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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
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7
hw/pci-bridge/gen_pcie_root_port.c
View file

@ -87,7 +87,12 @@ static void gen_rp_realize(DeviceState *dev, Error **errp)
return;
}
if (grp->res_reserve.io == -1 && s->hotplug && !s->native_hotplug) {
/*
* reserving IO space led to worse issues in 6.1, when this hunk was
* introduced. (see commit: 211afe5c69b59). Keep this broken for 6.1
* machine type ABI compatibility only
*/
if (s->hide_native_hotplug_cap && grp->res_reserve.io == -1 && s->hotplug) {
grp->res_reserve.io = GEN_PCIE_ROOT_DEFAULT_IO_RANGE;
}
int rc = pci_bridge_qemu_reserve_cap_init(d, 0,