[xen stable-4.13] x86/PVH: PHYSDEVOP_pci_mmcfg_reserved should not blindly register a region

[patchbot@xxxxxxx]

commit d61fef6c411362876337fd4f473fbdef67ed00a5
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jun 24 16:25:29 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jun 24 16:25:29 2020 +0200

    x86/PVH: PHYSDEVOP_pci_mmcfg_reserved should not blindly register a region
    
    The op has a "is reserved" flag, and hence registration shouldn't
    happen unilaterally.
    
    Fixes: eb3dd90e4089 ("x86/physdev: enable PHYSDEVOP_pci_mmcfg_reserved for 
PVH Dom0")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    master commit: b539eeffc737d859dd1814c2e529e0ed0feba7a7
    master date: 2020-05-14 07:53:55 +0200
---
 xen/arch/x86/physdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index 3a3c15890b..23465bcd00 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -556,7 +556,7 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) 
arg)
 
         ret = pci_mmcfg_reserved(info.address, info.segment,
                                  info.start_bus, info.end_bus, info.flags);
-        if ( !ret && has_vpci(currd) )
+        if ( !ret && has_vpci(currd) && (info.flags & XEN_PCI_MMCFG_RESERVED) )
         {
             /*
              * For HVM (PVH) domains try to add the newly found MMCFG to the
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.13