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Re: [RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is use
From: |
Igor Mammedov |
Subject: |
Re: [RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used |
Date: |
Thu, 20 May 2021 16:14:18 +0200 |
On Thu, 13 May 2021 08:26:39 +0200
Julia Suvorova <jusual@redhat.com> wrote:
> 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);
how about replacing of q35_machine -> machine -> qdev_get_machine() with
PCIESlot::enable_native_hotplug property
and then in pc_q35_init() just adding compat/global property at runtime
if(acpi_hotplug)
object_register_sugar_prop(TYPE_PCIE_ROOT_PORT, "enable_native_hotplug",
"false", true);
after that every port created will have that property set automatically.
or something like this.
It's also hackish but a bit better as you don't have pollute generic machine
code with "x-native-pci-hotplug" and don't have to call qdev_get_machine() for
every port.
> 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);
- [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, 2021/05/13
- Re: [RFC PATCH v4 4/7] hw/pci/pcie: Do not set HPC flag if acpihp is used,
Igor Mammedov <=
- [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
- Re: [RFC PATCH v4 0/7] Use ACPI PCI hot-plug for Q35, Michael S. Tsirkin, 2021/05/23