KVM: x86/xen: update Xen CPUID Leaf 4 (tsc info) sub-leaves, if present

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The scaling information in subleaf 1 should match the values set by KVM in
the 'vcpu_info' sub-structure 'time_info' (a.k.a. pvclock_vcpu_time_info)
which is shared with the guest, but is not directly available to the VMM.
The offset values are not set since a TSC offset is already applied.
The TSC frequency should also be set in sub-leaf 2.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lore.kernel.org/r/20230106103600.528-3-pdurrant@amazon.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Paul Durrant 2023-01-06 10:36:00 +00:00 • committed by Sean Christopherson

parent 48639df8a9

commit f422f853af

6 changed files with 40 additions and 1 deletions

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1

arch/x86/include/asm/kvm_host.h

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4

arch/x86/include/asm/xen/hypervisor.h

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arch/x86/kvm/cpuid.c

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arch/x86/kvm/x86.c

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arch/x86/kvm/xen.c

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arch/x86/kvm/xen.h

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