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ppc: spapr: Handle "ibm,nmi-register" and "ibm,nmi-interlock" RTAS calls

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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 <arawinda.p@gmail.com>
[Register fwnmi RTAS calls in core_rtas_register_types()
 where other RTAS calls are registered]
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Message-Id: <20200130184423.20519-6-ganeshgr@linux.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Aravinda Prasad 2020-01-31 00:14:21 +05:30 committed by David Gibson
parent 81fe70e443
commit f03496bc12
3 changed files with 72 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
hw/ppc/spapr_caps.c
View File

@ -515,6 +515,16 @@ static void cap_fwnmi_mce_apply(SpaprMachineState *spapr, uint8_t val,
if (!val) {
return; /* Disabled by default */
}
if (tcg_enabled()) {
warn_report("Firmware Assisted Non-Maskable Interrupts(FWNMI) not "
"supported in TCG");
} else if (kvm_enabled()) {
if (kvmppc_set_fwnmi() < 0) {
error_setg(errp, "Firmware Assisted Non-Maskable Interrupts(FWNMI) "
"not supported by KVM");
}
}
}
SpaprCapabilityInfo capability_table[SPAPR_CAP_NUM] = {

59
hw/ppc/spapr_rtas.c
View File

@ -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)

4
include/hw/ppc/spapr.h
View File

@ -656,8 +656,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode,
#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_SUSPEND_ME (RTAS_TOKEN_BASE + 0x2A)
#define RTAS_IBM_NMI_REGISTER (RTAS_TOKEN_BASE + 0x2B)
#define RTAS_IBM_NMI_INTERLOCK (RTAS_TOKEN_BASE + 0x2C)
#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2B)
#define RTAS_TOKEN_MAX (RTAS_TOKEN_BASE + 0x2D)
/* RTAS ibm,get-system-parameter token values */
#define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS 20