feat(interrupts): introduce a new paravirtualized interface
This patch adds basic support for a new paravirtualized interface that
allows an SP to reconfigure an interrupt, it owns, in runtime. Further
patches will add the complete support.
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I45ad89d177da3303fc413f250e44e4c1ca1bf9dc
diff --git a/inc/hf/arch/plat/ffa.h b/inc/hf/arch/plat/ffa.h
index 2ea7e1a..d68ba60 100644
--- a/inc/hf/arch/plat/ffa.h
+++ b/inc/hf/arch/plat/ffa.h
@@ -372,3 +372,9 @@
int64_t plat_ffa_mailbox_writable_get(const struct vcpu *current);
int64_t plat_ffa_mailbox_waiter_get(ffa_id_t vm_id, const struct vcpu *current);
+
+/**
+ * Reconfigure the interrupt belonging to the current partition at runtime.
+ */
+int64_t plat_ffa_interrupt_reconfigure(uint32_t int_id, uint32_t command,
+ uint32_t value, struct vcpu *current);
diff --git a/inc/vmapi/hf/abi.h b/inc/vmapi/hf/abi.h
index 7f2ccde..dd9e698 100644
--- a/inc/vmapi/hf/abi.h
+++ b/inc/vmapi/hf/abi.h
@@ -21,6 +21,7 @@
#define HF_INTERRUPT_GET 0xff04
#define HF_INTERRUPT_INJECT 0xff05
#define HF_INTERRUPT_DEACTIVATE 0xff08
+#define HF_INTERRUPT_RECONFIGURE 0xff09
/* Custom FF-A-like calls returned from FFA_RUN. */
#define HF_FFA_RUN_WAIT_FOR_INTERRUPT 0xff06
diff --git a/src/arch/aarch64/hypervisor/handler.c b/src/arch/aarch64/hypervisor/handler.c
index 572c8b8..ab7f9a1 100644
--- a/src/arch/aarch64/hypervisor/handler.c
+++ b/src/arch/aarch64/hypervisor/handler.c
@@ -1065,6 +1065,11 @@
vcpu->regs.r[0] = plat_ffa_interrupt_deactivate(
args.arg1, args.arg2, vcpu);
break;
+
+ case HF_INTERRUPT_RECONFIGURE:
+ vcpu->regs.r[0] = plat_ffa_interrupt_reconfigure(
+ args.arg1, args.arg2, args.arg3, vcpu);
+ break;
#endif
default:
diff --git a/src/arch/aarch64/plat/ffa/spmc.c b/src/arch/aarch64/plat/ffa/spmc.c
index 99b8ff0..59bd11c 100644
--- a/src/arch/aarch64/plat/ffa/spmc.c
+++ b/src/arch/aarch64/plat/ffa/spmc.c
@@ -2770,3 +2770,36 @@
return -1;
}
+
+/**
+ * Reconfigure the interrupt belonging to the current partition at runtime.
+ */
+int64_t plat_ffa_interrupt_reconfigure(uint32_t int_id, uint32_t command,
+ uint32_t value, struct vcpu *current)
+{
+ struct vm *vm = current->vm;
+ struct vm_locked vm_locked;
+ int64_t ret = -1;
+ struct interrupt_descriptor *int_desc;
+
+ /*
+ * Lock VM to protect interrupt descriptor from being modified
+ * concurrently.
+ */
+ vm_locked = vm_lock(vm);
+
+ /* Check if the interrupt belongs to the current SP. */
+ int_desc = vm_find_interrupt_descriptor(vm_locked, int_id);
+
+ if (int_desc == NULL) {
+ dlog_verbose("Interrupt %x does not belong to current SP\n",
+ int_id);
+ goto out_unlock;
+ }
+
+ ret = 0;
+out_unlock:
+ vm_unlock(&vm_locked);
+
+ return ret;
+}