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RISC-V: KVM: add vector registers and CSRs in KVM_GET_REG_LIST

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Add all vector registers and CSRs (vstart, vl, vtype, vcsr, vlenb) in
get-reg-list.

Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Daniel Henrique Barboza
2023-12-05 14:45:09 -03:00
committed by Anup Patel
parent 2fa290372d
commit 3975525e55
1 changed files with 55 additions and 0 deletions
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55
arch/riscv/kvm/vcpu_onereg.c
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@@ -961,6 +961,55 @@ static unsigned long num_sbi_ext_regs(struct kvm_vcpu *vcpu)
return copy_sbi_ext_reg_indices(vcpu, NULL);
}
static inline unsigned long num_vector_regs(const struct kvm_vcpu *vcpu)
{
if (!riscv_isa_extension_available(vcpu->arch.isa, v))
return 0;
/* vstart, vl, vtype, vcsr, vlenb and 32 vector regs */
return 37;
}
static int copy_vector_reg_indices(const struct kvm_vcpu *vcpu,
u64 __user *uindices)
{
const struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
int n = num_vector_regs(vcpu);
u64 reg, size;
int i;
if (n == 0)
return 0;
/* copy vstart, vl, vtype, vcsr and vlenb */
size = IS_ENABLED(CONFIG_32BIT) ? KVM_REG_SIZE_U32 : KVM_REG_SIZE_U64;
for (i = 0; i < 5; i++) {
reg = KVM_REG_RISCV | size | KVM_REG_RISCV_VECTOR | i;
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
}
/* vector_regs have a variable 'vlenb' size */
size = __builtin_ctzl(cntx->vector.vlenb);
size <<= KVM_REG_SIZE_SHIFT;
for (i = 0; i < 32; i++) {
reg = KVM_REG_RISCV | KVM_REG_RISCV_VECTOR | size |
KVM_REG_RISCV_VECTOR_REG(i);
if (uindices) {
if (put_user(reg, uindices))
return -EFAULT;
uindices++;
}
}
return n;
}
/*
* kvm_riscv_vcpu_num_regs - how many registers do we present via KVM_GET/SET_ONE_REG
*
@@ -976,6 +1025,7 @@ unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu)
res += num_timer_regs();
res += num_fp_f_regs(vcpu);
res += num_fp_d_regs(vcpu);
res += num_vector_regs(vcpu);
res += num_isa_ext_regs(vcpu);
res += num_sbi_ext_regs(vcpu);
@@ -1020,6 +1070,11 @@ int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu,
return ret;
uindices += ret;
ret = copy_vector_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;
uindices += ret;
ret = copy_isa_ext_reg_indices(vcpu, uindices);
if (ret < 0)
return ret;