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ppc/spapr: KVM FWNMI should not be enabled until guest requests it 

The KVM FWNMI capability should be enabled with the "ibm,nmi-register"
rtas call. Although MCEs from KVM will be delivered as architected
interrupts to the guest before "ibm,nmi-register" is called, KVM has
different behaviour depending on whether the guest has enabled FWNMI
(it attempts to do more recovery on behalf of a non-FWNMI guest).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20200325142906.221248-2-npiggin@gmail.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nicholas Piggin 2020-03-26 00:29:03 +10:00 committed by David Gibson
parent 79178edd2a
commit ec010c0066
4 changed files with 24 additions and 3 deletions
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7
hw/ppc/spapr_caps.c
View File

@ -517,9 +517,10 @@ static void cap_fwnmi_apply(SpaprMachineState *spapr, uint8_t val,
}
if (kvm_enabled()) {
if (kvmppc_set_fwnmi() < 0) {
error_setg(errp, "Firmware Assisted Non-Maskable Interrupts(FWNMI) "
"not supported by KVM");
if (!kvmppc_get_fwnmi()) {
error_setg(errp,
"Firmware Assisted Non-Maskable Interrupts(FWNMI) not supported by KVM.");
error_append_hint(errp, "Try appending -machine cap-fwnmi=off\n");
}
}
}

7
hw/ppc/spapr_rtas.c
View File

@ -437,6 +437,13 @@ static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
return;
}
if (kvm_enabled()) {
if (kvmppc_set_fwnmi() < 0) {
rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
return;
}
}
spapr->fwnmi_system_reset_addr = sreset_addr;
spapr->fwnmi_machine_check_addr = mce_addr;

7
target/ppc/kvm.c
View File

@ -88,6 +88,7 @@ static int cap_ppc_safe_indirect_branch;
static int cap_ppc_count_cache_flush_assist;
static int cap_ppc_nested_kvm_hv;
static int cap_large_decr;
static int cap_fwnmi;
static uint32_t debug_inst_opcode;
@ -136,6 +137,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
kvmppc_get_cpu_characteristics(s);
cap_ppc_nested_kvm_hv = kvm_vm_check_extension(s, KVM_CAP_PPC_NESTED_HV);
cap_large_decr = kvmppc_get_dec_bits();
cap_fwnmi = kvm_vm_check_extension(s, KVM_CAP_PPC_FWNMI);
/*
* Note: setting it to false because there is not such capability
* in KVM at this moment.
@ -2064,6 +2066,11 @@ void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
}
}
bool kvmppc_get_fwnmi(void)
{
return cap_fwnmi;
}
int kvmppc_set_fwnmi(void)
{
PowerPCCPU *cpu = POWERPC_CPU(first_cpu);

6
target/ppc/kvm_ppc.h
View File

@ -27,6 +27,7 @@ void kvmppc_enable_h_page_init(void);
void kvmppc_set_papr(PowerPCCPU *cpu);
int kvmppc_set_compat(PowerPCCPU *cpu, uint32_t compat_pvr);
void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy);
bool kvmppc_get_fwnmi(void);
int kvmppc_set_fwnmi(void);
int kvmppc_smt_threads(void);
void kvmppc_error_append_smt_possible_hint(Error *const *errp);
@ -163,6 +164,11 @@ static inline void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
{
}
static inline bool kvmppc_get_fwnmi(void)
{
return false;
}
static inline int kvmppc_set_fwnmi(void)
{
return -1;