[Xen-API] [PATCH 1 of 5 v2] common/sysctl: Introduce hypercall to query the console ring size

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

diff -r 66f563be41d9 -r 1306e69a7018 xen/common/sysctl.c
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -357,6 +357,9 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xe
     }
     break;
 
+    case XEN_SYSCTL_consoleringsize:
+        ret = console_ring_size(&op->u.consoleringsize);
+        break;
 
     default:
         ret = arch_do_sysctl(op, u_sysctl);
diff -r 66f563be41d9 -r 1306e69a7018 xen/drivers/char/console.c
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -226,6 +226,12 @@ long read_console_ring(struct xen_sysctl
     return 0;
 }
 
+long console_ring_size(struct xen_sysctl_consoleringsize * op)
+{
+    op->size = conring_size;
+    return 0;
+}
+
 
 /*
  * *******************************************************
diff -r 66f563be41d9 -r 1306e69a7018 xen/include/public/sysctl.h
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -596,6 +596,14 @@ struct xen_sysctl_scheduler_op {
 typedef struct xen_sysctl_scheduler_op xen_sysctl_scheduler_op_t;
 DEFINE_XEN_GUEST_HANDLE(xen_sysctl_scheduler_op_t);
 
+/* XEN_SYSCTL_consoleringsize */
+/* Get the size of the hypervisor console ring. */
+struct xen_sysctl_consoleringsize {
+    uint64_t size; /* Written by Xen. */
+};
+typedef struct xen_sysctl_consoleringsize xen_sysctl_consoleringsize_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_consoleringsize_t);
+
 struct xen_sysctl {
     uint32_t cmd;
 #define XEN_SYSCTL_readconsole                    1
@@ -616,6 +624,7 @@ struct xen_sysctl {
 #define XEN_SYSCTL_numainfo                      17
 #define XEN_SYSCTL_cpupool_op                    18
 #define XEN_SYSCTL_scheduler_op                  19
+#define XEN_SYSCTL_consoleringsize               20
     uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
     union {
         struct xen_sysctl_readconsole       readconsole;
@@ -636,6 +645,7 @@ struct xen_sysctl {
         struct xen_sysctl_lockprof_op       lockprof_op;
         struct xen_sysctl_cpupool_op        cpupool_op;
         struct xen_sysctl_scheduler_op      scheduler_op;
+        struct xen_sysctl_consoleringsize   consoleringsize;
         uint8_t                             pad[128];
     } u;
 };
diff -r 66f563be41d9 -r 1306e69a7018 xen/include/xen/console.h
--- a/xen/include/xen/console.h
+++ b/xen/include/xen/console.h
@@ -12,6 +12,8 @@
 
 struct xen_sysctl_readconsole;
 long read_console_ring(struct xen_sysctl_readconsole *op);
+struct xen_sysctl_consoleringsize;
+long console_ring_size(struct xen_sysctl_consoleringsize *op);
 
 void console_init_preirq(void);
 void console_init_postirq(void);

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