qemu-ppc
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH] spapr: Don't allow unplug of NVLink2 devices


From: Philippe Mathieu-Daudé
Subject: Re: [PATCH] spapr: Don't allow unplug of NVLink2 devices
Date: Tue, 31 Mar 2020 09:56:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 3/31/20 5:27 AM, David Gibson wrote:
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.

Safe for 5.0, right?

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>


Signed-off-by: David Gibson <address@hidden>
---
  hw/ppc/spapr_pci.c | 4 ++++
  1 file changed, 4 insertions(+)

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) {





reply via email to

[Prev in Thread] Current Thread [Next in Thread]