Commit d4fce24f authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Michael S. Tsirkin

qtest: split configuration of qtest accelerator and chardev

qtest uses the icount infrastructure to implement a test-driven vm_clock.  This
however is not necessary when using -qtest as a "probe" together with a normal
TCG-, KVM- or Xen-based virtual machine.  Hence, split out the call to
configure_icount into a new function that is called only for "-machine
accel=qtest"; and disable those commands when running with an accelerator
other than qtest.

This also fixes an assertion failure with "qemu-system-x86_64 -machine
accel=qtest" but no -qtest option.  This is a valid case, albeit somewhat
weird; nothing will happen in the VM but you'll still be able to
interact with the monitor or the GUI.

Now that qtest_init is not limited to an int(void) function, change
global variables that are not used outside qtest_init to arguments.

And finally, cleanup useless parts of include/sysemu/qtest.h.  The file
is not used at all for user-only emulation, and qtest is not available
on Win32 due to its usage of sigwait.
Reported-by: default avatarMichael S. Tsirkin <>
Reviewed-by: default avatarMichael S. Tsirkin <>
Tested-by: default avatarMichael S. Tsirkin <>
Signed-off-by: default avatarPaolo Bonzini <>
Signed-off-by: default avatarMichael S. Tsirkin <>
parent 83d08f26
......@@ -16,38 +16,23 @@
#include "qemu-common.h"
#if !defined(CONFIG_USER_ONLY)
extern bool qtest_allowed;
extern const char *qtest_chrdev;
extern const char *qtest_log;
static inline bool qtest_enabled(void)
return qtest_allowed;
int qtest_init_accel(void);
void qtest_init(const char *qtest_chrdev, const char *qtest_log);
static inline int qtest_available(void)
return 1;
int qtest_init(void);
static inline bool qtest_enabled(void)
return false;
static inline int qtest_available(void)
return 0;
static inline int qtest_init(void)
return 0;
......@@ -22,8 +22,6 @@
#define MAX_IRQ 256
const char *qtest_chrdev;
const char *qtest_log;
bool qtest_allowed;
static DeviceState *irq_intercept_dev;
......@@ -406,7 +404,7 @@ static void qtest_process_command(CharDriverState *chr, gchar **words)
qtest_send(chr, "OK\n");
} else if (strcmp(words[0], "clock_step") == 0) {
} else if (qtest_enabled() && strcmp(words[0], "clock_step") == 0) {
int64_t ns;
if (words[1]) {
......@@ -417,7 +415,7 @@ static void qtest_process_command(CharDriverState *chr, gchar **words)
qtest_clock_warp(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + ns);
qtest_send(chr, "OK %"PRIi64"\n", (int64_t)qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
} else if (strcmp(words[0], "clock_set") == 0) {
} else if (qtest_enabled() && strcmp(words[0], "clock_set") == 0) {
int64_t ns;
......@@ -502,13 +500,17 @@ static void qtest_event(void *opaque, int event)
int qtest_init(void)
int qtest_init_accel(void)
CharDriverState *chr;
g_assert(qtest_chrdev != NULL);
return 0;
void qtest_init(const char *qtest_chrdev, const char *qtest_log)
CharDriverState *chr;
chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
qemu_chr_add_handlers(chr, qtest_can_read, qtest_read, qtest_event, chr);
......@@ -525,6 +527,4 @@ int qtest_init(void)
qtest_chr = chr;
return 0;
......@@ -2624,7 +2624,7 @@ static struct {
{ "tcg", "tcg", tcg_available, tcg_init, &tcg_allowed },
{ "xen", "Xen", xen_available, xen_init, &xen_allowed },
{ "kvm", "KVM", kvm_available, kvm_init, &kvm_allowed },
{ "qtest", "QTest", qtest_available, qtest_init, &qtest_allowed },
{ "qtest", "QTest", qtest_available, qtest_init_accel, &qtest_allowed },
static int configure_accelerator(void)
......@@ -2836,6 +2836,8 @@ int main(int argc, char **argv, char **envp)
QEMUMachine *machine;
const char *cpu_model;
const char *vga_model = "none";
const char *qtest_chrdev = NULL;
const char *qtest_log = NULL;
const char *pid_file = NULL;
const char *incoming = NULL;
......@@ -4043,8 +4045,8 @@ int main(int argc, char **argv, char **envp)
if (!qtest_enabled() && qtest_chrdev) {
if (qtest_chrdev) {
qtest_init(qtest_chrdev, qtest_log);
machine_opts = qemu_get_machine_opts();
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