[Qemu-devel] [PATCH 2/9] acpi: ich9: add CPU hotplug handling to Q35 machine

[Igor Mammedov <imammedo@redhat.com>]

.. use IO port 0xcd8-0xcf7 range for CPU present bitmap

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 docs/specs/acpi_cpu_hotplug.txt |  4 +++-
 hw/acpi/ich9.c                  | 16 ++++++++++++++++
 include/hw/acpi/ich9.h          |  4 ++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/docs/specs/acpi_cpu_hotplug.txt b/docs/specs/acpi_cpu_hotplug.txt
index f6f5774..340b751 100644
--- a/docs/specs/acpi_cpu_hotplug.txt
+++ b/docs/specs/acpi_cpu_hotplug.txt
@@ -10,7 +10,9 @@ ACPI GPE block (IO ports 0xafe0-0xafe3, byte access):
 Generic ACPI GPE block. Bit 2 (GPE.2) used to notify CPU
 hot-add/remove event to ACPI BIOS, via SCI interrupt.
 
-CPU present bitmap (IO port 0xaf00-0xaf1f, 1-byte access):
+CPU present bitmap for:
+  ICH9-LPC (IO port 0x0cd8-0xcf7, 1-byte access)
+  PIIX-PM  (IO port 0xaf00-0xaf1f, 1-byte access)
 ---------------------------------------------------------------
 One bit per CPU. Bit position reflects corresponding CPU APIC ID.
 Read-only.
diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c
index 30f0df8..03dee35 100644
--- a/hw/acpi/ich9.c
+++ b/hw/acpi/ich9.c
@@ -44,6 +44,8 @@ do { printf("%s "fmt, __func__, ## __VA_ARGS__); } while (0)
 #define ICH9_DEBUG(fmt, ...)    do { } while (0)
 #endif
 
+#define ICH9_PROC_BASE 0x0CD8
+
 static void ich9_pm_update_sci_fn(ACPIREGS *regs)
 {
     ICH9LPCPMRegs *pm = container_of(regs, ICH9LPCPMRegs, acpi_regs);
@@ -185,6 +187,15 @@ static void pm_powerdown_req(Notifier *n, void *opaque)
     acpi_pm1_evt_power_down(&pm->acpi_regs);
 }
 
+static void ich9_cpu_added_req(Notifier *n, void *opaque)
+{
+    ICH9LPCPMRegs *pm = container_of(n, ICH9LPCPMRegs, cpu_added_notifier);
+
+    assert(pm != NULL);
+    AcpiCpuHotplug_add(&pm->acpi_regs.gpe, &pm->gpe_cpu, CPU(opaque));
+    acpi_update_sci(&pm->acpi_regs, pm->irq);
+}
+
 void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
                   qemu_irq sci_irq)
 {
@@ -210,6 +221,11 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
     qemu_register_reset(pm_reset, pm);
     pm->powerdown_notifier.notify = pm_powerdown_req;
     qemu_register_powerdown_notifier(&pm->powerdown_notifier);
+
+    AcpiCpuHotplug_init(pci_address_space_io(lpc_pci), OBJECT(lpc_pci),
+                        &pm->gpe_cpu, ICH9_PROC_BASE);
+    pm->cpu_added_notifier.notify = ich9_cpu_added_req;
+    qemu_register_cpu_added_notifier(&pm->cpu_added_notifier);
 }
 
 static void ich9_pm_get_gpe0_blk(Object *obj, Visitor *v,
diff --git a/include/hw/acpi/ich9.h b/include/hw/acpi/ich9.h
index 82fcf9f..104f419 100644
--- a/include/hw/acpi/ich9.h
+++ b/include/hw/acpi/ich9.h
@@ -22,6 +22,7 @@
 #define HW_ACPI_ICH9_H
 
 #include "hw/acpi/acpi.h"
+#include "hw/acpi/cpu_hotplug.h"
 
 typedef struct ICH9LPCPMRegs {
     /*
@@ -42,6 +43,9 @@ typedef struct ICH9LPCPMRegs {
 
     uint32_t pm_io_base;
     Notifier powerdown_notifier;
+
+    AcpiCpuHotplug gpe_cpu;
+    Notifier cpu_added_notifier;
 } ICH9LPCPMRegs;
 
 void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm,
-- 
1.8.4.2