[PATCH RFC V3 08/29] arm/virt: Init PMU at host for all possible vcpus

[Salil Mehta]

PMU for all possible vCPUs must be initialized at the VM initialization time.
Refactor existing code to accomodate possible vCPUs. This also assumes that all
processor being used are identical.

Past discussion for reference:
Link: https://lists.gnu.org/archive/html/qemu-devel/2020-06/msg00131.html

Co-developed-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
 hw/arm/virt.c         | 12 ++++++++----
 include/hw/arm/virt.h |  1 +
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index ac53bfadca..57ec429022 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2045,12 +2045,14 @@ static void finalize_gic_version(VirtMachineState *vms)
  */
 static void virt_cpu_post_init(VirtMachineState *vms, MemoryRegion *sysmem)
 {
+    CPUArchIdList *possible_cpus = vms->parent.possible_cpus;
     int max_cpus = MACHINE(vms)->smp.max_cpus;
-    bool aarch64, pmu, steal_time;
+    bool aarch64, steal_time;
     CPUState *cpu;
+    int n;
 
     aarch64 = object_property_get_bool(OBJECT(first_cpu), "aarch64", NULL);
-    pmu = object_property_get_bool(OBJECT(first_cpu), "pmu", NULL);
+    vms->pmu = object_property_get_bool(OBJECT(first_cpu), "pmu", NULL);
     steal_time = object_property_get_bool(OBJECT(first_cpu),
                                           "kvm-steal-time", NULL);
 
@@ -2077,8 +2079,10 @@ static void virt_cpu_post_init(VirtMachineState *vms, 
MemoryRegion *sysmem)
             memory_region_add_subregion(sysmem, pvtime_reg_base, pvtime);
         }
 
-        CPU_FOREACH(cpu) {
-            if (pmu) {
+        for (n = 0; n < possible_cpus->len; n++) {
+            cpu = qemu_get_possible_cpu(n);
+
+            if (vms->pmu) {
                 assert(arm_feature(&ARM_CPU(cpu)->env, ARM_FEATURE_PMU));
                 if (kvm_irqchip_in_kernel()) {
                     kvm_arm_pmu_set_irq(ARM_CPU(cpu), VIRTUAL_PMU_IRQ);
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 36ac5ff4a2..d8dcc89a0d 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -155,6 +155,7 @@ struct VirtMachineState {
     bool ras;
     bool mte;
     bool dtb_randomness;
+    bool pmu;
     OnOffAuto acpi;
     VirtGICType gic_version;
     VirtIOMMUType iommu;
-- 
2.34.1