tree cfd24e45739eae21bd3f2a6b16134f6a553a4b3b
parent 587a7641d53055054d68d67d94c9408ef808f127
author Leonardo Bras <leobras@redhat.com> 1688619347 -0300
committer Michael S. Tsirkin <mst@redhat.com> 1689029972 -0400

pcie: Add hotplug detect state register to cmask

When trying to migrate a machine type pc-q35-6.0 or lower, with this
cmdline options,

-device driver=pcie-root-port,port=18,chassis=19,id=pcie-root-port18,bus=pcie.0,addr=0x12 \
-device driver=nec-usb-xhci,p2=4,p3=4,id=nex-usb-xhci0,bus=pcie-root-port18,addr=0x12.0x1

the following bug happens after all ram pages were sent:

qemu-kvm: get_pci_config_device: Bad config data: i=0x6e read: 0 device: 40 cmask: ff wmask: 0 w1cmask:19
qemu-kvm: Failed to load PCIDevice:config
qemu-kvm: Failed to load pcie-root-port:parent_obj.parent_obj.parent_obj
qemu-kvm: error while loading state for instance 0x0 of device '0000:00:12.0/pcie-root-port'
qemu-kvm: load of migration failed: Invalid argument

This happens on pc-q35-6.0 or lower because of:
{ "ICH9-LPC", ACPI_PM_PROP_ACPI_PCIHP_BRIDGE, "off" }

In this scenario, hotplug_handler_plug() calls pcie_cap_slot_plug_cb(),
which sets dev->config byte 0x6e with bit PCI_EXP_SLTSTA_PDS to signal PCI
hotplug for the guest. After a while the guest will deal with this hotplug
and qemu will clear the above bit.

Then, during migration, get_pci_config_device() will compare the
configs of both the freshly created device and the one that is being
received via migration, which will differ due to the PCI_EXP_SLTSTA_PDS bit
and cause the bug to reproduce.

To avoid this fake incompatibility, there are tree fields in PCIDevice that
can help:

- wmask: Used to implement R/W bytes, and
- w1cmask: Used to implement RW1C(Write 1 to Clear) bytes
- cmask: Used to enable config checks on load.

According to PCI Express® Base Specification Revision 5.0 Version 1.0,
table 7-27 (Slot Status Register) bit 6, the "Presence Detect State" is
listed as RO (read-only), so it only makes sense to make use of the cmask
field.

So, clear PCI_EXP_SLTSTA_PDS bit on cmask, so the fake incompatibility on
get_pci_config_device() does not abort the migration.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2215819
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Message-Id: <20230706045546.593605-3-leobras@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>