x86/tsc: Init the TSC for Secure TSC guests

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Use the GUEST_TSC_FREQ MSR to discover the TSC frequency instead of
relying on kvm-clock based frequency calibration.  Override both CPU and
TSC frequency calibration callbacks with securetsc_get_tsc_khz(). Since
the difference between CPU base and TSC frequency does not apply in this
case, the same callback is being used.

  [ bp: Carve out from
    https://lore.kernel.org/r/20250106124633.1418972-11-nikunj@amd.com ]

Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250106124633.1418972-11-nikunj@amd.com

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Nikunj A Dadhania 2025-01-06 18:16:30 +05:30 • committed by Borislav Petkov (AMD)

parent 0a2a98f691

commit 73bbf3b0fb

3 changed files with 27 additions and 0 deletions

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21

arch/x86/coco/sev/core.c

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2

arch/x86/include/asm/sev.h

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4

arch/x86/kernel/tsc.c

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