Re: [PATCH v3 07/10] RISC-V: KVM: Add in-kernel emulation of AIA APLIC

[Atish Patra]

On Thu, Jun 15, 2023 at 12:34 AM Anup Patel <apatel@xxxxxxxxxxxxxxxx> wrote:
>
> There is no virtualization support in AIA APLIC so we add in-kernel
> emulation of AIA APLIC which only supports MSI-mode (i.e. wired
> interrupts forwarded to AIA IMSIC as MSIs).
>
> Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
> ---
>  arch/riscv/include/asm/kvm_aia.h |  17 +-
>  arch/riscv/kvm/Makefile          |   1 +
>  arch/riscv/kvm/aia_aplic.c       | 576 +++++++++++++++++++++++++++++++
>  3 files changed, 580 insertions(+), 14 deletions(-)
>  create mode 100644 arch/riscv/kvm/aia_aplic.c
>
> 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..eecd8f4abe21
> --- /dev/null
> +++ b/arch/riscv/kvm/aia_aplic.c
> @@ -0,0 +1,576 @@
> +// 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@xxxxxxxxxxxxxxxx>
> + */
> +
> +#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) ==
> +                   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) ==
> +                  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);
> +}
> --
> 2.34.1
>


Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>
-- 
Regards,
Atish