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KMV: PPC: Book3S HV P9: Use set_dec to set decrementer to host

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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 <aik@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211123095231.1036501-4-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-11-23 19:51:41 +10:00 committed by Michael Ellerman
parent 736df58fd5
commit 5955c7469a
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kvm/book3s_hv.c
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@ -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);