On Wed, May 29, 2019 at 11:10:14AM +0530, Aravinda Prasad wrote: > 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. 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> > Reviewed-by: David Gibson <da...@gibson.dropbear.id.au> > --- > hw/ppc/spapr.c | 7 +++++ > hw/ppc/spapr_rtas.c | 65 > ++++++++++++++++++++++++++++++++++++++++++++++++ > include/hw/ppc/spapr.h | 9 ++++++- > 3 files changed, 80 insertions(+), 1 deletion(-) > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index e2b33e5..fae28a9 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -1808,6 +1808,11 @@ static void spapr_machine_reset(void) > first_ppc_cpu->env.gpr[5] = 0; > > spapr->cas_reboot = false; > + > + spapr->guest_machine_check_addr = -1; > + > + /* Signal all vCPUs waiting on this condition */ > + qemu_cond_broadcast(&spapr->mc_delivery_cond); > } > > static void spapr_create_nvram(SpaprMachineState *spapr) > @@ -3072,6 +3077,8 @@ static void spapr_machine_init(MachineState *machine) > > kvmppc_spapr_enable_inkernel_multitce(); > } > + > + qemu_cond_init(&spapr->mc_delivery_cond); > } > > static int spapr_kvm_type(MachineState *machine, const char *vm_type) > diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c > index 5bc1a93..e7509cf 100644 > --- a/hw/ppc/spapr_rtas.c > +++ b/hw/ppc/spapr_rtas.c > @@ -352,6 +352,38 @@ 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 = 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->guest_machine_check_addr == -1) { > + /* NMI register not called */ > + rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); > + } else { > + 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; > @@ -470,6 +502,35 @@ void spapr_load_rtas(SpaprMachineState *spapr, void > *fdt, hwaddr addr) > } > } > > +hwaddr spapr_get_rtas_addr(void) > +{ > + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); > + int rtas_node; > + const struct fdt_property *rtas_addr_prop; > + void *fdt = spapr->fdt_blob; > + uint32_t rtas_addr; > + > + /* fetch rtas addr from fdt */ > + rtas_node = fdt_path_offset(fdt, "/rtas"); > + if (rtas_node == 0) { > + return 0;
This is incorrect, a return code < 0 indicates an error which you should check for. A return code of 0 indicates the root node, which could only happen if libfdt was badly buggy. > + } > + > + rtas_addr_prop = fdt_get_property(fdt, rtas_node, "linux,rtas-base", > NULL); fdt_get_property is generally only needed for certain edge cases. fdt_getprop() is a better option. > + if (!rtas_addr_prop) { > + return 0; > + } > + > + /* > + * We assume that the OS called RTAS instantiate-rtas, but some other > + * OS might call RTAS instantiate-rtas-64 instead. This fine as of now > + * as SLOF only supports 32-bit variant. > + */ > + rtas_addr = fdt32_to_cpu(*(uint32_t *)rtas_addr_prop->data); > + return (hwaddr)rtas_addr; > +} > + > + > static void core_rtas_register_types(void) > { > spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", > @@ -493,6 +554,10 @@ 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 4f5becf..9dc5e30 100644 > --- a/include/hw/ppc/spapr.h > +++ b/include/hw/ppc/spapr.h > @@ -188,6 +188,10 @@ 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; > + QemuCond mc_delivery_cond; > + > /*< public >*/ > char *kvm_type; > char *host_model; > @@ -624,8 +628,10 @@ 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 > @@ -876,4 +882,5 @@ void spapr_check_pagesize(SpaprMachineState *spapr, > hwaddr pagesize, > #define SPAPR_OV5_XIVE_BOTH 0x80 /* Only to advertise on the platform */ > > void spapr_set_all_lpcrs(target_ulong value, target_ulong mask); > +uint64_t spapr_get_rtas_addr(void); > #endif /* HW_SPAPR_H */ > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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