Re: [Qemu-devel] [PATCH for-4.2 07/24] target/arm: Enable HCR_E2H for VHE

["Alex Bennée" <alex.bennee@linaro.org>]

Richard Henderson <richard.henderson@linaro.org> writes:

> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

> ---
>  target/arm/cpu.h    | 7 -------
>  target/arm/helper.c | 6 +++++-
>  2 files changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/target/arm/cpu.h b/target/arm/cpu.h
> index e6a76d14c6..e37008a4f7 100644
> --- a/target/arm/cpu.h
> +++ b/target/arm/cpu.h
> @@ -1366,13 +1366,6 @@ static inline void xpsr_write(CPUARMState *env, uint32_t val, uint32_t mask)
>  #define HCR_ATA       (1ULL << 56)
>  #define HCR_DCT       (1ULL << 57)
>
> -/*
> - * When we actually implement ARMv8.1-VHE we should add HCR_E2H to
> - * HCR_MASK and then clear it again if the feature bit is not set in
> - * hcr_write().
> - */
> -#define HCR_MASK      ((1ULL << 34) - 1)
> -
>  #define SCR_NS                (1U << 0)
>  #define SCR_IRQ               (1U << 1)
>  #define SCR_FIQ               (1U << 2)
> diff --git a/target/arm/helper.c b/target/arm/helper.c
> index 3a9f35bf4b..0a55096770 100644
> --- a/target/arm/helper.c
> +++ b/target/arm/helper.c
> @@ -4623,7 +4623,8 @@ static const ARMCPRegInfo el3_no_el2_v8_cp_reginfo[] = {
>  static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
>  {
>      ARMCPU *cpu = env_archcpu(env);
> -    uint64_t valid_mask = HCR_MASK;
> +    /* Begin with bits defined in base ARMv8.0.  */
> +    uint64_t valid_mask = MAKE_64BIT_MASK(0, 34);
>
>      if (arm_feature(env, ARM_FEATURE_EL3)) {
>          valid_mask &= ~HCR_HCD;
> @@ -4637,6 +4638,9 @@ static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
>           */
>          valid_mask &= ~HCR_TSC;
>      }
> +    if (cpu_isar_feature(aa64_vh, cpu)) {
> +        valid_mask |= HCR_E2H;
> +    }
>      if (cpu_isar_feature(aa64_lor, cpu)) {
>          valid_mask |= HCR_TLOR;
>      }


--
Alex Bennée