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hw/pci/pcie: Move hot plug capability check to pre_plug callback

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Check for hot plug capability earlier to avoid removing devices attached
during the initialization process.

Run qemu with an unattached drive:
  -drive file=$FILE,if=none,id=drive0 \
  -device pcie-root-port,id=rp0,slot=3,bus=pcie.0,hotplug=off
Hotplug a block device:
  device_add virtio-blk-pci,id=blk0,drive=drive0,bus=rp0
If hotplug fails on plug_cb, drive0 will be deleted.

Fixes: 0501e1aa1d ("hw/pci/pcie: Forbid hot-plug if it's disabled on the slot")

Acked-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Julia Suvorova <jusual@redhat.com>
Message-Id: <20200604125947.881210-1-jusual@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Julia Suvorova 2020-06-04 14:59:46 +02:00 committed by Michael S. Tsirkin
parent b963ea19f8
commit 0dabc0f654
1 changed files with 11 additions and 8 deletions
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19
hw/pci/pcie.c
View file

@ -407,6 +407,17 @@ static void pcie_cap_slot_plug_common(PCIDevice *hotplug_dev, DeviceState *dev,
void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
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-plug is disabled on the slot */
if (dev->hotplugged && (sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'",
DEVICE(hotplug_pdev)->id);
return;
}
pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, errp);
}
@ -415,7 +426,6 @@ 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:
@ -431,13 +441,6 @@ 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.