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Re: [RFC XEN PATCH v2] x86/cpuid: Expose max_vcpus field in HVM hypervisor leaf
- To: Matthew Barnes <matthew.barnes@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Jul 2024 13:37:11 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 22 Jul 2024 11:37:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.07.2024 16:21, Matthew Barnes wrote:
> Currently, OVMF is hard-coded to set up a maximum of 64 vCPUs on
> startup.
>
> There are efforts to support a maximum of 128 vCPUs, which would involve
> bumping the OVMF constant from 64 to 128.
>
> However, it would be more future-proof for OVMF to access the maximum
> number of vCPUs for a domain and set itself up appropriately at
> run-time.
>
> GitLab ticket: https://gitlab.com/xen-project/xen/-/issues/191
>
> For OVMF to access the maximum vCPU count, this patch has Xen expose
> the maximum vCPU ID via cpuid on the HVM hypervisor leaf in edx.
>
> Signed-off-by: Matthew Barnes <matthew.barnes@xxxxxxxxx>
> ---
> Changes in v2:
> - Tweak value from "maximum vcpu count" to "maximum vcpu id"
> - Reword commit message to avoid "have to" wording
> - Fix vpcus -> vcpus typo
> ---
Yet still HVM-only?
Jan
|
