/*H:120 This is the core hypercall routine: where the Guest gets what it wants.
* Or gets killed. Or, in the case of LHCALL_CRASH, both. */
-static void do_hcall(struct lguest *lg, struct hcall_args *args)
+static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
{
+ struct lguest *lg = cpu->lg;
+
switch (args->arg0) {
case LHCALL_FLUSH_ASYNC:
/* This call does nothing, except by breaking out of the Guest
* do that. */
kill_guest(lg, "already have lguest_data");
break;
- case LHCALL_CRASH: {
- /* Crash is such a trivial hypercall that we do it in four
+ case LHCALL_SHUTDOWN: {
+ /* Shutdown is such a trivial hypercall that we do it in four
* lines right here. */
char msg[128];
/* If the lgread fails, it will call kill_guest() itself; the
* kill_guest() with the message will be ignored. */
- lgread(lg, msg, args->arg1, sizeof(msg));
+ __lgread(lg, msg, args->arg1, sizeof(msg));
msg[sizeof(msg)-1] = '\0';
kill_guest(lg, "CRASH: %s", msg);
+ if (args->arg2 == LGUEST_SHUTDOWN_RESTART)
+ lg->dead = ERR_PTR(-ERESTART);
break;
}
case LHCALL_FLUSH_TLB:
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;
guest_set_stack(lg, args->arg1, args->arg2, args->arg3);
break;
case LHCALL_SET_PTE:
- guest_set_pte(lg, args->arg1, args->arg2, mkgpte(args->arg3));
+ guest_set_pte(lg, args->arg1, args->arg2, __pte(args->arg3));
break;
case LHCALL_SET_PMD:
guest_set_pmd(lg, args->arg1, args->arg2);
break;
case LHCALL_SET_CLOCKEVENT:
- guest_set_clockevent(lg, args->arg1);
+ guest_set_clockevent(cpu, args->arg1);
break;
case LHCALL_TS:
/* This sets the TS flag, as we saw used in run_guest(). */
/* 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))
+ /* It should be an architecture-specific hypercall. */
+ if (lguest_arch_do_hcall(cpu, args))
kill_guest(lg, "Bad hypercall %li\n", args->arg0);
}
}
* Guest put them in the ring, but we also promise the Guest that they will
* happen before any normal hypercall (which is why we check this before
* checking for a normal hcall). */
-static void do_async_hcalls(struct lguest *lg)
+static void do_async_hcalls(struct lg_cpu *cpu)
{
unsigned int i;
u8 st[LHCALL_RING_SIZE];
+ struct lguest *lg = cpu->lg;
/* For simplicity, we copy the entire call status array in at once. */
if (copy_from_user(&st, &lg->lguest_data->hcall_status, sizeof(st)))
/* We remember where we were up to from last time. This makes
* sure that the hypercalls are done in the order the Guest
* places them in the ring. */
- unsigned int n = lg->next_hcall;
+ unsigned int n = cpu->next_hcall;
/* 0xFF means there's no call here (yet). */
if (st[n] == 0xFF)
/* OK, we have hypercall. Increment the "next_hcall" cursor,
* and wrap back to 0 if we reach the end. */
- if (++lg->next_hcall == LHCALL_RING_SIZE)
- lg->next_hcall = 0;
+ if (++cpu->next_hcall == LHCALL_RING_SIZE)
+ cpu->next_hcall = 0;
/* Copy the hypercall arguments into a local copy of
* the hcall_args struct. */
}
/* Do the hypercall, same as a normal one. */
- do_hcall(lg, &args);
+ do_hcall(cpu, &args);
/* Mark the hypercall done. */
if (put_user(0xFF, &lg->lguest_data->hcall_status[n])) {
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;
}
}
/* Last of all, we look at what happens first of all. The very first time the
* Guest makes a hypercall, we end up here to set things up: */
-static void initialize(struct lguest *lg)
+static void initialize(struct lg_cpu *cpu)
{
-
+ struct lguest *lg = cpu->lg;
/* You can't do anything until you're initialized. The Guest knows the
* rules, so we're unforgiving here. */
- if (lg->hcall->arg0 != LHCALL_LGUEST_INIT) {
- kill_guest(lg, "hypercall %li before INIT", lg->hcall->arg0);
+ if (cpu->hcall->arg0 != LHCALL_LGUEST_INIT) {
+ kill_guest(lg, "hypercall %li before INIT", cpu->hcall->arg0);
return;
}
- if (lguest_arch_init_hypercalls(lg))
+ if (lguest_arch_init_hypercalls(cpu))
kill_guest(lg, "bad guest page %p", lg->lguest_data);
/* The Guest tells us where we're not to deliver interrupts by putting
* the range of addresses into "struct lguest_data". */
if (get_user(lg->noirq_start, &lg->lguest_data->noirq_start)
- || get_user(lg->noirq_end, &lg->lguest_data->noirq_end)
- /* We tell the Guest that it can't use the top 4MB of virtual
- * addresses used by the Switcher. */
- || put_user(4U*1024*1024, &lg->lguest_data->reserve_mem))
+ || get_user(lg->noirq_end, &lg->lguest_data->noirq_end))
kill_guest(lg, "bad guest page %p", lg->lguest_data);
- /* We write the current time into the Guest's data page once now. */
+ /* We write the current time into the Guest's data page once so it can
+ * set its clock. */
write_timestamp(lg);
+ /* page_tables.c will also do some setup. */
+ page_table_guest_data_init(lg);
+
/* This is the one case where the above accesses might have been the
* first write to a Guest page. This may have caused a copy-on-write
- * fault, but the Guest might be referring to the old (read-only)
- * page. */
+ * fault, but the old page might be (read-only) in the Guest
+ * pagetable. */
guest_pagetable_clear_all(lg);
}
* Remember from the Guest, hypercalls come in two flavors: normal and
* asynchronous. This file handles both of types.
*/
-void do_hypercalls(struct lguest *lg)
+void do_hypercalls(struct lg_cpu *cpu)
{
/* Not initialized yet? This hypercall must do it. */
- if (unlikely(!lg->lguest_data)) {
+ if (unlikely(!cpu->lg->lguest_data)) {
/* Set up the "struct lguest_data" */
- initialize(lg);
+ initialize(cpu);
/* Hcall is done. */
- lg->hcall = NULL;
+ cpu->hcall = NULL;
return;
}
/* The Guest has initialized.
*
* Look in the hypercall ring for the async hypercalls: */
- do_async_hcalls(lg);
+ do_async_hcalls(cpu);
/* 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) {
- do_hcall(lg, lg->hcall);
+ if (!cpu->lg->pending_notify) {
+ do_hcall(cpu, cpu->hcall);
/* Tricky point: we reset the hcall pointer to mark the
* hypercall as "done". We use the hcall pointer rather than
* the trap number to indicate a hypercall is pending.
* Normally it doesn't matter: the Guest will run again and
* update the trap number before we come back here.
*
- * However, if we are signalled or the Guest sends DMA to the
+ * However, if we are signalled or the Guest sends I/O to the
* Launcher, the run_guest() loop will exit without running the
* Guest. When it comes back it would try to re-run the
* hypercall. */
- lg->hcall = NULL;
+ cpu->hcall = NULL;
}
}
projects / powerpc.git / blobdiff