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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
* Anup Patel <anup.patel@wdc.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/uaccess.h>
#include <asm/cpufeature.h>
#ifdef CONFIG_FPU
void kvm_riscv_vcpu_fp_reset(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
cntx->sstatus &= ~SR_FS;
if (riscv_isa_extension_available(vcpu->arch.isa, f) ||
riscv_isa_extension_available(vcpu->arch.isa, d))
cntx->sstatus |= SR_FS_INITIAL;
else
cntx->sstatus |= SR_FS_OFF;
}
static void kvm_riscv_vcpu_fp_clean(struct kvm_cpu_context *cntx)
{
cntx->sstatus &= ~SR_FS;
cntx->sstatus |= SR_FS_CLEAN;
}
void kvm_riscv_vcpu_guest_fp_save(struct kvm_cpu_context *cntx,
const unsigned long *isa)
{
if ((cntx->sstatus & SR_FS) == SR_FS_DIRTY) {
if (riscv_isa_extension_available(isa, d))
__kvm_riscv_fp_d_save(cntx);
else if (riscv_isa_extension_available(isa, f))
__kvm_riscv_fp_f_save(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
}
void kvm_riscv_vcpu_guest_fp_restore(struct kvm_cpu_context *cntx,
const unsigned long *isa)
{
if ((cntx->sstatus & SR_FS) != SR_FS_OFF) {
if (riscv_isa_extension_available(isa, d))
__kvm_riscv_fp_d_restore(cntx);
else if (riscv_isa_extension_available(isa, f))
__kvm_riscv_fp_f_restore(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
}
void kvm_riscv_vcpu_host_fp_save(struct kvm_cpu_context *cntx)
{
/* No need to check host sstatus as it can be modified outside */
if (riscv_isa_extension_available(NULL, d))
__kvm_riscv_fp_d_save(cntx);
else if (riscv_isa_extension_available(NULL, f))
__kvm_riscv_fp_f_save(cntx);
}
void kvm_riscv_vcpu_host_fp_restore(struct kvm_cpu_context *cntx)
{
if (riscv_isa_extension_available(NULL, d))
__kvm_riscv_fp_d_restore(cntx);
else if (riscv_isa_extension_available(NULL, f))
__kvm_riscv_fp_f_restore(cntx);
}
#endif
int kvm_riscv_vcpu_get_reg_fp(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
rtype);
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
riscv_isa_extension_available(vcpu->arch.isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
reg_val = &cntx->fp.f.fcsr;
else if ((KVM_REG_RISCV_FP_F_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_F_REG(f[31]))
reg_val = &cntx->fp.f.f[reg_num];
else
return -ENOENT;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
riscv_isa_extension_available(vcpu->arch.isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
reg_val = &cntx->fp.d.fcsr;
} else if ((KVM_REG_RISCV_FP_D_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_D_REG(f[31])) {
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
reg_val = &cntx->fp.d.f[reg_num];
} else
return -ENOENT;
} else
return -ENOENT;
if (copy_to_user(uaddr, reg_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
int kvm_riscv_vcpu_set_reg_fp(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
rtype);
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
riscv_isa_extension_available(vcpu->arch.isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
reg_val = &cntx->fp.f.fcsr;
else if ((KVM_REG_RISCV_FP_F_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_F_REG(f[31]))
reg_val = &cntx->fp.f.f[reg_num];
else
return -ENOENT;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
riscv_isa_extension_available(vcpu->arch.isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
reg_val = &cntx->fp.d.fcsr;
} else if ((KVM_REG_RISCV_FP_D_REG(f[0]) <= reg_num) &&
reg_num <= KVM_REG_RISCV_FP_D_REG(f[31])) {
if (KVM_REG_SIZE(reg->id) != sizeof(u64))
return -EINVAL;
reg_val = &cntx->fp.d.f[reg_num];
} else
return -ENOENT;
} else
return -ENOENT;
if (copy_from_user(reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
return 0;
}
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