From 44de9d683847ba6dbac290bb8c9f1b773cbda746 Mon Sep 17 00:00:00 2001 From: Eric Auger Date: Thu, 4 May 2017 11:19:52 +0200 Subject: KVM: arm64: vgic-v3: vgic_v3_lpi_sync_pending_status this new helper synchronizes the irq pending_latch with the LPI pending bit status found in rdist pending table. As the status is consumed, we reset the bit in pending table. As we need the PENDBASER_ADDRESS() in vgic-v3, let's move its definition in the irqchip header. We restore the full length of the field, ie [51:16]. Same for PROPBASER_ADDRESS with full field length of [51:12]. Signed-off-by: Eric Auger Reviewed-by: Marc Zyngier Reviewed-by: Christoffer Dall --- virt/kvm/arm/vgic/vgic-its.c | 6 ++---- virt/kvm/arm/vgic/vgic-v3.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ virt/kvm/arm/vgic/vgic.h | 1 + 3 files changed, 47 insertions(+), 4 deletions(-) (limited to 'virt') diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index bd1362e9c214..3601790d841e 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -221,8 +221,6 @@ static struct its_ite *find_ite(struct vgic_its *its, u32 device_id, */ #define BASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 16)) #define CBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12)) -#define PENDBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 16)) -#define PROPBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12)) #define GIC_LPI_OFFSET 8192 @@ -257,7 +255,7 @@ static struct its_collection *find_collection(struct vgic_its *its, int coll_id) static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq, struct kvm_vcpu *filter_vcpu) { - u64 propbase = PROPBASER_ADDRESS(kvm->arch.vgic.propbaser); + u64 propbase = GICR_PROPBASER_ADDRESS(kvm->arch.vgic.propbaser); u8 prop; int ret; @@ -369,7 +367,7 @@ static u32 max_lpis_propbaser(u64 propbaser) */ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu) { - gpa_t pendbase = PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser); + gpa_t pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser); struct vgic_irq *irq; int last_byte_offset = -1; int ret = 0; diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index df1503650300..9ae8adddff69 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -234,6 +234,50 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu) vgic_v3->vgic_hcr = ICH_HCR_EN; } +int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq) +{ + struct kvm_vcpu *vcpu; + int byte_offset, bit_nr; + gpa_t pendbase, ptr; + bool status; + u8 val; + int ret; + +retry: + vcpu = irq->target_vcpu; + if (!vcpu) + return 0; + + pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser); + + byte_offset = irq->intid / BITS_PER_BYTE; + bit_nr = irq->intid % BITS_PER_BYTE; + ptr = pendbase + byte_offset; + + ret = kvm_read_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + + status = val & (1 << bit_nr); + + spin_lock(&irq->irq_lock); + if (irq->target_vcpu != vcpu) { + spin_unlock(&irq->irq_lock); + goto retry; + } + irq->pending_latch = status; + vgic_queue_irq_unlock(vcpu->kvm, irq); + + if (status) { + /* clear consumed data */ + val &= ~(1 << bit_nr); + ret = kvm_write_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + } + return 0; +} + /* check for overlapping regions and for regions crossing the end of memory */ static bool vgic_v3_check_base(struct kvm *kvm) { diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index a48f33b04b2d..79768c801863 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -149,6 +149,7 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); void vgic_v3_enable(struct kvm_vcpu *vcpu); int vgic_v3_probe(const struct gic_kvm_info *info); int vgic_v3_map_resources(struct kvm *kvm); +int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq); int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address); void vgic_v3_load(struct kvm_vcpu *vcpu); -- cgit v1.2.3