cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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qmp.c (5047B)

      1/*
      2 * QMP commands for tracing events.
      3 *
      4 * Copyright (C) 2014-2016 Lluís Vilanova <vilanova@ac.upc.edu>
      5 *
      6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
      7 * See the COPYING file in the top-level directory.
      8 */
      9
     10#include "qemu/osdep.h"
     11#include "qapi/error.h"
     12#include "qapi/qapi-commands-trace.h"
     13#include "control-vcpu.h"
     14
     15
     16static CPUState *get_cpu(bool has_vcpu, int vcpu, Error **errp)
     17{
     18    if (has_vcpu) {
     19        CPUState *cpu = qemu_get_cpu(vcpu);
     20        if (cpu == NULL) {
     21            error_setg(errp, "invalid vCPU index %u", vcpu);
     22        }
     23        return cpu;
     24    } else {
     25        return NULL;
     26    }
     27}
     28
     29static bool check_events(bool has_vcpu, bool ignore_unavailable, bool is_pattern,
     30                         const char *name, Error **errp)
     31{
     32    if (!is_pattern) {
     33        TraceEvent *ev = trace_event_name(name);
     34
     35        /* error for non-existing event */
     36        if (ev == NULL) {
     37            error_setg(errp, "unknown event \"%s\"", name);
     38            return false;
     39        }
     40
     41        /* error for non-vcpu event */
     42        if (has_vcpu && !trace_event_is_vcpu(ev)) {
     43            error_setg(errp, "event \"%s\" is not vCPU-specific", name);
     44            return false;
     45        }
     46
     47        /* error for unavailable event */
     48        if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
     49            error_setg(errp, "event \"%s\" is disabled", name);
     50            return false;
     51        }
     52
     53        return true;
     54    } else {
     55        /* error for unavailable events */
     56        TraceEventIter iter;
     57        TraceEvent *ev;
     58        trace_event_iter_init_pattern(&iter, name);
     59        while ((ev = trace_event_iter_next(&iter)) != NULL) {
     60            if (!ignore_unavailable && !trace_event_get_state_static(ev)) {
     61                error_setg(errp, "event \"%s\" is disabled", trace_event_get_name(ev));
     62                return false;
     63            }
     64        }
     65        return true;
     66    }
     67}
     68
     69TraceEventInfoList *qmp_trace_event_get_state(const char *name,
     70                                              bool has_vcpu, int64_t vcpu,
     71                                              Error **errp)
     72{
     73    Error *err = NULL;
     74    TraceEventInfoList *events = NULL;
     75    TraceEventIter iter;
     76    TraceEvent *ev;
     77    bool is_pattern = trace_event_is_pattern(name);
     78    CPUState *cpu;
     79
     80    /* Check provided vcpu */
     81    cpu = get_cpu(has_vcpu, vcpu, &err);
     82    if (err) {
     83        error_propagate(errp, err);
     84        return NULL;
     85    }
     86
     87    /* Check events */
     88    if (!check_events(has_vcpu, true, is_pattern, name, errp)) {
     89        return NULL;
     90    }
     91
     92    /* Get states (all errors checked above) */
     93    trace_event_iter_init_pattern(&iter, name);
     94    while ((ev = trace_event_iter_next(&iter)) != NULL) {
     95        TraceEventInfo *value;
     96        bool is_vcpu = trace_event_is_vcpu(ev);
     97        if (has_vcpu && !is_vcpu) {
     98            continue;
     99        }
    100
    101        value = g_new(TraceEventInfo, 1);
    102        value->vcpu = is_vcpu;
    103        value->name = g_strdup(trace_event_get_name(ev));
    104
    105        if (!trace_event_get_state_static(ev)) {
    106            value->state = TRACE_EVENT_STATE_UNAVAILABLE;
    107        } else {
    108            if (has_vcpu) {
    109                if (is_vcpu) {
    110                    if (trace_event_get_vcpu_state_dynamic(cpu, ev)) {
    111                        value->state = TRACE_EVENT_STATE_ENABLED;
    112                    } else {
    113                        value->state = TRACE_EVENT_STATE_DISABLED;
    114                    }
    115                }
    116                /* else: already skipped above */
    117            } else {
    118                if (trace_event_get_state_dynamic(ev)) {
    119                    value->state = TRACE_EVENT_STATE_ENABLED;
    120                } else {
    121                    value->state = TRACE_EVENT_STATE_DISABLED;
    122                }
    123            }
    124        }
    125        QAPI_LIST_PREPEND(events, value);
    126    }
    127
    128    return events;
    129}
    130
    131void qmp_trace_event_set_state(const char *name, bool enable,
    132                               bool has_ignore_unavailable, bool ignore_unavailable,
    133                               bool has_vcpu, int64_t vcpu,
    134                               Error **errp)
    135{
    136    Error *err = NULL;
    137    TraceEventIter iter;
    138    TraceEvent *ev;
    139    bool is_pattern = trace_event_is_pattern(name);
    140    CPUState *cpu;
    141
    142    /* Check provided vcpu */
    143    cpu = get_cpu(has_vcpu, vcpu, &err);
    144    if (err) {
    145        error_propagate(errp, err);
    146        return;
    147    }
    148
    149    /* Check events */
    150    if (!check_events(has_vcpu, has_ignore_unavailable && ignore_unavailable,
    151                      is_pattern, name, errp)) {
    152        return;
    153    }
    154
    155    /* Apply changes (all errors checked above) */
    156    trace_event_iter_init_pattern(&iter, name);
    157    while ((ev = trace_event_iter_next(&iter)) != NULL) {
    158        if (!trace_event_get_state_static(ev) ||
    159            (has_vcpu && !trace_event_is_vcpu(ev))) {
    160            continue;
    161        }
    162        if (has_vcpu) {
    163            trace_event_set_vcpu_state_dynamic(cpu, ev, enable);
    164        } else {
    165            trace_event_set_state_dynamic(ev, enable);
    166        }
    167    }
    168}