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lguest: per-vcpu interrupt processing.

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This patch adapts interrupt processing for using the vcpu struct.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Glauber de Oliveira Costa
2008-01-07 11:05:29 -02:00
committed by Rusty Russell
parent ad8d8f3bc6
commit 177e449dc5
5 changed files with 24 additions and 22 deletions
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24
drivers/lguest/interrupts_and_traps.c
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@@ -60,11 +60,12 @@ static void push_guest_stack(struct lguest *lg, unsigned long *gstack, u32 val)
* 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
@@ -129,9 +130,10 @@ static void set_guest_interrupt(struct lguest *lg, u32 lo, u32 hi, int has_err)
*
* 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;
@@ -145,7 +147,7 @@ void maybe_do_interrupt(struct lguest *lg)
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);
@@ -180,11 +182,11 @@ void maybe_do_interrupt(struct lguest *lg)
/* 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
@@ -245,19 +247,19 @@ static int has_err(unsigned int trap)
}
/* 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;
}
@@ -493,7 +495,7 @@ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer)
struct lg_cpu *cpu = container_of(timer, struct lg_cpu, hrt);
/* Remember the first interrupt is the timer interrupt. */
set_bit(0, cpu->lg->irqs_pending);
set_bit(0, cpu->irqs_pending);
/* If the Guest is actually stopped, we need to wake it up. */
if (cpu->lg->halted)
wake_up_process(cpu->lg->tsk);