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 waits till the first processor, which also received a machine check error, is done reading the error log. The first processor issues "ibm,nmi-interlock" call when the error log is consumed. This patch implements the releasing part of the error-log while subsequent patch (which builds error log) handles the locking part. Signed-off-by: Aravinda Prasad <aravi...@linux.vnet.ibm.com> --- hw/ppc/spapr.c | 8 ++++++++ hw/ppc/spapr_rtas.c | 35 +++++++++++++++++++++++++++++++++++ include/hw/ppc/spapr.h | 11 ++++++++++- 3 files changed, 53 insertions(+), 1 deletion(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 5deae30..d568ea6 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1477,6 +1477,11 @@ static void ppc_spapr_reset(void) first_ppc_cpu->env.nip = SPAPR_ENTRY_POINT; spapr->cas_reboot = false; + + spapr->mc_status = -1; + spapr->guest_machine_check_addr = 0; + qemu_cond_destroy(&spapr->mc_delivery_cond); + qemu_cond_init(&spapr->mc_delivery_cond); } static void spapr_create_nvram(sPAPRMachineState *spapr) @@ -2598,6 +2603,9 @@ static void ppc_spapr_init(MachineState *machine) kvmppc_spapr_enable_inkernel_multitce(); } + + spapr->mc_status = -1; + qemu_cond_init(&spapr->mc_delivery_cond); } static int spapr_kvm_type(const char *vm_type) diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index cdf0b60..08e9a5e 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -348,6 +348,37 @@ 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) +{ + 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->guest_machine_check_addr) { + /* NMI register not called */ + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); + } else { + /* + * 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; @@ -489,6 +520,10 @@ 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) diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index b395aa7..28b6e2e 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -124,6 +124,13 @@ struct sPAPRMachineState { * occurs during the unplug process. */ QTAILQ_HEAD(, sPAPRDIMMState) pending_dimm_unplugs; + /* State related to "ibm,nmi-register" and "ibm,nmi-interlock" calls */ + target_ulong guest_machine_check_addr; + /* mc_status is set to -1 if mc is not in progress, else is set to the CPU + * handling the mc. */ + int mc_status; + QemuCond mc_delivery_cond; + /*< public >*/ char *kvm_type; MemoryHotplugState hotplug_memory; @@ -520,8 +527,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode, #define RTAS_IBM_CREATE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x27) #define RTAS_IBM_REMOVE_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x28) #define RTAS_IBM_RESET_PE_DMA_WINDOW (RTAS_TOKEN_BASE + 0x29) +#define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2A) +#define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2B) -#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2A) +#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2C) /* RTAS ibm,get-system-parameter token values */ #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20