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KVM: arm64: Fix the KVM_ARM_PREFERRED_TARGET documentation

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KVM_ARM_PREFERRED_TARGET has never set a feature bit: the original arm64
implementation zeroed the bitmap, and kvm_vcpu_preferred_target(), which
only ever zeroed it, was removed by commit 5346f7e13e ("KVM: arm64:
Always return generic v8 as the preferred target"). The ENODEV error had
gone earlier still, with commit 08e873cb70 ("KVM: arm64: Change the
return type of kvm_vcpu_preferred_target()"). Document what it returns,
that userspace selects vCPU features itself, and drop the error.

No functional change intended.

Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Wei-Lin Chang <weilin.chang@arm.com>
Link: https://patch.msgid.link/20260831162815.269851-1-fuad.tabba@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Fuad Tabba 2026-08-31 17:28:15 +01:00 committed by Marc Zyngier
parent 068df88a7d
commit f3435cb7df
1 changed files with 5 additions and 11 deletions
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16
Documentation/virt/kvm/api.rst
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@ -3600,20 +3600,14 @@ Possible features:
:Parameters: struct kvm_vcpu_init (out)
:Returns: 0 on success; -1 on error
Errors:
====== ==========================================
ENODEV no preferred target available for the host
====== ==========================================
This queries KVM for preferred CPU target type which can be emulated
by KVM on underlying host.
The ioctl returns struct kvm_vcpu_init instance containing information
about preferred CPU target type and recommended features for it. The
kvm_vcpu_init->features bitmap returned will have feature bits set if
the preferred target recommends setting these features, but this is
not mandatory.
The ioctl returns a struct kvm_vcpu_init instance containing the
preferred CPU target type. The kvm_vcpu_init->features bitmap is
returned empty: userspace selects the vCPU features itself, and their
availability is reported by the capabilities listed under
KVM_ARM_VCPU_INIT.
The information returned by this ioctl can be used to prepare an instance
of struct kvm_vcpu_init for KVM_ARM_VCPU_INIT ioctl which will result in