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Remove old lguest I/O infrrasructure.

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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>
This commit is contained in:
Rusty Russell
2007-10-22 11:24:10 +10:00
parent 0ca49ca946
commit 15045275c3
8 changed files with 21 additions and 752 deletions
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26
drivers/lguest/hypercalls.c
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@@ -60,22 +60,9 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args)
else
guest_pagetable_flush_user(lg);
break;
case LHCALL_BIND_DMA:
/* BIND_DMA really wants four arguments, but it's the only call
* which does. So the Guest packs the number of buffers and
* the interrupt number into the final argument, and we decode
* it here. This can legitimately fail, since we currently
* place a limit on the number of DMA pools a Guest can have.
* So we return true or false from this call. */
args->arg0 = bind_dma(lg, args->arg1, args->arg2,
args->arg3 >> 8, args->arg3 & 0xFF);
break;
/* All these calls simply pass the arguments through to the right
* routines. */
case LHCALL_SEND_DMA:
send_dma(lg, args->arg1, args->arg2);
break;
case LHCALL_NEW_PGTABLE:
guest_new_pagetable(lg, args->arg1);
break;
@@ -99,6 +86,9 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args)
/* Similarly, this sets the halted flag for run_guest(). */
lg->halted = 1;
break;
case LHCALL_NOTIFY:
lg->pending_notify = args->arg1;
break;
default:
if (lguest_arch_do_hcall(lg, args))
kill_guest(lg, "Bad hypercall %li\n", args->arg0);
@@ -156,9 +146,9 @@ static void do_async_hcalls(struct lguest *lg)
break;
}
/* Stop doing hypercalls if we've just done a DMA to the
* Launcher: it needs to service this first. */
if (lg->dma_is_pending)
/* Stop doing hypercalls if they want to notify the Launcher:
* it needs to service this first. */
if (lg->pending_notify)
break;
}
}
@@ -220,9 +210,9 @@ void do_hypercalls(struct lguest *lg)
do_async_hcalls(lg);
/* If we stopped reading the hypercall ring because the Guest did a
* SEND_DMA to the Launcher, we want to return now. Otherwise we do
* NOTIFY to the Launcher, we want to return now. Otherwise we do
* the hypercall. */
if (!lg->dma_is_pending) {
if (!lg->pending_notify) {
do_hcall(lg, lg->hcall);
/* Tricky point: we reset the hcall pointer to mark the
* hypercall as "done". We use the hcall pointer rather than