From f03496bc123df4d5a595fd4aa2113786c313e41e Mon Sep 17 00:00:00 2001 From: Aravinda Prasad Date: Fri, 31 Jan 2020 00:14:21 +0530 Subject: ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls This patch adds support in QEMU to handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls. The machine check notification address is saved when the OS issues "ibm,nmi-register" RTAS call. This patch also handles the case when multiple processors experience machine check at or about the same time by handling "ibm,nmi-interlock" call. In such cases, as per PAPR, subsequent processors serialize waiting for the first processor to issue the "ibm,nmi-interlock" call. The second processor that also received a machine check error waits till the first processor is done reading the error log. The first processor issues "ibm,nmi-interlock" call when the error log is consumed. Signed-off-by: Aravinda Prasad [Register fwnmi RTAS calls in core_rtas_register_types() where other RTAS calls are registered] Signed-off-by: Ganesh Goudar Message-Id: <20200130184423.20519-6-ganeshgr@linux.ibm.com> Signed-off-by: David Gibson --- hw/ppc/spapr_rtas.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) (limited to 'hw/ppc/spapr_rtas.c') diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 89b7eb6..35d9126 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -399,6 +399,61 @@ static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, rtas_st(rets, 1, 100); } +static void rtas_ibm_nmi_register(PowerPCCPU *cpu, + SpaprMachineState *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + hwaddr rtas_addr; + + if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) == SPAPR_CAP_OFF) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + rtas_addr = spapr_get_rtas_addr(); + if (!rtas_addr) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + spapr->guest_machine_check_addr = rtas_ld(args, 1); + rtas_st(rets, 0, RTAS_OUT_SUCCESS); +} + +static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, + SpaprMachineState *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) == SPAPR_CAP_OFF) { + rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); + return; + } + + if (spapr->guest_machine_check_addr == -1) { + /* NMI register not called */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + if (spapr->mc_status != cpu->vcpu_id) { + /* The vCPU that hit the NMI should invoke "ibm,nmi-interlock" */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + return; + } + + /* + * vCPU issuing "ibm,nmi-interlock" is done with NMI handling, + * hence unset mc_status. + */ + spapr->mc_status = -1; + qemu_cond_signal(&spapr->mc_delivery_cond); + rtas_st(rets, 0, RTAS_OUT_SUCCESS); +} + static struct rtas_call { const char *name; spapr_rtas_fn fn; @@ -527,6 +582,10 @@ static void core_rtas_register_types(void) rtas_set_power_level); spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", rtas_get_power_level); + spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register", + rtas_ibm_nmi_register); + spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock", + rtas_ibm_nmi_interlock); } type_init(core_rtas_register_types) -- cgit v1.1