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pci: acpi hotplug: rename x-native-hotplug to x-do-not-expose-native-hotplug-cap

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When ACPI PCI hotplug for Q35 was introduced (6.1), it was implemented
by hiding HPC capability on PCIE slot. That however led to a number of
regressions and to fix it, it was decided to keep HPC cap exposed
in ACPI PCI hotplug case and force guest in ACPI PCI hotplug mode
by other means [1].

That reduced meaning of x-native-hotplug to a compat knob [2] for
broken 6.1 machine type.
Rename property to match its current purpose.

1) 211afe5c69 (hw/i386/acpi-build: Deny control on PCIe Native Hot-plug in _OSC)
2) c318bef762 (hw/acpi/ich9: Add compat prop to keep HPC bit set for 6.1 machine type)

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230112140312.3096331-10-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2023-01-12 15:02:41 +01:00 • committed by Michael S. Tsirkin
parent f7b35824b1
commit 1d77e15718
5 changed files with 16 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

6
hw/pci/pcie.c
View file

@ -611,11 +611,11 @@ void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s)
PCI_EXP_SLTCAP_ABP);
/*
* Enable native hot-plug on all hot-plugged bridges unless
* hot-plug is disabled on the slot.
* Expose native hot-plug on all bridges if hot-plug is enabled on the slot.
* (unless broken 6.1 ABI is enforced for compat reasons)
*/
if (s->hotplug &&
(s->native_hotplug || DEVICE(dev)->hotplugged)) {
(!s->hide_native_hotplug_cap || DEVICE(dev)->hotplugged)) {
pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP,
PCI_EXP_SLTCAP_HPS |
PCI_EXP_SLTCAP_HPC);