Re: [PATCH 04/12] hvf: arm: Ignore writes to CNTP_CTL_EL0

[Philippe Mathieu-Daudé]

On 15/6/23 00:54, Alexander Graf wrote:
> MacOS unconditionally disables interrupts of the physical timer on boot
> and then continues to use the virtual one. We don't really want to support
> a full physical timer emulation, so let's just ignore those writes.
>
> Signed-off-by: Alexander Graf <graf@amazon.com>
> ---
>   target/arm/hvf/hvf.c | 7 +++++++
>   1 file changed, 7 insertions(+)


> @@ -1551,6 +1552,12 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, 
> uint64_t val)
>       case SYSREG_OSLAR_EL1:
>           env->cp15.oslsr_el1 = val & 1;
>           break;
> +    case SYSREG_CNTP_CTL_EL0:
> +        /*
> +         * Guests should not rely on the physical counter, but macOS emits
> +         * disable writes to it. Let it do so, but ignore the requests.
> +         */

Still it could be useful to report that calling
qemu_log_mask(LOG_UNIMP,...) here.

> +        break;