Re: [PATCH] kvm: set gsi_bits and max_gsi correctly

[Alex Williamson <alex.williamson@redhat.com>]

On Wed, 2012-03-28 at 14:18 -0400, Jason Baron wrote:
> The current kvm_init_irq_routing() doesn't set up the used_gsi_bitmap
> correctly, and as a consequence pins max_gsi to 32 when it really
> should be 1024. I ran into this limitation while testing pci
> passthrough, where I consistently got an -ENOSPC return from
> kvm_get_irq_route_gsi() called from assigned_dev_update_msix_mmio().
> 
> Signed-off-by: Jason Baron <jbaron@redhat.com>
> ---
>  kvm-all.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kvm-all.c b/kvm-all.c
> index ab88c7c..b616c7d 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -873,7 +873,7 @@ static void kvm_init_irq_routing(KVMState *s)
>          unsigned int gsi_bits, i;
>  
>          /* Round up so we can search ints using ffs */
> -        gsi_bits = (gsi_count + 31) / 32;
> +        gsi_bits = ALIGN(gsi_count, 32);
>          s->used_gsi_bitmap = g_malloc0(gsi_bits / 8);
>          s->max_gsi = gsi_bits;
>  

Acked-by: Alex Williamson <alex.williamson@redhat.com>