From 54e43320c2ba0c70258a3aea690da38c6ea3293c Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Tue, 10 Jan 2023 16:44:25 +0530 Subject: [PATCH] RISC-V: KVM: Initial skeletal support for AIA To incrementally implement AIA support, we first add minimal skeletal support which only compiles and detects AIA hardware support at the boot-time but does not provide any functionality. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Andrew Jones Signed-off-by: Anup Patel --- arch/riscv/include/asm/hwcap.h | 6 +++ arch/riscv/include/asm/kvm_aia.h | 109 ++++++++++++++++++++++++++++++++++++++ arch/riscv/include/asm/kvm_host.h | 7 +++ arch/riscv/kvm/Makefile | 1 + arch/riscv/kvm/aia.c | 66 +++++++++++++++++++++++ arch/riscv/kvm/main.c | 22 +++++++- arch/riscv/kvm/vcpu.c | 45 ++++++++++++++-- arch/riscv/kvm/vcpu_insn.c | 1 + arch/riscv/kvm/vm.c | 4 ++ 9 files changed, 255 insertions(+), 6 deletions(-) create mode 100644 arch/riscv/include/asm/kvm_aia.h create mode 100644 arch/riscv/kvm/aia.c diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h index 74f5dab..ab2abf5 100644 --- a/arch/riscv/include/asm/hwcap.h +++ b/arch/riscv/include/asm/hwcap.h @@ -48,6 +48,12 @@ #define RISCV_ISA_EXT_MAX 64 #define RISCV_ISA_EXT_NAME_LEN_MAX 32 +#ifdef CONFIG_RISCV_M_MODE +#define RISCV_ISA_EXT_SxAIA RISCV_ISA_EXT_SMAIA +#else +#define RISCV_ISA_EXT_SxAIA RISCV_ISA_EXT_SSAIA +#endif + #ifndef __ASSEMBLY__ #include diff --git a/arch/riscv/include/asm/kvm_aia.h b/arch/riscv/include/asm/kvm_aia.h new file mode 100644 index 0000000..258a835 --- /dev/null +++ b/arch/riscv/include/asm/kvm_aia.h @@ -0,0 +1,109 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + * Copyright (C) 2022 Ventana Micro Systems Inc. + * + * Authors: + * Anup Patel + */ + +#ifndef __KVM_RISCV_AIA_H +#define __KVM_RISCV_AIA_H + +#include +#include + +struct kvm_aia { + /* In-kernel irqchip created */ + bool in_kernel; + + /* In-kernel irqchip initialized */ + bool initialized; +}; + +struct kvm_vcpu_aia { +}; + +#define kvm_riscv_aia_initialized(k) ((k)->arch.aia.initialized) + +#define irqchip_in_kernel(k) ((k)->arch.aia.in_kernel) + +DECLARE_STATIC_KEY_FALSE(kvm_riscv_aia_available); +#define kvm_riscv_aia_available() \ + static_branch_unlikely(&kvm_riscv_aia_available) + +static inline void kvm_riscv_vcpu_aia_flush_interrupts(struct kvm_vcpu *vcpu) +{ +} + +static inline void kvm_riscv_vcpu_aia_sync_interrupts(struct kvm_vcpu *vcpu) +{ +} + +static inline bool kvm_riscv_vcpu_aia_has_interrupts(struct kvm_vcpu *vcpu, + u64 mask) +{ + return false; +} + +static inline void kvm_riscv_vcpu_aia_update_hvip(struct kvm_vcpu *vcpu) +{ +} + +static inline void kvm_riscv_vcpu_aia_load(struct kvm_vcpu *vcpu, int cpu) +{ +} + +static inline void kvm_riscv_vcpu_aia_put(struct kvm_vcpu *vcpu) +{ +} + +static inline int kvm_riscv_vcpu_aia_get_csr(struct kvm_vcpu *vcpu, + unsigned long reg_num, + unsigned long *out_val) +{ + *out_val = 0; + return 0; +} + +static inline int kvm_riscv_vcpu_aia_set_csr(struct kvm_vcpu *vcpu, + unsigned long reg_num, + unsigned long val) +{ + return 0; +} + +#define KVM_RISCV_VCPU_AIA_CSR_FUNCS + +static inline int kvm_riscv_vcpu_aia_update(struct kvm_vcpu *vcpu) +{ + return 1; +} + +static inline void kvm_riscv_vcpu_aia_reset(struct kvm_vcpu *vcpu) +{ +} + +static inline int kvm_riscv_vcpu_aia_init(struct kvm_vcpu *vcpu) +{ + return 0; +} + +static inline void kvm_riscv_vcpu_aia_deinit(struct kvm_vcpu *vcpu) +{ +} + +static inline void kvm_riscv_aia_init_vm(struct kvm *kvm) +{ +} + +static inline void kvm_riscv_aia_destroy_vm(struct kvm *kvm) +{ +} + +void kvm_riscv_aia_enable(void); +void kvm_riscv_aia_disable(void); +int kvm_riscv_aia_init(void); +void kvm_riscv_aia_exit(void); + +#endif diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index cc7da66e..3157cf7 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -94,6 +95,9 @@ struct kvm_arch { /* Guest Timer */ struct kvm_guest_timer timer; + + /* AIA Guest/VM context */ + struct kvm_aia aia; }; struct kvm_cpu_trap { @@ -221,6 +225,9 @@ struct kvm_vcpu_arch { /* SBI context */ struct kvm_vcpu_sbi_context sbi_context; + /* AIA VCPU context */ + struct kvm_vcpu_aia aia_context; + /* Cache pages needed to program page tables with spinlock held */ struct kvm_mmu_memory_cache mmu_page_cache; diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile index 278e97c..8031b89 100644 --- a/arch/riscv/kvm/Makefile +++ b/arch/riscv/kvm/Makefile @@ -26,3 +26,4 @@ kvm-y += vcpu_sbi_replace.o kvm-y += vcpu_sbi_hsm.o kvm-y += vcpu_timer.o kvm-$(CONFIG_RISCV_PMU_SBI) += vcpu_pmu.o vcpu_sbi_pmu.o +kvm-y += aia.o diff --git a/arch/riscv/kvm/aia.c b/arch/riscv/kvm/aia.c new file mode 100644 index 0000000..7a63333 --- /dev/null +++ b/arch/riscv/kvm/aia.c @@ -0,0 +1,66 @@ +// 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 + */ + +#include +#include + +DEFINE_STATIC_KEY_FALSE(kvm_riscv_aia_available); + +static void aia_set_hvictl(bool ext_irq_pending) +{ + unsigned long hvictl; + + /* + * HVICTL.IID == 9 and HVICTL.IPRIO == 0 represents + * no interrupt in HVICTL. + */ + + hvictl = (IRQ_S_EXT << HVICTL_IID_SHIFT) & HVICTL_IID; + hvictl |= ext_irq_pending; + csr_write(CSR_HVICTL, hvictl); +} + +void kvm_riscv_aia_enable(void) +{ + if (!kvm_riscv_aia_available()) + return; + + aia_set_hvictl(false); + csr_write(CSR_HVIPRIO1, 0x0); + csr_write(CSR_HVIPRIO2, 0x0); +#ifdef CONFIG_32BIT + csr_write(CSR_HVIPH, 0x0); + csr_write(CSR_HIDELEGH, 0x0); + csr_write(CSR_HVIPRIO1H, 0x0); + csr_write(CSR_HVIPRIO2H, 0x0); +#endif +} + +void kvm_riscv_aia_disable(void) +{ + if (!kvm_riscv_aia_available()) + return; + + aia_set_hvictl(false); +} + +int kvm_riscv_aia_init(void) +{ + if (!riscv_isa_extension_available(NULL, SxAIA)) + return -ENODEV; + + /* Enable KVM AIA support */ + static_branch_enable(&kvm_riscv_aia_available); + + return 0; +} + +void kvm_riscv_aia_exit(void) +{ +} diff --git a/arch/riscv/kvm/main.c b/arch/riscv/kvm/main.c index 41ad763..6396352b 100644 --- a/arch/riscv/kvm/main.c +++ b/arch/riscv/kvm/main.c @@ -44,11 +44,15 @@ int kvm_arch_hardware_enable(void) csr_write(CSR_HVIP, 0); + kvm_riscv_aia_enable(); + return 0; } void kvm_arch_hardware_disable(void) { + kvm_riscv_aia_disable(); + /* * After clearing the hideleg CSR, the host kernel will receive * spurious interrupts if hvip CSR has pending interrupts and the @@ -63,6 +67,7 @@ void kvm_arch_hardware_disable(void) static int __init riscv_kvm_init(void) { + int rc; const char *str; if (!riscv_isa_extension_available(NULL, h)) { @@ -84,6 +89,10 @@ static int __init riscv_kvm_init(void) kvm_riscv_gstage_vmid_detect(); + rc = kvm_riscv_aia_init(); + if (rc && rc != -ENODEV) + return rc; + kvm_info("hypervisor extension available\n"); switch (kvm_riscv_gstage_mode()) { @@ -106,12 +115,23 @@ static int __init riscv_kvm_init(void) kvm_info("VMID %ld bits available\n", kvm_riscv_gstage_vmid_bits()); - return kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); + if (kvm_riscv_aia_available()) + kvm_info("AIA available\n"); + + rc = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); + if (rc) { + kvm_riscv_aia_exit(); + return rc; + } + + return 0; } module_init(riscv_kvm_init); static void __exit riscv_kvm_exit(void) { + kvm_riscv_aia_exit(); + kvm_exit(); } module_exit(riscv_kvm_exit); diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 02b49cb..b46e9cc 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -137,6 +137,8 @@ static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu) kvm_riscv_vcpu_timer_reset(vcpu); + kvm_riscv_vcpu_aia_reset(vcpu); + WRITE_ONCE(vcpu->arch.irqs_pending, 0); WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0); @@ -159,6 +161,7 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { + int rc; struct kvm_cpu_context *cntx; struct kvm_vcpu_csr *reset_csr = &vcpu->arch.guest_reset_csr; unsigned long host_isa, i; @@ -201,6 +204,11 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) /* setup performance monitoring */ kvm_riscv_vcpu_pmu_init(vcpu); + /* Setup VCPU AIA */ + rc = kvm_riscv_vcpu_aia_init(vcpu); + if (rc) + return rc; + /* Reset VCPU */ kvm_riscv_reset_vcpu(vcpu); @@ -220,6 +228,9 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { + /* Cleanup VCPU AIA context */ + kvm_riscv_vcpu_aia_deinit(vcpu); + /* Cleanup VCPU timer */ kvm_riscv_vcpu_timer_deinit(vcpu); @@ -741,6 +752,9 @@ void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu) csr->hvip &= ~mask; csr->hvip |= val; } + + /* Flush AIA high interrupts */ + kvm_riscv_vcpu_aia_flush_interrupts(vcpu); } void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu) @@ -766,6 +780,9 @@ void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu) } } + /* Sync-up AIA high interrupts */ + kvm_riscv_vcpu_aia_sync_interrupts(vcpu); + /* Sync-up timer CSRs */ kvm_riscv_vcpu_timer_sync(vcpu); } @@ -802,10 +819,15 @@ int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq) bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask) { - unsigned long ie = ((vcpu->arch.guest_csr.vsie & VSIP_VALID_MASK) - << VSIP_TO_HVIP_SHIFT) & mask; + unsigned long ie; + + ie = ((vcpu->arch.guest_csr.vsie & VSIP_VALID_MASK) + << VSIP_TO_HVIP_SHIFT) & mask; + if (READ_ONCE(vcpu->arch.irqs_pending) & ie) + return true; - return (READ_ONCE(vcpu->arch.irqs_pending) & ie) ? true : false; + /* Check AIA high interrupts */ + return kvm_riscv_vcpu_aia_has_interrupts(vcpu, mask); } void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu) @@ -901,6 +923,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_riscv_vcpu_guest_fp_restore(&vcpu->arch.guest_context, vcpu->arch.isa); + kvm_riscv_vcpu_aia_load(vcpu, cpu); + vcpu->cpu = cpu; } @@ -910,6 +934,8 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) vcpu->cpu = -1; + kvm_riscv_vcpu_aia_put(vcpu); + kvm_riscv_vcpu_guest_fp_save(&vcpu->arch.guest_context, vcpu->arch.isa); kvm_riscv_vcpu_host_fp_restore(&vcpu->arch.host_context); @@ -977,6 +1003,7 @@ static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu) struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr; csr_write(CSR_HVIP, csr->hvip); + kvm_riscv_vcpu_aia_update_hvip(vcpu); } /* @@ -1049,6 +1076,15 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) kvm_riscv_check_vcpu_requests(vcpu); + preempt_disable(); + + /* Update AIA HW state before entering guest */ + ret = kvm_riscv_vcpu_aia_update(vcpu); + if (ret <= 0) { + preempt_enable(); + continue; + } + local_irq_disable(); /* @@ -1077,6 +1113,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) xfer_to_guest_mode_work_pending()) { vcpu->mode = OUTSIDE_GUEST_MODE; local_irq_enable(); + preempt_enable(); kvm_vcpu_srcu_read_lock(vcpu); continue; } @@ -1110,8 +1147,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) /* Syncup interrupts state with HW */ kvm_riscv_vcpu_sync_interrupts(vcpu); - preempt_disable(); - /* * We must ensure that any pending interrupts are taken before * we exit guest timing so that timer ticks are accounted as diff --git a/arch/riscv/kvm/vcpu_insn.c b/arch/riscv/kvm/vcpu_insn.c index f689337..7a6abed 100644 --- a/arch/riscv/kvm/vcpu_insn.c +++ b/arch/riscv/kvm/vcpu_insn.c @@ -214,6 +214,7 @@ struct csr_func { }; static const struct csr_func csr_funcs[] = { + KVM_RISCV_VCPU_AIA_CSR_FUNCS KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS }; diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index 65a964d..bc03d2d 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -41,6 +41,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) return r; } + kvm_riscv_aia_init_vm(kvm); + kvm_riscv_guest_timer_init(kvm); return 0; @@ -49,6 +51,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) void kvm_arch_destroy_vm(struct kvm *kvm) { kvm_destroy_vcpus(kvm); + + kvm_riscv_aia_destroy_vm(kvm); } int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) -- 2.7.4