[PATCH 3/3] virtio-console: Add interface for generic guest-host communication

Amit Shah
2009-08-25T08:17:36Z

This interface extends the virtio-console device to handle
multiple ports that present a char device from which bits can
be sent and read.

Sample uses for such a device can be obtaining info from the
guest like the file systems used, apps installed, etc. for
offline usage and logged-in users, clipboard copy-paste, etc.
for online usage.

Each port is to be assigned a unique function, for example, the
first 4 ports may be reserved for libvirt usage, the next 4 for
generic streaming data and so on. This port-function mapping
isn't finalised yet.

For requirements, use-cases and some history see

http://www.linux-kvm.org/page/VMchannel_Requirements

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
hw/pc.c | 16 ++-
hw/virtio-console.c | 423 +++++++++++++++++++++++++++++++++++++++++++++------
hw/virtio-console.h | 47 ++++++
monitor.c | 7 +
qemu-monitor.hx | 10 ++
qemu-options.hx | 2 +-
sysemu.h | 10 +-
vl.c | 41 +++---
8 files changed, 479 insertions(+), 77 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index ca681b8..96eb7ac 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1453,11 +1453,17 @@ static void pc_init1(ram_addr_t ram_size,
}

/* Add virtio console devices */
- if (pci_enabled) {
- for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
- if (virtcon_hds[i]) {
- pci_create_simple(pci_bus, -1, "virtio-console-pci");
- }
+ if (pci_enabled && virtcon_nr_ports) {
+ void *dev;
+
+ dev = pci_create_simple(pci_bus, -1, "virtio-console-pci");
+ if (!dev) {
+ fprintf(stderr, "qemu: could not create virtio console pci device\n");
+ exit(1);
+ }
+
+ for (i = 0; i < virtcon_nr_ports; i++) {
+ virtio_console_new_port(dev, virtcon_idx[i]);
}
}

diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index 92c953c..f8f9866 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -2,9 +2,11 @@
* Virtio Console Device
*
* Copyright IBM, Corp. 2008
+ * Copyright Red Hat, Inc. 2009
*
* Authors:
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
+ * Amit Shah <amit.shah@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
@@ -12,39 +14,158 @@
*/

#include "hw.h"
+#include "pci.h"
+#include "monitor.h"
#include "qemu-char.h"
#include "virtio.h"
#include "virtio-console.h"

-
typedef struct VirtIOConsole
{
VirtIODevice vdev;
+ PCIDevice *dev;
VirtQueue *ivq, *ovq;
- CharDriverState *chr;
+ struct VirtIOConsolePort *ports;
+ struct virtio_console_config *config;
+ uint32_t guest_features;
} VirtIOConsole;

-static VirtIOConsole *to_virtio_console(VirtIODevice *vdev)
+typedef struct VirtIOConsolePort {
+ VirtIOConsole *vcon;
+ CharDriverState *hd;
+ bool guest_connected;
+} VirtIOConsolePort;
+
+static VirtIOConsole *virtio_console;
+static struct virtio_console_config virtcon_config;
+
+static VirtIOConsolePort *get_port_from_id(uint32_t id)
+{
+ if (id > MAX_VIRTIO_CONSOLE_PORTS)
+ return NULL;
+
+ return &virtio_console->ports[id];
+}
+
+static int get_id_from_port(VirtIOConsolePort *port)
{
- return (VirtIOConsole *)vdev;
+ uint32_t i;
+
+ for (i = 0; i < MAX_VIRTIO_CONSOLE_PORTS; i++) {
+ if (port == &virtio_console->ports[i]) {
+ return i;
+ }
+ }
+ return VIRTIO_CONSOLE_BAD_ID;
+}
+
+static bool use_multiport(void)
+{
+ return virtio_console->guest_features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
+}
+
+void virtio_console_monitor_command(Monitor *mon,
+ const char *command, const char *param)
+{
+ int ret;
+
+ if(!strncmp(command, "add_port", 8)) {
+ if (!param) {
+ monitor_printf(mon, "Error: need port id to add new port\n");
+ return;
+ }
+ ret = init_virtio_console_port(virtcon_nr_ports, param);
+ if (ret < 0) {
+ monitor_printf(mon, "Error: cannot add new port: %s\n",
+ strerror(-ret));
+ return;
+ }
+ virtio_console_new_port(NULL, virtcon_idx[virtcon_nr_ports]);
+ virtcon_nr_ports++;
+ virtio_console->config->nr_active_ports = cpu_to_le32(virtcon_nr_ports);
+ return;
+ }
+}
+
+static size_t flush_buf(uint32_t id, VirtIOConsolePort *port,
+ const uint8_t *buf, size_t len)
+{
+ size_t write_len = 0;
+
+ if (port->hd) {
+ write_len = qemu_chr_write(port->hd, buf, len);
+ return write_len;
+ }
+ return 0;
+}
+
+/* Guest wants to notify us of some event */
+static void handle_control_message(VirtIOConsolePort *port,
+ struct virtio_console_control *cpkt)
+{
+ switch(cpkt->event) {
+ case VIRTIO_CONSOLE_PORT_OPEN:
+ port->guest_connected = cpkt->value;
+ break;
+ }
}

+/* Guest wrote something to some port.
+ *
+ * Flush the data in the entire chunk that we received rather than
+ * splitting it into multiple buffers. VNC clients don't consume split
+ * buffers
+ */
static void virtio_console_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
- VirtIOConsole *s = to_virtio_console(vdev);
VirtQueueElement elem;

while (virtqueue_pop(vq, &elem)) {
- ssize_t len = 0;
- int d;
+ VirtIOConsolePort *port;
+ uint8_t *buf;
+ size_t totlen, buf_offset;
+ struct virtio_console_header header;
+ int header_len, i;
+
+ if (use_multiport()) {
+ header_len = sizeof(header);
+
+ memcpy(&header, elem.out_sg[0].iov_base, header_len);
+ port = get_port_from_id(header.id);
+ if (!port) {
+ continue;
+ }
+ } else {
+ header_len = 0;
+ port = get_port_from_id(0);
+ }
+ totlen = 0;
+ for (i = 0; i < elem.out_num; i++) {
+ totlen += elem.out_sg[i].iov_len;
+ }
+ buf = qemu_mallocz(totlen - header_len);
+ buf_offset = 0;
+ for (i = 0; i < elem.out_num; i++) {
+ size_t out_len = elem.out_sg[i].iov_len - header_len;
+
+ memcpy(buf + buf_offset, elem.out_sg[i].iov_base + header_len,
+ out_len);
+
+ buf_offset += out_len;
+ /* header is only sent with the first packet in each sg */
+ header_len = 0;
+ }
+ header_len = use_multiport() ? sizeof(header) : 0;

- for (d = 0; d < elem.out_num; d++) {
- len += qemu_chr_write(s->chr, (uint8_t *)elem.out_sg[d].iov_base,
- elem.out_sg[d].iov_len);
+ if (use_multiport() && header.internal_message) {
+ handle_control_message(port, (struct virtio_console_control *)buf);
+ } else {
+ flush_buf(header.id, port, buf, totlen - header_len);
}
- virtqueue_push(vq, &elem, len);
- virtio_notify(vdev, vq);
+ virtqueue_push(vq, &elem, totlen);
+ qemu_free(buf);
}
+ virtio_notify(vdev, vq);
}

static void virtio_console_handle_input(VirtIODevice *vdev, VirtQueue *vq)
@@ -53,56 +174,251 @@ static void virtio_console_handle_input(VirtIODevice *vdev, VirtQueue *vq)

static uint32_t virtio_console_get_features(VirtIODevice *vdev)
{
- return 0;
+ return 1 << VIRTIO_CONSOLE_F_MULTIPORT;
}

-static int vcon_can_read(void *opaque)
+static void virtio_console_set_features(VirtIODevice *vdev, uint32_t features)
{
- VirtIOConsole *s = (VirtIOConsole *) opaque;
+ virtio_console->guest_features = features;
+}

- if (!virtio_queue_ready(s->ivq) ||
- !(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
- virtio_queue_empty(s->ivq))
- return 0;
+/* Guest requested config info */
+static void virtio_console_get_config(VirtIODevice *vdev, uint8_t *config_data)
+{
+ memcpy(config_data, &virtcon_config, sizeof(struct virtio_console_config));
+}

- /* current implementations have a page sized buffer.
- * We fall back to a one byte per read if there is not enough room.
- * It would be cool to have a function that returns the available byte
- * instead of checking for a limit */
- if (virtqueue_avail_bytes(s->ivq, TARGET_PAGE_SIZE, 0))
- return TARGET_PAGE_SIZE;
- if (virtqueue_avail_bytes(s->ivq, 1, 0))
- return 1;
- return 0;
+static void virtio_console_set_config(VirtIODevice *vdev,
+ const uint8_t *config_data)
+{
+ struct virtio_console_config config;
+
+ memcpy(&config, config_data, sizeof(config));
}

-static void vcon_read(void *opaque, const uint8_t *buf, int size)
+static void write_to_port(VirtIOConsolePort *port,
+ const uint8_t *buf, size_t size, bool internal)
{
- VirtIOConsole *s = (VirtIOConsole *) opaque;
+ VirtQueue *vq = port->vcon->ivq;
VirtQueueElement elem;
- int offset = 0;
+ size_t offset = 0;
+ size_t len = 0;
+
+ if (!virtio_queue_ready(vq)) {
+ return;
+ }
+
+ if (!use_multiport() && internal) {
+ return;
+ }

- /* The current kernel implementation has only one outstanding input
- * buffer of PAGE_SIZE. Nevertheless, this function is prepared to
- * handle multiple buffers with multiple sg element for input */
while (offset < size) {
- int i = 0;
- if (!virtqueue_pop(s->ivq, &elem))
- break;
- while (offset < size && i < elem.in_num) {
- int len = MIN(elem.in_sg[i].iov_len, size - offset);
- memcpy(elem.in_sg[i].iov_base, buf + offset, len);
+ struct virtio_console_header header;
+ int i, header_len;
+
+ header_len = use_multiport() ? sizeof(header) : 0;
+
+ if (!virtqueue_pop(vq, &elem)) {
+ break;
+ }
+ if (elem.in_sg[0].iov_len < header_len) {
+ /* We can't even store our port number in this buffer. Bug? */
+ fprintf(stderr, "virtio-console: size %zd less than expected\n",
+ elem.in_sg[0].iov_len);
+ exit(1);
+ }
+ header.id = cpu_to_le32(get_id_from_port(port));
+ header.internal_message = internal;
+ memcpy(elem.in_sg[0].iov_base, &header, header_len);
+
+ for (i = 0; offset < size && i < elem.in_num; i++) {
+ len = MIN(elem.in_sg[i].iov_len - header_len, size - offset);
+
+ memcpy(elem.in_sg[i].iov_base + header_len, buf + offset, len);
offset += len;
- i++;
+ header_len = 0;
}
- virtqueue_push(s->ivq, &elem, size);
+ header_len = use_multiport() ? sizeof(header) : 0;
+ virtqueue_push(vq, &elem, len + header_len);
+ }
+ virtio_notify(&port->vcon->vdev, vq);
+}
+
+static void send_control_event(VirtIOConsolePort *port,
+ struct virtio_console_control *cpkt)
+{
+ write_to_port(port, (uint8_t *)cpkt, sizeof(*cpkt), true);
+}
+
+/* Readiness of the guest to accept data on a port */
+static int vcon_can_read(void *opaque)
+{
+ VirtIOConsolePort *port = (VirtIOConsolePort *) opaque;
+ VirtQueue *vq = port->vcon->ivq;
+ int size, header_len;
+
+ if (use_multiport()) {
+ header_len = sizeof(struct virtio_console_header);
+ } else {
+ header_len = 0;
+ }
+
+ if (!virtio_queue_ready(vq) ||
+ !(port->vcon->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
+ virtio_queue_empty(vq)) {
+ return 0;
+ }
+ if (!port->guest_connected) {
+ return 0;
}
- virtio_notify(&s->vdev, s->ivq);
+ size = TARGET_PAGE_SIZE;
+ if (virtqueue_avail_bytes(vq, size, 0)) {
+ return size - header_len;
+ }
+ size = header_len + 1;
+ if (virtqueue_avail_bytes(vq, size, 0)) {
+ return size - header_len;
+ }
+ return 0;
+}
+
+/* Send data from a char device over to the guest */
+static void vcon_read(void *opaque, const uint8_t *buf, int size)
+{
+ VirtIOConsolePort *port = (VirtIOConsolePort *) opaque;
+
+ write_to_port(port, buf, size, false);
}

static void vcon_event(void *opaque, int event)
{
- /* we will ignore any event for the time being */
+ VirtIOConsolePort *port = (VirtIOConsolePort *) opaque;
+ struct virtio_console_control cpkt;
+ bool update_needed;
+
+ cpkt.event = VIRTIO_CONSOLE_PORT_OPEN;
+
+ update_needed = false;
+ switch (event) {
+ case CHR_EVENT_RESET:
+ cpkt.value = 1;
+ update_needed = true;
+ break;
+ case CHR_EVENT_CLOSED:
+ cpkt.value = 0;
+ update_needed = true;
+ break;
+ default:
+ break;
+ }
+
+ if (!update_needed) {
+ return;
+ }
+ send_control_event(port, &cpkt);
+}
+
+static void virtio_console_set_port_active(uint32_t idx)
+{
+ int i = 0;
+
+ while (idx / 32) {
+ i++;
+ idx -= 32;
+ }
+ virtcon_config.ports_map[i] |= 1U << idx;
+}
+
+static bool virtio_console_is_port_active(uint32_t idx)
+{
+ int i = 0;
+
+ while (idx / 32) {
+ i++;
+ idx -= 32;
+ }
+ return virtcon_config.ports_map[i] & (1U << idx);
+}
+
+/* This function gets called from vl.c during initial options
+ * parsing as well as from the monitor to parse the options.
+ * So it's a good idea to not print out anything and just
+ * return values which can become meaningful.
+ */
+int init_virtio_console_port(int port, const char *opts)
+{
+ char dev[256];
+ const char *prot;
+ const char *idx;
+ uint32_t port_nr;
+ int j, k;
+
+ memset(dev, 0, sizeof(dev));
+ prot = strstr(opts, ",protocol=");
+ idx = strstr(opts, ",port=");
+
+ port_nr = 0;
+ if (idx) {
+ port_nr = atol(idx + 6); /* skip ',port=' */
+ }
+ if (port_nr >= MAX_VIRTIO_CONSOLE_PORTS) {
+ return -ENOSPC;
+ }
+ if (virtio_console_is_port_active(port_nr)) {
+ return -EEXIST;
+ }
+
+ /* Just to maintain compatibility with other qemu options,
+ * we have the format of
+ *
+ * -virtioconsole unix:/tmp/foo,protocol=bar,port=3
+ *
+ * so to parse the 'unix:', we have to do the following
+ */
+ j = k = 0;
+ while (opts[j] && &opts[j] != prot && &opts[j] != idx) {
+ dev[k++] = opts[j++];
+ }
+
+ if (dev[0] && strncmp(dev, "none", 4)) {
+ char label[32];
+ snprintf(label, sizeof(label), "virtcon%u", port_nr);
+ virtcon_hds[port] = qemu_chr_open(label, dev, NULL);
+ if (!virtcon_hds[port]) {
+ return -EIO;
+ }
+ }
+ virtcon_idx[port] = port_nr;
+ virtio_console_set_port_active(port_nr);
+
+ return 0;
+}
+
+void *virtio_console_new_port(PCIDevice *dev, uint32_t idx)
+{
+ VirtIOConsolePort *port;
+
+ port = get_port_from_id(idx);
+ port->vcon = virtio_console;
+
+ if (!port->vcon->dev && !dev) {
+ return NULL;
+ }
+ if (!port->vcon->dev) {
+ port->vcon->dev = dev;
+ }
+ /* Hot-adding ports to existing device */
+ if (!dev) {
+ dev = port->vcon->dev;
+ }
+ port->hd = qdev_init_chardev(&dev->qdev);
+ if (port->hd) {
+ qemu_chr_add_handlers(port->hd, vcon_can_read, vcon_read, vcon_event,
+ port);
+ }
+ /* Send an update to the guest about this new port added */
+ virtio_notify_config(&port->vcon->vdev);
+ return port;
}

static void virtio_console_save(QEMUFile *f, void *opaque)
@@ -128,19 +444,30 @@ VirtIODevice *virtio_console_init(DeviceState *dev)
VirtIOConsole *s;
s = (VirtIOConsole *)virtio_common_init("virtio-console",
VIRTIO_ID_CONSOLE,
- 0, sizeof(VirtIOConsole));
+ sizeof(struct virtio_console_config),
+ sizeof(VirtIOConsole));
if (s == NULL)
return NULL;

+ virtio_console = s;
s->vdev.get_features = virtio_console_get_features;
+ s->vdev.set_features = virtio_console_set_features;
+ s->vdev.get_config = virtio_console_get_config;
+ s->vdev.set_config = virtio_console_set_config;

+ /* Add queue for host to guest transfers */
s->ivq = virtio_add_queue(&s->vdev, 128, virtio_console_handle_input);
+ /* Add queue for guest to host transfers */
s->ovq = virtio_add_queue(&s->vdev, 128, virtio_console_handle_output);

- s->chr = qdev_init_chardev(dev);
- qemu_chr_add_handlers(s->chr, vcon_can_read, vcon_read, vcon_event, s);
+ /* Allocate space for the max. number of serial ports supported */
+ s->ports = qemu_mallocz(sizeof(VirtIOConsolePort) * MAX_VIRTIO_CONSOLE_PORTS);
+ s->config = &virtcon_config;
+
+ register_savevm("virtio-console", -1, 2, virtio_console_save, virtio_console_load, s);

- register_savevm("virtio-console", -1, 1, virtio_console_save, virtio_console_load, s);
+ virtcon_config.max_nr_ports = cpu_to_le32(MAX_VIRTIO_CONSOLE_PORTS);
+ virtcon_config.nr_active_ports = cpu_to_le32(virtcon_nr_ports);

return &s->vdev;
}
diff --git a/hw/virtio-console.h b/hw/virtio-console.h
index 84d0717..1b418b3 100644
--- a/hw/virtio-console.h
+++ b/hw/virtio-console.h
@@ -2,9 +2,11 @@
* Virtio Console Support
*
* Copyright IBM, Corp. 2008
+ * Copyright Red Hat, Inc. 2009
*
* Authors:
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
+ * Amit Shah <amit.shah@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
@@ -13,7 +15,52 @@
#ifndef _QEMU_VIRTIO_CONSOLE_H
#define _QEMU_VIRTIO_CONSOLE_H

+#include "sysemu.h"
+
+/* Interface shared between the guest kernel and qemu */
+
/* The ID for virtio console */
#define VIRTIO_ID_CONSOLE 3

+/* Invalid port number */
+#define VIRTIO_CONSOLE_BAD_ID (~(uint32_t)0)
+
+/* Port number at which the console is spawned */
+#define VIRTIO_CONSOLE_CONSOLE_PORT 0
+
+/* Features supported */
+#define VIRTIO_CONSOLE_F_MULTIPORT 1
+
+struct virtio_console_config
+{
+ /* These two fields are used by VIRTIO_CONSOLE_F_SIZE which
+ * isn't implemented here yet
+ */
+ uint16_t cols;
+ uint16_t rows;
+
+ uint32_t max_nr_ports;
+ uint32_t nr_active_ports;
+ uint32_t ports_map[(MAX_VIRTIO_CONSOLE_PORTS + 31) / 32];
+};
+
+struct virtio_console_control
+{
+ uint16_t event;
+ uint16_t value;
+};
+
+struct virtio_console_header {
+ uint32_t id; /* Port id */
+ bool internal_message; /* Some message between host and guest */
+} __attribute__((packed));
+
+/* Some events for the control channel */
+#define VIRTIO_CONSOLE_PORT_OPEN 0
+
+
+/* In-qemu interface */
+void virtio_console_monitor_command(Monitor *mon,
+ const char *command, const char *param);
+
#endif
diff --git a/monitor.c b/monitor.c
index 50a3cd2..9679de7 100644
--- a/monitor.c
+++ b/monitor.c
@@ -45,6 +45,7 @@
#include "kvm.h"
#include "acl.h"
#include "exec-all.h"
+#include "hw/virtio-console.h"

#include "qemu-kvm.h"

@@ -1824,6 +1825,12 @@ int monitor_get_fd(Monitor *mon, const char *fdname)
return -1;
}

+static void do_virtio_console_action(Monitor *mon,
+ const char *command, const char *param)
+{
+ virtio_console_monitor_command(mon, command, param);
+}
+
static const mon_cmd_t mon_cmds[] = {
#include "qemu-monitor.h"
{ NULL, NULL, },
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 0dc2ad7..3db5513 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -574,6 +574,16 @@ STEXI
Change watchdog action.
ETEXI

+ { "virtio-console", "ss?", do_virtio_console_action,
+ "<command> [<parameters>]\n",
+ "virtio-serial write port=3,key=get,value=clipboard\n"
+ "virtio-serial add_port\n"
+ "virtio-serial add_port port=6,name=foo,protocol=keyvalue\n" },
+STEXI
+@item virtio-console
+Hot-add ports or send data to virtio-console port
+ETEXI
+
{ "acl_show", "s", do_acl_show, "aclname",
"list rules in the access control list" },
STEXI
diff --git a/qemu-options.hx b/qemu-options.hx
index 0267496..8f83233 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1613,7 +1613,7 @@ ETEXI

DEF("virtioconsole", HAS_ARG, QEMU_OPTION_virtiocon, \
"-virtioconsole c\n" \
- " set virtio console\n")
+ " define virtio console\n")
STEXI
@item -virtioconsole @var{c}
Set virtio console.
diff --git a/sysemu.h b/sysemu.h
index c9f8a5a..53b82cb 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -2,6 +2,7 @@
#define SYSEMU_H
/* Misc. things related to the system emulator. */

+#include <stdbool.h>
#include "qemu-common.h"
#include "qemu-option.h"
#include "sys-queue.h"
@@ -227,9 +228,14 @@ extern CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];

/* virtio consoles */

-#define MAX_VIRTIO_CONSOLES 1
+#define MAX_VIRTIO_CONSOLE_PORTS 64
+#define VIRTIO_CONSOLE_PROTO_MAX_LEN 30

-extern CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
+extern CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLE_PORTS];
+extern uint32_t virtcon_idx[MAX_VIRTIO_CONSOLE_PORTS];
+extern int virtcon_nr_ports;
+extern int init_virtio_console_port(int port, const char *opts);
+extern void *virtio_console_new_port(PCIDevice *dev, uint32_t idx);

#define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)

diff --git a/vl.c b/vl.c
index dc1a820..677834e 100644
--- a/vl.c
+++ b/vl.c
@@ -214,7 +214,10 @@ static int no_frame = 0;
int no_quit = 0;
CharDriverState *serial_hds[MAX_SERIAL_PORTS];
CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
-CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
+CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLE_PORTS];
+char virtcon_prot[MAX_VIRTIO_CONSOLE_PORTS][VIRTIO_CONSOLE_PROTO_MAX_LEN];
+uint32_t virtcon_idx[MAX_VIRTIO_CONSOLE_PORTS];
+int virtcon_nr_ports;
#ifdef TARGET_I386
int win2k_install_hack = 0;
int rtc_td_hack = 0;
@@ -4858,8 +4861,7 @@ int main(int argc, char **argv, char **envp)
int serial_device_index;
const char *parallel_devices[MAX_PARALLEL_PORTS];
int parallel_device_index;
- const char *virtio_consoles[MAX_VIRTIO_CONSOLES];
- int virtio_console_index;
+ const char *virtio_consoles[MAX_VIRTIO_CONSOLE_PORTS];
const char *loadvm = NULL;
QEMUMachine *machine;
const char *cpu_model;
@@ -4933,9 +4935,9 @@ int main(int argc, char **argv, char **envp)
parallel_devices[i] = NULL;
parallel_device_index = 0;

- for(i = 0; i < MAX_VIRTIO_CONSOLES; i++)
+ for(i = 0; i < MAX_VIRTIO_CONSOLE_PORTS; i++)
virtio_consoles[i] = NULL;
- virtio_console_index = 0;
+ virtcon_nr_ports = 0;

for (i = 0; i < MAX_NODES; i++) {
node_mem[i] = 0;
@@ -5379,12 +5381,12 @@ int main(int argc, char **argv, char **envp)
}
break;
case QEMU_OPTION_virtiocon:
- if (virtio_console_index >= MAX_VIRTIO_CONSOLES) {
+ if (virtcon_nr_ports >= MAX_VIRTIO_CONSOLE_PORTS) {
fprintf(stderr, "qemu: too many virtio consoles\n");
exit(1);
}
- virtio_consoles[virtio_console_index] = optarg;
- virtio_console_index++;
+ virtio_consoles[virtcon_nr_ports] = optarg;
+ virtcon_nr_ports++;
break;
case QEMU_OPTION_parallel:
if (parallel_device_index >= MAX_PARALLEL_PORTS) {
@@ -6015,17 +6017,13 @@ int main(int argc, char **argv, char **envp)
}
}

- for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
- const char *devname = virtio_consoles[i];
- if (devname && strcmp(devname, "none")) {
- char label[32];
- snprintf(label, sizeof(label), "virtcon%d", i);
- virtcon_hds[i] = qemu_chr_open(label, devname, NULL);
- if (!virtcon_hds[i]) {
- fprintf(stderr, "qemu: could not open virtio console '%s'\n",
- devname);
- exit(1);
- }
+ for (i = 0; i < virtcon_nr_ports; i++) {
+ int ret;
+
+ ret = init_virtio_console_port(i, virtio_consoles[i]);
+ if (ret < 0) {
+ fprintf(stderr, "qemu: could not init virtio console port at \"%s\"\n", virtio_consoles[i]);
+ exit(1);
}
}

@@ -6140,11 +6138,12 @@ int main(int argc, char **argv, char **envp)
}
}

- for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
+ for(i = 0; i < MAX_VIRTIO_CONSOLE_PORTS; i++) {
const char *devname = virtio_consoles[i];
if (virtcon_hds[i] && devname) {
if (strstart(devname, "vc", 0))
- qemu_chr_printf(virtcon_hds[i], "virtio console%d\r\n", i);
+ qemu_chr_printf(virtcon_hds[i], "virtio console%d\r\n",
+ virtcon_idx[i]);
}
}

--
1.6.2.5