Seems there is a bug in qemu where the APIC version is being checked as
value 3. However, it should be 1.
static uint32_t apic_mem_readl(void *opaque, hwaddr addr)
{
...
switch(index) {
case 0x03: /* version */
val = 0x11 | ((APIC_LVT_NB - 1) << 16); /* version 0x11 */
break;
Comparing to KVM, it has the correct value:
static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
unsigned long addr,
unsigned long length)
{
unsigned long result = 0;
switch (ioapic->ioregsel) {
case IOAPIC_REG_VERSION:
result = ((((IOAPIC_NUM_PINS - 1) & 0xff) << 16)
| (IOAPIC_VERSION_ID & 0xff));
break;
./virt/kvm/ioapic.h:#define IOAPIC_REG_VERSION 0x01
I hit this as we have on OS that was checking for the number of IRQ pins
and we were falling into the default case.
Is this a known issue? What's the best way to submit a patch/get this
committed if it is an accepted bug?
tx
neil
