Re: [PATCH v6 7/9] x86/vmscape: Deploy BHB clearing mitigation

[Nikolay Borisov]

On 2.12.25 г. 8:20 ч., Pawan Gupta wrote:
> IBPB mitigation for VMSCAPE is an overkill on CPUs that are only affected
> by the BHI variant of VMSCAPE. On such CPUs, eIBRS already provides
> indirect branch isolation between guest and host userspace. However, branch
> history from guest may also influence the indirect branches in host
> userspace.
>
> To mitigate the BHI aspect, use clear_bhb_loop().
>
> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>

Reviewed-by: Nikolay Borisov <nik.borisov@xxxxxxxx>