On Fri, 6 Jun 2014 14:46:05 +0200
Alexander Graf <agraf@xxxxxxx> wrote:
> KVM tells us the number of GSIs it can handle inside the kernel. That value is
> basically KVM_MAX_IRQ_ROUTES. However when we try to set the GSI mapping table,
> it checks for
>
> r = -EINVAL;
> if (routing.nr >= KVM_MAX_IRQ_ROUTES)
> goto out;
>
> erroring out even when we're only using all of the GSIs. To make sure we never
> hit that limit, let's reduce the number of GSIs we get from KVM by one.
>
> Signed-off-by: Alexander Graf <agraf@xxxxxxx>
> ---
> kvm-all.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kvm-all.c b/kvm-all.c
> index 4e19eff..56a251b 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -938,7 +938,7 @@ void kvm_init_irq_routing(KVMState *s)
> {
> int gsi_count, i;
>
> - gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING);
> + gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1;
> if (gsi_count > 0) {
> unsigned int gsi_bits, i;
>
But gsi_count is already marked as used further down in this function,
isn't it? Confused.
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