From: "Michael S. Tsirkin" <mst@redhat.com>
To: Ani Sinha <ani@anisinha.ca>
Cc: "Ani Sinha" <ani.sinha@nutanix.com>,
"Eduardo Habkost" <ehabkost@redhat.com>,
qemu-devel@nongnu.org,
"Aleksandar Markovic" <aleksandar.qemu.devel@gmail.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Igor Mammedov" <imammedo@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
"Aurelien Jarno" <aurelien@aurel32.net>,
"Richard Henderson" <rth@twiddle.net>
Subject: Re: [PATCH V2] Add a new PIIX option to control PCI hot unplugging of devices on non-root buses
Date: Tue, 28 Apr 2020 16:45:13 -0400 [thread overview]
Message-ID: <20200428164428-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CAARzgwwTo+r9xFge_XL_eu8-nsRFBFXEaQmTOhT1YHJifzfCJA@mail.gmail.com>
On Tue, Apr 28, 2020 at 10:10:18PM +0530, Ani Sinha wrote:
>
>
> On Tue, Apr 28, 2020 at 9:51 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Tue, Apr 28, 2020 at 09:39:16PM +0530, Ani Sinha wrote:
> >
> > Ani
> > On Apr 28, 2020, 21:35 +0530, Michael S. Tsirkin <mst@redhat.com>, wrote:
> >
> > On Tue, Apr 28, 2020 at 10:16:52AM +0000, Ani Sinha wrote:
> >
> > A new option "use_acpi_unplug" is introduced for PIIX which will
> > selectively only disable hot unplugging of both hot plugged and
> > cold plugged PCI devices on non-root PCI buses. This will prevent
> > hot unplugging of devices from Windows based guests from system
> > tray but will not prevent devices from being hot plugged into the
> > guest.
> >
> > It has been tested on Windows guests.
> >
> > Signed-off-by: Ani Sinha <ani.sinha@nutanix.com>
> >
> >
> > It's still a non starter until we find something similar for PCIE and
> > SHPC. Do guests check command status? Can some unplug commands fail?
> >
> >
> > Ok I give up! I thought we debated this on the other thread.
>
> Sorry to hear that.
> I'd rather you didn't, and worked on a solution that works for everyone.
>
>
> That is extremely hard for one person to do, without inputs and ideas from the
> community.
What kind of input are you looking for?
> Satisfying the entire world requires lot of time and energy
> investment, not to mention a broad expertise in multiple technologies.
>
>
>
> Pushing back on merging code is unfortunately the only mechanism
> maintainers have to make sure features are complete and
> orthogonal to each other, so I'm not sure I can help otherwise.
>
> >
> >
> >
> >
> > ---
> > hw/acpi/piix4.c | 3 +++
> > hw/i386/acpi-build.c | 40
> ++++++++++++++++++++++++++--------------
> > 2 files changed, 29 insertions(+), 14 deletions(-)
> >
> > diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> > index 964d6f5..59fa707 100644
> > --- a/hw/acpi/piix4.c
> > +++ b/hw/acpi/piix4.c
> > @@ -78,6 +78,7 @@ typedef struct PIIX4PMState {
> >
> > AcpiPciHpState acpi_pci_hotplug;
> > bool use_acpi_pci_hotplug;
> > + bool use_acpi_unplug;
> >
> > uint8_t disable_s3;
> > uint8_t disable_s4;
> > @@ -633,6 +634,8 @@ static Property piix4_pm_properties[] = {
> > DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
> > DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support",
> PIIX4PMState,
> > use_acpi_pci_hotplug, true),
> > + DEFINE_PROP_BOOL("acpi-pci-hotunplug-enable-bridge",
> PIIX4PMState,
> > + use_acpi_unplug, true),
> > DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
> > acpi_memory_hotplug.is_enabled, true),
> > DEFINE_PROP_END_OF_LIST(),
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index 23c77ee..71b3ac3 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -96,6 +96,7 @@ typedef struct AcpiPmInfo {
> > bool s3_disabled;
> > bool s4_disabled;
> > bool pcihp_bridge_en;
> > + bool pcihup_bridge_en;
> > uint8_t s4_val;
> > AcpiFadtData fadt;
> > uint16_t cpu_hp_io_base;
> > @@ -240,6 +241,9 @@ static void acpi_get_pm_info(MachineState
> *machine,
> > AcpiPmInfo *pm)
> > pm->pcihp_bridge_en =
> > object_property_get_bool(obj,
> "acpi-pci-hotplug-with-bridge-support",
> > NULL);
> > + pm->pcihup_bridge_en =
> > + object_property_get_bool(obj,
> "acpi-pci-hotunplug-enable-bridge",
> > + NULL);
> > }
> >
> > static void acpi_get_misc_info(AcpiMiscInfo *info)
> > @@ -451,7 +455,8 @@ static void build_append_pcihp_notify_entry
> (Aml
> > *method, int slot)
> > }
> >
> > static void build_append_pci_bus_devices(Aml *parent_scope,
> PCIBus
> > *bus,
> > - bool pcihp_bridge_en)
> > + bool pcihp_bridge_en,
> > + bool pcihup_bridge_en)
> > {
> > Aml *dev, *notify_method = NULL, *method;
> > QObject *bsel;
> > @@ -479,11 +484,14 @@ static void build_append_pci_bus_devices
> (Aml
> > *parent_scope, PCIBus *bus,
> > dev = aml_device("S%.02X", PCI_DEVFN(slot, 0));
> > aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
> > aml_append(dev, aml_name_decl("_ADR", aml_int(slot << 16)));
> > - method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > - aml_append(method,
> > - aml_call2("PCEJ", aml_name("BSEL"), aml_name("_SUN"))
> > - );
> > - aml_append(dev, method);
> > + if (pcihup_bridge_en || pci_bus_is_root(bus)) {
> > + method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > + aml_append(method,
> > + aml_call2("PCEJ", aml_name("BSEL"),
> > + aml_name("_SUN"))
> > + );
> > + aml_append(dev, method);
> > + }
> > aml_append(parent_scope, dev);
> >
> > build_append_pcihp_notify_entry(notify_method, slot);
> > @@ -537,12 +545,14 @@ static void build_append_pci_bus_devices
> (Aml
> > *parent_scope, PCIBus *bus,
> > /* add _SUN/_EJ0 to make slot hotpluggable */
> > aml_append(dev, aml_name_decl("_SUN", aml_int(slot)));
> >
> > - method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > - aml_append(method,
> > - aml_call2("PCEJ", aml_name("BSEL"), aml_name("_SUN"))
> > - );
> > - aml_append(dev, method);
> > -
> > + if (pcihup_bridge_en || pci_bus_is_root(bus)) {
> > + method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > + aml_append(method,
> > + aml_call2("PCEJ", aml_name("BSEL"),
> > + aml_name("_SUN"))
> > + );
> > + aml_append(dev, method);
> > + }
> > if (bsel) {
> > build_append_pcihp_notify_entry(notify_method, slot);
> > }
> > @@ -553,7 +563,8 @@ static void build_append_pci_bus_devices(Aml
> > *parent_scope, PCIBus *bus,
> > */
> > PCIBus *sec_bus = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
> >
> > - build_append_pci_bus_devices(dev, sec_bus, pcihp_bridge_en);
> > + build_append_pci_bus_devices(dev, sec_bus, pcihp_bridge_en,
> > + pcihup_bridge_en);
> > }
> > /* slot descriptor has been composed, add it into parent context
> */
> > aml_append(parent_scope, dev);
> > @@ -2196,7 +2207,8 @@ build_dsdt(GArray *table_data, BIOSLinker
> > *linker,
> > if (bus) {
> > Aml *scope = aml_scope("PCI0");
> > /* Scan all PCI buses. Generate tables to support hotplug. */
> > - build_append_pci_bus_devices(scope, bus, pm->pcihp_bridge_en);
> > + build_append_pci_bus_devices(scope, bus, pm->pcihp_bridge_en,
> > + pm->pcihup_bridge_en);
> >
> > if (TPM_IS_TIS_ISA(tpm)) {
> > if (misc->tpm_version == TPM_VERSION_2_0) {
> > --
> > 1.9.4
> >
> >
> >
>
>
next prev parent reply other threads:[~2020-04-28 20:53 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 10:16 [PATCH V2] Add a new PIIX option to control PCI hot unplugging of devices on non-root buses Ani Sinha
2020-04-28 10:20 ` Ani Sinha
2020-04-28 16:05 ` Michael S. Tsirkin
2020-04-28 16:09 ` Ani Sinha
2020-04-28 16:21 ` Michael S. Tsirkin
2020-04-28 16:40 ` Ani Sinha
2020-04-28 20:45 ` Michael S. Tsirkin [this message]
2020-04-29 0:58 ` Ani Sinha
2020-04-29 5:28 ` Michael S. Tsirkin
2020-04-29 5:59 ` Ani Sinha
2020-04-29 6:11 ` Ani Sinha
2020-04-29 6:52 ` Michael S. Tsirkin
2020-04-29 6:54 ` Ani Sinha
2020-04-29 6:57 ` Michael S. Tsirkin
2020-04-29 7:02 ` Ani Sinha
2020-04-29 7:38 ` Michael S. Tsirkin
2020-04-29 7:43 ` Ani Sinha
2020-04-29 8:09 ` Michael S. Tsirkin
2020-04-29 8:14 ` Ani Sinha
2020-04-29 8:56 ` Michael S. Tsirkin
2020-04-29 9:14 ` Ani Sinha
2020-04-29 9:18 ` Ani Sinha
2020-04-29 10:15 ` Michael S. Tsirkin
2020-04-29 10:20 ` Ani Sinha
2020-04-29 10:30 ` Michael S. Tsirkin
2020-04-29 10:37 ` Ani Sinha
2020-04-30 17:12 ` Ani Sinha
2020-04-28 16:28 ` Daniel P. Berrangé
2020-04-28 16:30 ` Michael S. Tsirkin
2020-04-28 16:33 ` Daniel P. Berrangé
2020-04-28 20:44 ` Michael S. Tsirkin
2020-05-11 18:53 ` Igor Mammedov
2020-05-12 5:26 ` Ani Sinha
2020-05-13 19:43 ` Igor Mammedov
2020-05-15 12:13 ` Ani Sinha
2020-05-20 9:43 ` Igor Mammedow
2020-05-20 9:47 ` Michael S. Tsirkin
2020-05-20 9:56 ` Igor Mammedow
2020-05-20 10:06 ` Daniel P. Berrangé
2020-05-20 11:29 ` Michael S. Tsirkin
2020-05-20 11:42 ` Daniel P. Berrangé
2020-05-20 11:44 ` Michael S. Tsirkin
2020-05-20 10:28 ` Michael S. Tsirkin
2020-05-20 11:05 ` Igor Mammedow
2020-05-20 11:23 ` Michael S. Tsirkin
2020-05-20 12:20 ` Igor Mammedow
2020-05-20 16:13 ` Michael S. Tsirkin
2020-05-21 7:32 ` Igor Mammedow
2020-05-21 10:07 ` Michael S. Tsirkin
2020-05-21 13:23 ` Igor Mammedov
2020-05-21 15:40 ` Laine Stump
2020-05-26 5:32 ` Ani Sinha
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