linux-kernel - Re: [PATCH 1/4] x86/coco: Add a new CC attribute to unify cache flush during kexec

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Message-ID: <1511b773-5f79-4882-9566-e0db8d8f53b3@intel.com>
Date: Thu, 29 Feb 2024 11:21:36 +1300
From: "Huang, Kai" <kai.huang@...el.com>
To: Borislav Petkov <bp@...en8.de>
CC: "dyoung@...hat.com" <dyoung@...hat.com>, "Gao, Chao" <chao.gao@...el.com>,
	"luto@...nel.org" <luto@...nel.org>, "Hansen, Dave" <dave.hansen@...el.com>,
	"x86@...nel.org" <x86@...nel.org>, "bhe@...hat.com" <bhe@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "hpa@...or.com"
	<hpa@...or.com>, "mingo@...hat.com" <mingo@...hat.com>,
	"thomas.lendacky@....com" <thomas.lendacky@....com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "nik.borisov@...e.com"
	<nik.borisov@...e.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH 1/4] x86/coco: Add a new CC attribute to unify cache flush
 during kexec



On 29/02/2024 12:02 am, Borislav Petkov wrote:
> On Wed, Feb 28, 2024 at 09:21:00AM +0000, Huang, Kai wrote:
>> Based on this I'll change to do unconditional WBINVD during kexec() for in
>> stop_this_cpu() and relocate_kernel().  Please let me know if you have any
>> comments.
> 
> Yes, pls make sure to summarize in the commit message what this thread
> figured out. But basically, we want to try the simple approach and
> WBINVD unconditionally on the CPU stopping path so that caches are clean
> and there's no potential issues...
> 

Yes will do.  Thanks for the feedback.