linux-kernel - RE: [PATCH 0/2] x86/kvm: Force legacy PCI hole as WB under SNP/TDX

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Message-ID: <PH0PR11MB50641EB8CA3EA442FF2A0ABFC5F72@PH0PR11MB5064.namprd11.prod.outlook.com>
Date: Wed, 5 Feb 2025 07:49:45 +0000
From: "Xu, Min M" <min.m.xu@...el.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, "seanjc@...gle.com"
	<seanjc@...gle.com>, "Wu, Binbin" <binbin.wu@...el.com>
CC: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "thomas.lendacky@....com"
	<thomas.lendacky@....com>, "dionnaglaze@...gle.com" <dionnaglaze@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
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	"x86@...nel.org" <x86@...nel.org>, "pgonda@...gle.com" <pgonda@...gle.com>,
	"Xu, Min M" <min.m.xu@...el.com>, "Yao, Jiewen" <jiewen.yao@...el.com>
Subject: RE: [PATCH 0/2] x86/kvm: Force legacy PCI hole as WB under SNP/TDX

On Wednesday, February 5, 2025 11:51 AM, Edgecombe, Rick P wrote:
> 
> +Min, can you comment?
> 
> 3a3b12cbda ("UefiCpuPkg/MtrrLib: MtrrLibIsMtrrSupported always return FALSE
> in
> TD-Guest") turned out to be problematic in practice.
> 
As the commit(3a3b12cbda) message mentioned that "For Linux kernel, there is a mechanism called SW defined MTRR introduced  by the patch https://lore.kernel.org/all/20230502120931.20719-4-jgross@suse.com/". 
From the discussion in below thread it seems the patch (SW defined MTR in kernel) has not been introduced into kernel master branch, right?
We need some time to investigate it and will give an update here. 
> Full thread:
> https://lore.kernel.org/kvm/20250201005048.657470-1-seanjc@google.com/
> 

Thanks
Min