On Tue, Jul 21, 2009 at 06:57:42PM +0300, Michael S. Tsirkin wrote:
> reserve gsi 0 to 23 so that they won't be allocated for msi
>
In the not so distant future we may want to support more then one
ioapic, so 23 will became 23*n where n is a number of ioapics. I prefer
to fix it by moving msi injection to its own ioctl. But for now may be
we can scan used_gsi_bitmap from the end during allocation of gsi for
msi?
> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
>
> ---
>
> diff --git a/qemu-kvm.c b/qemu-kvm.c
> index c6c9fc6..f440b2d 100644
> --- a/qemu-kvm.c
> +++ b/qemu-kvm.c
> @@ -1613,10 +1613,12 @@ int kvm_get_irq_route_gsi(kvm_context_t kvm)
> {
> int i, bit;
> uint32_t *buf = kvm->used_gsi_bitmap;
> + uint32_t mask = 0xff000000;
>
> /* Return the lowest unused GSI in the bitmap */
> - for (i = 0; i < kvm->max_gsi / 32; i++) {
> - bit = ffs(~buf[i]);
> + for (i = 0; i < kvm->max_gsi / 32; i++) {
> + bit = ffs(~buf[i] & mask);
> + mask = 0xffffffff;
> if (!bit)
> continue;
>
--
Gleb.
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