From 01f0876efc26cfc597a2b357830a81cbf9dcdf7b Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Fri, 1 Dec 2023 18:56:11 +0530 Subject: [PATCH] KVM: PPC: Book3S HV: Handle pending exceptions on guest entry with MSR_EE [ Upstream commit ecd10702baae5c16a91d139bde7eff84ce55daee ] Commit 026728dc5d41 ("KVM: PPC: Book3S HV P9: Inject pending xive interrupts at guest entry") changed guest entry so that if external interrupts are enabled, BOOK3S_IRQPRIO_EXTERNAL is not tested for. Test for this regardless of MSR_EE. For an L1 host, do not inject an interrupt, but always use LPCR_MER. If the L0 desires it can inject an interrupt. Fixes: 026728dc5d41 ("KVM: PPC: Book3S HV P9: Inject pending xive interrupts at guest entry") Signed-off-by: Nicholas Piggin [jpn: use kvmpcc_get_msr(), write commit message] Signed-off-by: Jordan Niethe Signed-off-by: Michael Ellerman Link: https://msgid.link/20231201132618.555031-7-vaibhav@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/kvm/book3s_hv.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 11bc5aaea01fc..0429488ba170d 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4663,13 +4663,19 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, if (!nested) { kvmppc_core_prepare_to_enter(vcpu); - if (__kvmppc_get_msr_hv(vcpu) & MSR_EE) { - if (xive_interrupt_pending(vcpu)) + if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, + &vcpu->arch.pending_exceptions) || + xive_interrupt_pending(vcpu)) { + /* + * For nested HV, don't synthesize but always pass MER, + * the L0 will be able to optimise that more + * effectively than manipulating registers directly. + */ + if (!kvmhv_on_pseries() && (__kvmppc_get_msr_hv(vcpu) & MSR_EE)) kvmppc_inject_interrupt_hv(vcpu, - BOOK3S_INTERRUPT_EXTERNAL, 0); - } else if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, - &vcpu->arch.pending_exceptions)) { - lpcr |= LPCR_MER; + BOOK3S_INTERRUPT_EXTERNAL, 0); + else + lpcr |= LPCR_MER; } } else if (vcpu->arch.pending_exceptions || vcpu->arch.doorbell_request ||