linux-kernel - Re: [PATCHv2 2/2] x86/mm: Make memremap(MEMREMAP

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Message-ID: <frry56jwxk6cpesuk4u5mcnkaxq3c4xqhdi52irdvabwtn5smt@t2tudprmocs4>
Date: Mon, 13 Jan 2025 14:22:29 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Borislav Petkov <bp@...en8.de>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
	Andy Lutomirski <luto@...nel.org>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexei Starovoitov <ast@...nel.org>, Andrea Parri <parri.andrea@...il.com>, 
	Arnd Bergmann <arnd@...db.de>, Daniel Borkmann <daniel@...earbox.net>, 
	Eric Chan <ericchancf@...gle.com>, Jason Gunthorpe <jgg@...pe.ca>, Kai Huang <kai.huang@...el.com>, 
	Kefeng Wang <wangkefeng.wang@...wei.com>, Kent Overstreet <kent.overstreet@...ux.dev>, 
	Palmer Dabbelt <palmer@...osinc.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Russell King <linux@...linux.org.uk>, Samuel Holland <samuel.holland@...ive.com>, 
	Suren Baghdasaryan <surenb@...gle.com>, Yuntao Wang <ytcoode@...il.com>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Tom Lendacky <thomas.lendacky@....com>, Ashish Kalra <ashish.kalra@....com>, 
	"Maciej W. Rozycki" <macro@...am.me.uk>
Subject: Re: [PATCHv2 2/2] x86/mm: Make memremap(MEMREMAP_WB) map memory as
 encrypted by defaultk

On Mon, Jan 13, 2025 at 11:32:38AM +0100, Borislav Petkov wrote:
> On Mon, Jan 13, 2025 at 12:03:22PM +0200, Kirill A. Shutemov wrote:
> > Borislav,
> > 
> > Is there anything I need to do to get this patchset merged?
> 
> Your updated commit message here:
> 
> https://lore.kernel.org/r/bz3vlh3lri7yfckdkddopwhsgvkmizhw5q6ecomgeba7q22ufp@ntu2kugiho4o
> 
> Reads better, yes.
> 
> > This change fixes the crash on kexec in TDX guests if CONFIG_EISA is
> > enabled.
> 
> s/This change fixes/Fix/
> 
> In imperative tone pls.

Okay.

> And that sentence begs the question: does this need to go to stable?

Right.

It is hard to pin down Fixes commit as the bug is inherited from initial
encrypted/decrypted handling implementation, but it is not useful to
backport it all the way.

I'll add

Cc: stable@...r.kernel.org # 6.11+

6.11 is where kexec handling for TDX was introduced.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov