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Re: [PATCH] spapr: propagate LPCR to hot-plugged CPUs
From: |
Greg Kurz |
Subject: |
Re: [PATCH] spapr: propagate LPCR to hot-plugged CPUs |
Date: |
Tue, 25 May 2021 17:12:34 +0200 |
On Mon, 24 May 2021 13:41:32 +0200
Cédric Le Goater <clg@kaod.org> wrote:
> Distros have started using the 'scv' instructions (glibc 2.33) which
> relies on the LPCR AIL bits. Unfortunately, the LPCR of hot-plugged
> CPUs is not synchronized with the rest of machine and it breaks the
> guest OS.
>
> Fix that by using the first CPU to set the LPCR value of all hot-plugged
> CPUs.
>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
LGTM
Reviewed-by: Greg Kurz <groug@kaod.org>
> hw/ppc/spapr.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index c23bcc449071..e463c2570c7a 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -3890,6 +3890,8 @@ static void spapr_core_plug(HotplugHandler
> *hotplug_dev, DeviceState *dev)
> for (i = 0; i < cc->nr_threads; i++) {
> ppc_set_compat(core->threads[i],
> POWERPC_CPU(first_cpu)->compat_pvr,
> &error_abort);
> + ppc_store_lpcr(core->threads[i],
> + POWERPC_CPU(first_cpu)->env.spr[SPR_LPCR]);
> }
> }
>