Re: [Qemu-devel] [PATCH 1/1] s390x/sclp: fix maxram calculation

[Cornelia Huck <cohuck@redhat.com>]

On Mon, 30 Jul 2018 16:09:26 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> We clamp down ram_size to match the sclp increment size. We do
> not do the same for maxram_size, which means for large guests
> with some sizes (e.g. -m 50000) maxram_size differs from ram_size.
> This can break other code (e.g. CMMA migration) which uses maxram_size
> to calculate the number of pages and then throws some errors.
> 
> Fixes: 82fab5c5b90e468f3e9d54c ("s390x/sclp: remove memory hotplug support")
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> CC: qemu-stable@nongnu.org
> CC: David Hildenbrand <david@redhat.com>
> ---
>  hw/s390x/sclp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
> index bd2a024..4510a80 100644
> --- a/hw/s390x/sclp.c
> +++ b/hw/s390x/sclp.c
> @@ -320,6 +320,7 @@ static void sclp_memory_init(SCLPDevice *sclp)
>      initial_mem = initial_mem >> increment_size << increment_size;
>  
>      machine->ram_size = initial_mem;
> +    machine->maxram_size = initial_mem;
>      /* let's propagate the changed ram size into the global variable. */
>      ram_size = initial_mem;
>  }

Thanks, queued to s390-fixes.