[PATCH v5 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used

From: Julia Suvorova <jusual@redhat.com>
To: qemu-devel@nongnu.org
Cc: Igor Mammedov <imammedo@redhat.com>,
	Julia Suvorova <jusual@redhat.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
Subject: [PATCH v5 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used
Date: Thu, 17 Jun 2021 21:07:36 +0200	[thread overview]
Message-ID: <20210617190739.3673064-5-jusual@redhat.com> (raw)
In-Reply-To: <20210617190739.3673064-1-jusual@redhat.com>

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/pci/pcie_port.h |  5 ++++-
 hw/acpi/pcihp.c            |  8 ++++++++
 hw/core/machine.c          |  1 -
 hw/i386/pc_q35.c           | 11 +++++++++++
 hw/pci/pcie.c              |  8 +++++++-
 hw/pci/pcie_port.c         |  1 +
 6 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/include/hw/pci/pcie_port.h b/include/hw/pci/pcie_port.h
index bea8ecad0f..e25b289ce8 100644
--- a/include/hw/pci/pcie_port.h
+++ b/include/hw/pci/pcie_port.h
@@ -57,8 +57,11 @@ struct PCIESlot {
     /* Disable ACS (really for a pcie_root_port) */
     bool        disable_acs;
 
-    /* Indicates whether hot-plug is enabled on the slot */
+    /* Indicates whether any type of hot-plug is allowed on the slot */
     bool        hotplug;
+
+    bool        native_hotplug;
+
     QLIST_ENTRY(PCIESlot) next;
 };
 
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 55b9bc7817..6ed0575d81 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -582,7 +582,6 @@ static void machine_set_memdev(Object *obj, const char *value, Error **errp)
     ms->ram_memdev_id = g_strdup(value);
 }
 
-
 static void machine_init_notify(Notifier *notifier, void *data)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 46a0f196f4..a0ec7964cc 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -37,6 +37,7 @@
 #include "sysemu/kvm.h"
 #include "hw/kvm/clock.h"
 #include "hw/pci-host/q35.h"
+#include "hw/pci/pcie_port.h"
 #include "hw/qdev-properties.h"
 #include "hw/i386/x86.h"
 #include "hw/i386/pc.h"
@@ -136,6 +137,7 @@ 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 +238,15 @@ 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);
+
+    if (acpi_pcihp) {
+        object_register_sugar_prop(TYPE_PCIE_SLOT, "enable-native-hotplug",
+                                  "false", true);
+    }
+
     /* 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..6e95d82903 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -529,7 +529,13 @@ 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 &&
+        (s->native_hotplug || DEVICE(dev)->hotplugged)) {
         pci_long_test_and_set_mask(dev->config + pos + PCI_EXP_SLTCAP,
                                    PCI_EXP_SLTCAP_HPS |
                                    PCI_EXP_SLTCAP_HPC);
diff --git a/hw/pci/pcie_port.c b/hw/pci/pcie_port.c
index eb563ad435..a410111825 100644
--- a/hw/pci/pcie_port.c
+++ b/hw/pci/pcie_port.c
@@ -148,6 +148,7 @@ static Property pcie_slot_props[] = {
     DEFINE_PROP_UINT8("chassis", PCIESlot, chassis, 0),
     DEFINE_PROP_UINT16("slot", PCIESlot, slot, 0),
     DEFINE_PROP_BOOL("hotplug", PCIESlot, hotplug, true),
+    DEFINE_PROP_BOOL("enable-native-hotplug", PCIESlot, native_hotplug, true),
     DEFINE_PROP_END_OF_LIST()
 };
 
-- 
2.30.2


