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Re: [PATCH 01/16] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15
- To: Sean Christopherson <seanjc@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, <x86@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, "Alexey Makhalov" <alexey.amakhalov@xxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, "Andy Lutomirski" <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- From: Nikunj A Dadhania <nikunj@xxxxxxx>
- Date: Mon, 3 Feb 2025 05:55:02 +0000
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- Cc: <linux-kernel@xxxxxxxxxxxxxxx>, <linux-coco@xxxxxxxxxxxxxxx>, <virtualization@xxxxxxxxxxxxxxx>, <linux-hyperv@xxxxxxxxxxxxxxx>, <jailhouse-dev@xxxxxxxxxxxxxxxx>, <kvm@xxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>
- Delivery-date: Mon, 03 Feb 2025 06:34:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Sean Christopherson <seanjc@xxxxxxxxxx> writes:
> Extract retrieval of TSC frequency information from CPUID into standalone
> helpers so that TDX guest support and kvmlock can reuse the logic. Provide
s/kvmlock/kvmclock
> a version that includes the multiplier math as TDX in particular does NOT
> want to use native_calibrate_tsc()'s fallback logic that derives the TSC
> frequency based on CPUID.0x16 when the core crystal frequency isn't known.
>
> No functional change intended.
>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> ---
...
> +
> +static inline int cpuid_get_tsc_freq(unsigned int *tsc_khz,
> + unsigned int *crystal_khz)
Should we add this in patch 6/16 where it is being used for the first time ?
Regards
Nikunj
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