#include "util/kvm-stat.h"
#include "util/parse-events.h"
#include "util/debug.h"
#include "book3s_hv_exits.h"
#include "book3s_hcalls.h"
#define NR_TPS 4
const char *vcpu_id_str = "vcpu_id";
const int decode_str_len = 40;
const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter";
const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit";
define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall);
/* Tracepoints specific to ppc_book3s_hv */
const char *ppc_book3s_hv_kvm_tp[] = {
"kvm_hv:kvm_guest_enter",
"kvm_hv:kvm_guest_exit",
"kvm_hv:kvm_hcall_enter",
"kvm_hv:kvm_hcall_exit",
NULL,
};
/* 1 extra placeholder for NULL */
const char *kvm_events_tp[NR_TPS + 1];
const char *kvm_exit_reason;
static void hcall_event_get_key(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->info = 0;
key->key = perf_evsel__intval(evsel, sample, "req");
}
static const char *get_hcall_exit_reason(u64 exit_code)
{
struct exit_reasons_table *tbl = hcall_reasons;
while (tbl->reason != NULL) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
}
pr_debug("Unknown hcall code: %lld\n",
(unsigned long long)exit_code);
return "UNKNOWN";
}
static bool hcall_event_end(struct perf_evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return (!strcmp(evsel->name, kvm_events_tp[3]));
}
static bool hcall_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
if (!strcmp(evsel->name, kvm_events_tp[2])) {
hcall_event_get_key(evsel, sample, key);
return true;
}
return false;
}
static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
struct event_key *key,
char *decode)
{
const char *hcall_reason = get_hcall_exit_reason(key->key);
scnprintf(decode, decode_str_len, "%s", hcall_reason);
}
static struct kvm_events_ops hcall_events = {
.is_begin_event = hcall_event_begin,
.is_end_event = hcall_event_end,
.decode_key = hcall_event_decode_key,
.name = "HCALL-EVENT",
};
static struct kvm_events_ops exit_events = {
.is_begin_event = exit_event_begin,
.is_end_event = exit_event_end,
.decode_key = exit_event_decode_key,
.name = "VM-EXIT"
};
struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events },
{ .name = "hcall", .ops = &hcall_events },
{ NULL, NULL },
};
const char * const kvm_skip_events[] = {
NULL,
};
static int is_tracepoint_available(const char *str, struct perf_evlist *evlist)
{
struct parse_events_error err;
int ret;
err.str = NULL;
ret = parse_events(evlist, str, &err);
if (err.str)
pr_err("%s : %s\n", str, err.str);
return ret;
}
static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm,
struct perf_evlist *evlist)
{
const char **events_ptr;
int i, nr_tp = 0, err = -1;
/* Check for book3s_hv tracepoints */
for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) {
err = is_tracepoint_available(*events_ptr, evlist);
if (err)
return -1;
nr_tp++;
}
for (i = 0; i < nr_tp; i++)
kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i];
kvm_events_tp[i] = NULL;
kvm_exit_reason = "trap";
kvm->exit_reasons = hv_exit_reasons;
kvm->exit_reasons_isa = "HV";
return 0;
}
/* Wrapper to setup kvm tracepoints */
static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm)
{
struct perf_evlist *evlist = perf_evlist__new();
if (evlist == NULL)
return -ENOMEM;
/* Right now, only supported on book3s_hv */
return ppc__setup_book3s_hv(kvm, evlist);
}
int setup_kvm_events_tp(struct perf_kvm_stat *kvm)
{
return ppc__setup_kvm_tp(kvm);
}
int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
{
int ret;
ret = ppc__setup_kvm_tp(kvm);
if (ret) {
kvm->exit_reasons = NULL;
kvm->exit_reasons_isa = NULL;
}
return ret;
}
ion value='35'>3540 space: include ignore mode: unified ssdiff stat only powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it
clears all the protection bits but leave the PTE valid.
With the Radix MMU, an attempt at executing from such a PTE will
take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G".
It is thus incorrect to treat all such faults as errors. We should
pass them to handle_mm_fault() for autonuma to deal with. The case
of pages that are really not executable is handled by the existing
test for VM_EXEC further down.
That leaves us with catching the kernel attempts at executing user
pages. We can catch that earlier, even before we do find_vma.
It is never valid on powerpc for the kernel to take an exec fault
to begin with. So fold that test with the existing test for the
kernel faulting on kernel addresses to bail out early.
Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report")
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>