On 20.03.2024 14:57, Roger Pau Monne wrote:
> There's no reason to force HVM guests to have a valid vcpu_info area when
> initializing a vCPU, as the vCPU can also be brought online using the local
> APIC, and on that path there's no requirement for vcpu_info to be setup ahead
> of the bring up. Note an HVM vCPU can operate normally without making use of
> vcpu_info.
>
> Restrict the check against dummy_vcpu_info to only apply to PV guests.
>
> Fixes: 192df6f9122d ('x86: allow HVM guests to use hypercalls to bring up
> vCPUs')
> Signed-off-by: Roger Pau Monné <roger....@citrix.com>
Despite the Fixes: tag I have to admit I'm uncertain of backporting here.
HVM guests need to be prepared anyway that they may be denied use of this
sub-op without first setting up vCPU info.
Jan
