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Re: [PATCH] x86/vcpu: relax VCPUOP_initialise restriction for non-PV vCPUs
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 25 Mar 2024 11:17:14 +0100
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 25 Mar 2024 10:17:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.pau@xxxxxxxxxx>
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
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