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target/ppc: Handle NMI guest exit

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Memory error such as bit flips that cannot be corrected
by hardware are passed on to the kernel for handling.
If the memory address in error belongs to guest then
the guest kernel is responsible for taking suitable action.
Patch [1] enhances KVM to exit guest with exit reason
set to KVM_EXIT_NMI in such cases. This patch handles
KVM_EXIT_NMI exit.

[1] https://www.spinics.net/lists/kvm-ppc/msg12637.html
    (e20bbd3d and related commits)

Signed-off-by: Aravinda Prasad <arawinda.p@gmail.com>
Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <20200130184423.20519-4-ganeshgr@linux.ibm.com>
[dwg: #ifdefs to fix compile for 32-bit target]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Aravinda Prasad 2020-01-31 00:14:19 +05:30 • committed by David Gibson
parent 9d953ce447
commit 9ac703ac5f
6 changed files with 76 additions and 0 deletions
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18
target/ppc/kvm.c
View file

@ -1705,6 +1705,13 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
ret = 0;
break;
#if defined(TARGET_PPC64)
case KVM_EXIT_NMI:
trace_kvm_handle_nmi_exception();
ret = kvm_handle_nmi(cpu, run);
break;
#endif
default:
fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
ret = -1;
@ -2800,6 +2807,17 @@ int kvm_arch_msi_data_to_gsi(uint32_t data)
return data & 0xffff;
}
#if defined(TARGET_PPC64)
int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run)
{
cpu_synchronize_state(CPU(cpu));
spapr_mce_req_event(cpu);
return 0;
}
#endif
int kvmppc_enable_hwrng(void)
{
if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_PPC_HWRNG)) {

2
target/ppc/kvm_ppc.h
View file

@ -84,6 +84,8 @@ void kvm_check_mmu(PowerPCCPU *cpu, Error **errp);
void kvmppc_set_reg_ppc_online(PowerPCCPU *cpu, unsigned int online);
void kvmppc_set_reg_tb_offset(PowerPCCPU *cpu, int64_t tb_offset);
int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run);
#else
static inline uint32_t kvmppc_get_tbfreq(void)

1
target/ppc/trace-events
View file

@ -28,3 +28,4 @@ kvm_handle_papr_hcall(void) "handle PAPR hypercall"
kvm_handle_epr(void) "handle epr"
kvm_handle_watchdog_expiry(void) "handle watchdog expiry"
kvm_handle_debug_exception(void) "handle debug exception"
kvm_handle_nmi_exception(void) "handle NMI exception"