Remove old lguest I/O infrrasructure.

This patch gets rid of the old lguest host I/O infrastructure and
replaces it with a single hypercall "LHCALL_NOTIFY" which takes an
address.

The main change is the removal of io.c: that mainly did inter-guest
I/O, which virtio doesn't yet support.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 41b26e592d3..3aec29ec771 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -202,13 +202,12 @@ int run_guest(struct lguest *lg, unsigned long __user *user)
                 if (lg->hcall)
                         do_hypercalls(lg);
 
-                /* It's possible the Guest did a SEND_DMA hypercall to the
+                /* It's possible the Guest did a NOTIFY hypercall to the
                  * Launcher, in which case we return from the read() now. */
-                if (lg->dma_is_pending) {
-                        if (put_user(lg->pending_dma, user) ||
-                            put_user(lg->pending_key, user+1))
+                if (lg->pending_notify) {
+                        if (put_user(lg->pending_notify, user))
                                 return -EFAULT;
-                        return sizeof(unsigned long)*2;
+                        return sizeof(lg->pending_notify);
                 }
 
                 /* Check for signals */
@@ -288,9 +287,6 @@ static int __init init(void)
         if (err)
                 goto unmap;
 
-        /* The I/O subsystem needs some things initialized. */
-        lguest_io_init();
-
         /* We might need to reserve an interrupt vector. */
         err = init_interrupts();
         if (err)