From: Suraj Jitindar Singh sjitindarsingh@gmail.com
commit 3c25ab35fbc8526ac0c9b298e8a78e7ad7a55479 upstream.
If we enter an L1 guest with a pending decrementer exception then this is cleared on guest exit if the guest has writtien a positive value into the decrementer (indicating that it handled the decrementer exception) since there is no other way to detect that the guest has handled the pending exception and that it should be dequeued. In the event that the L1 guest tries to run a nested (L2) guest immediately after this and the L2 guest decrementer is negative (which is loaded by L1 before making the H_ENTER_NESTED hcall), then the pending decrementer exception isn't cleared and the L2 entry is blocked since L1 has a pending exception, even though L1 may have already handled the exception and written a positive value for it's decrementer. This results in a loop of L1 trying to enter the L2 guest and L0 blocking the entry since L1 has an interrupt pending with the outcome being that L2 never gets to run and hangs.
Fix this by clearing any pending decrementer exceptions when L1 makes the H_ENTER_NESTED hcall since it won't do this if it's decrementer has gone negative, and anyway it's decrementer has been communicated to L0 in the hdec_expires field and L0 will return control to L1 when this goes negative by delivering an H_DECREMENTER exception.
Fixes: 95a6432ce903 ("KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests") Cc: stable@vger.kernel.org # v4.20+ Signed-off-by: Suraj Jitindar Singh sjitindarsingh@gmail.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kvm/book3s_hv.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
--- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4084,8 +4084,15 @@ int kvmhv_run_single_vcpu(struct kvm_run
preempt_enable();
- /* cancel pending decrementer exception if DEC is now positive */ - if (get_tb() < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu)) + /* + * cancel pending decrementer exception if DEC is now positive, or if + * entering a nested guest in which case the decrementer is now owned + * by L2 and the L1 decrementer is provided in hdec_expires + */ + if (kvmppc_core_pending_dec(vcpu) && + ((get_tb() < vcpu->arch.dec_expires) || + (trap == BOOK3S_INTERRUPT_SYSCALL && + kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) kvmppc_core_dequeue_dec(vcpu);
trace_kvm_guest_exit(vcpu);