diff options
Diffstat (limited to 'hw/intc/ioapic.c')
| -rw-r--r-- | hw/intc/ioapic.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c index 4f42b911a2..c27ee83722 100644 --- a/hw/intc/ioapic.c +++ b/hw/intc/ioapic.c @@ -281,6 +281,7 @@ ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val, default: index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1; if (index >= 0 && index < IOAPIC_NUM_PINS) { + uint64_t ro_bits = s->ioredtbl[index] & IOAPIC_RO_BITS; if (s->ioregsel & 1) { s->ioredtbl[index] &= 0xffffffff; s->ioredtbl[index] |= (uint64_t)val << 32; @@ -288,6 +289,9 @@ ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val, s->ioredtbl[index] &= ~0xffffffffULL; s->ioredtbl[index] |= val; } + /* restore RO bits */ + s->ioredtbl[index] &= IOAPIC_RW_BITS; + s->ioredtbl[index] |= ro_bits; ioapic_service(s); } } |