From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Ellerman <patch-notifications@ellerman.id.au>
Date: Mon, 22 Oct 2018 09:40:10 +0000
Subject: Re: powerpc/time: Fix clockevent_decrementer initalisation for PR KVM
Message-Id: <42ds233ZW4z9sDC@ozlabs.org>
List-Id: <kvm-ppc.vger.kernel.org>
In-Reply-To: <20181019042319.9457-1-mpe@ellerman.id.au>
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To: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@ozlabs.org
Cc: paulus@samba.org, anton@samba.org, kvm-ppc@vger.kernel.org

On Fri, 2018-10-19 at 04:23:19 UTC, Michael Ellerman wrote:
> In the recent commit 8b78fdb045de ("powerpc/time: Use
> clockevents_register_device(), fixing an issue with large
> decrementer") we changed the way we initialise the decrementer
> clockevent(s).
> 
> We no longer initialise the mult & shift values of
> decrementer_clockevent itself.
> 
> This has the effect of breaking PR KVM, because it uses those values
> in kvmppc_emulate_dec(). The symptom is guest kernels spin forever
> mid-way through boot.
> 
> For now fix it by assigning back to decrementer_clockevent the mult
> and shift values.
> 
> Fixes: 8b78fdb045de ("powerpc/time: Use clockevents_register_device(), fixing an issue with large decrementer")
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> Acked-by: Anton Blanchard <anton@samba.org>

Applied to powerpc next.

https://git.kernel.org/powerpc/c/b4d16ab58c41ff0125822464bdff07

cheers