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KVM: PPC: Book3S HV P9: Clear vcpu cpu fields before enabling host irqs

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On guest entry, vcpu->cpu and vcpu->arch.thread_cpu are set after
disabling host irqs. On guest exit there is a window whre tick time
accounting briefly enables irqs before these fields are cleared.

Move them up to ensure they are cleared before host irqs are run.
This is possibly not a problem, but is more symmetric and makes the
fields less surprising.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220908132545.4085849-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-09-08 23:25:41 +10:00 committed by Michael Ellerman
parent 0a5bfb824a
commit bc91c04bff
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kvm/book3s_hv.c
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@ -4629,6 +4629,9 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
set_irq_happened(trap);
vcpu->cpu = -1;
vcpu->arch.thread_cpu = -1;
context_tracking_guest_exit();
if (!vtime_accounting_enabled_this_cpu()) {
local_irq_enable();
@ -4644,9 +4647,6 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit,
}
vtime_account_guest_exit();
vcpu->cpu = -1;
vcpu->arch.thread_cpu = -1;
powerpc_local_irq_pmu_restore(flags);
preempt_enable();