KVM: X86: Add functions that calculate the nested TSC fields

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When L2 is entered we need to "merge" the TSC multiplier and TSC offset
values of 01 and 12 together.

The merging is done using the following equations:
  offset_02 = ((offset_01 * mult_12) >> shift_bits) + offset_12
  mult_02 = (mult_01 * mult_12) >> shift_bits

Where shift_bits is kvm_tsc_scaling_ratio_frac_bits.

Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210526184418.28881-8-ilstam@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Ilias Stamatis 2021-05-26 19:44:14 +01:00 • committed by Paolo Bonzini

parent 307a94c721

commit 83150f2932

2 changed files with 27 additions and 0 deletions

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arch/x86/include/asm/kvm_host.h

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25

arch/x86/kvm/x86.c

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