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i386: Document when features can be added to kvm_default_props

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It's very easy to mistakenly extend kvm_default_props to include
features that require a kernel version that's too recent.  Add a
comment warning about that, pointing to the documentation file
where the minimum kernel version for KVM is documented.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200925211021.4158567-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2020-09-25 17:10:21 -04:00
parent 7bde6b1857
commit fd1fd38b86
1 changed files with 5 additions and 0 deletions
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5
target/i386/kvm/kvm-cpu.c
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@ -47,6 +47,11 @@ static bool kvm_cpu_realizefn(CPUState *cs, Error **errp)
/*
* KVM-specific features that are automatically added/removed
* from all CPU models when KVM is enabled.
*
* NOTE: features can be enabled by default only if they were
* already available in the oldest kernel version supported
* by the KVM accelerator (see "OS requirements" section at
* docs/system/target-i386.rst)
*/
static PropValue kvm_default_props[] = {
{ "kvmclock", "on" },