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From: "Gupta, Pankaj" <pankaj.gupta@amd.com>
To: Ard Biesheuvel <ardb@kernel.org>,
	Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org
Cc: "H . Peter Anvin" <hpa@zytor.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	"Kiryl Shutsemau (Meta)" <kas@kernel.org>,
	linux-kernel@vger.kernel.org, Mike Rapoport <rppt@kernel.org>,
	linux-mm@kvack.org
Subject: Re: [PATCH] x86/unaccepted_memory: Do not accept ranges that are no longer E820 RAM
Date: Mon, 2 Nov 2026 13:01:52 +0100	[thread overview]
Message-ID: <f241f883-39f2-408b-9f44-574ce8d2910a@amd.com> (raw)
In-Reply-To: <a9fb9818-39fd-4b6e-8998-761bc3439893@amd.com>

>>>
>> Can we just disallow memmap= when running in a confidential VM?
>
> My experiments showed: memmap itself don't have a problem but memap 
> with a hole is causing crash.
>
> There might be some usecases which are already using this, e.g:
>
> https://lore.kernel.org/all/20261029-cma-multi-v1-0-2cbced8b5cb7@kernel.org/ 
>
>
Its also good to have a general safeguard to not accept memory that is 
not marked as RAM in e820?

Thanks,

Pankaj


  reply	other threads:[~2026-11-02 12:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-02 11:31 Pankaj Gupta
2026-11-02 11:41 ` Ard Biesheuvel
2026-11-02 11:51   ` Gupta, Pankaj
2026-11-02 12:01     ` Gupta, Pankaj [this message]
2026-11-02 12:11       ` Ard Biesheuvel

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