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[RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used
From: |
Julia Suvorova |
Subject: |
[RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used |
Date: |
Thu, 13 May 2021 08:26:39 +0200 |
Instead of changing the hot-plug type in _OSC register, do not
set the 'Hot-Plug Capable' flag. This way guest will choose ACPI
hot-plug if it is preferred and leave the option to use SHPC with
pcie-pci-bridge.
The ability to control hot-plug for each downstream port is retained,
while 'hotplug=off' on the port means all hot-plug types are disabled.
Signed-off-by: Julia Suvorova <jusual@redhat.com>
---
include/hw/boards.h | 1 +
hw/acpi/pcihp.c | 8 ++++++++
hw/core/machine.c | 19 +++++++++++++++++++
hw/i386/pc_q35.c | 8 ++++++++
hw/pci/pcie.c | 11 ++++++++++-
5 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 3d55d2bd62..a20ca5ab37 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -334,6 +334,7 @@ struct MachineState {
CpuTopology smp;
struct NVDIMMState *nvdimms_state;
struct NumaState *numa_state;
+ bool native_pci_hotplug;
};
#define DEFINE_MACHINE(namestr, machine_initfn) \
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 5355618608..7a6bc1b31e 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -31,6 +31,7 @@
#include "hw/pci/pci.h"
#include "hw/pci/pci_bridge.h"
#include "hw/pci/pci_host.h"
+#include "hw/pci/pcie_port.h"
#include "hw/i386/acpi-build.h"
#include "hw/acpi/acpi.h"
#include "hw/pci/pci_bus.h"
@@ -332,6 +333,13 @@ void acpi_pcihp_device_plug_cb(HotplugHandler
*hotplug_dev, AcpiPciHpState *s,
object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
PCIBus *sec = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
+ /* Remove all hot-plug handlers if hot-plug is disabled on slot */
+ if (object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT) &&
+ !PCIE_SLOT(pdev)->hotplug) {
+ qbus_set_hotplug_handler(BUS(sec), NULL);
+ return;
+ }
+
qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev));
/* We don't have to overwrite any other hotplug handler yet */
assert(QLIST_EMPTY(&sec->child));
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 1bf0e687b9..a3411f0e04 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -581,6 +581,21 @@ static void machine_set_memdev(Object *obj, const char
*value, Error **errp)
ms->ram_memdev_id = g_strdup(value);
}
+static void machine_set_native_pci_hotplug(Object *obj, bool value,
+ Error **errp)
+{
+ MachineState *ms = MACHINE(obj);
+
+ ms->native_pci_hotplug = value;
+}
+
+static bool machine_get_native_pci_hotplug(Object *obj, Error **errp)
+{
+ MachineState *ms = MACHINE(obj);
+
+ return ms->native_pci_hotplug;
+}
+
static void machine_init_notify(Notifier *notifier, void *data)
{
@@ -891,6 +906,10 @@ static void machine_class_init(ObjectClass *oc, void *data)
object_class_property_set_description(oc, "confidential-guest-support",
"Set confidential guest scheme to
support");
+ object_class_property_add_bool(oc, "x-native-pci-hotplug",
+ machine_get_native_pci_hotplug,
+ machine_set_native_pci_hotplug);
+
/* For compatibility */
object_class_property_add_str(oc, "memory-encryption",
machine_get_memory_encryption, machine_set_memory_encryption);
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 46a0f196f4..1059ebfdc7 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -136,6 +136,7 @@ static void pc_q35_init(MachineState *machine)
ram_addr_t lowmem;
DriveInfo *hd[MAX_SATA_PORTS];
MachineClass *mc = MACHINE_GET_CLASS(machine);
+ bool acpi_pcihp;
/* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory
* and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping
@@ -236,6 +237,13 @@ static void pc_q35_init(MachineState *machine)
object_property_set_link(OBJECT(machine), PC_MACHINE_ACPI_DEVICE_PROP,
OBJECT(lpc), &error_abort);
+ acpi_pcihp = object_property_get_bool(OBJECT(lpc),
+
"acpi-pci-hotplug-with-bridge-support",
+ NULL);
+
+ object_property_set_bool(OBJECT(machine), "x-native-pci-hotplug",
+ !acpi_pcihp, NULL);
+
/* irq lines */
gsi_state = pc_gsi_create(&x86ms->gsi, pcmc->pci_enabled);
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index fd0fa157e8..be331310c3 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -517,6 +517,9 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler
*hotplug_dev,
void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s)
{
uint32_t pos = dev->exp.exp_cap;
+ bool native_pcihp_enabled = object_property_get_bool(qdev_get_machine(),
+
"x-native-pci-hotplug",
+ NULL);
pci_word_test_and_set_mask(dev->config + pos + PCI_EXP_FLAGS,
PCI_EXP_FLAGS_SLOT);
@@ -529,7 +532,13 @@ void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s)
PCI_EXP_SLTCAP_PIP |
PCI_EXP_SLTCAP_AIP |
PCI_EXP_SLTCAP_ABP);
- if (s->hotplug) {
+
+ /*
+ * Enable native hot-plug on all hot-plugged bridges unless
+ * hot-plug is disabled on the slot.
+ */
+ if (s->hotplug &&
+ (native_pcihp_enabled || DEVICE(dev)->hotplugged)) {
pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP,
PCI_EXP_SLTCAP_HPS |
PCI_EXP_SLTCAP_HPC);
--
2.30.2
- [RFC PATCH v4 0/7] Use ACPI PCI hot-plug for Q35, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 2/7] hw/i386/acpi-build: Add ACPI PCI hot-plug methods to Q35, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used,
Julia Suvorova <=
- [RFC PATCH v4 3/7] hw/acpi/ich9: Enable ACPI PCI hot-plug, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 5/7] bios-tables-test: Allow changes in DSDT ACPI tables, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 6/7] hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 7/7] bios-tables-test: Update golden binaries, Julia Suvorova, 2021/05/13
- [RFC PATCH v4 1/7] hw/acpi/pcihp: Enhance acpi_pcihp_disable_root_bus() to support Q35, Julia Suvorova, 2021/05/13
- Re: [RFC PATCH v4 0/7] Use ACPI PCI hot-plug for Q35, Igor Mammedov, 2021/05/20