Re: [Qemu-devel] [PATCH] target/ppc: fix CPU hotplug when radix is enabled (TCG)

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

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On Fri, Jul 14, 2017 at 06:13:58PM +0200, Cédric Le Goater wrote:
> But when a guest initializes radix mode, it issues a H_REGISTER_PROC_TBL
> to update the LPCR of all CPUs. Hot-plugged CPUs inherit from the same
> setting under KVM but not under TCG. So, Let's check for radix and update
> the default LPCR to keep new CPUs in sync.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-2.10, thanks.

> ---
>  target/ppc/translate_init.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> index 8b9807665dd5..8776e9b0f8fa 100644
> --- a/target/ppc/translate_init.c
> +++ b/target/ppc/translate_init.c
> @@ -9014,8 +9014,16 @@ void cpu_ppc_set_papr(PowerPCCPU *cpu, PPCVirtualHypervisor *vhyp)
>          /* By default we choose legacy mode and switch to new hash or radix
>           * when a register process table hcall is made. So disable process
>           * tables and guest translation shootdown by default
> +         *
> +         * Hot-plugged CPUs inherit from the guest radix setting under
> +         * KVM but not under TCG. Update the default LPCR to keep new
> +         * CPUs in sync when radix is enabled.
>           */
> -        lpcr->default_value &= ~(LPCR_UPRT | LPCR_GTSE);
> +        if (ppc64_radix_guest(cpu)) {
> +            lpcr->default_value |= LPCR_UPRT | LPCR_GTSE;
> +        } else {
> +            lpcr->default_value &= ~(LPCR_UPRT | LPCR_GTSE);
> +        }
>          lpcr->default_value |= LPCR_PDEE | LPCR_HDEE | LPCR_EEE | LPCR_DEE |
>                                 LPCR_OEE;
>          break;

-- 
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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