Dear seL4 devs and community,
I had made VMM work well on my platform(armv8, six A55 cpus, RAM is 8G) based on vm_multi with Linux Guest OS(vm0.num_vcpus = 4;) and Android Guest OS(vm1.num_vcpus = 6;).
But I meet an error(vm_vppi_event_handler@vm.c:97 VPPI IRQ 27 dropped on vcpu 3) when I enable SMP support with -DNUM_NODES=6.
Actually, VPPI IRQ 27 dropped on some vcpu number is not fixed, maybe 1 or 2 or 3.
Once this error appears, it will brush the screen crazily, the recurrence rate is about 10%.
1.Some logs are added for debugging this issue:
--- a/seL4_projects_libs/libsel4vmmplatsupport/src/arch/arm/psci.c
+++ b/seL4_projects_libs/libsel4vmmplatsupport/src/arch/arm/psci.c
@@ -53,18 +53,24 @@ int handle_psci(vm_vcpu_t *vcpu, seL4_Word fn_number, bool convention)
uintptr_t target_cpu = smc_get_arg(®s, 1);
uintptr_t entry_point_address = smc_get_arg(®s, 2);
uintptr_t context_id = smc_get_arg(®s, 3);
+ printf("[hjl] handle_psci target_cpu:%d\n", target_cpu);
vm_vcpu_t *target_vcpu = vm_vcpu_for_target_cpu(vcpu->vm, target_cpu);
if (target_vcpu == NULL) {
target_vcpu = vm_find_free_unassigned_vcpu(vcpu->vm);
if (target_vcpu && start_new_vcpu(target_vcpu, entry_point_address, context_id, target_cpu) == 0) {
+ printf("[hjl] handle_psci vm:%p vcpu_id:%d on success\n", vcpu->vm, target_vcpu->vcpu_id);
smc_set_return_value(®s, PSCI_SUCCESS);
} else {
+ printf("[hjl] handle_psci vm:%p vcpu_id:%d on failure\n", vcpu->vm, target_vcpu->vcpu_id);
smc_set_return_value(®s, PSCI_INTERNAL_FAILURE);
}
} else {
if (is_vcpu_online(target_vcpu)) {
+ printf("[hjl] handle_psci vm:%p target_cpu is online\n", vcpu->vm);
smc_set_return_value(®s, PSCI_ALREADY_ON);
} else {
+ printf("[hjl] handle_psci vm:%p target_cpu is not online\n", vcpu->vm);
smc_set_return_value(®s, PSCI_INTERNAL_FAILURE);
}
}
--- a/seL4_projects_libs/libsel4vm/src/arch/arm/vgic/vgic.c
+++ b/seL4_projects_libs/libsel4vm/src/arch/arm/vgic/vgic.c
@@ -570,6 +570,9 @@ static int vgic_dist_enable_irq(struct vgic_dist_device *d, vm_vcpu_t *vcpu, int
vgic = vgic_device_get_vgic(d);
DDIST("enabling irq %d\n", irq);
set_enable(gic_dist, irq, true, vcpu->vcpu_id);
+ if (irq == 27) {
+ printf("[hjl] enabling irq:%d on vcpu:%d\n", irq, vcpu->vcpu_id);
+ }
virq_data = virq_find_irq_data(vgic, vcpu, irq);
if (virq_data) {
/* STATE b) */
@@ -619,6 +622,7 @@ static int vgic_dist_set_pending_irq(struct vgic_dist_device *d, vm_vcpu_t *vcpu
return err;
} else {
+ printf("[hjl] virq_data:%p, gic_dist->enable:%d, is_enabled:%d\n", virq_data, gic_dist->enable, is_enabled(gic_dist, irq, vcpu->vcpu_id));
/* No further action */
DDIST("IRQ not enabled (%d) on vcpu %d\n", irq, vcpu->vcpu_id);
return -1;
}
2.The detailed log is as follows:
[hjl] enabling irq 27, vcpu->vcpu_id:0
[hjl] handle_psci target_cpu:256
[hjl] handle_psci vm:0x1584bbb0 vcpu_id:1 on success
[hjl] enabling irq 27, vcpu->vcpu_id:1
[hjl] handle_psci target_cpu:512
[hjl] handle_psci vm:0x1584bbb0 vcpu_id:2 on success
[hjl] enabling irq 27, vcpu->vcpu_id:2
[hjl] handle_psci target_cpu:768
[hjl] handle_psci vm:0x1584bbb0 vcpu_id:3 on success
[hjl] enabling irq 27, vcpu->vcpu_id:3
[hjl] enabling irq 27, vcpu->vcpu_id:0
[hjl] handle_psci target_cpu:256
[hjl] handle_psci vm:0x1584fbb0 vcpu_id:1 on success
[hjl] enabling irq 27, vcpu->vcpu_id:1
[hjl] handle_psci target_cpu:512
[hjl] handle_psci vm:0x1584fbb0 vcpu_id:2 on success
[hjl] enabling irq 27, vcpu->vcpu_id:2
[hjl] handle_psci target_cpu:768
[hjl] handle_psci vm:0x1584fbb0 vcpu_id:3 on success
[hjl] enabling irq 27, vcpu->vcpu_id:3
[hjl] IRQ not enabled (27) on vcpu 3 virq_data:0x15794ad0, gic_dist->enable:1, is_enabled:0
vm_vppi_event_handler@vm.c:97 VPPI IRQ 27 dropped on vcpu 3
[hjl] IRQ not enabled (27) on vcpu 3 virq_data:0x15794ad0, gic_dist->enable:1, is_enabled:0
vm_vppi_event_handler@vm.c:97 VPPI IRQ 27 dropped on vcpu 3
......
3.Present situation:
At present, I tracked and found that secondary cpus has been on by Host, but Guest OS's secondary_start_kernel function seem like not excuted.
Does anyone know what caused it?
BR.
Allen
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