The H_SIGNAL_SYS_RESET hcall allows a guest CPU to raise a system
reset exception on other CPUs in the same guest.
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
hw/ppc/spapr_hcall.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/hw/ppc/spapr.h | 8 +++++++-
2 files changed, 49 insertions(+), 1 deletion(-)
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index c5e7e8c..5ae84f0 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -880,6 +880,47 @@ static target_ulong h_set_mode(PowerPCCPU *cpu,
sPAPRMachineState *spapr,
return ret;
}
+static void do_sys_reset(CPUState *cs, void *arg)
+{
+ cpu_synchronize_state(cs);
+ ppc_cpu_do_system_reset(cs);
+}
+
+static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,
+ sPAPRMachineState *spapr,
+ target_ulong opcode, target_ulong *args)
+{
+ target_long target = args[0];
+ CPUState *cs;
+
+ if (target < H_SIGNAL_SYS_RESET_ALLBUTSELF) {
+ return H_PARAMETER;
+ }
+
+ CPU_FOREACH(cs) {
+ PowerPCCPU *c = POWERPC_CPU(cs);
+
+ if (cpu->cpu_dt_id == target) {
+ run_on_cpu(cs, do_sys_reset, NULL);
+ return H_SUCCESS;
+ }
+
+ if (target == H_SIGNAL_SYS_RESET_ALLBUTSELF) {
+ if (c == cpu) {
+ continue;
+ }
+ }
+
+ run_on_cpu(cs, do_sys_reset, NULL);
+ }
+
+ if (target >= 0) {
+ return H_PARAMETER;
+ }
+
+ return H_SUCCESS;
+}
+
/*
* Return the offset to the requested option vector @vector in the
* option vector table @table.
@@ -1113,6 +1154,7 @@ static void hypercall_register_types(void)
/* hcall-splpar */
spapr_register_hypercall(H_REGISTER_VPA, h_register_vpa);
spapr_register_hypercall(H_CEDE, h_cede);
+ spapr_register_hypercall(H_SIGNAL_SYS_RESET, h_signal_sys_reset);
/* processor register resource access h-calls */
spapr_register_hypercall(H_SET_SPRG0, h_set_sprg0);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index aeaba3e..a28538b 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -339,7 +339,13 @@ struct sPAPRMachineState {
#define H_XIRR_X 0x2FC
#define H_RANDOM 0x300
#define H_SET_MODE 0x31C
-#define MAX_HCALL_OPCODE H_SET_MODE
+#define H_SIGNAL_SYS_RESET 0x380
+#define MAX_HCALL_OPCODE H_SIGNAL_SYS_RESET
+
+/* Parameters to H_SIGNAL_SYS_RESET */
+#define H_SIGNAL_SYS_RESET_ALL -1
+#define H_SIGNAL_SYS_RESET_ALLBUTSELF -2
+
/* The hcalls above are standardized in PAPR and implemented by pHyp
* as well.
--
2.9.3
