From 028d71744dfeedabfa67d629c71a6ed5e494cc68 Mon Sep 17 00:00:00 2001
From: Salil Mehta <salil.mehta@huawei.com>
Date: Tue, 29 Aug 2023 00:47:05 +0000
Subject: [PATCH] arm/virt: Create GED dev before *disabled* CPU Objs are
 destroyed

ACPI CPU hotplug state (is_present=_STA.PRESENT, is_enabled=_STA.ENABLED) for
all the possible vCPUs MUST be initialized during machine init. This is done
during the creation of the GED device. VMM/Qemu MUST expose/fake the ACPI state
of the disabled vCPUs to the Guest kernel as 'present' (_STA.PRESENT) always
i.e. ACPI persistent. if the 'disabled' vCPU objectes are destroyed before the
GED device has been created then their ACPI hotplug state might not get
initialized correctly as acpi_persistent flag is part of the CPUState. This will
expose wrong status of the unplugged vCPUs to the Guest kernel.

Hence, moving the GED device creation before disabled vCPU objects get destroyed
as part of the post CPU init routine.

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
 hw/arm/virt.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 155000f22f..818398e753 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2472,6 +2472,12 @@ static void machvirt_init(MachineState *machine)
 
     create_gic(vms, sysmem);
 
+    has_ged = has_ged && aarch64 && firmware_loaded &&
+              virt_is_acpi_enabled(vms);
+    if (has_ged) {
+        vms->acpi_dev = create_acpi_ged(vms);
+    }
+
     virt_cpu_post_init(vms, sysmem);
 
     fdt_add_pmu_nodes(vms);
@@ -2496,9 +2502,7 @@ static void machvirt_init(MachineState *machine)
 
     create_pcie(vms);
 
-    if (has_ged && aarch64 && firmware_loaded && virt_is_acpi_enabled(vms)) {
-        vms->acpi_dev = create_acpi_ged(vms);
-    } else {
+    if (!has_ged) {
         create_gpio_devices(vms, VIRT_GPIO, sysmem);
     }
 
-- 
2.27.0