This fixes byte accesses to IOAPIC_REG_SELECT as mandated by at least the
ICH10 and Intel Series 5 chipset specs. It also makes ioapic_mmio_write
consistent with ioapic_mmio_read, which also allows byte and word accesses.
Signed-off-by: Julian Stecklina <j...@alien8.de>
---
virt/kvm/ioapic.c | 17 +++++++++++++----
1 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 3eed61e..e94ef6ba 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -332,9 +332,18 @@ static int ioapic_mmio_write(struct kvm_io_device *this,
gpa_t addr, int len,
(void*)addr, len, val);
ASSERT(!(addr & 0xf)); /* check alignment */
- if (len == 4 || len == 8)
- data = *(u32 *) val;
- else {
+ switch (len) {
+ case 8:
+ case 4:
+ data = *(u32 *) val;
+ break;
+ case 2:
+ data = *(u16 *) val;
+ break;
+ case 1:
+ data = *(u8 *) val;
+ break;
+ default:
printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
return 0;
}
@@ -343,7 +352,7 @@ static int ioapic_mmio_write(struct kvm_io_device *this,
gpa_t addr, int len,
spin_lock(&ioapic->lock);
switch (addr) {
case IOAPIC_REG_SELECT:
- ioapic->ioregsel = data;
+ ioapic->ioregsel = data & 0xFF; /* 8-bit register */
break;
case IOAPIC_REG_WINDOW:
--
1.7.7.3
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
