libxl, minios: stubdom console based save/restore

Add two "special" PV consoles to stubdoms that are going to be used
to send and receive the qemu-xen save files on save/restore.

Use the second PV console to send the qemu-xen save file and the third
PV console to receive the qemu-xen save file on restore.

Fix the console shutdown function free_consfront that is called when the
qemu save file is closed.

Stubdom save/restore is still broken with xend.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 66ed7382cd..8277f53493 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -737,7 +737,8 @@ int libxl_primary_console_exec(libxl_ctx *ctx, uint32_t domid_vm)
 {
     uint32_t stubdomid = libxl_get_stubdom_id(ctx, domid_vm);
     if (stubdomid)
-        return libxl_console_exec(ctx, stubdomid, 1, LIBXL_CONSTYPE_PV);
+        return libxl_console_exec(ctx, stubdomid,
+                STUBDOM_CONSOLE_SERIAL, LIBXL_CONSTYPE_PV);
     else {
         if (libxl__domain_is_hvm(ctx, domid_vm))
             return libxl_console_exec(ctx, domid_vm, 0, LIBXL_CONSTYPE_SERIAL);