builtin-debug.c

#include <kvm/util.h>
#include <kvm/builtin-debug.h>
#include <kvm/kvm.h>
#include <kvm/parse-options.h>
#include <kvm/kvm-ipc.h>
#include <kvm/read-write.h>

#include <stdio.h>
#include <string.h>
#include <signal.h>

#define BUFFER_SIZE 100

static bool all;
static int nmi = -1;
static bool dump;
static const char *instance_name;
static const char *sysrq;

static int do_debug(const char *name, int sock)
{
	char buff[BUFFER_SIZE];
	struct debug_cmd_params cmd = {.dbg_type = 0};
	int r;

	if (dump)
		cmd.dbg_type |= KVM_DEBUG_CMD_TYPE_DUMP;

	if (nmi != -1) {
		cmd.dbg_type |= KVM_DEBUG_CMD_TYPE_NMI;
		cmd.cpu = nmi;
	}

	if (sysrq) {
		cmd.dbg_type |= KVM_DEBUG_CMD_TYPE_SYSRQ;
		cmd.sysrq = sysrq[0];
	}

	r = kvm_ipc__send_msg(sock, KVM_IPC_DEBUG, sizeof(cmd), (u8 *)&cmd);
	if (r < 0)
		return r;

	if (!dump)
		return 0;

	do {
		r = xread(sock, buff, BUFFER_SIZE);
		if (r < 0)
			return 0;
		printf("%.*s", r, buff);
	} while (r > 0);

	return 0;
}

int kvm_cmd_debug(int argc, const char **argv, const char *prefix)
{
	int instance;
	int r;

	if (all)
		return kvm__enumerate_instances(do_debug);

	if (instance_name == NULL)
		return 1; // TODO: panic

	instance = kvm__get_sock_by_instance(instance_name);

	if (instance <= 0)
		die("Failed locating instance");

	r = do_debug(instance_name, instance);

	close(instance);

	return r;
}