There is a bug in the APIC V09 patch when porting Xen
find_highest_vector to find_highest_bit,
here is the prototype fix. (Not tested)
diff --git a/drivers/kvm/lapic.c b/drivers/kvm/lapic.c
index 602e94c..64264a0 100644
--- a/drivers/kvm/lapic.c
+++ b/drivers/kvm/lapic.c
@@ -62,12 +62,21 @@ struct kvm_kern_apic {
void *regs;
};
+static int find_highest_vector(void *bitmap)
+{
+ u32 *word = bitmap;
+ int word_offset = MAX_APIC_VECTOR / 32;
+
+ /* Work backwards through the bitmap (first 32-bit word in every
four). */
+ while ( (word_offset != 0) && (word[(--word_offset)*4] == 0) )
+ continue;
+
+ return (fls(word[word_offset*4]) - 1) + (word_offset * 32);
+}
+
static __inline__ int find_highest_bit(unsigned long *data, int
nr_bits)
{
- int length = BITS_TO_LONGS(nr_bits);
- while (length && !data[--length])
- continue;
- return __ffs(data[length]) + (length * BITS_PER_LONG);
+ return find_highest_vector(data);
}
#define APIC_LVT_NUM 6
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