[07/10] RISC-V: KVM: Add in-kernel emulation of AIA APLIC

Message ID	20230517105135.1871868-8-apatel@ventanamicro.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <kvm-owner@vger.kernel.org> From: Anup Patel <apatel@ventanamicro.com> To: Paolo Bonzini <pbonzini@redhat.com>, Atish Patra <atishp@atishpatra.org> Cc: Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, Andrew Jones <ajones@ventanamicro.com>, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel <apatel@ventanamicro.com> Subject: [PATCH 07/10] RISC-V: KVM: Add in-kernel emulation of AIA APLIC Date: Wed, 17 May 2023 16:21:32 +0530 Message-Id: <20230517105135.1871868-8-apatel@ventanamicro.com> In-Reply-To: <20230517105135.1871868-1-apatel@ventanamicro.com> References: <20230517105135.1871868-1-apatel@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	RISC-V KVM in-kernel AIA irqchip \| expand [00/10] RISC-V KVM in-kernel AIA irqchip [01/10] RISC-V: KVM: Implement guest external interrupt line management [02/10] RISC-V: KVM: Add IMSIC related defines [03/10] RISC-V: KVM: Add APLIC related defines [04/10] RISC-V: KVM: Set kvm_riscv_aia_nr_hgei to zero [05/10] RISC-V: KVM: Skeletal in-kernel AIA irqchip support [06/10] RISC-V: KVM: Implement device interface for AIA irqchip [07/10] RISC-V: KVM: Add in-kernel emulation of AIA APLIC [08/10] RISC-V: KVM: Expose APLIC registers as attributes of AIA irqchip [09/10] RISC-V: KVM: Add in-kernel virtualization of AIA IMSIC [10/10] RISC-V: KVM: Expose IMSIC registers as attributes of AIA irqchip

diff --git a/arch/riscv/include/asm/kvm_aia.h b/arch/riscv/include/asm/kvm_aia.h index a1281ebc9b92..f6bd8523395f 100644 --- a/arch/riscv/include/asm/kvm_aia.h +++ b/arch/riscv/include/asm/kvm_aia.h @@ -129,20 +129,9 @@ static inline void kvm_riscv_vcpu_aia_imsic_cleanup(struct kvm_vcpu *vcpu) { } -static inline int kvm_riscv_aia_aplic_inject(struct kvm *kvm, - u32 source, bool level) -{ - return 0; -} - -static inline int kvm_riscv_aia_aplic_init(struct kvm *kvm) -{ - return 0; -} - -static inline void kvm_riscv_aia_aplic_cleanup(struct kvm *kvm) -{ -} +int kvm_riscv_aia_aplic_inject(struct kvm *kvm, u32 source, bool level); +int kvm_riscv_aia_aplic_init(struct kvm *kvm); +void kvm_riscv_aia_aplic_cleanup(struct kvm *kvm); #ifdef CONFIG_32BIT void kvm_riscv_vcpu_aia_flush_interrupts(struct kvm_vcpu *vcpu); diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile index dd69ebe098bd..94c43702c765 100644 --- a/arch/riscv/kvm/Makefile +++ b/arch/riscv/kvm/Makefile @@ -28,3 +28,4 @@ kvm-y += vcpu_timer.o kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o kvm-y += aia.o kvm-y += aia_device.o +kvm-y += aia_aplic.o diff --git a/arch/riscv/kvm/aia_aplic.c b/arch/riscv/kvm/aia_aplic.c new file mode 100644 index 000000000000..1b0a4df64815 --- /dev/null +++ b/arch/riscv/kvm/aia_aplic.c @@ -0,0 +1,574 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + * Copyright (C) 2022 Ventana Micro Systems Inc. + * + * Authors: + * Anup Patel <apatel@ventanamicro.com> + */ + +#include <linux/kvm_host.h> +#include <linux/math.h> +#include <linux/spinlock.h> +#include <linux/swab.h> +#include <kvm/iodev.h> +#include <asm/kvm_aia_aplic.h> + +struct aplic_irq { + raw_spinlock_t lock; + u32 sourcecfg; + u32 state; +#define APLIC_IRQ_STATE_PENDING BIT(0) +#define APLIC_IRQ_STATE_ENABLED BIT(1) +#define APLIC_IRQ_STATE_ENPEND (APLIC_IRQ_STATE_PENDING | \ + APLIC_IRQ_STATE_ENABLED) +#define APLIC_IRQ_STATE_INPUT BIT(8) + u32 target; +}; + +struct aplic { + struct kvm_io_device iodev; + + u32 domaincfg; + u32 genmsi; + + u32 nr_irqs; + u32 nr_words; + struct aplic_irq *irqs; +}; + +static u32 aplic_read_sourcecfg(struct aplic *aplic, u32 irq) +{ + u32 ret; + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return 0; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + ret = irqd->sourcecfg; + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + return ret; +} + +static void aplic_write_sourcecfg(struct aplic *aplic, u32 irq, u32 val) +{ + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return; + irqd = &aplic->irqs[irq]; + + if (val & APLIC_SOURCECFG_D) + val = 0; + else + val &= APLIC_SOURCECFG_SM_MASK; + + raw_spin_lock_irqsave(&irqd->lock, flags); + irqd->sourcecfg = val; + raw_spin_unlock_irqrestore(&irqd->lock, flags); +} + +static u32 aplic_read_target(struct aplic *aplic, u32 irq) +{ + u32 ret; + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return 0; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + ret = irqd->target; + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + return ret; +} + +static void aplic_write_target(struct aplic *aplic, u32 irq, u32 val) +{ + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return; + irqd = &aplic->irqs[irq]; + + val &= APLIC_TARGET_EIID_MASK | + (APLIC_TARGET_HART_IDX_MASK << APLIC_TARGET_HART_IDX_SHIFT) | + (APLIC_TARGET_GUEST_IDX_MASK << APLIC_TARGET_GUEST_IDX_SHIFT); + + raw_spin_lock_irqsave(&irqd->lock, flags); + irqd->target = val; + raw_spin_unlock_irqrestore(&irqd->lock, flags); +} + +static bool aplic_read_pending(struct aplic *aplic, u32 irq) +{ + bool ret; + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return false; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + ret = (irqd->state & APLIC_IRQ_STATE_PENDING) ? true : false; + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + return ret; +} + +static void aplic_write_pending(struct aplic *aplic, u32 irq, bool pending) +{ + unsigned long flags, sm; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + + sm = irqd->sourcecfg & APLIC_SOURCECFG_SM_MASK; + if (!pending && + ((sm == APLIC_SOURCECFG_SM_LEVEL_HIGH) || + (sm == APLIC_SOURCECFG_SM_LEVEL_LOW))) + goto skip_write_pending; + + if (pending) + irqd->state |= APLIC_IRQ_STATE_PENDING; + else + irqd->state &= ~APLIC_IRQ_STATE_PENDING; + +skip_write_pending: + raw_spin_unlock_irqrestore(&irqd->lock, flags); +} + +static bool aplic_read_enabled(struct aplic *aplic, u32 irq) +{ + bool ret; + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return false; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + ret = (irqd->state & APLIC_IRQ_STATE_ENABLED) ? true : false; + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + return ret; +} + +static void aplic_write_enabled(struct aplic *aplic, u32 irq, bool enabled) +{ + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + if (enabled) + irqd->state |= APLIC_IRQ_STATE_ENABLED; + else + irqd->state &= ~APLIC_IRQ_STATE_ENABLED; + raw_spin_unlock_irqrestore(&irqd->lock, flags); +} + +static bool aplic_read_input(struct aplic *aplic, u32 irq) +{ + bool ret; + unsigned long flags; + struct aplic_irq *irqd; + + if (!irq || aplic->nr_irqs <= irq) + return false; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + ret = (irqd->state & APLIC_IRQ_STATE_INPUT) ? true : false; + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + return ret; +} + +static void aplic_inject_msi(struct kvm *kvm, u32 irq, u32 target) +{ + u32 hart_idx, guest_idx, eiid; + + hart_idx = target >> APLIC_TARGET_HART_IDX_SHIFT; + hart_idx &= APLIC_TARGET_HART_IDX_MASK; + guest_idx = target >> APLIC_TARGET_GUEST_IDX_SHIFT; + guest_idx &= APLIC_TARGET_GUEST_IDX_MASK; + eiid = target & APLIC_TARGET_EIID_MASK; + kvm_riscv_aia_inject_msi_by_id(kvm, hart_idx, guest_idx, eiid); +} + +static void aplic_update_irq_range(struct kvm *kvm, u32 first, u32 last) +{ + bool inject; + u32 irq, target; + unsigned long flags; + struct aplic_irq *irqd; + struct aplic *aplic = kvm->arch.aia.aplic_state; + + if (!(aplic->domaincfg & APLIC_DOMAINCFG_IE)) + return; + + for (irq = first; irq <= last; irq++) { + if (!irq || aplic->nr_irqs <= irq) + continue; + irqd = &aplic->irqs[irq]; + + raw_spin_lock_irqsave(&irqd->lock, flags); + + inject = false; + target = irqd->target; + if (irqd->state & APLIC_IRQ_STATE_ENPEND) { + irqd->state &= ~APLIC_IRQ_STATE_PENDING; + inject = true; + } + + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + if (inject) + aplic_inject_msi(kvm, irq, target); + } +} + +int kvm_riscv_aia_aplic_inject(struct kvm *kvm, u32 source, bool level) +{ + u32 target; + bool inject = false, ie; + unsigned long flags; + struct aplic_irq *irqd; + struct aplic *aplic = kvm->arch.aia.aplic_state; + + if (!aplic || !source || (aplic->nr_irqs <= source)) + return -ENODEV; + irqd = &aplic->irqs[source]; + ie = (aplic->domaincfg & APLIC_DOMAINCFG_IE) ? true : false; + + raw_spin_lock_irqsave(&irqd->lock, flags); + + if (irqd->sourcecfg & APLIC_SOURCECFG_D) + goto skip_unlock; + + switch (irqd->sourcecfg & APLIC_SOURCECFG_SM_MASK) { + case APLIC_SOURCECFG_SM_EDGE_RISE: + if (level && !(irqd->state & APLIC_IRQ_STATE_INPUT) && + !(irqd->state & APLIC_IRQ_STATE_PENDING)) + irqd->state |= APLIC_IRQ_STATE_PENDING; + break; + case APLIC_SOURCECFG_SM_EDGE_FALL: + if (!level && (irqd->state & APLIC_IRQ_STATE_INPUT) && + !(irqd->state & APLIC_IRQ_STATE_PENDING)) + irqd->state |= APLIC_IRQ_STATE_PENDING; + break; + case APLIC_SOURCECFG_SM_LEVEL_HIGH: + if (level && !(irqd->state & APLIC_IRQ_STATE_PENDING)) + irqd->state |= APLIC_IRQ_STATE_PENDING; + break; + case APLIC_SOURCECFG_SM_LEVEL_LOW: + if (!level && !(irqd->state & APLIC_IRQ_STATE_PENDING)) + irqd->state |= APLIC_IRQ_STATE_PENDING; + break; + } + + if (level) + irqd->state |= APLIC_IRQ_STATE_INPUT; + else + irqd->state &= ~APLIC_IRQ_STATE_INPUT; + + target = irqd->target; + if (ie && (irqd->state & APLIC_IRQ_STATE_ENPEND)) { + irqd->state &= ~APLIC_IRQ_STATE_PENDING; + inject = true; + } + +skip_unlock: + raw_spin_unlock_irqrestore(&irqd->lock, flags); + + if (inject) + aplic_inject_msi(kvm, source, target); + + return 0; +} + +static u32 aplic_read_input_word(struct aplic *aplic, u32 word) +{ + u32 i, ret = 0; + + for (i = 0; i < 32; i++) + ret |= aplic_read_input(aplic, word * 32 + i) ? BIT(i) : 0; + + return ret; +} + +static u32 aplic_read_pending_word(struct aplic *aplic, u32 word) +{ + u32 i, ret = 0; + + for (i = 0; i < 32; i++) + ret |= aplic_read_pending(aplic, word * 32 + i) ? BIT(i) : 0; + + return ret; +} + +static void aplic_write_pending_word(struct aplic *aplic, u32 word, + u32 val, bool pending) +{ + u32 i; + + for (i = 0; i < 32; i++) { + if (val & BIT(i)) + aplic_write_pending(aplic, word * 32 + i, pending); + } +} + +static u32 aplic_read_enabled_word(struct aplic *aplic, u32 word) +{ + u32 i, ret = 0; + + for (i = 0; i < 32; i++) + ret |= aplic_read_enabled(aplic, word * 32 + i) ? BIT(i) : 0; + + return ret; +} + +static void aplic_write_enabled_word(struct aplic *aplic, u32 word, + u32 val, bool enabled) +{ + u32 i; + + for (i = 0; i < 32; i++) { + if (val & BIT(i)) + aplic_write_enabled(aplic, word * 32 + i, enabled); + } +} + +static int aplic_mmio_read_offset(struct kvm *kvm, gpa_t off, u32 *val32) +{ + u32 i; + struct aplic *aplic = kvm->arch.aia.aplic_state; + + if ((off & 0x3) != 0) + return -EOPNOTSUPP; + + if (off == APLIC_DOMAINCFG) { + *val32 = APLIC_DOMAINCFG_RDONLY | + aplic->domaincfg | APLIC_DOMAINCFG_DM; + } else if ((off >= APLIC_SOURCECFG_BASE) && + (off < (APLIC_SOURCECFG_BASE + (aplic->nr_irqs - 1) * 4))) { + i = ((off - APLIC_SOURCECFG_BASE) >> 2) + 1; + *val32 = aplic_read_sourcecfg(aplic, i); + } else if ((off >= APLIC_SETIP_BASE) && + (off < (APLIC_SETIP_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_SETIP_BASE) >> 2; + *val32 = aplic_read_pending_word(aplic, i); + } else if (off == APLIC_SETIPNUM) { + *val32 = 0; + } else if ((off >= APLIC_CLRIP_BASE) && + (off < (APLIC_CLRIP_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_CLRIP_BASE) >> 2; + *val32 = aplic_read_input_word(aplic, i); + } else if (off == APLIC_CLRIPNUM) { + *val32 = 0; + } else if ((off >= APLIC_SETIE_BASE) && + (off < (APLIC_SETIE_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_SETIE_BASE) >> 2; + *val32 = aplic_read_enabled_word(aplic, i); + } else if (off == APLIC_SETIENUM) { + *val32 = 0; + } else if ((off >= APLIC_CLRIE_BASE) && + (off < (APLIC_CLRIE_BASE + aplic->nr_words * 4))) { + *val32 = 0; + } else if (off == APLIC_CLRIENUM) { + *val32 = 0; + } else if (off == APLIC_SETIPNUM_LE) { + *val32 = 0; + } else if (off == APLIC_SETIPNUM_BE) { + *val32 = 0; + } else if (off == APLIC_GENMSI) { + *val32 = aplic->genmsi; + } else if ((off >= APLIC_TARGET_BASE) && + (off < (APLIC_TARGET_BASE + (aplic->nr_irqs - 1) * 4))) { + i = ((off - APLIC_TARGET_BASE) >> 2) + 1; + *val32 = aplic_read_target(aplic, i); + } else + return -ENODEV; + + return 0; +} + +static int aplic_mmio_read(struct kvm_vcpu *vcpu, struct kvm_io_device *dev, + gpa_t addr, int len, void *val) +{ + if (len != 4) + return -EOPNOTSUPP; + + return aplic_mmio_read_offset(vcpu->kvm, + addr - vcpu->kvm->arch.aia.aplic_addr, + val); +} + +static int aplic_mmio_write_offset(struct kvm *kvm, gpa_t off, u32 val32) +{ + u32 i; + struct aplic *aplic = kvm->arch.aia.aplic_state; + + if ((off & 0x3) != 0) + return -EOPNOTSUPP; + + if (off == APLIC_DOMAINCFG) { + /* Only IE bit writeable */ + aplic->domaincfg = val32 & APLIC_DOMAINCFG_IE; + } else if ((off >= APLIC_SOURCECFG_BASE) && + (off < (APLIC_SOURCECFG_BASE + (aplic->nr_irqs - 1) * 4))) { + i = ((off - APLIC_SOURCECFG_BASE) >> 2) + 1; + aplic_write_sourcecfg(aplic, i, val32); + } else if ((off >= APLIC_SETIP_BASE) && + (off < (APLIC_SETIP_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_SETIP_BASE) >> 2; + aplic_write_pending_word(aplic, i, val32, true); + } else if (off == APLIC_SETIPNUM) { + aplic_write_pending(aplic, val32, true); + } else if ((off >= APLIC_CLRIP_BASE) && + (off < (APLIC_CLRIP_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_CLRIP_BASE) >> 2; + aplic_write_pending_word(aplic, i, val32, false); + } else if (off == APLIC_CLRIPNUM) { + aplic_write_pending(aplic, val32, false); + } else if ((off >= APLIC_SETIE_BASE) && + (off < (APLIC_SETIE_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_SETIE_BASE) >> 2; + aplic_write_enabled_word(aplic, i, val32, true); + } else if (off == APLIC_SETIENUM) { + aplic_write_enabled(aplic, val32, true); + } else if ((off >= APLIC_CLRIE_BASE) && + (off < (APLIC_CLRIE_BASE + aplic->nr_words * 4))) { + i = (off - APLIC_CLRIE_BASE) >> 2; + aplic_write_enabled_word(aplic, i, val32, false); + } else if (off == APLIC_CLRIENUM) { + aplic_write_enabled(aplic, val32, false); + } else if (off == APLIC_SETIPNUM_LE) { + aplic_write_pending(aplic, val32, true); + } else if (off == APLIC_SETIPNUM_BE) { + aplic_write_pending(aplic, __swab32(val32), true); + } else if (off == APLIC_GENMSI) { + aplic->genmsi = val32 & ~(APLIC_TARGET_GUEST_IDX_MASK << + APLIC_TARGET_GUEST_IDX_SHIFT); + kvm_riscv_aia_inject_msi_by_id(kvm, + val32 >> APLIC_TARGET_HART_IDX_SHIFT, 0, + val32 & APLIC_TARGET_EIID_MASK); + } else if ((off >= APLIC_TARGET_BASE) && + (off < (APLIC_TARGET_BASE + (aplic->nr_irqs - 1) * 4))) { + i = ((off - APLIC_TARGET_BASE) >> 2) + 1; + aplic_write_target(aplic, i, val32); + } else + return -ENODEV; + + aplic_update_irq_range(kvm, 1, aplic->nr_irqs - 1); + + return 0; +} + +static int aplic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *dev, + gpa_t addr, int len, const void *val) +{ + if (len != 4) + return -EOPNOTSUPP; + + return aplic_mmio_write_offset(vcpu->kvm, + addr - vcpu->kvm->arch.aia.aplic_addr, + *((const u32 *)val)); +} + +static struct kvm_io_device_ops aplic_iodoev_ops = { + .read = aplic_mmio_read, + .write = aplic_mmio_write, +}; + +int kvm_riscv_aia_aplic_init(struct kvm *kvm) +{ + int i, ret = 0; + struct aplic *aplic; + + /* Do nothing if we have zero sources */ + if (!kvm->arch.aia.nr_sources) + return 0; + + /* Allocate APLIC global state */ + aplic = kzalloc(sizeof(*aplic), GFP_KERNEL); + if (!aplic) + return -ENOMEM; + kvm->arch.aia.aplic_state = aplic; + + /* Setup APLIC IRQs */ + aplic->nr_irqs = kvm->arch.aia.nr_sources + 1; + aplic->nr_words = DIV_ROUND_UP(aplic->nr_irqs, 32); + aplic->irqs = kcalloc(aplic->nr_irqs, + sizeof(*aplic->irqs), GFP_KERNEL); + if (!aplic->irqs) { + ret = -ENOMEM; + goto fail_free_aplic; + } + for (i = 0; i < aplic->nr_irqs; i++) + raw_spin_lock_init(&aplic->irqs[i].lock); + + /* Setup IO device */ + kvm_iodevice_init(&aplic->iodev, &aplic_iodoev_ops); + mutex_lock(&kvm->slots_lock); + ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, + kvm->arch.aia.aplic_addr, + KVM_DEV_RISCV_APLIC_SIZE, + &aplic->iodev); + mutex_unlock(&kvm->slots_lock); + if (ret) + goto fail_free_aplic_irqs; + + /* Setup default IRQ routing */ + ret = kvm_riscv_setup_default_irq_routing(kvm, aplic->nr_irqs); + if (ret) + goto fail_unreg_iodev; + + return 0; + +fail_unreg_iodev: + mutex_lock(&kvm->slots_lock); + kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &aplic->iodev); + mutex_unlock(&kvm->slots_lock); +fail_free_aplic_irqs: + kfree(aplic->irqs); +fail_free_aplic: + kvm->arch.aia.aplic_state = NULL; + kfree(aplic); + return ret; +} + +void kvm_riscv_aia_aplic_cleanup(struct kvm *kvm) +{ + struct aplic *aplic = kvm->arch.aia.aplic_state; + + if (!aplic) + return; + + mutex_lock(&kvm->slots_lock); + kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &aplic->iodev); + mutex_unlock(&kvm->slots_lock); + + kfree(aplic->irqs); + + kvm->arch.aia.aplic_state = NULL; + kfree(aplic); +}

[07/10] RISC-V: KVM: Add in-kernel emulation of AIA APLIC

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Patch