From: Michael Ellerman Date: Wed, 17 Oct 2018 12:39:41 +0000 (+1100) Subject: powerpc/time: Fix clockevent_decrementer initalisation for PR KVM X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cd3cac5198777cabf5ab6a8226148431e42a0ddf;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git powerpc/time: Fix clockevent_decrementer initalisation for PR KVM [ Upstream commit b4d16ab58c41ff0125822464bdff074cebd0fe47 ] 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 Signed-off-by: Sasha Levin --- diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 870e75d30459..7c7c5a16284d 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -988,6 +988,10 @@ static void register_decrementer_clockevent(int cpu) printk_once(KERN_DEBUG "clockevent: %s mult[%x] shift[%d] cpu[%d]\n", dec->name, dec->mult, dec->shift, cpu); + + /* Set values for KVM, see kvm_emulate_dec() */ + decrementer_clockevent.mult = dec->mult; + decrementer_clockevent.shift = dec->shift; } static void enable_large_decrementer(void)