* We set up the stack just like the CPU does for a real interrupt, so it's
* identical for the Guest (and the standard "iret" instruction will undo
* it). */
-static void set_guest_interrupt(struct lguest *lg, u32 lo, u32 hi, int has_err)
+static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err)
{
unsigned long gstack, origstack;
u32 eflags, ss, irq_enable;
unsigned long virtstack;
+ struct lguest *lg = cpu->lg;
/* There are two cases for interrupts: one where the Guest is already
* in the kernel, and a more complex one where the Guest is in
* userspace. We check the privilege level to find out. */
- if ((lg->regs->ss&0x3) != GUEST_PL) {
+ if ((cpu->regs->ss&0x3) != GUEST_PL) {
/* The Guest told us their kernel stack with the SET_STACK
* hypercall: both the virtual address and the segment */
virtstack = lg->esp1;
* stack: when the Guest does an "iret" back from the interrupt
* handler the CPU will notice they're dropping privilege
* levels and expect these here. */
- push_guest_stack(lg, &gstack, lg->regs->ss);
- push_guest_stack(lg, &gstack, lg->regs->esp);
+ push_guest_stack(lg, &gstack, cpu->regs->ss);
+ push_guest_stack(lg, &gstack, cpu->regs->esp);
} else {
/* We're staying on the same Guest (kernel) stack. */
- virtstack = lg->regs->esp;
- ss = lg->regs->ss;
+ virtstack = cpu->regs->esp;
+ ss = cpu->regs->ss;
origstack = gstack = guest_pa(lg, virtstack);
}
* the "Interrupt Flag" bit is always set. We copy that bit from the
* Guest's "irq_enabled" field into the eflags word: we saw the Guest
* copy it back in "lguest_iret". */
- eflags = lg->regs->eflags;
+ eflags = cpu->regs->eflags;
if (get_user(irq_enable, &lg->lguest_data->irq_enabled) == 0
&& !(irq_enable & X86_EFLAGS_IF))
eflags &= ~X86_EFLAGS_IF;
* "eflags" word, the old code segment, and the old instruction
* pointer. */
push_guest_stack(lg, &gstack, eflags);
- push_guest_stack(lg, &gstack, lg->regs->cs);
- push_guest_stack(lg, &gstack, lg->regs->eip);
+ push_guest_stack(lg, &gstack, cpu->regs->cs);
+ push_guest_stack(lg, &gstack, cpu->regs->eip);
/* For the six traps which supply an error code, we push that, too. */
if (has_err)
- push_guest_stack(lg, &gstack, lg->regs->errcode);
+ push_guest_stack(lg, &gstack, cpu->regs->errcode);
/* Now we've pushed all the old state, we change the stack, the code
* segment and the address to execute. */
- lg->regs->ss = ss;
- lg->regs->esp = virtstack + (gstack - origstack);
- lg->regs->cs = (__KERNEL_CS|GUEST_PL);
- lg->regs->eip = idt_address(lo, hi);
+ cpu->regs->ss = ss;
+ cpu->regs->esp = virtstack + (gstack - origstack);
+ cpu->regs->cs = (__KERNEL_CS|GUEST_PL);
+ cpu->regs->eip = idt_address(lo, hi);
/* There are two kinds of interrupt handlers: 0xE is an "interrupt
* gate" which expects interrupts to be disabled on entry. */
*
* maybe_do_interrupt() gets called before every entry to the Guest, to see if
* we should divert the Guest to running an interrupt handler. */
-void maybe_do_interrupt(struct lguest *lg)
+void maybe_do_interrupt(struct lg_cpu *cpu)
{
unsigned int irq;
+ struct lguest *lg = cpu->lg;
DECLARE_BITMAP(blk, LGUEST_IRQS);
struct desc_struct *idt;
sizeof(blk)))
return;
- bitmap_andnot(blk, lg->irqs_pending, blk, LGUEST_IRQS);
+ bitmap_andnot(blk, cpu->irqs_pending, blk, LGUEST_IRQS);
/* Find the first interrupt. */
irq = find_first_bit(blk, LGUEST_IRQS);
/* They may be in the middle of an iret, where they asked us never to
* deliver interrupts. */
- if (lg->regs->eip >= lg->noirq_start && lg->regs->eip < lg->noirq_end)
+ if (cpu->regs->eip >= lg->noirq_start && cpu->regs->eip < lg->noirq_end)
return;
/* If they're halted, interrupts restart them. */
/* If they don't have a handler (yet?), we just ignore it */
if (idt_present(idt->a, idt->b)) {
/* OK, mark it no longer pending and deliver it. */
- clear_bit(irq, lg->irqs_pending);
+ clear_bit(irq, cpu->irqs_pending);
/* set_guest_interrupt() takes the interrupt descriptor and a
* flag to say whether this interrupt pushes an error code onto
* the stack as well: virtual interrupts never do. */
- set_guest_interrupt(lg, idt->a, idt->b, 0);
+ set_guest_interrupt(cpu, idt->a, idt->b, 0);
}
/* Every time we deliver an interrupt, we update the timestamp in the
}
/* deliver_trap() returns true if it could deliver the trap. */
-int deliver_trap(struct lguest *lg, unsigned int num)
+int deliver_trap(struct lg_cpu *cpu, unsigned int num)
{
/* Trap numbers are always 8 bit, but we set an impossible trap number
* for traps inside the Switcher, so check that here. */
- if (num >= ARRAY_SIZE(lg->arch.idt))
+ if (num >= ARRAY_SIZE(cpu->lg->arch.idt))
return 0;
/* Early on the Guest hasn't set the IDT entries (or maybe it put a
* bogus one in): if we fail here, the Guest will be killed. */
- if (!idt_present(lg->arch.idt[num].a, lg->arch.idt[num].b))
+ if (!idt_present(cpu->lg->arch.idt[num].a, cpu->lg->arch.idt[num].b))
return 0;
- set_guest_interrupt(lg, lg->arch.idt[num].a, lg->arch.idt[num].b,
- has_err(num));
+ set_guest_interrupt(cpu, cpu->lg->arch.idt[num].a,
+ cpu->lg->arch.idt[num].b, has_err(num));
return 1;
}
* infrastructure to set a callback at that time.
*
* 0 means "turn off the clock". */
-void guest_set_clockevent(struct lguest *lg, unsigned long delta)
+void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta)
{
ktime_t expires;
if (unlikely(delta == 0)) {
/* Clock event device is shutting down. */
- hrtimer_cancel(&lg->hrt);
+ hrtimer_cancel(&cpu->hrt);
return;
}
* all the time between now and the timer interrupt it asked for. This
* is almost always the right thing to do. */
expires = ktime_add_ns(ktime_get_real(), delta);
- hrtimer_start(&lg->hrt, expires, HRTIMER_MODE_ABS);
+ hrtimer_start(&cpu->hrt, expires, HRTIMER_MODE_ABS);
}
/* This is the function called when the Guest's timer expires. */
static enum hrtimer_restart clockdev_fn(struct hrtimer *timer)
{
- struct lguest *lg = container_of(timer, struct lguest, hrt);
+ struct lg_cpu *cpu = container_of(timer, struct lg_cpu, hrt);
/* Remember the first interrupt is the timer interrupt. */
- set_bit(0, lg->irqs_pending);
+ set_bit(0, cpu->irqs_pending);
/* If the Guest is actually stopped, we need to wake it up. */
- if (lg->halted)
- wake_up_process(lg->tsk);
+ if (cpu->lg->halted)
+ wake_up_process(cpu->lg->tsk);
return HRTIMER_NORESTART;
}
/* This sets up the timer for this Guest. */
-void init_clockdev(struct lguest *lg)
+void init_clockdev(struct lg_cpu *cpu)
{
- hrtimer_init(&lg->hrt, CLOCK_REALTIME, HRTIMER_MODE_ABS);
- lg->hrt.function = clockdev_fn;
+ hrtimer_init(&cpu->hrt, CLOCK_REALTIME, HRTIMER_MODE_ABS);
+ cpu->hrt.function = clockdev_fn;
}
projects / deliverable / linux.git / blobdiff