Revert "x86/mce: handle reserved domain ID in XEN_MC_msrinject"

This reverts commit 55dc7f6126.

The get_maintainer.pl script showed Jan as the maintainer so I pushed
this patch. But in fact according to MAINTAINERS file, he's not.  Revert
this patch and wait until a maintainer acks it.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>

tools/tests/mce-test/tools/xen-mceinj.c

@@ -317,10 +317,7 @@ static int inject_mci_addr(xc_interface *xc_handle,
                            domid_t domid)
 {
     return add_msr_bank_intpose(xc_handle, cpu_nr,
-                                MC_MSRINJ_F_INTERPOSE |
-                                ((domid >= DOMID_FIRST_RESERVED &&
-                                  domid != DOMID_SELF) ?
-                                 0 : MC_MSRINJ_F_GPADDR),
+                                MC_MSRINJ_F_INTERPOSE | MC_MSRINJ_F_GPADDR,
                                 MCi_type_ADDR, bank, val, domid);
 }
 

xen/arch/x86/cpu/mcheck/mce.c

@@ -1427,7 +1427,6 @@ long do_mca(XEN_GUEST_HANDLE_PARAM(xen_mc_t) u_xen_mc)
 
         if ( mc_msrinject->mcinj_flags & MC_MSRINJ_F_GPADDR )
         {
-            domid_t domid;
             struct domain *d;
             struct mcinfo_msr *msr;
             unsigned int i;
@@ -1435,17 +1434,10 @@ long do_mca(XEN_GUEST_HANDLE_PARAM(xen_mc_t) u_xen_mc)
             unsigned long gfn, mfn;
             p2m_type_t t;
 
-            domid = (mc_msrinject->mcinj_domid == DOMID_SELF) ?
-                    current->domain->domain_id : mc_msrinject->mcinj_domid;
-            if ( domid >= DOMID_FIRST_RESERVED )
-                return x86_mcerr("do_mca inject: incompatible flag "
-                                 "MC_MSRINJ_F_GPADDR with domain %d",
-                                 -EINVAL, domid);
-
-            d = get_domain_by_id(domid);
+            d = get_domain_by_id(mc_msrinject->mcinj_domid);
             if ( d == NULL )
                 return x86_mcerr("do_mca inject: bad domain id %d",
-                                 -EINVAL, domid);
+                                 -EINVAL, mc_msrinject->mcinj_domid);
 
             for ( i = 0, msr = &mc_msrinject->mcinj_msr[0];
                   i < mc_msrinject->mcinj_count;
@@ -1460,7 +1452,7 @@ long do_mca(XEN_GUEST_HANDLE_PARAM(xen_mc_t) u_xen_mc)
                     put_gfn(d, gfn);
                     put_domain(d);
                     return x86_mcerr("do_mca inject: bad gfn %#lx of domain %d",
-                                     -EINVAL, gfn, domid);
+                                     -EINVAL, gfn, mc_msrinject->mcinj_domid);
                 }
 
                 msr->value = pfn_to_paddr(mfn) | (gaddr & (PAGE_SIZE - 1));