Re: [PATCH v7 RESEND 1/5] hw/core/machine: Reject thread level cache

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 10/1/25 15:51, Zhao Liu wrote:
> Currently, neither i386 nor ARM have real hardware support for per-
> thread cache, and there is no clear demand for this specific cache
> topology.
> 
> Additionally, since ARM even can't support this special cache topology
> in device tree, it is unnecessary to support it at this moment, even
> though per-thread cache might have potential scheduling benefits for
> VMs without CPU affinity.
> 
> Therefore, disable thread-level cache topology in the general machine
> part. At present, i386 has not enabled SMP cache, so disabling the
> thread parameter does not pose compatibility issues.
> 
> In the future, if there is a clear demand for this feature, the correct
> approach would be to add a new control field in MachineClass.smp_props
> and enable it only for the machines that require it.
> 
> Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
> ---
> Changes since Patch v6:
>   * New commit to reject "thread" parameter when parse smp-cache.
> ---
>   hw/core/machine-smp.c | 7 +++++++
>   1 file changed, 7 insertions(+)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>