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Add flag that toggles tracing

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This commit is contained in:
David Venhoff 2025-09-10 15:27:00 +02:00
parent 7883ec274c
commit c417e20ce0
3 changed files with 15 additions and 2 deletions
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5
nyx/interface.c
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@ -92,6 +92,8 @@ typedef struct nyx_interface_state {
bool dump_pt_trace; bool dump_pt_trace;
bool edge_cb_trace; bool edge_cb_trace;
bool global_pt_enable;
bool redqueen; bool redqueen;
uint32_t aux_buffer_size; uint32_t aux_buffer_size;
@ -394,6 +396,8 @@ static void nyx_realize(DeviceState *dev, Error **errp)
{ {
nyx_interface_state *s = NYX_MEM(dev); nyx_interface_state *s = NYX_MEM(dev);
set_global_pt_enabled(s->global_pt_enable);
if (s->bitmap_size <= 0) { if (s->bitmap_size <= 0) {
s->bitmap_size = DEFAULT_NYX_BITMAP_SIZE; s->bitmap_size = DEFAULT_NYX_BITMAP_SIZE;
} }
@ -465,6 +469,7 @@ static Property nyx_interface_properties[] = {
input_buffer_size, input_buffer_size,
DEFAULT_NYX_BITMAP_SIZE), DEFAULT_NYX_BITMAP_SIZE),
DEFINE_PROP_BOOL("dump_pt_trace", nyx_interface_state, dump_pt_trace, false), DEFINE_PROP_BOOL("dump_pt_trace", nyx_interface_state, dump_pt_trace, false),
DEFINE_PROP_BOOL("global_pt_enable", nyx_interface_state, global_pt_enable, true),
DEFINE_PROP_BOOL("edge_cb_trace", nyx_interface_state, edge_cb_trace, false), DEFINE_PROP_BOOL("edge_cb_trace", nyx_interface_state, edge_cb_trace, false),
DEFINE_PROP_UINT32("aux_buffer_size", DEFINE_PROP_UINT32("aux_buffer_size",
nyx_interface_state, nyx_interface_state,

10
nyx/pt.c
View File

@ -52,6 +52,12 @@ along with QEMU-PT. If not, see <http://www.gnu.org/licenses/>.
#define PT_BUFFER_MMAP_ADDR 0x3ffff0000000 #define PT_BUFFER_MMAP_ADDR 0x3ffff0000000
static bool PT_ENABLED = false;
void set_global_pt_enabled(bool pt_enabled) {
PT_ENABLED = pt_enabled;
}
static void pt_set(CPUState *cpu, run_on_cpu_data arg) static void pt_set(CPUState *cpu, run_on_cpu_data arg)
{ {
asm volatile("" ::: "memory"); asm volatile("" ::: "memory");
@ -257,7 +263,7 @@ void pt_pre_kvm_run(CPUState *cpu)
GET_GLOBAL_STATE()->redqueen_disable_pending = false; GET_GLOBAL_STATE()->redqueen_disable_pending = false;
} }
if (GET_GLOBAL_STATE()->pt_trace_mode || GET_GLOBAL_STATE()->pt_trace_mode_force) if (PT_ENABLED && (GET_GLOBAL_STATE()->pt_trace_mode || GET_GLOBAL_STATE()->pt_trace_mode_force))
{ {
if (!cpu->pt_fd) { if (!cpu->pt_fd) {
cpu->pt_fd = kvm_vcpu_ioctl(cpu, KVM_VMX_PT_SETUP_FD, (unsigned long)0); cpu->pt_fd = kvm_vcpu_ioctl(cpu, KVM_VMX_PT_SETUP_FD, (unsigned long)0);
@ -357,7 +363,7 @@ void pt_handle_overflow(CPUState *cpu)
void pt_post_kvm_run(CPUState *cpu) void pt_post_kvm_run(CPUState *cpu)
{ {
if (GET_GLOBAL_STATE()->pt_trace_mode || GET_GLOBAL_STATE()->pt_trace_mode_force) if (PT_ENABLED && (GET_GLOBAL_STATE()->pt_trace_mode || GET_GLOBAL_STATE()->pt_trace_mode_force))
{ {
pt_handle_overflow(cpu); pt_handle_overflow(cpu);
} }

2
nyx/pt.h
View File

@ -22,6 +22,8 @@ along with QEMU-PT. If not, see <http://www.gnu.org/licenses/>.
#ifndef PT_H #ifndef PT_H
#define PT_H #define PT_H
void set_global_pt_enabled(bool pt_enabled);
int pt_enable(CPUState *cpu, bool hmp_mode); int pt_enable(CPUState *cpu, bool hmp_mode);
int pt_disable(CPUState *cpu, bool hmp_mode); int pt_disable(CPUState *cpu, bool hmp_mode);
int pt_enable_ip_filtering(CPUState *cpu, uint8_t addrn, bool redqueen, bool hmp_mode); int pt_enable_ip_filtering(CPUState *cpu, uint8_t addrn, bool redqueen, bool hmp_mode);