Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs

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To: "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>, "Gao, Chao" <chao.gao@xxxxxxxxx>
Subject: Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
From: Xin Li <xin@xxxxxxxxx>
Date: Sun, 27 Apr 2025 22:51:31 -0700
Cc: "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "ebiggers@xxxxxxxxxx" <ebiggers@xxxxxxxxxx>, "Hansen, Dave" <dave.hansen@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, "Spassov, Stanislav" <stanspas@xxxxxxxxx>, "levymitchell0@xxxxxxxxx" <levymitchell0@xxxxxxxxx>, "samuel.holland@xxxxxxxxxx" <samuel.holland@xxxxxxxxxx>, "Li, Xin3" <xin3.li@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "Yang, Weijiang" <weijiang.yang@xxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "pbonzini@xxxxxxxxxx" <pbonzini@xxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "john.allen@xxxxxxx" <john.allen@xxxxxxx>, "mlevitsk@xxxxxxxxxx" <mlevitsk@xxxxxxxxxx>, "seanjc@xxxxxxxxxx" <seanjc@xxxxxxxxxx>, "Bae, Chang Seok" <chang.seok.bae@xxxxxxxxx>, "vigbalas@xxxxxxx" <vigbalas@xxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "aruna.ramakrishna@xxxxxxxxxx" <aruna.ramakrishna@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>
In-reply-to: <4a4b1f18d585c7799e5262453e4cfa2cf47c3175.camel@intel.com>
References: <20250410072605.2358393-1-chao.gao@intel.com> <20250410072605.2358393-4-chao.gao@intel.com> <f53bea9b13bd8351dc9bba5e443d5e4f4934555d.camel@intel.com> <aAtG13wd35yMNahd@intel.com> <4a4b1f18d585c7799e5262453e4cfa2cf47c3175.camel@intel.com>
User-agent: Mozilla Thunderbird

On 4/25/2025 9:09 AM, Edgecombe, Rick P wrote:

   And that will create a bit of a
  :snafu if Linux does gain support for SSS.

*:https://lore.kernel.org/kvm/ZM1jV3UPL0AMpVDI@xxxxxxxxxx/

I chatted with Xin about this a few weeks ago. It sounds like FRED bare metal
SSS will not need CET_S state, but it wasn't 100% clear.


FRED reuses one CET_S MSR IA32_PL0_SSP, and give it an alias
IA32_FRED_SSP0.

Thanks!
    Xin

Follow-Ups:
- Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
  - From: Xin Li

References:
- [PATCH v5 0/7] Introduce CET supervisor state support
  - From: Chao Gao
- [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
  - From: Chao Gao
- Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
  - From: Edgecombe, Rick P
- Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
  - From: Chao Gao
- Re: [PATCH v5 3/7] x86/fpu/xstate: Differentiate default features for host and guest FPUs
  - From: Edgecombe, Rick P

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