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| author | Daniel Henrique Barboza <dbarboza@ventanamicro.com> | 2023-12-05 14:45:08 -0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2023-12-29 12:31:54 +0530 |
| commit | 2fa290372dfe7dd248b1c16f943f273a3e674f22 (patch) | |
| tree | ee0c9a875e4f85426d8af9c478cf72fcc622fd15 /arch/riscv/kvm | |
| parent | 197bd237b67268651ac544e8fedbe1fd275d41e0 (diff) | |
| download | linux-stable-2fa290372dfe7dd248b1c16f943f273a3e674f22.tar.gz linux-stable-2fa290372dfe7dd248b1c16f943f273a3e674f22.tar.bz2 linux-stable-2fa290372dfe7dd248b1c16f943f273a3e674f22.zip | |
RISC-V: KVM: add 'vlenb' Vector CSR
Userspace requires 'vlenb' to be able to encode it in reg ID. Otherwise
it is not possible to retrieve any vector reg since we're returning
EINVAL if reg_size isn't vlenb (see kvm_riscv_vcpu_vreg_addr()).
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Anup Patel <anup@brainfault.org>
Diffstat (limited to 'arch/riscv/kvm')
| -rw-r--r-- | arch/riscv/kvm/vcpu_vector.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_vector.c b/arch/riscv/kvm/vcpu_vector.c index 530e49c588d6..d92d1348045c 100644 --- a/arch/riscv/kvm/vcpu_vector.c +++ b/arch/riscv/kvm/vcpu_vector.c @@ -116,6 +116,9 @@ static int kvm_riscv_vcpu_vreg_addr(struct kvm_vcpu *vcpu, case KVM_REG_RISCV_VECTOR_CSR_REG(vcsr): *reg_addr = &cntx->vector.vcsr; break; + case KVM_REG_RISCV_VECTOR_CSR_REG(vlenb): + *reg_addr = &cntx->vector.vlenb; + break; case KVM_REG_RISCV_VECTOR_CSR_REG(datap): default: return -ENOENT; @@ -174,6 +177,18 @@ int kvm_riscv_vcpu_set_reg_vector(struct kvm_vcpu *vcpu, if (!riscv_isa_extension_available(isa, v)) return -ENOENT; + if (reg_num == KVM_REG_RISCV_VECTOR_CSR_REG(vlenb)) { + struct kvm_cpu_context *cntx = &vcpu->arch.guest_context; + unsigned long reg_val; + + if (copy_from_user(®_val, uaddr, reg_size)) + return -EFAULT; + if (reg_val != cntx->vector.vlenb) + return -EINVAL; + + return 0; + } + rc = kvm_riscv_vcpu_vreg_addr(vcpu, reg_num, reg_size, ®_addr); if (rc) return rc; |