diff options
Diffstat (limited to 'drivers/lguest/hypercalls.c')
| -rw-r--r-- | drivers/lguest/hypercalls.c | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 05fad6fa8049..7827671b2234 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -29,8 +29,10 @@ /*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 @@ -93,7 +95,7 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args) break; default: /* It should be an architecture-specific hypercall. */ - if (lguest_arch_do_hcall(lg, args)) + if (lguest_arch_do_hcall(cpu, args)) kill_guest(lg, "Bad hypercall %li\n", args->arg0); } } @@ -106,10 +108,11 @@ static void do_hcall(struct lguest *lg, struct hcall_args *args) * 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))) @@ -121,7 +124,7 @@ static void do_async_hcalls(struct lguest *lg) /* 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) @@ -129,8 +132,8 @@ static void do_async_hcalls(struct lguest *lg) /* 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. */ @@ -141,7 +144,7 @@ static void do_async_hcalls(struct lguest *lg) } /* 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])) { @@ -158,16 +161,17 @@ static void do_async_hcalls(struct lguest *lg) /* 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 @@ -196,27 +200,27 @@ static void initialize(struct lguest *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 * NOTIFY to the Launcher, we want to return now. Otherwise we do * the hypercall. */ - if (!lg->pending_notify) { - 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. @@ -227,7 +231,7 @@ void do_hypercalls(struct lguest *lg) * 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; } } |