On Fri, 2026-05-15 at 12:19 -0700, Sean Christopherson wrote:
> Mark the TSC frequency as known when using ACRN's PV CPUID information.
> Per commit 81a71f51b89e ("x86/acrn: Set up timekeeping") and common sense,
> the TSC freq is explicitly provided by the hypervisor.
>
> Signed-off-by: Sean Christopherson <[email protected]>
> ---
> arch/x86/kernel/cpu/acrn.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
> index c1506cb87d8c..2da3de4d470e 100644
> --- a/arch/x86/kernel/cpu/acrn.c
> +++ b/arch/x86/kernel/cpu/acrn.c
> @@ -29,6 +29,7 @@ static void __init acrn_init_platform(void)
> /* Install system interrupt handler for ACRN hypervisor callback */
> sysvec_install(HYPERVISOR_CALLBACK_VECTOR, sysvec_acrn_hv_callback);
>
> + setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
> tsc_register_calibration_routines(acrn_get_tsc_khz,
> acrn_get_tsc_khz);I'd feel slightly happier doing that from within acrn_get_tsc_khz() itself.... which I note is 'static inline'. I'm vaguely surprised that even builds (although it does). Probably nicer to move it explicitly out of line in acrn.c though. Most of that should be a comment on patch 2 of the series, I guess?
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