Hi Reiji,
On 11/17/21 7:43 AM, Reiji Watanabe wrote:
> This patch adds id_reg_info for ID_DFR1_EL1 to make it writable
> by userspace.
>
> Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
> ---
> arch/arm64/kvm/sys_regs.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index fbd335ac5e6b..dda7001959f6 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -859,6 +859,11 @@ static struct id_reg_info id_dfr0_el1_info = {
> .get_reset_val = get_reset_id_dfr0_el1,
> };
>
> +static struct id_reg_info id_dfr1_el1_info = {
> + .sys_reg = SYS_ID_DFR1_EL1,
> + .ftr_check_types = S_FCT(ID_DFR1_MTPMU_SHIFT, FCT_LOWER_SAFE),
what about the 0xF value which indicates the MTPMU is not implemented?
Eric
> +};
> +
> /*
> * An ID register that needs special handling to control the value for the
> * guest must have its own id_reg_info in id_reg_info_table.
> @@ -869,6 +874,7 @@ static struct id_reg_info id_dfr0_el1_info = {
> #define GET_ID_REG_INFO(id) (id_reg_info_table[IDREG_IDX(id)])
> static struct id_reg_info *id_reg_info_table[KVM_ARM_ID_REG_MAX_NUM] = {
> [IDREG_IDX(SYS_ID_DFR0_EL1)] = &id_dfr0_el1_info,
> + [IDREG_IDX(SYS_ID_DFR1_EL1)] = &id_dfr1_el1_info,
> [IDREG_IDX(SYS_ID_AA64PFR0_EL1)] = &id_aa64pfr0_el1_info,
> [IDREG_IDX(SYS_ID_AA64PFR1_EL1)] = &id_aa64pfr1_el1_info,
> [IDREG_IDX(SYS_ID_AA64DFR0_EL1)] = &id_aa64dfr0_el1_info,
>
