From: David Gibson <david@gibson.dropbear.id.au>
Date: Thu, 26 Mar 2020 05:27:37 +0000 (+1100)
Subject: spapr: Don't allow unplug of NVLink2 devices
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=05af7c77f5f24ef2bec25f2cab22170c29edaf37;p=qemu.git

spapr: Don't allow unplug of NVLink2 devices

Currently, we can't properly handle unplug of NVLink2 devices, because we
don't have code to tear down their special memory resources.  There's not
a lot of impetus to implement that: since hardware NVLink2 devices can't
be hot unplugged, the guest side drivers don't usually support unplug
anyway.

Therefore, simply prevent unplug of NVLink2 devices.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---

diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 55ca9dee1e..61b84a392d 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1665,6 +1665,10 @@ static void spapr_pci_unplug_request(HotplugHandler *plug_handler,
             error_setg(errp, "PCI: Hot unplug of PCI bridges not supported");
             return;
         }
+        if (object_property_get_uint(OBJECT(pdev), "nvlink2-tgt", NULL)) {
+            error_setg(errp, "PCI: Cannot unplug NVLink2 devices");
+            return;
+        }
 
         /* ensure any other present functions are pending unplug */
         if (PCI_FUNC(pdev->devfn) == 0) {