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Documentation: KVM: KVM_GET_SUPPORTED_CPUID now exposes TSC_DEADLINE

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TSC_DEADLINE is now advertised unconditionally by KVM_GET_SUPPORTED_CPUID,
since commit 9be4ec35d6 ("KVM: x86: Advertise TSC_DEADLINE_TIMER in
KVM_GET_SUPPORTED_CPUID", 2024-12-18).  Adjust the documentation to
reflect the new behavior.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250331150550.510320-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2025-03-31 17:05:50 +02:00
parent c57047f6f3
commit f3e555ba45
1 changed files with 4 additions and 3 deletions
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7
Documentation/virt/kvm/api.rst
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@@ -9076,9 +9076,10 @@ the local APIC.
The same is true for the ``KVM_FEATURE_PV_UNHALT`` paravirtualized feature.
CPU[EAX=1]:ECX[24] (TSC_DEADLINE) is not reported by ``KVM_GET_SUPPORTED_CPUID``.
It can be enabled if ``KVM_CAP_TSC_DEADLINE_TIMER`` is present and the kernel
has enabled in-kernel emulation of the local APIC.
On older versions of Linux, CPU[EAX=1]:ECX[24] (TSC_DEADLINE) is not reported by
``KVM_GET_SUPPORTED_CPUID``, but it can be enabled if ``KVM_CAP_TSC_DEADLINE_TIMER``
is present and the kernel has enabled in-kernel emulation of the local APIC.
On newer versions, ``KVM_GET_SUPPORTED_CPUID`` does report the bit as available.
CPU topology
~~~~~~~~~~~~