Re: [Qemu-devel] [RFC PATCH v0 2/2] spapr: Abort when HTAB of requested size isn't allocated

[David Gibson <david@gibson.dropbear.id.au>]

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On Tue, Sep 22, 2015 at 09:09:49AM +0530, Bharata B Rao wrote:
> Terminate the guest when HTAB of requested size isn't allocated by
> the host.
> 
> When memory hotplug is attempted on a guest that has booted with
> less than requested HTAB size, the guest kernel will not be able
> to gracefully fail the hotplug request. This patch will ensure that
> we never end up in a situation where memory hotplug fails due to
> less than requested HTAB size.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/ppc/spapr.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 4692122..66446af 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -992,6 +992,10 @@ static void spapr_alloc_htab(sPAPRMachineState *spapr)
>  
>      if (shift > 0) {
>          /* Kernel handles htab, we don't need to allocate one */
> +        if (shift != spapr->htab_shift) {
> +            error_setg(&error_abort, "Failed to allocated requested HTAB size");
> +        }
> +
>          spapr->htab_shift = shift;
>          kvmppc_kern_htab = true;
>  

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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