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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2024 Ventana Micro Systems Inc.
*/
#ifndef __KVM_NACL_H
#define __KVM_NACL_H
#include <linux/jump_label.h>
#include <linux/percpu.h>
#include <asm/byteorder.h>
#include <asm/csr.h>
#include <asm/sbi.h>
struct kvm_vcpu_arch;
DECLARE_STATIC_KEY_FALSE(kvm_riscv_nacl_available);
#define kvm_riscv_nacl_available() \
static_branch_unlikely(&kvm_riscv_nacl_available)
DECLARE_STATIC_KEY_FALSE(kvm_riscv_nacl_sync_csr_available);
#define kvm_riscv_nacl_sync_csr_available() \
static_branch_unlikely(&kvm_riscv_nacl_sync_csr_available)
DECLARE_STATIC_KEY_FALSE(kvm_riscv_nacl_sync_hfence_available);
#define kvm_riscv_nacl_sync_hfence_available() \
static_branch_unlikely(&kvm_riscv_nacl_sync_hfence_available)
DECLARE_STATIC_KEY_FALSE(kvm_riscv_nacl_sync_sret_available);
#define kvm_riscv_nacl_sync_sret_available() \
static_branch_unlikely(&kvm_riscv_nacl_sync_sret_available)
DECLARE_STATIC_KEY_FALSE(kvm_riscv_nacl_autoswap_csr_available);
#define kvm_riscv_nacl_autoswap_csr_available() \
static_branch_unlikely(&kvm_riscv_nacl_autoswap_csr_available)
struct kvm_riscv_nacl {
void *shmem;
phys_addr_t shmem_phys;
};
DECLARE_PER_CPU(struct kvm_riscv_nacl, kvm_riscv_nacl);
void __kvm_riscv_nacl_hfence(void *shmem,
unsigned long control,
unsigned long page_num,
unsigned long page_count);
void __kvm_riscv_nacl_switch_to(struct kvm_vcpu_arch *vcpu_arch,
unsigned long sbi_ext_id,
unsigned long sbi_func_id);
int kvm_riscv_nacl_enable(void);
void kvm_riscv_nacl_disable(void);
void kvm_riscv_nacl_exit(void);
int kvm_riscv_nacl_init(void);
#ifdef CONFIG_32BIT
#define lelong_to_cpu(__x) le32_to_cpu(__x)
#define cpu_to_lelong(__x) cpu_to_le32(__x)
#else
#define lelong_to_cpu(__x) le64_to_cpu(__x)
#define cpu_to_lelong(__x) cpu_to_le64(__x)
#endif
#define nacl_shmem() \
this_cpu_ptr(&kvm_riscv_nacl)->shmem
#define nacl_scratch_read_long(__shmem, __offset) \
({ \
unsigned long *__p = (__shmem) + \
SBI_NACL_SHMEM_SCRATCH_OFFSET + \
(__offset); \
lelong_to_cpu(*__p); \
})
#define nacl_scratch_write_long(__shmem, __offset, __val) \
do { \
unsigned long *__p = (__shmem) + \
SBI_NACL_SHMEM_SCRATCH_OFFSET + \
(__offset); \
*__p = cpu_to_lelong(__val); \
} while (0)
#define nacl_scratch_write_longs(__shmem, __offset, __array, __count) \
do { \
unsigned int __i; \
unsigned long *__p = (__shmem) + \
SBI_NACL_SHMEM_SCRATCH_OFFSET + \
(__offset); \
for (__i = 0; __i < (__count); __i++) \
__p[__i] = cpu_to_lelong((__array)[__i]); \
} while (0)
#define nacl_sync_hfence(__e) \
sbi_ecall(SBI_EXT_NACL, SBI_EXT_NACL_SYNC_HFENCE, \
(__e), 0, 0, 0, 0, 0)
#define nacl_hfence_mkconfig(__type, __order, __vmid, __asid) \
({ \
unsigned long __c = SBI_NACL_SHMEM_HFENCE_CONFIG_PEND; \
__c |= ((__type) & SBI_NACL_SHMEM_HFENCE_CONFIG_TYPE_MASK) \
<< SBI_NACL_SHMEM_HFENCE_CONFIG_TYPE_SHIFT; \
__c |= (((__order) - SBI_NACL_SHMEM_HFENCE_ORDER_BASE) & \
SBI_NACL_SHMEM_HFENCE_CONFIG_ORDER_MASK) \
<< SBI_NACL_SHMEM_HFENCE_CONFIG_ORDER_SHIFT; \
__c |= ((__vmid) & SBI_NACL_SHMEM_HFENCE_CONFIG_VMID_MASK) \
<< SBI_NACL_SHMEM_HFENCE_CONFIG_VMID_SHIFT; \
__c |= ((__asid) & SBI_NACL_SHMEM_HFENCE_CONFIG_ASID_MASK); \
__c; \
})
#define nacl_hfence_mkpnum(__order, __addr) \
((__addr) >> (__order))
#define nacl_hfence_mkpcount(__order, __size) \
((__size) >> (__order))
#define nacl_hfence_gvma(__shmem, __gpa, __gpsz, __order) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_GVMA, \
__order, 0, 0), \
nacl_hfence_mkpnum(__order, __gpa), \
nacl_hfence_mkpcount(__order, __gpsz))
#define nacl_hfence_gvma_all(__shmem) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_GVMA_ALL, \
0, 0, 0), 0, 0)
#define nacl_hfence_gvma_vmid(__shmem, __vmid, __gpa, __gpsz, __order) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_GVMA_VMID, \
__order, __vmid, 0), \
nacl_hfence_mkpnum(__order, __gpa), \
nacl_hfence_mkpcount(__order, __gpsz))
#define nacl_hfence_gvma_vmid_all(__shmem, __vmid) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_GVMA_VMID_ALL, \
0, __vmid, 0), 0, 0)
#define nacl_hfence_vvma(__shmem, __vmid, __gva, __gvsz, __order) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_VVMA, \
__order, __vmid, 0), \
nacl_hfence_mkpnum(__order, __gva), \
nacl_hfence_mkpcount(__order, __gvsz))
#define nacl_hfence_vvma_all(__shmem, __vmid) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_VVMA_ALL, \
0, __vmid, 0), 0, 0)
#define nacl_hfence_vvma_asid(__shmem, __vmid, __asid, __gva, __gvsz, __order)\
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_VVMA_ASID, \
__order, __vmid, __asid), \
nacl_hfence_mkpnum(__order, __gva), \
nacl_hfence_mkpcount(__order, __gvsz))
#define nacl_hfence_vvma_asid_all(__shmem, __vmid, __asid) \
__kvm_riscv_nacl_hfence(__shmem, \
nacl_hfence_mkconfig(SBI_NACL_SHMEM_HFENCE_TYPE_VVMA_ASID_ALL, \
0, __vmid, __asid), 0, 0)
#define nacl_csr_read(__shmem, __csr) \
({ \
unsigned long *__a = (__shmem) + SBI_NACL_SHMEM_CSR_OFFSET; \
lelong_to_cpu(__a[SBI_NACL_SHMEM_CSR_INDEX(__csr)]); \
})
#define nacl_csr_write(__shmem, __csr, __val) \
do { \
void *__s = (__shmem); \
unsigned int __i = SBI_NACL_SHMEM_CSR_INDEX(__csr); \
unsigned long *__a = (__s) + SBI_NACL_SHMEM_CSR_OFFSET; \
u8 *__b = (__s) + SBI_NACL_SHMEM_DBITMAP_OFFSET; \
__a[__i] = cpu_to_lelong(__val); \
__b[__i >> 3] |= 1U << (__i & 0x7); \
} while (0)
#define nacl_csr_swap(__shmem, __csr, __val) \
({ \
void *__s = (__shmem); \
unsigned int __i = SBI_NACL_SHMEM_CSR_INDEX(__csr); \
unsigned long *__a = (__s) + SBI_NACL_SHMEM_CSR_OFFSET; \
u8 *__b = (__s) + SBI_NACL_SHMEM_DBITMAP_OFFSET; \
unsigned long __r = lelong_to_cpu(__a[__i]); \
__a[__i] = cpu_to_lelong(__val); \
__b[__i >> 3] |= 1U << (__i & 0x7); \
__r; \
})
#define nacl_sync_csr(__csr) \
sbi_ecall(SBI_EXT_NACL, SBI_EXT_NACL_SYNC_CSR, \
(__csr), 0, 0, 0, 0, 0)
/*
* Each ncsr_xyz() macro defined below has it's own static-branch so every
* use of ncsr_xyz() macro emits a patchable direct jump. This means multiple
* back-to-back ncsr_xyz() macro usage will emit multiple patchable direct
* jumps which is sub-optimal.
*
* Based on the above, it is recommended to avoid multiple back-to-back
* ncsr_xyz() macro usage.
*/
#define ncsr_read(__csr) \
({ \
unsigned long __r; \
if (kvm_riscv_nacl_available()) \
__r = nacl_csr_read(nacl_shmem(), __csr); \
else \
__r = csr_read(__csr); \
__r; \
})
#define ncsr_write(__csr, __val) \
do { \
if (kvm_riscv_nacl_sync_csr_available()) \
nacl_csr_write(nacl_shmem(), __csr, __val); \
else \
csr_write(__csr, __val); \
} while (0)
#define ncsr_swap(__csr, __val) \
({ \
unsigned long __r; \
if (kvm_riscv_nacl_sync_csr_available()) \
__r = nacl_csr_swap(nacl_shmem(), __csr, __val); \
else \
__r = csr_swap(__csr, __val); \
__r; \
})
#define nsync_csr(__csr) \
do { \
if (kvm_riscv_nacl_sync_csr_available()) \
nacl_sync_csr(__csr); \
} while (0)
#endif
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