ShuriZma
/
xemu
mirror of https://github.com/xemu-project/xemu.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

s390x/pci: Unplug remaining requested devices on pcihost reset 

When resetting the guest we should unplug and remove all devices that
are still pending.

With this patch, the requested device will be unplugged on reboot
(S390_RESET_EXTERNAL and S390_RESET_REIPL, which reset the pcihost bridge
via qemu_devices_reset()).

This approach is similar to what's done for acpi PCI hotplug in
acpi_pcihp_reset() -> acpi_pcihp_update() ->
acpi_pcihp_update_hotplug_bus() -> acpi_pcihp_eject_slot().

s390_pci_generate_plug_event()'s will still be generated, I guess this
is not an issue. The same thing would happen right now when unplugging
a device just before starting the guest.

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190130155733.32742-7-david@redhat.com>
Reviewed-by: Collin Walling <walling@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2019-01-30 16:57:33 +01:00 committed by Cornelia Huck
parent 703fef6fcf
commit 2313a88fe6
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
hw/s390x/s390-pci-bus.c
View File

@ -1093,6 +1093,21 @@ static void s390_pcihost_reset(DeviceState *dev)
{
S390pciState *s = S390_PCI_HOST_BRIDGE(dev);
PCIBus *bus = s->parent_obj.bus;
S390PCIBusDevice *pbdev, *next;
/* Process all pending unplug requests */
QTAILQ_FOREACH_SAFE(pbdev, &s->zpci_devs, link, next) {
if (pbdev->unplug_requested) {
if (pbdev->summary_ind) {
pci_dereg_irqs(pbdev);
}
if (pbdev->iommu->enabled) {
pci_dereg_ioat(pbdev->iommu);
}
pbdev->state = ZPCI_FS_STANDBY;
s390_pci_perform_unplug(pbdev);
}
}
/*
* When resetting a PCI bridge, the assigned numbers are set to 0. So