On 08/20/2009 08:36 PM, Saksena, Abhishek wrote:
Thnaks,
So just programming of PIC (8259) should do the trick. Do I have to care about IOAPIC or LAPIC programming? You mentioned lapic is disabled by default, what about IOAPIC.
The ioapic will not have any vectors programmed so it will do nothing.
I see in x86.c
case KVM_CREATE_IRQCHIP:
r = -ENOMEM;
kvm->arch.vpic = kvm_create_pic(kvm);
if (kvm->arch.vpic) {
r = kvm_ioapic_init(kvm);
if (r) {
kfree(kvm->arch.vpic);
kvm->arch.vpic = NULL;
goto out;
}
} else
goto out;
break;
so ioapic is created.
I have enabled all the interrupts in 8259s correctly
PIC Programming of master and slave 8259s
;; PIC
mov al, #0x00
out 0x21, AL ;master pic: all IRQs unmasked
out 0xA1, AL ;slave pic: all IRQs unmasked
PIT Programming
SET_INT_VECTOR(0x08, #0xF000, #int08_handler)
mov al, #0x34 ; timer0: binary count, 16bit count, mode 2
out 0x43, al
mov al, #0x00 ; maximum count of 0000H = 18.2Hz
out 0x40, al
out 0x40, al
But still not see PIT interrupts or Timer ISR being called!
I suggest adding printk()s (or trace_printk()s) in stragtegic places to
see what's going on. It can be either a guest programming error or host
bug.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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