From: Alexandru Elisei <alexandru.elisei@arm.com> To: Marc Zyngier <marc.zyngier@arm.com>, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Andre Przywara <andre.przywara@arm.com>, Dave Martin <Dave.Martin@arm.com> Subject: Re: [PATCH 53/59] KVM: arm64: nv: Implement maintenance interrupt forwarding Date: Tue, 16 Jul 2019 17:35:18 +0100 [thread overview] Message-ID: <432dedcf-620e-4de1-3d22-9527665276b2@arm.com> (raw) In-Reply-To: <20190621093843.220980-54-marc.zyngier@arm.com> On 6/21/19 10:38 AM, Marc Zyngier wrote: > When we take a maintenance interrupt, we need to decide whether > it is generated on an action from the guest, or if it is something > that needs to be forwarded to the guest hypervisor. > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> > --- > arch/arm64/kvm/nested.c | 2 +- > virt/kvm/arm/vgic/vgic-init.c | 30 ++++++++++++++++++++++++++++++ > virt/kvm/arm/vgic/vgic-v3-nested.c | 25 +++++++++++++++++++++---- > 3 files changed, 52 insertions(+), 5 deletions(-) > > diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c > index df2db9ab7cfb..ab61f0f30ee6 100644 > --- a/arch/arm64/kvm/nested.c > +++ b/arch/arm64/kvm/nested.c > @@ -545,7 +545,7 @@ bool vgic_state_is_nested(struct kvm_vcpu *vcpu) > bool imo = __vcpu_sys_reg(vcpu, HCR_EL2) & HCR_IMO; > bool fmo = __vcpu_sys_reg(vcpu, HCR_EL2) & HCR_FMO; > > - WARN(imo != fmo, "Separate virtual IRQ/FIQ settings not supported\n"); > + WARN_ONCE(imo != fmo, "Separate virtual IRQ/FIQ settings not supported\n"); > > return nested_virt_in_use(vcpu) && imo && fmo && !is_hyp_ctxt(vcpu); > } > diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c > index 3bdb31eaed64..ec54bc8d5126 100644 > --- a/virt/kvm/arm/vgic/vgic-init.c > +++ b/virt/kvm/arm/vgic/vgic-init.c > @@ -17,9 +17,11 @@ > #include <linux/uaccess.h> > #include <linux/interrupt.h> > #include <linux/cpu.h> > +#include <linux/irq.h> > #include <linux/kvm_host.h> > #include <kvm/arm_vgic.h> > #include <asm/kvm_mmu.h> > +#include <asm/kvm_nested.h> > #include "vgic.h" > > /* > @@ -240,6 +242,16 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu) > if (!irqchip_in_kernel(vcpu->kvm)) > return 0; > > + if (nested_virt_in_use(vcpu)) { > + /* FIXME: remove this hack */ > + if (vcpu->kvm->arch.vgic.maint_irq == 0) > + vcpu->kvm->arch.vgic.maint_irq = kvm_vgic_global_state.maint_irq; > + ret = kvm_vgic_set_owner(vcpu, vcpu->kvm->arch.vgic.maint_irq, > + vcpu); > + if (ret) > + return ret; > + } > + > /* > * If we are creating a VCPU with a GICv3 we must also register the > * KVM io device for the redistributor that belongs to this VCPU. > @@ -455,12 +467,23 @@ static int vgic_init_cpu_dying(unsigned int cpu) > > static irqreturn_t vgic_maintenance_handler(int irq, void *data) > { > + struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)data; > + > /* > * We cannot rely on the vgic maintenance interrupt to be > * delivered synchronously. This means we can only use it to > * exit the VM, and we perform the handling of EOIed > * interrupts on the exit path (see vgic_fold_lr_state). > */ > + > + /* If not nested, deactivate */ > + if (!vcpu || !vgic_state_is_nested(vcpu)) { > + irq_set_irqchip_state(irq, IRQCHIP_STATE_ACTIVE, false); > + return IRQ_HANDLED; > + } > + > + /* Assume nested from now */ > + vgic_v3_handle_nested_maint_irq(vcpu); > return IRQ_HANDLED; > } > > @@ -531,6 +554,13 @@ int kvm_vgic_hyp_init(void) > return ret; > } > > + ret = irq_set_vcpu_affinity(kvm_vgic_global_state.maint_irq, > + kvm_get_running_vcpus()); > + if (ret) { > + kvm_err("Error setting vcpu affinity\n"); > + goto out_free_irq; > + } > + > ret = cpuhp_setup_state(CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING, > "kvm/arm/vgic:starting", > vgic_init_cpu_starting, vgic_init_cpu_dying); > diff --git a/virt/kvm/arm/vgic/vgic-v3-nested.c b/virt/kvm/arm/vgic/vgic-v3-nested.c > index c917d49e4a14..7c5f82ae68e0 100644 > --- a/virt/kvm/arm/vgic/vgic-v3-nested.c > +++ b/virt/kvm/arm/vgic/vgic-v3-nested.c > @@ -172,10 +172,20 @@ void vgic_v3_sync_nested(struct kvm_vcpu *vcpu) > void vgic_v3_load_nested(struct kvm_vcpu *vcpu) > { > struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu; > + struct vgic_irq *irq; > + unsigned long flags; > > vgic_cpu->shadow_vgic_v3 = vgic_cpu->nested_vgic_v3; > vgic_v3_create_shadow_lr(vcpu); > __vgic_v3_restore_state(vcpu_shadow_if(vcpu)); > + > + irq = vgic_get_irq(vcpu->kvm, vcpu, vcpu->kvm->arch.vgic.maint_irq); > + raw_spin_lock_irqsave(&irq->irq_lock, flags); > + if (irq->line_level || irq->active) > + irq_set_irqchip_state(kvm_vgic_global_state.maint_irq, > + IRQCHIP_STATE_ACTIVE, true); > + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); > + vgic_put_irq(vcpu->kvm, irq); > } > > void vgic_v3_put_nested(struct kvm_vcpu *vcpu) > @@ -190,11 +200,14 @@ void vgic_v3_put_nested(struct kvm_vcpu *vcpu) > */ > vgic_v3_fixup_shadow_lr_state(vcpu); > vgic_cpu->nested_vgic_v3 = vgic_cpu->shadow_vgic_v3; > + irq_set_irqchip_state(kvm_vgic_global_state.maint_irq, > + IRQCHIP_STATE_ACTIVE, false); > } > > void vgic_v3_handle_nested_maint_irq(struct kvm_vcpu *vcpu) > { > struct vgic_v3_cpu_if *cpu_if = vcpu_nested_if(vcpu); > + bool state; > > /* > * If we exit a nested VM with a pending maintenance interrupt from the > @@ -202,8 +215,12 @@ void vgic_v3_handle_nested_maint_irq(struct kvm_vcpu *vcpu) > * can re-sync the appropriate LRs and sample level triggered interrupts > * again. > */ > - if (vgic_state_is_nested(vcpu) && > - (cpu_if->vgic_hcr & ICH_HCR_EN) && > - vgic_v3_get_misr(vcpu)) > - kvm_inject_nested_irq(vcpu); > + if (!vgic_state_is_nested(vcpu)) > + return; Isn't this redundant with the same check in vgic_maintenance_handler? Thanks, Alex > + > + state = cpu_if->vgic_hcr & ICH_HCR_EN; > + state &= vgic_v3_get_misr(vcpu); > + > + kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id, > + vcpu->kvm->arch.vgic.maint_irq, state, vcpu); > } _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
next prev parent reply other threads:[~2019-07-16 16:35 UTC|newest] Thread overview: 179+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-21 9:37 [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support Marc Zyngier 2019-06-21 9:37 ` [PATCH 01/59] KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Marc Zyngier 2019-06-24 11:16 ` Dave Martin 2019-06-24 12:59 ` Alexandru Elisei 2019-07-03 12:32 ` Marc Zyngier 2019-06-21 9:37 ` [PATCH 02/59] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Marc Zyngier 2019-06-24 11:19 ` Dave Martin 2019-07-03 9:30 ` Marc Zyngier 2019-07-03 16:13 ` Dave Martin 2019-06-21 9:37 ` [PATCH 03/59] arm64: Add ARM64_HAS_NESTED_VIRT cpufeature Marc Zyngier 2019-06-21 13:08 ` Julien Thierry 2019-06-21 13:22 ` Marc Zyngier 2019-06-21 13:44 ` Suzuki K Poulose 2019-06-24 11:24 ` Dave Martin 2019-06-21 9:37 ` [PATCH 04/59] KVM: arm64: nv: Introduce nested virtualization VCPU feature Marc Zyngier 2019-06-21 13:08 ` Julien Thierry 2019-06-24 11:28 ` Dave Martin 2019-07-03 11:53 ` Marc Zyngier 2019-07-03 16:27 ` Dave Martin 2019-06-24 11:43 ` Dave Martin 2019-07-03 11:56 ` Marc Zyngier 2019-07-03 16:24 ` Dave Martin 2019-06-21 9:37 ` [PATCH 05/59] KVM: arm64: nv: Reset VCPU to EL2 registers if VCPU nested virt is set Marc Zyngier 2019-06-24 10:19 ` Suzuki K Poulose 2019-06-24 11:38 ` Dave Martin 2019-06-21 9:37 ` [PATCH 06/59] KVM: arm64: nv: Allow userspace to set PSR_MODE_EL2x Marc Zyngier 2019-06-21 13:24 ` Julien Thierry 2019-06-21 13:50 ` Marc Zyngier 2019-06-24 12:48 ` Dave Martin 2019-07-03 9:21 ` Marc Zyngier 2019-07-04 10:00 ` Dave Martin 2019-06-21 9:37 ` [PATCH 07/59] KVM: arm64: nv: Add EL2 system registers to vcpu context Marc Zyngier 2019-06-24 12:54 ` Dave Martin 2019-07-03 12:20 ` Marc Zyngier 2019-07-03 16:31 ` Dave Martin 2019-06-24 15:47 ` Alexandru Elisei 2019-07-03 13:20 ` Marc Zyngier 2019-07-03 16:01 ` Marc Zyngier 2019-07-01 16:36 ` Suzuki K Poulose 2019-06-21 9:37 ` [PATCH 08/59] KVM: arm64: nv: Reset VMPIDR_EL2 and VPIDR_EL2 to sane values Marc Zyngier 2019-06-24 12:59 ` Dave Martin 2019-06-21 9:37 ` [PATCH 09/59] KVM: arm64: nv: Add nested virt VCPU primitives for vEL2 VCPU state Marc Zyngier 2019-06-24 13:08 ` Dave Martin 2019-06-21 9:37 ` [PATCH 10/59] KVM: arm64: nv: Support virtual EL2 exceptions Marc Zyngier 2019-07-08 13:56 ` Steven Price 2019-06-21 9:37 ` [PATCH 11/59] KVM: arm64: nv: Inject HVC exceptions to the virtual EL2 Marc Zyngier 2019-06-25 13:13 ` Alexandru Elisei 2019-07-03 14:16 ` Marc Zyngier 2019-07-30 14:08 ` Alexandru Elisei 2019-06-21 9:37 ` [PATCH 12/59] KVM: arm64: nv: Handle trapped ERET from " Marc Zyngier 2019-07-02 12:00 ` Alexandru Elisei 2019-06-21 9:37 ` [PATCH 13/59] KVM: arm64: nv: Handle virtual EL2 registers in vcpu_read/write_sys_reg() Marc Zyngier 2019-06-24 12:42 ` Julien Thierry 2019-06-25 14:02 ` Alexandru Elisei 2019-07-03 12:15 ` Marc Zyngier 2019-07-03 15:21 ` Julien Thierry 2019-06-25 15:18 ` Alexandru Elisei 2019-07-01 9:58 ` Alexandru Elisei 2019-07-03 15:59 ` Marc Zyngier 2019-07-03 16:32 ` Alexandru Elisei 2019-07-04 14:39 ` Marc Zyngier 2019-06-26 15:04 ` Alexandru Elisei 2019-07-04 15:05 ` Marc Zyngier 2019-07-01 12:10 ` Alexandru Elisei 2019-06-21 9:37 ` [PATCH 14/59] KVM: arm64: nv: Handle SPSR_EL2 specially Marc Zyngier 2019-06-21 9:37 ` [PATCH 15/59] KVM: arm64: nv: Refactor vcpu_{read,write}_sys_reg Marc Zyngier 2019-06-24 15:07 ` Julien Thierry 2019-07-03 13:09 ` Marc Zyngier 2019-06-27 9:21 ` Alexandru Elisei 2019-07-04 15:15 ` Marc Zyngier 2019-06-21 9:38 ` [PATCH 16/59] KVM: arm64: nv: Save/Restore vEL2 sysregs Marc Zyngier 2019-06-25 8:48 ` Julien Thierry 2019-07-03 13:42 ` Marc Zyngier 2019-07-01 12:09 ` Alexandru Elisei 2019-08-21 11:57 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 17/59] KVM: arm64: nv: Emulate PSTATE.M for a guest hypervisor Marc Zyngier 2019-06-21 9:38 ` [PATCH 18/59] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2 Marc Zyngier 2019-07-01 16:12 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 19/59] KVM: arm64: nv: Trap SPSR_EL1, ELR_EL1 and VBAR_EL1 from " Marc Zyngier 2019-06-21 9:38 ` [PATCH 20/59] KVM: arm64: nv: Trap CPACR_EL1 access in " Marc Zyngier 2019-07-01 16:40 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 21/59] KVM: arm64: nv: Set a handler for the system instruction traps Marc Zyngier 2019-06-25 12:55 ` Julien Thierry 2019-07-03 14:15 ` Marc Zyngier 2019-06-21 9:38 ` [PATCH 22/59] KVM: arm64: nv: Handle PSCI call via smc from the guest Marc Zyngier 2019-06-21 9:38 ` [PATCH 23/59] KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting Marc Zyngier 2019-06-25 14:19 ` Julien Thierry 2019-07-02 12:54 ` Alexandru Elisei 2019-07-03 14:18 ` Marc Zyngier 2019-06-21 9:38 ` [PATCH 24/59] KVM: arm64: nv: Respect virtual CPTR_EL2.TFP setting Marc Zyngier 2019-06-21 9:38 ` [PATCH 25/59] KVM: arm64: nv: Don't expose SVE to nested guests Marc Zyngier 2019-06-21 9:38 ` [PATCH 26/59] KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting Marc Zyngier 2019-06-26 5:31 ` Julien Thierry 2019-07-03 16:31 ` Marc Zyngier 2019-06-21 9:38 ` [PATCH 27/59] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings Marc Zyngier 2019-06-26 6:55 ` Julien Thierry 2019-07-04 14:57 ` Marc Zyngier 2019-06-21 9:38 ` [PATCH 28/59] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting Marc Zyngier 2019-06-26 7:23 ` Julien Thierry 2019-07-02 16:32 ` Alexandru Elisei 2019-07-03 9:10 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 29/59] KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2 Marc Zyngier 2019-07-03 9:16 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 30/59] KVM: arm64: nv: Configure HCR_EL2 for nested virtualization Marc Zyngier 2019-06-21 9:38 ` [PATCH 31/59] KVM: arm64: nv: Only toggle cache for virtual EL2 when SCTLR_EL2 changes Marc Zyngier 2019-06-21 9:38 ` [PATCH 32/59] KVM: arm64: nv: Hide RAS from nested guests Marc Zyngier 2019-07-03 13:59 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 33/59] KVM: arm64: nv: Pretend we only support larger-than-host page sizes Marc Zyngier 2019-07-03 14:13 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 34/59] KVM: arm/arm64: nv: Factor out stage 2 page table data from struct kvm Marc Zyngier 2019-07-03 15:52 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 35/59] KVM: arm/arm64: nv: Support multiple nested stage 2 mmu structures Marc Zyngier 2019-06-25 12:19 ` Alexandru Elisei 2019-07-03 13:47 ` Marc Zyngier 2019-06-27 13:15 ` Julien Thierry 2019-07-04 15:51 ` Alexandru Elisei 2020-01-05 11:35 ` Marc Zyngier 2020-01-06 16:31 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 36/59] KVM: arm64: nv: Implement nested Stage-2 page table walk logic Marc Zyngier 2019-06-21 9:38 ` [PATCH 37/59] KVM: arm64: nv: Handle shadow stage 2 page faults Marc Zyngier 2019-07-05 14:28 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 38/59] KVM: arm64: nv: Unmap/flush shadow stage 2 page tables Marc Zyngier 2019-07-01 8:03 ` Julien Thierry 2019-06-21 9:38 ` [PATCH 39/59] KVM: arm64: nv: Move last_vcpu_ran to be per s2 mmu Marc Zyngier 2019-07-01 9:10 ` Julien Thierry 2019-07-05 15:28 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 40/59] KVM: arm64: nv: Don't always start an S2 MMU search from the beginning Marc Zyngier 2019-07-09 9:59 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 41/59] KVM: arm64: nv: Introduce sys_reg_desc.forward_trap Marc Zyngier 2019-06-21 9:38 ` [PATCH 42/59] KVM: arm64: nv: Rework the system instruction emulation framework Marc Zyngier 2019-06-21 9:38 ` [PATCH 43/59] KVM: arm64: nv: Trap and emulate AT instructions from virtual EL2 Marc Zyngier 2019-07-01 15:45 ` Julien Thierry 2019-07-09 13:20 ` Alexandru Elisei 2019-07-18 12:13 ` Tomasz Nowicki 2019-07-18 12:36 ` Alexandru Elisei 2019-07-18 12:56 ` Alexandru Elisei 2019-07-18 12:59 ` Tomasz Nowicki 2019-07-24 10:25 ` Tomasz Nowicki 2019-07-24 12:39 ` Marc Zyngier 2019-07-24 13:56 ` Tomasz Nowicki 2019-06-21 9:38 ` [PATCH 44/59] KVM: arm64: nv: Trap and emulate TLBI " Marc Zyngier 2019-07-02 12:37 ` Julien Thierry 2019-07-10 10:15 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 45/59] KVM: arm64: nv: Handle traps for timer _EL02 and _EL2 sysregs accessors Marc Zyngier 2019-06-21 9:38 ` [PATCH 46/59] KVM: arm64: nv: arch_timer: Support hyp timer emulation Marc Zyngier 2019-07-10 16:23 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 47/59] KVM: arm64: nv: Propagate CNTVOFF_EL2 to the virtual EL1 timer Marc Zyngier 2019-08-08 9:34 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 48/59] KVM: arm64: nv: Load timer before the GIC Marc Zyngier 2019-07-11 13:17 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 49/59] KVM: arm64: nv: vgic-v3: Take cpu_if pointer directly instead of vcpu Marc Zyngier 2019-06-21 9:38 ` [PATCH 50/59] KVM: arm64: nv: Nested GICv3 Support Marc Zyngier 2019-07-16 11:41 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 51/59] KVM: arm64: nv: vgic: Emulate the HW bit in software Marc Zyngier 2019-06-21 9:38 ` [PATCH 52/59] KVM: arm64: nv: vgic: Allow userland to set VGIC maintenance IRQ Marc Zyngier 2019-07-04 7:38 ` Julien Thierry 2019-07-04 9:01 ` Andre Przywara 2019-07-04 9:04 ` Julien Thierry 2019-06-21 9:38 ` [PATCH 53/59] KVM: arm64: nv: Implement maintenance interrupt forwarding Marc Zyngier 2019-07-04 8:06 ` Julien Thierry 2019-07-16 16:35 ` Alexandru Elisei [this message] 2019-06-21 9:38 ` [PATCH 54/59] KVM: arm64: nv: Add nested GICv3 tracepoints Marc Zyngier 2019-06-21 9:38 ` [PATCH 55/59] arm64: KVM: nv: Add handling of EL2-specific timer registers Marc Zyngier 2019-07-11 12:35 ` Alexandru Elisei 2019-07-17 10:19 ` Alexandru Elisei 2019-06-21 9:38 ` [PATCH 56/59] arm64: KVM: nv: Honor SCTLR_EL2.SPAN on entering vEL2 Marc Zyngier 2019-06-21 9:38 ` [PATCH 57/59] arm64: KVM: nv: Handle SCTLR_EL2 RES0/RES1 bits Marc Zyngier 2019-06-21 9:38 ` [PATCH 58/59] arm64: KVM: nv: Restrict S2 RD/WR permissions to match the guest's Marc Zyngier 2019-06-21 9:38 ` [PATCH 59/59] arm64: KVM: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT Marc Zyngier 2019-06-21 9:57 ` [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support Itaru Kitayama 2019-06-21 11:21 ` Marc Zyngier 2019-08-02 10:11 ` Alexandru Elisei 2019-08-02 10:30 ` Andrew Jones 2019-08-09 10:01 ` Alexandru Elisei 2019-08-09 11:44 ` Andrew Jones 2019-08-09 12:00 ` Alexandru Elisei 2019-08-09 13:00 ` Andrew Jones 2019-08-22 11:57 ` Alexandru Elisei 2019-08-22 15:32 ` Alexandru Elisei
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