[Xen-devel] [PATCH 3 of 5] tools/libxc: Implement of xc_readconsolering_buffer

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Functions identically to xc_readconsolering(), but uses a user-provided
xc_hypercall_buffer_t to save using a bounce buffer.

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

diff -r 40d1bab1b996 -r 6b8c513cff4f tools/libxc/xc_misc.c
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -100,6 +100,37 @@ int xc_readconsolering(xc_interface *xch
     return ret;
 }
 
+int xc_readconsolering_buffer(xc_interface *xch,
+                              xc_hypercall_buffer_t *buffer,
+                              unsigned int *pnr_chars,
+                              int clear, int incremental, uint32_t *pindex)
+{
+    int ret;
+    unsigned int nr_chars = *pnr_chars;
+    DECLARE_SYSCTL;
+    DECLARE_HYPERCALL_BUFFER_ARGUMENT(buffer);
+
+    sysctl.cmd = XEN_SYSCTL_readconsole;
+    set_xen_guest_handle(sysctl.u.readconsole.buffer, buffer);
+    sysctl.u.readconsole.count = nr_chars;
+    sysctl.u.readconsole.clear = clear;
+    sysctl.u.readconsole.incremental = 0;
+    if ( pindex )
+    {
+        sysctl.u.readconsole.index = *pindex;
+        sysctl.u.readconsole.incremental = incremental;
+    }
+
+    if ( (ret = do_sysctl(xch, &sysctl)) == 0 )
+    {
+        *pnr_chars = sysctl.u.readconsole.count;
+        if ( pindex )
+            *pindex = sysctl.u.readconsole.index;
+    }
+
+    return ret;
+}
+
 int xc_consoleringsize(xc_interface *xch, uint64_t * psize)
 {
     int ret = -1;
diff -r 40d1bab1b996 -r 6b8c513cff4f tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -998,6 +998,10 @@ int xc_readconsolering(xc_interface *xch
                        char *buffer,
                        unsigned int *pnr_chars,
                        int clear, int incremental, uint32_t *pindex);
+int xc_readconsolering_buffer(xc_interface *xch,
+                              xc_hypercall_buffer_t *buffer,
+                              unsigned int *pnr_chars,
+                              int clear, int incremental, uint32_t *pindex);
 int xc_consoleringsize(xc_interface *xch, uint64_t * psize);
 
 int xc_send_debug_keys(xc_interface *xch, char *keys);

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