[xen staging] x86: drop a bogus SHARED_M2P() check from PV Dom0 building code

[patchbot@xxxxxxx]

commit 604be1b333b1b66052ab9b0133f156890549a4f0
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Sep 22 16:19:21 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 22 16:19:21 2021 +0200

    x86: drop a bogus SHARED_M2P() check from PV Dom0 building code
    
    If anything, a check covering a wider range of invalid M2P entries ought
    to be used (e.g. VALID_M2P()). But since everything is fully under Xen's
    control at this stage, simply remove the BUG_ON().
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/pv/dom0_build.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index 77efd3918c..cb68da75c1 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -821,7 +821,6 @@ int __init dom0_construct_pv(struct domain *d,
     page_list_for_each ( page, &d->page_list )
     {
         mfn = mfn_x(page_to_mfn(page));
-        BUG_ON(SHARED_M2P(get_gpfn_from_mfn(mfn)));
         if ( get_gpfn_from_mfn(mfn) >= count )
         {
             BUG_ON(compat);
--
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