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Diffstat (limited to 'arch/riscv/include/asm/kvm_host.h')
| -rw-r--r-- | arch/riscv/include/asm/kvm_host.h | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h new file mode 100644 index 000000000..dbbf43d52 --- /dev/null +++ b/arch/riscv/include/asm/kvm_host.h @@ -0,0 +1,333 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2019 Western Digital Corporation or its affiliates. + * + * Authors: + * Anup Patel <anup.patel@wdc.com> + */ + +#ifndef __RISCV_KVM_HOST_H__ +#define __RISCV_KVM_HOST_H__ + +#include <linux/types.h> +#include <linux/kvm.h> +#include <linux/kvm_types.h> +#include <linux/spinlock.h> +#include <asm/csr.h> +#include <asm/hwcap.h> +#include <asm/kvm_vcpu_fp.h> +#include <asm/kvm_vcpu_insn.h> +#include <asm/kvm_vcpu_timer.h> + +#define KVM_MAX_VCPUS 1024 + +#define KVM_HALT_POLL_NS_DEFAULT 500000 + +#define KVM_VCPU_MAX_FEATURES 0 + +#define KVM_REQ_SLEEP \ + KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1) +#define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2) +#define KVM_REQ_FENCE_I \ + KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_HFENCE_GVMA_VMID_ALL KVM_REQ_TLB_FLUSH +#define KVM_REQ_HFENCE_VVMA_ALL \ + KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) +#define KVM_REQ_HFENCE \ + KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) + +enum kvm_riscv_hfence_type { + KVM_RISCV_HFENCE_UNKNOWN = 0, + KVM_RISCV_HFENCE_GVMA_VMID_GPA, + KVM_RISCV_HFENCE_VVMA_ASID_GVA, + KVM_RISCV_HFENCE_VVMA_ASID_ALL, + KVM_RISCV_HFENCE_VVMA_GVA, +}; + +struct kvm_riscv_hfence { + enum kvm_riscv_hfence_type type; + unsigned long asid; + unsigned long order; + gpa_t addr; + gpa_t size; +}; + +#define KVM_RISCV_VCPU_MAX_HFENCE 64 + +struct kvm_vm_stat { + struct kvm_vm_stat_generic generic; +}; + +struct kvm_vcpu_stat { + struct kvm_vcpu_stat_generic generic; + u64 ecall_exit_stat; + u64 wfi_exit_stat; + u64 mmio_exit_user; + u64 mmio_exit_kernel; + u64 csr_exit_user; + u64 csr_exit_kernel; + u64 signal_exits; + u64 exits; +}; + +struct kvm_arch_memory_slot { +}; + +struct kvm_vmid { + /* + * Writes to vmid_version and vmid happen with vmid_lock held + * whereas reads happen without any lock held. + */ + unsigned long vmid_version; + unsigned long vmid; +}; + +struct kvm_arch { + /* G-stage vmid */ + struct kvm_vmid vmid; + + /* G-stage page table */ + pgd_t *pgd; + phys_addr_t pgd_phys; + + /* Guest Timer */ + struct kvm_guest_timer timer; +}; + +struct kvm_sbi_context { + int return_handled; +}; + +struct kvm_cpu_trap { + unsigned long sepc; + unsigned long scause; + unsigned long stval; + unsigned long htval; + unsigned long htinst; +}; + +struct kvm_cpu_context { + unsigned long zero; + unsigned long ra; + unsigned long sp; + unsigned long gp; + unsigned long tp; + unsigned long t0; + unsigned long t1; + unsigned long t2; + unsigned long s0; + unsigned long s1; + unsigned long a0; + unsigned long a1; + unsigned long a2; + unsigned long a3; + unsigned long a4; + unsigned long a5; + unsigned long a6; + unsigned long a7; + unsigned long s2; + unsigned long s3; + unsigned long s4; + unsigned long s5; + unsigned long s6; + unsigned long s7; + unsigned long s8; + unsigned long s9; + unsigned long s10; + unsigned long s11; + unsigned long t3; + unsigned long t4; + unsigned long t5; + unsigned long t6; + unsigned long sepc; + unsigned long sstatus; + unsigned long hstatus; + union __riscv_fp_state fp; +}; + +struct kvm_vcpu_csr { + unsigned long vsstatus; + unsigned long vsie; + unsigned long vstvec; + unsigned long vsscratch; + unsigned long vsepc; + unsigned long vscause; + unsigned long vstval; + unsigned long hvip; + unsigned long vsatp; + unsigned long scounteren; +}; + +struct kvm_vcpu_arch { + /* VCPU ran at least once */ + bool ran_atleast_once; + + /* Last Host CPU on which Guest VCPU exited */ + int last_exit_cpu; + + /* ISA feature bits (similar to MISA) */ + DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX); + + /* SSCRATCH, STVEC, and SCOUNTEREN of Host */ + unsigned long host_sscratch; + unsigned long host_stvec; + unsigned long host_scounteren; + + /* CPU context of Host */ + struct kvm_cpu_context host_context; + + /* CPU context of Guest VCPU */ + struct kvm_cpu_context guest_context; + + /* CPU CSR context of Guest VCPU */ + struct kvm_vcpu_csr guest_csr; + + /* CPU context upon Guest VCPU reset */ + struct kvm_cpu_context guest_reset_context; + + /* CPU CSR context upon Guest VCPU reset */ + struct kvm_vcpu_csr guest_reset_csr; + + /* + * VCPU interrupts + * + * We have a lockless approach for tracking pending VCPU interrupts + * implemented using atomic bitops. The irqs_pending bitmap represent + * pending interrupts whereas irqs_pending_mask represent bits changed + * in irqs_pending. Our approach is modeled around multiple producer + * and single consumer problem where the consumer is the VCPU itself. + */ + unsigned long irqs_pending; + unsigned long irqs_pending_mask; + + /* VCPU Timer */ + struct kvm_vcpu_timer timer; + + /* HFENCE request queue */ + spinlock_t hfence_lock; + unsigned long hfence_head; + unsigned long hfence_tail; + struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE]; + + /* MMIO instruction details */ + struct kvm_mmio_decode mmio_decode; + + /* CSR instruction details */ + struct kvm_csr_decode csr_decode; + + /* SBI context */ + struct kvm_sbi_context sbi_context; + + /* Cache pages needed to program page tables with spinlock held */ + struct kvm_mmu_memory_cache mmu_page_cache; + + /* VCPU power-off state */ + bool power_off; + + /* Don't run the VCPU (blocked) */ + bool pause; +}; + +static inline void kvm_arch_hardware_unsetup(void) {} +static inline void kvm_arch_sync_events(struct kvm *kvm) {} +static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} + +#define KVM_ARCH_WANT_MMU_NOTIFIER + +#define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12 + +void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid, + gpa_t gpa, gpa_t gpsz, + unsigned long order); +void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid); +void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz, + unsigned long order); +void kvm_riscv_local_hfence_gvma_all(void); +void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid, + unsigned long asid, + unsigned long gva, + unsigned long gvsz, + unsigned long order); +void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid, + unsigned long asid); +void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid, + unsigned long gva, unsigned long gvsz, + unsigned long order); +void kvm_riscv_local_hfence_vvma_all(unsigned long vmid); + +void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu); + +void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu); +void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu); +void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu); +void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu); + +void kvm_riscv_fence_i(struct kvm *kvm, + unsigned long hbase, unsigned long hmask); +void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm, + unsigned long hbase, unsigned long hmask, + gpa_t gpa, gpa_t gpsz, + unsigned long order); +void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm, + unsigned long hbase, unsigned long hmask); +void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm, + unsigned long hbase, unsigned long hmask, + unsigned long gva, unsigned long gvsz, + unsigned long order, unsigned long asid); +void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm, + unsigned long hbase, unsigned long hmask, + unsigned long asid); +void kvm_riscv_hfence_vvma_gva(struct kvm *kvm, + unsigned long hbase, unsigned long hmask, + unsigned long gva, unsigned long gvsz, + unsigned long order); +void kvm_riscv_hfence_vvma_all(struct kvm *kvm, + unsigned long hbase, unsigned long hmask); + +int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa, + phys_addr_t hpa, unsigned long size, + bool writable, bool in_atomic); +void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa, + unsigned long size); +int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu, + struct kvm_memory_slot *memslot, + gpa_t gpa, unsigned long hva, bool is_write); +int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm); +void kvm_riscv_gstage_free_pgd(struct kvm *kvm); +void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu); +void kvm_riscv_gstage_mode_detect(void); +unsigned long kvm_riscv_gstage_mode(void); +int kvm_riscv_gstage_gpa_bits(void); + +void kvm_riscv_gstage_vmid_detect(void); +unsigned long kvm_riscv_gstage_vmid_bits(void); +int kvm_riscv_gstage_vmid_init(struct kvm *kvm); +bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid); +void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu); + +void __kvm_riscv_unpriv_trap(void); + +unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, + bool read_insn, + unsigned long guest_addr, + struct kvm_cpu_trap *trap); +void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu, + struct kvm_cpu_trap *trap); +int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, + struct kvm_cpu_trap *trap); + +void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch); + +int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); +int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); +void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu); +void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu); +bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask); +void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); +void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); + +int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run); +int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run); + +#endif /* __RISCV_KVM_HOST_H__ */ |