From 5955c7469a73033f607ebd6d418058943fe13dd3 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Tue, 23 Nov 2021 19:51:41 +1000 Subject: [PATCH] KMV: PPC: Book3S HV P9: Use set_dec to set decrementer to host The host Linux timer code arms the decrementer with the value 'decrementers_next_tb - current_tb' using set_dec(), which stores val - 1 on Book3S-64, which is not quite the same as what KVM does to re-arm the host decrementer when exiting the guest. This shouldn't be a significant change, but it makes the logic match and avoids this small extra change being brought into the next patch. Suggested-by: Alexey Kardashevskiy Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211123095231.1036501-4-npiggin@gmail.com --- arch/powerpc/kvm/book3s_hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 2777f66001a8..c7dbdec183b9 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4063,7 +4063,7 @@ static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, vc->entry_exit_map = 0x101; vc->in_guest = 0; - mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb()); + set_dec(local_paca->kvm_hstate.dec_expires - mftb()); /* We may have raced with new irq work */ if (test_irq_work_pending()) set_dec(1);