diff options
| author | Andrew Jones <ajones@ventanamicro.com> | 2023-02-24 17:26:30 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-03-14 21:26:07 -0700 |
| commit | 665fd8862413f21cd924fc121eadcd32ea122c52 (patch) | |
| tree | 8a92b32d96f95261cf5b9d871d0d7df4cbd8745b /arch/riscv/kvm/vcpu.c | |
| parent | ab0f77465e3e4ec2d2583cd770b157b16cc22844 (diff) | |
| download | lwn-665fd8862413f21cd924fc121eadcd32ea122c52.tar.gz lwn-665fd8862413f21cd924fc121eadcd32ea122c52.zip | |
RISC-V: KVM: Provide UAPI for Zicboz block size
We're about to allow guests to use the Zicboz extension. KVM
userspace needs to know the cache block size in order to
properly advertise it to the guest. Provide a virtual config
register for userspace to get it with the GET_ONE_REG API, but
setting it cannot be supported, so disallow SET_ONE_REG.
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20230224162631.405473-8-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kvm/vcpu.c')
| -rw-r--r-- | arch/riscv/kvm/vcpu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 7d010b0be54e..525d785ccba2 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -283,6 +283,11 @@ static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu, return -EINVAL; reg_val = riscv_cbom_block_size; break; + case KVM_REG_RISCV_CONFIG_REG(zicboz_block_size): + if (!riscv_isa_extension_available(vcpu->arch.isa, ZICBOZ)) + return -EINVAL; + reg_val = riscv_cboz_block_size; + break; case KVM_REG_RISCV_CONFIG_REG(mvendorid): reg_val = vcpu->arch.mvendorid; break; @@ -354,6 +359,8 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu, break; case KVM_REG_RISCV_CONFIG_REG(zicbom_block_size): return -EOPNOTSUPP; + case KVM_REG_RISCV_CONFIG_REG(zicboz_block_size): + return -EOPNOTSUPP; case KVM_REG_RISCV_CONFIG_REG(mvendorid): if (!vcpu->arch.ran_atleast_once) vcpu->arch.mvendorid = reg_val; |