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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: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-10-18 13:51:11 +02:00 committed by Michael S. Tsirkin
parent 83d08f2673
commit d4fce24f3a
3 changed files with 20 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
include/sysemu/qtest.h
View File

@ -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)
{
#ifdef CONFIG_POSIX
return 1;
}
int qtest_init(void);
#else
static inline bool qtest_enabled(void)
{
return false;
}
static inline int qtest_available(void)
{
return 0;
}
static inline int qtest_init(void)
{
return 0;
#endif
}
#endif
#endif

20
qtest.c
View File

@ -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_prefix(chr);
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_prefix(chr);
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;
g_assert(words[1]);
@ -502,13 +500,17 @@ static void qtest_event(void *opaque, int event)
}
}
int qtest_init(void)
int qtest_init_accel(void)
{
configure_icount("0");
return 0;
}
void qtest_init(const char *qtest_chrdev, const char *qtest_log)
{
CharDriverState *chr;
g_assert(qtest_chrdev != NULL);
configure_icount("0");
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;
}

8
vl.c
View File

@ -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;
#ifdef CONFIG_VNC
@ -4043,8 +4045,8 @@ int main(int argc, char **argv, char **envp)
configure_accelerator();
if (!qtest_enabled() && qtest_chrdev) {
qtest_init();
if (qtest_chrdev) {
qtest_init(qtest_chrdev, qtest_log);
}
machine_opts = qemu_get_machine_opts();