linux-kernel - Re: [PATCH v2 2/6] x86/fpu/xstate: Add CET supervisor mode state support

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Message-ID: <866757ec-3a05-4360-b35d-5ab8e66ab6c5@intel.com>
Date: Tue, 4 Mar 2025 14:26:01 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Chao Gao <chao.gao@...el.com>, tglx@...utronix.de, x86@...nel.org,
 seanjc@...gle.com, pbonzini@...hat.com, linux-kernel@...r.kernel.org,
 kvm@...r.kernel.org
Cc: peterz@...radead.org, rick.p.edgecombe@...el.com, mlevitsk@...hat.com,
 weijiang.yang@...el.com, john.allen@....com
Subject: Re: [PATCH v2 2/6] x86/fpu/xstate: Add CET supervisor mode state
 support

On 11/26/24 02:17, Chao Gao wrote:
...
> The alternative is to enable it in KVM domain, but KVM maintainers NAKed
> the solution. The external discussion can be found at [*], it ended up
> with adding the support in kernel instead of KVM domain.
So, there's a lot of changelog here, but scant details.

This patch enables XFEATURE_CET_KERNEL everywhere it's available, right?
So, this patch at least wastes the XSAVE buffer space and doesn't
actually get anything. Right?