linux-kernel - Re: [PATCH v2 00/25] TDX vCPU/VM creation

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Message-ID: <d0cf8fb2-9cff-40d0-8ffb-5d0ba9c86539@intel.com>
Date: Thu, 31 Oct 2024 21:21:29 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>, pbonzini@...hat.com,
 seanjc@...gle.com
Cc: yan.y.zhao@...el.com, isaku.yamahata@...il.com, kai.huang@...el.com,
 kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 tony.lindgren@...ux.intel.com, xiaoyao.li@...el.com,
 reinette.chatre@...el.com
Subject: Re: [PATCH v2 00/25] TDX vCPU/VM creation

On 30/10/24 21:00, Rick Edgecombe wrote:
> Here is v2 of TDX VM/vCPU creation series. As discussed earlier, non-nits 
> from v1[0] have been applied and it’s ready to hand off to Paolo. A few 
> items remain that may be worth further discussion:
>  - Disable CET/PT in tdx_get_supported_xfam(), as these features haven’t 
>    been been tested.

It seems for Intel PT we have no support for restoring host
state.  IA32_RTIT_* MSR preservation is Init(XFAM(8)) which means
the TDX Module sets the MSR to its RESET value after TD Enty/Exit.
So it seems to me XFAM(8) does need to be disabled until that is
supported.