From 8d4ba9c931bc384bcc6889a43915aaaf19d3e499 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Tue, 13 Aug 2019 20:01:00 +1000 Subject: [PATCH] KVM: PPC: Book3S HV: Don't push XIVE context when not using XIVE device MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit At present, when running a guest on POWER9 using HV KVM but not using an in-kernel interrupt controller (XICS or XIVE), for example if QEMU is run with the kernel_irqchip=off option, the guest entry code goes ahead and tries to load the guest context into the XIVE hardware, even though no context has been set up. To fix this, we check that the "CAM word" is non-zero before pushing it to the hardware. The CAM word is initialized to a non-zero value in kvmppc_xive_connect_vcpu() and kvmppc_xive_native_connect_vcpu(), and is now cleared in kvmppc_xive_{,native_}cleanup_vcpu. Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller") Cc: stable@vger.kernel.org # v4.12+ Reported-by: Cédric Le Goater Signed-off-by: Paul Mackerras Reviewed-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190813100100.GC9567@blackberry --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 2 ++ arch/powerpc/kvm/book3s_xive.c | 11 ++++++++++- arch/powerpc/kvm/book3s_xive_native.c | 3 +++ 3 files changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 2e7e788eb0cf..07181d0dfcb7 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -942,6 +942,8 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300) ld r11, VCPU_XIVE_SAVED_STATE(r4) li r9, TM_QW1_OS lwz r8, VCPU_XIVE_CAM_WORD(r4) + cmpwi r8, 0 + beq no_xive li r7, TM_QW1_OS + TM_WORD2 mfmsr r0 andi. r0, r0, MSR_DR /* in real mode? */ diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 09f838aa3138..586867e46e51 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -67,8 +67,14 @@ void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) void __iomem *tima = local_paca->kvm_hstate.xive_tima_virt; u64 pq; - if (!tima) + /* + * Nothing to do if the platform doesn't have a XIVE + * or this vCPU doesn't have its own XIVE context + * (e.g. because it's not using an in-kernel interrupt controller). + */ + if (!tima || !vcpu->arch.xive_cam_word) return; + eieio(); __raw_writeq(vcpu->arch.xive_saved_state.w01, tima + TM_QW1_OS); __raw_writel(vcpu->arch.xive_cam_word, tima + TM_QW1_OS + TM_WORD2); @@ -1146,6 +1152,9 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) /* Disable the VP */ xive_native_disable_vp(xc->vp_id); + /* Clear the cam word so guest entry won't try to push context */ + vcpu->arch.xive_cam_word = 0; + /* Free the queues */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { struct xive_q *q = &xc->queues[i]; diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c index 368427fcad20..11b91b46fc39 100644 --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -81,6 +81,9 @@ void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) /* Disable the VP */ xive_native_disable_vp(xc->vp_id); + /* Clear the cam word so guest entry won't try to push context */ + vcpu->arch.xive_cam_word = 0; + /* Free the queues */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { kvmppc_xive_native_cleanup_queue(vcpu, i); -- 2.30.2