[Xen-API] [PATCH 1 of 5 v4] common/sysctl: Introduce hypercall to query the console ring size

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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

--
Changes since v2:
 * Rebase on top of coverage patches.
 * Reword hypercall comments.

diff -r a6b81234b189 -r 89f3c6846f6b xen/common/sysctl.c
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -358,6 +358,10 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xe
     }
     break;
 
+    case XEN_SYSCTL_consoleringsize:
+        ret = console_ring_size(&op->u.consoleringsize);
+        break;
+
 #ifdef TEST_COVERAGE
     case XEN_SYSCTL_coverage_op:
         ret = sysctl_coverage_op(&op->u.coverage_op);
diff -r a6b81234b189 -r 89f3c6846f6b 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 a6b81234b189 -r 89f3c6846f6b xen/include/public/sysctl.h
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -632,6 +632,14 @@ typedef struct xen_sysctl_coverage_op xe
 DEFINE_XEN_GUEST_HANDLE(xen_sysctl_coverage_op_t);
 
 
+/* XEN_SYSCTL_consoleringsize */
+/* Get the size of the hypervisor console ring in bytes. */
+struct xen_sysctl_consoleringsize {
+    uint64_t size; /* OUT */
+};
+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
@@ -653,6 +661,7 @@ struct xen_sysctl {
 #define XEN_SYSCTL_cpupool_op                    18
 #define XEN_SYSCTL_scheduler_op                  19
 #define XEN_SYSCTL_coverage_op                   20
+#define XEN_SYSCTL_consoleringsize               21
     uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
     union {
         struct xen_sysctl_readconsole       readconsole;
@@ -674,6 +683,7 @@ struct xen_sysctl {
         struct xen_sysctl_cpupool_op        cpupool_op;
         struct xen_sysctl_scheduler_op      scheduler_op;
         struct xen_sysctl_coverage_op       coverage_op;
+        struct xen_sysctl_consoleringsize   consoleringsize;
         uint8_t                             pad[128];
     } u;
 };
diff -r a6b81234b189 -r 89f3c6846f6b 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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