This allows (non-primary) console devices to be created on the command
line.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
hw/char/trace-events | 8 +
hw/char/xen_console.c | 502 +++++++++++++++++++++++++++---------
hw/xen/xen-legacy-backend.c | 1 -
3 files changed, 381 insertions(+), 130 deletions(-)
diff --git a/hw/char/trace-events b/hw/char/trace-events
index babf4d35ea..7a398c82a5 100644
--- a/hw/char/trace-events
+++ b/hw/char/trace-events
@@ -105,3 +105,11 @@ cadence_uart_baudrate(unsigned baudrate) "baudrate %u"
# sh_serial.c
sh_serial_read(char *id, unsigned size, uint64_t offs, uint64_t val) " %s size %d offs
0x%02" PRIx64 " -> 0x%02" PRIx64
sh_serial_write(char *id, unsigned size, uint64_t offs, uint64_t val) "%s size %d offs
0x%02" PRIx64 " <- 0x%02" PRIx64
+
+# xen_console.c
+xen_console_connect(unsigned int idx, unsigned int ring_ref, unsigned int port, unsigned
int limit) "idx %u ring_ref %u port %u limit %u"
+xen_console_disconnect(unsigned int idx) "idx %u"
+xen_console_unrealize(unsigned int idx) "idx %u"
+xen_console_realize(unsigned int idx, const char *chrdev) "idx %u chrdev %s"
+xen_console_device_create(unsigned int idx) "idx %u"
+xen_console_device_destroy(unsigned int idx) "idx %u"
diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c
index 810dae3f44..bd20be116c 100644
--- a/hw/char/xen_console.c
+++ b/hw/char/xen_console.c
@@ -20,15 +20,19 @@
*/
#include "qemu/osdep.h"
+#include "qemu/cutils.h"
#include <sys/select.h>
#include <termios.h>
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "chardev/char-fe.h"
-#include "hw/xen/xen-legacy-backend.h"
-
+#include "hw/xen/xen-backend.h"
+#include "hw/xen/xen-bus-helper.h"
+#include "hw/qdev-properties.h"
+#include "hw/qdev-properties-system.h"
#include "hw/xen/interface/io/console.h"
+#include "trace.h"
struct buffer {
uint8_t *data;
@@ -39,16 +43,22 @@ struct buffer {
};
struct XenConsole {
- struct XenLegacyDevice xendev; /* must be first */
+ struct XenDevice xendev; /* must be first */
+ XenEventChannel *event_channel;
+ int dev;
struct buffer buffer;
- char console[XEN_BUFSIZE];
- int ring_ref;
+ char *fe_path;
+ unsigned int ring_ref;
void *sring;
CharBackend chr;
int backlog;
};
+typedef struct XenConsole XenConsole;
+
+#define TYPE_XEN_CONSOLE_DEVICE "xen-console"
+OBJECT_DECLARE_SIMPLE_TYPE(XenConsole, XEN_CONSOLE_DEVICE)
-static void buffer_append(struct XenConsole *con)
+static bool buffer_append(XenConsole *con)
{
struct buffer *buffer = &con->buffer;
XENCONS_RING_IDX cons, prod, size;
@@ -60,7 +70,7 @@ static void buffer_append(struct XenConsole *con)
size = prod - cons;
if ((size == 0) || (size > sizeof(intf->out)))
- return;
+ return false;
if ((buffer->capacity - buffer->size) < size) {
buffer->capacity += (size + 1024);
@@ -73,7 +83,7 @@ static void buffer_append(struct XenConsole *con)
xen_mb();
intf->out_cons = cons;
- xen_pv_send_notify(&con->xendev);
+ xen_device_notify_event_channel(XEN_DEVICE(con), con->event_channel, NULL);
if (buffer->max_capacity &&
buffer->size > buffer->max_capacity) {
@@ -89,6 +99,7 @@ static void buffer_append(struct XenConsole *con)
if (buffer->consumed > buffer->max_capacity - over)
buffer->consumed = buffer->max_capacity - over;
}
+ return true;
}
static void buffer_advance(struct buffer *buffer, size_t len)
@@ -100,7 +111,7 @@ static void buffer_advance(struct buffer *buffer, size_t
len)
}
}
-static int ring_free_bytes(struct XenConsole *con)
+static int ring_free_bytes(XenConsole *con)
{
struct xencons_interface *intf = con->sring;
XENCONS_RING_IDX cons, prod, space;
@@ -118,13 +129,13 @@ static int ring_free_bytes(struct XenConsole *con)
static int xencons_can_receive(void *opaque)
{
- struct XenConsole *con = opaque;
+ XenConsole *con = opaque;
return ring_free_bytes(con);
}
static void xencons_receive(void *opaque, const uint8_t *buf, int len)
{
- struct XenConsole *con = opaque;
+ XenConsole *con = opaque;
struct xencons_interface *intf = con->sring;
XENCONS_RING_IDX prod;
int i, max;
@@ -141,10 +152,10 @@ static void xencons_receive(void *opaque, const uint8_t
*buf, int len)
}
xen_wmb();
intf->in_prod = prod;
- xen_pv_send_notify(&con->xendev);
+ xen_device_notify_event_channel(XEN_DEVICE(con), con->event_channel, NULL);
}
-static void xencons_send(struct XenConsole *con)
+static bool xencons_send(XenConsole *con)
{
ssize_t len, size;
@@ -159,174 +170,407 @@ static void xencons_send(struct XenConsole *con)
if (len < 1) {
if (!con->backlog) {
con->backlog = 1;
- xen_pv_printf(&con->xendev, 1,
- "backlog piling up, nobody listening?\n");
}
} else {
buffer_advance(&con->buffer, len);
if (con->backlog && len == size) {
con->backlog = 0;
- xen_pv_printf(&con->xendev, 1, "backlog is gone\n");
}
}
+ return len > 0;
}
/* -------------------------------------------------------------------- */
-static int store_con_info(struct XenConsole *con)
+static bool con_event(void *_xendev)
{
- Chardev *cs = qemu_chr_fe_get_driver(&con->chr);
- char *pts = NULL;
- char *dom_path;
- g_autoptr(GString) path = NULL;
+ XenConsole *con = XEN_CONSOLE_DEVICE(_xendev);
+ bool done_something;
- /* Only continue if we're talking to a pty. */
- if (!CHARDEV_IS_PTY(cs)) {
- return 0;
- }
- pts = cs->filename + 4;
+ done_something = buffer_append(con);
- dom_path = qemu_xen_xs_get_domain_path(xenstore, xen_domid);
- if (!dom_path) {
- return 0;
+ if (con->buffer.size - con->buffer.consumed) {
+ done_something |= xencons_send(con);
}
+ return done_something;
+}
- path = g_string_new(dom_path);
- free(dom_path);
+/* -------------------------------------------------------------------- */
- if (con->xendev.dev) {
- g_string_append_printf(path, "/device/console/%d", con->xendev.dev);
- } else {
- g_string_append(path, "/console");
+static void xen_console_disconnect(XenDevice *xendev, Error **errp)
+{
+ XenConsole *con = XEN_CONSOLE_DEVICE(xendev);
+
+ qemu_chr_fe_set_handlers(&con->chr, NULL, NULL, NULL, NULL,
+ con, NULL, true);
+