From ae699ad348cdcd416cbf28e8a02fc468780161f7 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:20 +0000 Subject: irqchip/gic-v4.1: Move doorbell management to the GICv4 abstraction layer In order to hide some of the differences between v4.0 and v4.1, move the doorbell management out of the KVM code, and into the GICv4-specific layer. This allows the calling code to ask for the doorbell when blocking, and otherwise to leave the doorbell permanently disabled. This matches the v4.1 code perfectly, and only results in a minor refactoring of the v4.0 code. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Link: https://lore.kernel.org/r/20200304203330.4967-14-maz@kernel.org --- virt/kvm/arm/vgic/vgic-v3.c | 4 +++- virt/kvm/arm/vgic/vgic-v4.c | 34 ++++++++++++++-------------------- 2 files changed, 17 insertions(+), 21 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index f45635a6f0ec..1bc09b523486 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -595,7 +595,9 @@ int vgic_v3_probe(const struct gic_kvm_info *info) /* GICv4 support? */ if (info->has_v4) { kvm_vgic_global_state.has_gicv4 = gicv4_enable; - kvm_info("GICv4 support %sabled\n", + kvm_vgic_global_state.has_gicv4_1 = info->has_v4_1 && gicv4_enable; + kvm_info("GICv4%s support %sabled\n", + kvm_vgic_global_state.has_gicv4_1 ? ".1" : "", gicv4_enable ? "en" : "dis"); } diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c index 46f875589c47..1eb0f8c76219 100644 --- a/virt/kvm/arm/vgic/vgic-v4.c +++ b/virt/kvm/arm/vgic/vgic-v4.c @@ -67,10 +67,10 @@ * it. And if we've migrated our vcpu from one CPU to another, we must * tell the ITS (so that the messages reach the right redistributor). * This is done in two steps: first issue a irq_set_affinity() on the - * irq corresponding to the vcpu, then call its_schedule_vpe(). You - * must be in a non-preemptible context. On exit, another call to - * its_schedule_vpe() tells the redistributor that we're done with the - * vcpu. + * irq corresponding to the vcpu, then call its_make_vpe_resident(). + * You must be in a non-preemptible context. On exit, a call to + * its_make_vpe_non_resident() tells the redistributor that we're done + * with the vcpu. * * Finally, the doorbell handling: Each vcpu is allocated an interrupt * which will fire each time a VLPI is made pending whilst the vcpu is @@ -86,7 +86,8 @@ static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info) struct kvm_vcpu *vcpu = info; /* We got the message, no need to fire again */ - if (!irqd_irq_disabled(&irq_to_desc(irq)->irq_data)) + if (!kvm_vgic_global_state.has_gicv4_1 && + !irqd_irq_disabled(&irq_to_desc(irq)->irq_data)) disable_irq_nosync(irq); vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last = true; @@ -199,19 +200,11 @@ void vgic_v4_teardown(struct kvm *kvm) int vgic_v4_put(struct kvm_vcpu *vcpu, bool need_db) { struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; - struct irq_desc *desc = irq_to_desc(vpe->irq); if (!vgic_supports_direct_msis(vcpu->kvm) || !vpe->resident) return 0; - /* - * If blocking, a doorbell is required. Undo the nested - * disable_irq() calls... - */ - while (need_db && irqd_irq_disabled(&desc->irq_data)) - enable_irq(vpe->irq); - - return its_schedule_vpe(vpe, false); + return its_make_vpe_non_resident(vpe, need_db); } int vgic_v4_load(struct kvm_vcpu *vcpu) @@ -232,18 +225,19 @@ int vgic_v4_load(struct kvm_vcpu *vcpu) if (err) return err; - /* Disabled the doorbell, as we're about to enter the guest */ - disable_irq_nosync(vpe->irq); - - err = its_schedule_vpe(vpe, true); + err = its_make_vpe_resident(vpe, false, vcpu->kvm->arch.vgic.enabled); if (err) return err; /* * Now that the VPE is resident, let's get rid of a potential - * doorbell interrupt that would still be pending. + * doorbell interrupt that would still be pending. This is a + * GICv4.0 only "feature"... */ - return irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false); + if (!kvm_vgic_global_state.has_gicv4_1) + err = irq_set_irqchip_state(vpe->irq, IRQCHIP_STATE_PENDING, false); + + return err; } static struct vgic_its *vgic_get_its(struct kvm *kvm, -- cgit v1.2.3 From 9879b79aefe5ca3cfee0138189c8116f3a71e770 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:24 +0000 Subject: KVM: arm64: GICv4.1: Let doorbells be auto-enabled As GICv4.1 understands the life cycle of doorbells (instead of just randomly firing them at the most inconvenient time), just enable them at irq_request time, and be done with it. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Reviewed-by: Eric Auger Link: https://lore.kernel.org/r/20200304203330.4967-18-maz@kernel.org --- virt/kvm/arm/vgic/vgic-v4.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c index 1eb0f8c76219..c2fcde104ea2 100644 --- a/virt/kvm/arm/vgic/vgic-v4.c +++ b/virt/kvm/arm/vgic/vgic-v4.c @@ -141,6 +141,7 @@ int vgic_v4_init(struct kvm *kvm) kvm_for_each_vcpu(i, vcpu, kvm) { int irq = dist->its_vm.vpes[i]->irq; + unsigned long irq_flags = DB_IRQ_FLAGS; /* * Don't automatically enable the doorbell, as we're @@ -148,8 +149,14 @@ int vgic_v4_init(struct kvm *kvm) * blocked. Also disable the lazy disabling, as the * doorbell could kick us out of the guest too * early... + * + * On GICv4.1, the doorbell is managed in HW and must + * be left enabled. */ - irq_set_status_flags(irq, DB_IRQ_FLAGS); + if (kvm_vgic_global_state.has_gicv4_1) + irq_flags &= ~IRQ_NOAUTOEN; + irq_set_status_flags(irq, irq_flags); + ret = request_irq(irq, vgic_v4_doorbell_handler, 0, "vcpu", vcpu); if (ret) { -- cgit v1.2.3 From ef1820be47773012d7526abb8c79befcc1d7b607 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:25 +0000 Subject: KVM: arm64: GICv4.1: Add direct injection capability to SGI registers Most of the GICv3 emulation code that deals with SGIs now has to be aware of the v4.1 capabilities in order to benefit from it. Add such support, keyed on the interrupt having the hw flag set and being a SGI. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Reviewed-by: Eric Auger Link: https://lore.kernel.org/r/20200304203330.4967-19-maz@kernel.org --- virt/kvm/arm/vgic/vgic-mmio-v3.c | 27 ++++++++++-- virt/kvm/arm/vgic/vgic-mmio.c | 88 +++++++++++++++++++++++++++++++++++++--- 2 files changed, 107 insertions(+), 8 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index ebc218840fc2..f4da9d1a6bff 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include @@ -257,8 +258,18 @@ static unsigned long vgic_v3_uaccess_read_pending(struct kvm_vcpu *vcpu, */ for (i = 0; i < len * 8; i++) { struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + bool state = irq->pending_latch; - if (irq->pending_latch) + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + int err; + + err = irq_get_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + &state); + WARN_ON(err); + } + + if (state) value |= (1U << i); vgic_put_irq(vcpu->kvm, irq); @@ -942,8 +953,18 @@ void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg, bool allow_group1) * generate interrupts of either group. */ if (!irq->group || allow_group1) { - irq->pending_latch = true; - vgic_queue_irq_unlock(vcpu->kvm, irq, flags); + if (!irq->hw) { + irq->pending_latch = true; + vgic_queue_irq_unlock(vcpu->kvm, irq, flags); + } else { + /* HW SGI? Ask the GIC to inject it */ + int err; + err = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + true); + WARN_RATELIMIT(err, "IRQ %d", irq->host_irq); + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + } } else { raw_spin_unlock_irqrestore(&irq->irq_lock, flags); } diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 97fb2a40e6ba..2199302597fa 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -5,6 +5,8 @@ #include #include +#include +#include #include #include #include @@ -59,6 +61,11 @@ unsigned long vgic_mmio_read_group(struct kvm_vcpu *vcpu, return value; } +static void vgic_update_vsgi(struct vgic_irq *irq) +{ + WARN_ON(its_prop_update_vsgi(irq->host_irq, irq->priority, irq->group)); +} + void vgic_mmio_write_group(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len, unsigned long val) { @@ -71,7 +78,12 @@ void vgic_mmio_write_group(struct kvm_vcpu *vcpu, gpa_t addr, raw_spin_lock_irqsave(&irq->irq_lock, flags); irq->group = !!(val & BIT(i)); - vgic_queue_irq_unlock(vcpu->kvm, irq, flags); + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + vgic_update_vsgi(irq); + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + } else { + vgic_queue_irq_unlock(vcpu->kvm, irq, flags); + } vgic_put_irq(vcpu->kvm, irq); } @@ -113,7 +125,21 @@ void vgic_mmio_write_senable(struct kvm_vcpu *vcpu, struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); raw_spin_lock_irqsave(&irq->irq_lock, flags); - if (vgic_irq_is_mapped_level(irq)) { + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + if (!irq->enabled) { + struct irq_data *data; + + irq->enabled = true; + data = &irq_to_desc(irq->host_irq)->irq_data; + while (irqd_irq_disabled(data)) + enable_irq(irq->host_irq); + } + + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + vgic_put_irq(vcpu->kvm, irq); + + continue; + } else if (vgic_irq_is_mapped_level(irq)) { bool was_high = irq->line_level; /* @@ -148,6 +174,8 @@ void vgic_mmio_write_cenable(struct kvm_vcpu *vcpu, struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); raw_spin_lock_irqsave(&irq->irq_lock, flags); + if (irq->hw && vgic_irq_is_sgi(irq->intid) && irq->enabled) + disable_irq_nosync(irq->host_irq); irq->enabled = false; @@ -167,10 +195,22 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu, for (i = 0; i < len * 8; i++) { struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); unsigned long flags; + bool val; raw_spin_lock_irqsave(&irq->irq_lock, flags); - if (irq_is_pending(irq)) - value |= (1U << i); + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + int err; + + val = false; + err = irq_get_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + &val); + WARN_RATELIMIT(err, "IRQ %d", irq->host_irq); + } else { + val = irq_is_pending(irq); + } + + value |= ((u32)val << i); raw_spin_unlock_irqrestore(&irq->irq_lock, flags); vgic_put_irq(vcpu->kvm, irq); @@ -215,6 +255,21 @@ void vgic_mmio_write_spending(struct kvm_vcpu *vcpu, } raw_spin_lock_irqsave(&irq->irq_lock, flags); + + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + /* HW SGI? Ask the GIC to inject it */ + int err; + err = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + true); + WARN_RATELIMIT(err, "IRQ %d", irq->host_irq); + + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + vgic_put_irq(vcpu->kvm, irq); + + continue; + } + if (irq->hw) vgic_hw_irq_spending(vcpu, irq, is_uaccess); else @@ -269,6 +324,20 @@ void vgic_mmio_write_cpending(struct kvm_vcpu *vcpu, raw_spin_lock_irqsave(&irq->irq_lock, flags); + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + /* HW SGI? Ask the GIC to clear its pending bit */ + int err; + err = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + false); + WARN_RATELIMIT(err, "IRQ %d", irq->host_irq); + + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + vgic_put_irq(vcpu->kvm, irq); + + continue; + } + if (irq->hw) vgic_hw_irq_cpending(vcpu, irq, is_uaccess); else @@ -318,8 +387,15 @@ static void vgic_mmio_change_active(struct kvm_vcpu *vcpu, struct vgic_irq *irq, raw_spin_lock_irqsave(&irq->irq_lock, flags); - if (irq->hw) { + if (irq->hw && !vgic_irq_is_sgi(irq->intid)) { vgic_hw_irq_change_active(vcpu, irq, active, !requester_vcpu); + } else if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + /* + * GICv4.1 VSGI feature doesn't track an active state, + * so let's not kid ourselves, there is nothing we can + * do here. + */ + irq->active = false; } else { u32 model = vcpu->kvm->arch.vgic.vgic_model; u8 active_source; @@ -493,6 +569,8 @@ void vgic_mmio_write_priority(struct kvm_vcpu *vcpu, raw_spin_lock_irqsave(&irq->irq_lock, flags); /* Narrow the priority range to what we actually support */ irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS); + if (irq->hw && vgic_irq_is_sgi(irq->intid)) + vgic_update_vsgi(irq); raw_spin_unlock_irqrestore(&irq->irq_lock, flags); vgic_put_irq(vcpu->kvm, irq); -- cgit v1.2.3 From bacf2c60548befa8a31c2f19ef65bf2177fda33f Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:26 +0000 Subject: KVM: arm64: GICv4.1: Allow SGIs to switch between HW and SW interrupts In order to let a guest buy in the new, active-less SGIs, we need to be able to switch between the two modes. Handle this by stopping all guest activity, transfer the state from one mode to the other, and resume the guest. Nothing calls this code so far, but a later patch will plug it into the MMIO emulation. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Link: https://lore.kernel.org/r/20200304203330.4967-20-maz@kernel.org --- include/kvm/arm_vgic.h | 3 ++ virt/kvm/arm/vgic/vgic-v4.c | 98 +++++++++++++++++++++++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 1 + 3 files changed, 102 insertions(+) (limited to 'virt') diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 63457908c9c4..69f4164d6477 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -231,6 +231,9 @@ struct vgic_dist { /* distributor enabled */ bool enabled; + /* Wants SGIs without active state */ + bool nassgireq; + struct vgic_irq *spis; struct vgic_io_device dist_iodev; diff --git a/virt/kvm/arm/vgic/vgic-v4.c b/virt/kvm/arm/vgic/vgic-v4.c index c2fcde104ea2..27ac833e5ec7 100644 --- a/virt/kvm/arm/vgic/vgic-v4.c +++ b/virt/kvm/arm/vgic/vgic-v4.c @@ -97,6 +97,104 @@ static irqreturn_t vgic_v4_doorbell_handler(int irq, void *info) return IRQ_HANDLED; } +static void vgic_v4_sync_sgi_config(struct its_vpe *vpe, struct vgic_irq *irq) +{ + vpe->sgi_config[irq->intid].enabled = irq->enabled; + vpe->sgi_config[irq->intid].group = irq->group; + vpe->sgi_config[irq->intid].priority = irq->priority; +} + +static void vgic_v4_enable_vsgis(struct kvm_vcpu *vcpu) +{ + struct its_vpe *vpe = &vcpu->arch.vgic_cpu.vgic_v3.its_vpe; + int i; + + /* + * With GICv4.1, every virtual SGI can be directly injected. So + * let's pretend that they are HW interrupts, tied to a host + * IRQ. The SGI code will do its magic. + */ + for (i = 0; i < VGIC_NR_SGIS; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i); + struct irq_desc *desc; + unsigned long flags; + int ret; + + raw_spin_lock_irqsave(&irq->irq_lock, flags); + + if (irq->hw) + goto unlock; + + irq->hw = true; + irq->host_irq = irq_find_mapping(vpe->sgi_domain, i); + + /* Transfer the full irq state to the vPE */ + vgic_v4_sync_sgi_config(vpe, irq); + desc = irq_to_desc(irq->host_irq); + ret = irq_domain_activate_irq(irq_desc_get_irq_data(desc), + false); + if (!WARN_ON(ret)) { + /* Transfer pending state */ + ret = irq_set_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + irq->pending_latch); + WARN_ON(ret); + irq->pending_latch = false; + } + unlock: + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + vgic_put_irq(vcpu->kvm, irq); + } +} + +static void vgic_v4_disable_vsgis(struct kvm_vcpu *vcpu) +{ + int i; + + for (i = 0; i < VGIC_NR_SGIS; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, i); + struct irq_desc *desc; + unsigned long flags; + int ret; + + raw_spin_lock_irqsave(&irq->irq_lock, flags); + + if (!irq->hw) + goto unlock; + + irq->hw = false; + ret = irq_get_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + &irq->pending_latch); + WARN_ON(ret); + + desc = irq_to_desc(irq->host_irq); + irq_domain_deactivate_irq(irq_desc_get_irq_data(desc)); + unlock: + raw_spin_unlock_irqrestore(&irq->irq_lock, flags); + vgic_put_irq(vcpu->kvm, irq); + } +} + +/* Must be called with the kvm lock held */ +void vgic_v4_configure_vsgis(struct kvm *kvm) +{ + struct vgic_dist *dist = &kvm->arch.vgic; + struct kvm_vcpu *vcpu; + int i; + + kvm_arm_halt_guest(kvm); + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (dist->nassgireq) + vgic_v4_enable_vsgis(vcpu); + else + vgic_v4_disable_vsgis(vcpu); + } + + kvm_arm_resume_guest(kvm); +} + /** * vgic_v4_init - Initialize the GICv4 data structures * @kvm: Pointer to the VM being initialized diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index c7fefd6b1c80..769e4802645e 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -316,5 +316,6 @@ void vgic_its_invalidate_cache(struct kvm *kvm); bool vgic_supports_direct_msis(struct kvm *kvm); int vgic_v4_init(struct kvm *kvm); void vgic_v4_teardown(struct kvm *kvm); +void vgic_v4_configure_vsgis(struct kvm *kvm); #endif -- cgit v1.2.3 From 2291ff2f2a569b7b7a64aff3d05e1d51fe0fd66a Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:27 +0000 Subject: KVM: arm64: GICv4.1: Plumb SGI implementation selection in the distributor The GICv4.1 architecture gives the hypervisor the option to let the guest choose whether it wants the good old SGIs with an active state, or the new, HW-based ones that do not have one. For this, plumb the configuration of SGIs into the GICv3 MMIO handling, present the GICD_TYPER2.nASSGIcap to the guest, and handle the GICD_CTLR.nASSGIreq setting. In order to be able to deal with the restore of a guest, also apply the GICD_CTLR.nASSGIreq setting at first run so that we can move the restored SGIs to the HW if that's what the guest had selected in a previous life. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Link: https://lore.kernel.org/r/20200304203330.4967-21-maz@kernel.org --- virt/kvm/arm/vgic/vgic-mmio-v3.c | 49 ++++++++++++++++++++++++++++++++++++++-- virt/kvm/arm/vgic/vgic-v3.c | 2 ++ 2 files changed, 49 insertions(+), 2 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index f4da9d1a6bff..905032a03886 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -3,6 +3,7 @@ * VGICv3 MMIO handling functions */ +#include #include #include #include @@ -70,6 +71,8 @@ static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu, if (vgic->enabled) value |= GICD_CTLR_ENABLE_SS_G1; value |= GICD_CTLR_ARE_NS | GICD_CTLR_DS; + if (vgic->nassgireq) + value |= GICD_CTLR_nASSGIreq; break; case GICD_TYPER: value = vgic->nr_spis + VGIC_NR_PRIVATE_IRQS; @@ -81,6 +84,10 @@ static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu, value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19; } break; + case GICD_TYPER2: + if (kvm_vgic_global_state.has_gicv4_1) + value = GICD_TYPER2_nASSGIcap; + break; case GICD_IIDR: value = (PRODUCT_ID_KVM << GICD_IIDR_PRODUCT_ID_SHIFT) | (vgic->implementation_rev << GICD_IIDR_REVISION_SHIFT) | @@ -98,17 +105,43 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, unsigned long val) { struct vgic_dist *dist = &vcpu->kvm->arch.vgic; - bool was_enabled = dist->enabled; switch (addr & 0x0c) { - case GICD_CTLR: + case GICD_CTLR: { + bool was_enabled, is_hwsgi; + + mutex_lock(&vcpu->kvm->lock); + + was_enabled = dist->enabled; + is_hwsgi = dist->nassgireq; + dist->enabled = val & GICD_CTLR_ENABLE_SS_G1; + /* Not a GICv4.1? No HW SGIs */ + if (!kvm_vgic_global_state.has_gicv4_1) + val &= ~GICD_CTLR_nASSGIreq; + + /* Dist stays enabled? nASSGIreq is RO */ + if (was_enabled && dist->enabled) { + val &= ~GICD_CTLR_nASSGIreq; + val |= FIELD_PREP(GICD_CTLR_nASSGIreq, is_hwsgi); + } + + /* Switching HW SGIs? */ + dist->nassgireq = val & GICD_CTLR_nASSGIreq; + if (is_hwsgi != dist->nassgireq) + vgic_v4_configure_vsgis(vcpu->kvm); + if (!was_enabled && dist->enabled) vgic_kick_vcpus(vcpu->kvm); + + mutex_unlock(&vcpu->kvm->lock); break; + } case GICD_TYPER: + case GICD_TYPER2: case GICD_IIDR: + /* This is at best for documentation purposes... */ return; } } @@ -117,10 +150,22 @@ static int vgic_mmio_uaccess_write_v3_misc(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len, unsigned long val) { + struct vgic_dist *dist = &vcpu->kvm->arch.vgic; + switch (addr & 0x0c) { + case GICD_TYPER2: case GICD_IIDR: if (val != vgic_mmio_read_v3_misc(vcpu, addr, len)) return -EINVAL; + return 0; + case GICD_CTLR: + /* Not a GICv4.1? No HW SGIs */ + if (!kvm_vgic_global_state.has_gicv4_1) + val &= ~GICD_CTLR_nASSGIreq; + + dist->enabled = val & GICD_CTLR_ENABLE_SS_G1; + dist->nassgireq = val & GICD_CTLR_nASSGIreq; + return 0; } vgic_mmio_write_v3_misc(vcpu, addr, len, val); diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 1bc09b523486..2c9fc13e2c59 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -540,6 +540,8 @@ int vgic_v3_map_resources(struct kvm *kvm) goto out; } + if (kvm_vgic_global_state.has_gicv4_1) + vgic_v4_configure_vsgis(kvm); dist->ready = true; out: -- cgit v1.2.3 From d9c3872cd2f86b7295446e35b4801270669d2960 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:28 +0000 Subject: KVM: arm64: GICv4.1: Reload VLPI configuration on distributor enable/disable Each time a Group-enable bit gets flipped, the state of these bits needs to be forwarded to the hardware. This is a pretty heavy handed operation, requiring all vcpus to reload their GICv4 configuration. It is thus implemented as a new request type. These enable bits are programmed into the HW by setting the VGrp{0,1}En fields of GICR_VPENDBASER when the vPEs are made resident again. Of course, we only support Group-1 for now... Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Link: https://lore.kernel.org/r/20200304203330.4967-22-maz@kernel.org --- arch/arm/include/asm/kvm_host.h | 1 + arch/arm64/include/asm/kvm_host.h | 1 + virt/kvm/arm/arm.c | 8 ++++++++ virt/kvm/arm/vgic/vgic-mmio-v3.c | 5 ++++- 4 files changed, 14 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index a827b4d60d38..3da57e863df6 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -39,6 +39,7 @@ #define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1) #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2) #define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3) +#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4) DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use); diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 57fd46acd058..32c8a675e5a4 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -44,6 +44,7 @@ #define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1) #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(2) #define KVM_REQ_RECORD_STEAL KVM_ARCH_REQ(3) +#define KVM_REQ_RELOAD_GICv4 KVM_ARCH_REQ(4) DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use); diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index eda7b624eab8..4d864f857ac8 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -625,6 +625,14 @@ static void check_vcpu_requests(struct kvm_vcpu *vcpu) if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu)) kvm_update_stolen_time(vcpu); + + if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) { + /* The distributor enable bits were changed */ + preempt_disable(); + vgic_v4_put(vcpu, false); + vgic_v4_load(vcpu); + preempt_enable(); + } } } diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index 905032a03886..e72dcc454247 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -132,7 +132,10 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, if (is_hwsgi != dist->nassgireq) vgic_v4_configure_vsgis(vcpu->kvm); - if (!was_enabled && dist->enabled) + if (kvm_vgic_global_state.has_gicv4_1 && + was_enabled != dist->enabled) + kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_RELOAD_GICv4); + else if (!was_enabled && dist->enabled) vgic_kick_vcpus(vcpu->kvm); mutex_unlock(&vcpu->kvm->lock); -- cgit v1.2.3 From dab4fe3bf6dd87a7d6dbab2c929afd1ef62a120b Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 4 Mar 2020 20:33:30 +0000 Subject: KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs The vgic-state debugfs file could do with showing the pending state of the HW-backed SGIs. Plug it into the low-level code. Signed-off-by: Marc Zyngier Reviewed-by: Zenghui Yu Reviewed-by: Eric Auger Link: https://lore.kernel.org/r/20200304203330.4967-24-maz@kernel.org --- virt/kvm/arm/vgic/vgic-debug.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-debug.c b/virt/kvm/arm/vgic/vgic-debug.c index cc12fe9b2df3..b13a9e3f99dd 100644 --- a/virt/kvm/arm/vgic/vgic-debug.c +++ b/virt/kvm/arm/vgic/vgic-debug.c @@ -178,6 +178,8 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq, struct kvm_vcpu *vcpu) { char *type; + bool pending; + if (irq->intid < VGIC_NR_SGIS) type = "SGI"; else if (irq->intid < VGIC_NR_PRIVATE_IRQS) @@ -190,6 +192,16 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq, if (irq->intid ==0 || irq->intid == VGIC_NR_PRIVATE_IRQS) print_header(s, irq, vcpu); + pending = irq->pending_latch; + if (irq->hw && vgic_irq_is_sgi(irq->intid)) { + int err; + + err = irq_get_irqchip_state(irq->host_irq, + IRQCHIP_STATE_PENDING, + &pending); + WARN_ON_ONCE(err); + } + seq_printf(s, " %s %4d " " %2d " "%d%d%d%d%d%d%d " @@ -201,7 +213,7 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq, "\n", type, irq->intid, (irq->target_vcpu) ? irq->target_vcpu->vcpu_id : -1, - irq->pending_latch, + pending, irq->line_level, irq->active, irq->enabled, -- cgit v1.2.3