| Message ID | 20250331150550.510320-1-pbonzini@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Documentation: KVM: KVM_GET_SUPPORTED_CPUID now exposes TSC_DEADLINE | expand |
On Mon, Mar 31, 2025, Paolo Bonzini wrote: > 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 <pbonzini@redhat.com> > --- Sorry, at one point I even had this on my todo list for that series. Reviewed-by: Sean Christopherson <seanjc@google.com>
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index d90ae23c0a40..732e07b44d48 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -9265,9 +9265,10 @@ 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 ~~~~~~~~~~~~
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 <pbonzini@redhat.com> --- Documentation/virt/kvm/api.rst | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)