ac3a259ef62fbdacb 
> plus the revert of 7665d6ba98e20fb05c420de947c1750fd47e5c07 
> (due to other problem reported here: 
> http://lists.xen.org/archives/html/xen-devel/2015-04/msg01121.html )

You sure? I thought Andrew had an three line patch to fix that:

diff --git a/xen/drivers/passthrough/x86/iommu.c b/xen/drivers/passthrough/x86/iommu.c
index 9eb8d33..f4ab044 100644
--- a/xen/drivers/passthrough/x86/iommu.c
+++ b/xen/drivers/passthrough/x86/iommu.c
@@ -56,8 +56,9 @@ int arch_iommu_populate_page_table(struct domain *d)
 
     while ( !rc && (page = page_list_remove_head(&d->page_list)) )
     {
-        if ( has_hvm_container_domain(d) ||
-            (page->u.inuse.type_info & PGT_type_mask) == PGT_writable_page )
+        if ( (mfn_to_gmfn(d, page_to_mfn(page)) != INVALID_MFN) &&
+            (has_hvm_container_domain(d) ||
+             ((page->u.inuse.type_info & PGT_type_mask) == PGT_writable_page)) )
         {
             BUG_ON(SHARED_M2P(mfn_to_gmfn(d, page_to_mfn(page))));
             rc = hd->platform_ops->map_page(

?