lguest: get rid of lg variable assignments
We can save some lines of code by getting rid of
*lg = cpu... lines of code spread everywhere by now.
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c
index 0471018..32666d0 100644
--- a/drivers/lguest/hypercalls.c
+++ b/drivers/lguest/hypercalls.c
@@ -31,8 +31,6 @@
* Or gets killed. Or, in the case of LHCALL_CRASH, both. */
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
@@ -41,7 +39,7 @@
case LHCALL_LGUEST_INIT:
/* You can't get here unless you're already initialized. Don't
* do that. */
- kill_guest(lg, "already have lguest_data");
+ kill_guest(cpu, "already have lguest_data");
break;
case LHCALL_SHUTDOWN: {
/* Shutdown is such a trivial hypercall that we do it in four
@@ -49,11 +47,11 @@
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(cpu, msg, args->arg1, sizeof(msg));
msg[sizeof(msg)-1] = '\0';
- kill_guest(lg, "CRASH: %s", msg);
+ kill_guest(cpu, "CRASH: %s", msg);
if (args->arg2 == LGUEST_SHUTDOWN_RESTART)
- lg->dead = ERR_PTR(-ERESTART);
+ cpu->lg->dead = ERR_PTR(-ERESTART);
break;
}
case LHCALL_FLUSH_TLB:
@@ -74,10 +72,10 @@
guest_set_stack(cpu, args->arg1, args->arg2, args->arg3);
break;
case LHCALL_SET_PTE:
- guest_set_pte(lg, args->arg1, args->arg2, __pte(args->arg3));
+ guest_set_pte(cpu, args->arg1, args->arg2, __pte(args->arg3));
break;
case LHCALL_SET_PMD:
- guest_set_pmd(lg, args->arg1, args->arg2);
+ guest_set_pmd(cpu->lg, args->arg1, args->arg2);
break;
case LHCALL_SET_CLOCKEVENT:
guest_set_clockevent(cpu, args->arg1);
@@ -96,7 +94,7 @@
default:
/* It should be an architecture-specific hypercall. */
if (lguest_arch_do_hcall(cpu, args))
- kill_guest(lg, "Bad hypercall %li\n", args->arg0);
+ kill_guest(cpu, "Bad hypercall %li\n", args->arg0);
}
}
/*:*/
@@ -112,10 +110,9 @@
{
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)))
+ if (copy_from_user(&st, &cpu->lg->lguest_data->hcall_status, sizeof(st)))
return;
/* We process "struct lguest_data"s hcalls[] ring once. */
@@ -137,9 +134,9 @@
/* Copy the hypercall arguments into a local copy of
* the hcall_args struct. */
- if (copy_from_user(&args, &lg->lguest_data->hcalls[n],
+ if (copy_from_user(&args, &cpu->lg->lguest_data->hcalls[n],
sizeof(struct hcall_args))) {
- kill_guest(lg, "Fetching async hypercalls");
+ kill_guest(cpu, "Fetching async hypercalls");
break;
}
@@ -147,8 +144,8 @@
do_hcall(cpu, &args);
/* Mark the hypercall done. */
- if (put_user(0xFF, &lg->lguest_data->hcall_status[n])) {
- kill_guest(lg, "Writing result for async hypercall");
+ if (put_user(0xFF, &cpu->lg->lguest_data->hcall_status[n])) {
+ kill_guest(cpu, "Writing result for async hypercall");
break;
}
@@ -163,29 +160,28 @@
* Guest makes a hypercall, we end up here to set things up: */
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 (cpu->hcall->arg0 != LHCALL_LGUEST_INIT) {
- kill_guest(lg, "hypercall %li before INIT", cpu->hcall->arg0);
+ kill_guest(cpu, "hypercall %li before INIT", cpu->hcall->arg0);
return;
}
if (lguest_arch_init_hypercalls(cpu))
- kill_guest(lg, "bad guest page %p", lg->lguest_data);
+ kill_guest(cpu, "bad guest page %p", cpu->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))
- kill_guest(lg, "bad guest page %p", lg->lguest_data);
+ if (get_user(cpu->lg->noirq_start, &cpu->lg->lguest_data->noirq_start)
+ || get_user(cpu->lg->noirq_end, &cpu->lg->lguest_data->noirq_end))
+ kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data);
/* We write the current time into the Guest's data page once so it can
* set its clock. */
- write_timestamp(lg);
+ write_timestamp(cpu);
/* page_tables.c will also do some setup. */
- page_table_guest_data_init(lg);
+ page_table_guest_data_init(cpu);
/* 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
@@ -237,10 +233,11 @@
/* This routine supplies the Guest with time: it's used for wallclock time at
* initial boot and as a rough time source if the TSC isn't available. */
-void write_timestamp(struct lguest *lg)
+void write_timestamp(struct lg_cpu *cpu)
{
struct timespec now;
ktime_get_real_ts(&now);
- if (copy_to_user(&lg->lguest_data->time, &now, sizeof(struct timespec)))
- kill_guest(lg, "Writing timestamp");
+ if (copy_to_user(&cpu->lg->lguest_data->time,
+ &now, sizeof(struct timespec)))
+ kill_guest(cpu, "Writing timestamp");
}