Re: [Qemu-devel] [PATCH v1 5/6] kvm: kvm_log_start/stop are only called with known sections

[Thomas Huth <thuth@redhat.com>]

On 11.09.2017 19:49, David Hildenbrand wrote:
> Let's properly align the sections first and bail out if we would ever
> get called with a memory section we don't know yet.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  accel/kvm/kvm-all.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index b677d1b13e..2ae459453d 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -411,15 +411,21 @@ static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem,
>  static int kvm_section_update_flags(KVMMemoryListener *kml,
>                                      MemoryRegionSection *section)
>  {
> -    hwaddr phys_addr = section->offset_within_address_space;
> -    ram_addr_t size = int128_get64(section->size);
> -    KVMSlot *mem = kvm_lookup_matching_slot(kml, phys_addr, size);
> +    hwaddr start_addr, size;
> +    KVMSlot *mem;
>  
> -    if (mem == NULL)  {
> +    size = kvm_align_section(section, &start_addr);
> +    if (!size) {
>          return 0;
> -    } else {
> -        return kvm_slot_update_flags(kml, mem, section->mr);
>      }
> +
> +    mem = kvm_lookup_matching_slot(kml, start_addr, size);
> +    if (!mem) {
> +        fprintf(stderr, "%s: error finding slot\n", __func__);
> +        abort();
> +    }

FYI, this abort now triggers with the "isa-vga" device:

$ x86_64-softmmu/qemu-system-x86_64 -S -accel kvm -device isa-vga
kvm_section_update_flags: error finding slot
Aborted (core dumped)

Any ideas how to fix this?

 Thomas