On 4/27/20 9:24 PM, Julia Suvorova wrote:
Raise an error when trying to hot-plug/unplug a device through QMP to a device
with disabled hot-plug capability. This makes the device behaviour more
consistent and provides an explanation of the failure in the case of
asynchronous unplug.

Signed-off-by: Julia Suvorova <jus...@redhat.com>
---
v2:
     * Change error text [Igor, Michael]
     * Move cleanup to a separate patch [Marcel]

  hw/pci/pcie.c | 19 +++++++++++++++++++
  1 file changed, 19 insertions(+)

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 0eb3a2a5d2..6b48d04d2c 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -415,6 +415,7 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, 
DeviceState *dev,
  {
      PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
      uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
+    uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
      PCIDevice *pci_dev = PCI_DEVICE(dev);
/* Don't send event when device is enabled during qemu machine creation:
@@ -430,6 +431,13 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, 
DeviceState *dev,
          return;
      }
+ /* Check if hot-plug is disabled on the slot */
+    if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
+        error_setg(errp, "Hot-plug failed: unsupported by the port device 
'%s'",
+                         DEVICE(hotplug_pdev)->id);
+        return;
+    }
+
      /* To enable multifunction hot-plug, we just ensure the function
       * 0 added last. When function 0 is added, we set the sltsta and
       * inform OS via event notification.
@@ -470,6 +478,17 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler 
*hotplug_dev,
      Error *local_err = NULL;
      PCIDevice *pci_dev = PCI_DEVICE(dev);
      PCIBus *bus = pci_get_bus(pci_dev);
+    PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
+    uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
+    uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
+
+    /* Check if hot-unplug is disabled on the slot */
+    if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
+        error_setg(errp, "Hot-unplug failed: "
+                         "unsupported by the port device '%s'",
+                         DEVICE(hotplug_pdev)->id);
+        return;
+    }
pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, &local_err);
      if (local_err) {

Reviewed-by: Marcel Apfelbaum <marcel.apfelb...@gmail.com>

Thanks,
Marcel


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