From 7a8a749da7d30b420291fa0b11e3eda7f72d9b83 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Sat, 7 Jan 2023 16:17:51 +0000
Subject: [PATCH] hw/xen: Move xenstore_store_pv_console_info to xen_console.c

There's no need for this to be in the Xen accel code, and as we want to
use the Xen console support with KVM-emulated Xen we'll want to have a
platform-agnostic version of it. Make it use GString to build up the
path while we're at it.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
---
 accel/xen/xen-all.c   | 61 -------------------------------------------
 hw/char/xen_console.c | 45 +++++++++++++++++++++++++++++--
 include/hw/xen/xen.h  |  2 --
 3 files changed, 43 insertions(+), 65 deletions(-)

diff --git a/accel/xen/xen-all.c b/accel/xen/xen-all.c
index 425216230f..2d51c41e40 100644
--- a/accel/xen/xen-all.c
+++ b/accel/xen/xen-all.c
@@ -29,67 +29,6 @@ xc_interface *xen_xc;
 xenforeignmemory_handle *xen_fmem;
 xendevicemodel_handle *xen_dmod;
 
-static int store_dev_info(int domid, Chardev *cs, const char *string)
-{
-    struct xs_handle *xs = NULL;
-    char *path = NULL;
-    char *newpath = NULL;
-    char *pts = NULL;
-    int ret = -1;
-
-    /* Only continue if we're talking to a pty. */
-    if (!CHARDEV_IS_PTY(cs)) {
-        return 0;
-    }
-    pts = cs->filename + 4;
-
-    /* We now have everything we need to set the xenstore entry. */
-    xs = xs_open(0);
-    if (xs == NULL) {
-        fprintf(stderr, "Could not contact XenStore\n");
-        goto out;
-    }
-
-    path = xs_get_domain_path(xs, domid);
-    if (path == NULL) {
-        fprintf(stderr, "xs_get_domain_path() error\n");
-        goto out;
-    }
-    newpath = realloc(path, (strlen(path) + strlen(string) +
-                strlen("/tty") + 1));
-    if (newpath == NULL) {
-        fprintf(stderr, "realloc error\n");
-        goto out;
-    }
-    path = newpath;
-
-    strcat(path, string);
-    strcat(path, "/tty");
-    if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
-        fprintf(stderr, "xs_write for '%s' fail", string);
-        goto out;
-    }
-    ret = 0;
-
-out:
-    free(path);
-    xs_close(xs);
-
-    return ret;
-}
-
-void xenstore_store_pv_console_info(int i, Chardev *chr)
-{
-    if (i == 0) {
-        store_dev_info(xen_domid, chr, "/console");
-    } else {
-        char buf[32];
-        snprintf(buf, sizeof(buf), "/device/console/%d", i);
-        store_dev_info(xen_domid, chr, buf);
-    }
-}
-
-
 static void xenstore_record_dm_state(const char *state)
 {
     struct xs_handle *xs;
diff --git a/hw/char/xen_console.c b/hw/char/xen_console.c
index ad8638a86d..c7a19c0e7c 100644
--- a/hw/char/xen_console.c
+++ b/hw/char/xen_console.c
@@ -173,6 +173,48 @@ static void xencons_send(struct XenConsole *con)
 
 /* -------------------------------------------------------------------- */
 
+static int store_con_info(struct XenConsole *con)
+{
+    Chardev *cs = qemu_chr_fe_get_driver(&con->chr);
+    char *pts = NULL;
+    char *dom_path;
+    GString *path;
+    int ret = -1;
+
+    /* Only continue if we're talking to a pty. */
+    if (!CHARDEV_IS_PTY(cs)) {
+        return 0;
+    }
+    pts = cs->filename + 4;
+
+    dom_path = qemu_xen_xs_get_domain_path(xenstore, xen_domid);
+    if (!dom_path) {
+        return 0;
+    }
+
+    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");
+    }
+    g_string_append(path, "/tty");
+
+    if (xenstore_write_str(con->console, path->str, pts)) {
+        fprintf(stderr, "xenstore_write_str for '%s' fail", path->str);
+        goto out;
+    }
+    ret = 0;
+
+out:
+    g_string_free(path, true);
+    free(path);
+
+    return ret;
+}
+
 static int con_init(struct XenLegacyDevice *xendev)
 {
     struct XenConsole *con = container_of(xendev, struct XenConsole, xendev);
@@ -215,8 +257,7 @@ static int con_init(struct XenLegacyDevice *xendev)
                          &error_abort);
     }
 
-    xenstore_store_pv_console_info(con->xendev.dev,
-                                   qemu_chr_fe_get_driver(&con->chr));
+    store_con_info(con);
 
 out:
     g_free(type);
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index 03983939f9..56b1c2a827 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -39,8 +39,6 @@ int xen_is_pirq_msi(uint32_t msi_data);
 
 qemu_irq *xen_interrupt_controller_init(void);
 
-void xenstore_store_pv_console_info(int i, Chardev *chr);
-
 void xen_register_framebuffer(struct MemoryRegion *mr);
 
 #endif /* QEMU_HW_XEN_H */