From f3e555ba45da361f5286b35921c7ca8afbef6384 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 31 Mar 2025 17:05:50 +0200 Subject: [PATCH] Documentation: KVM: KVM_GET_SUPPORTED_CPUID now exposes TSC_DEADLINE TSC_DEADLINE is now advertised unconditionally by KVM_GET_SUPPORTED_CPUID, since commit 9be4ec35d668 ("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 Reviewed-by: Sean Christopherson Message-ID: <20250331150550.510320-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini --- Documentation/virt/kvm/api.rst | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 1f8625b7646a..0ec40765ccd4 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -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 ~~~~~~~~~~~~