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RISC-V: KVM: add 'vlenb' Vector CSR

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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>
This commit is contained in:
Daniel Henrique Barboza 2023-12-05 14:45:08 -03:00 committed by Anup Patel
parent 197bd237b6
commit 2fa290372d
1 changed files with 15 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
arch/riscv/kvm/vcpu_vector.c
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@ -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(&reg_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, &reg_addr);
if (rc)
return rc;