linux-kernel - Re: [PATCH v7 1/3] efi/x86: Fix EFI memory map corruption with kexec

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Message-ID: <2343889c-887a-49ce-86df-343737d70d37@amd.com>
Date: Mon, 3 Jun 2024 12:08:48 -0500
From: "Kalra, Ashish" <ashish.kalra@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: Mike Rapoport <rppt@...nel.org>, tglx@...utronix.de, mingo@...hat.com,
 dave.hansen@...ux.intel.com, x86@...nel.org, rafael@...nel.org,
 hpa@...or.com, peterz@...radead.org, adrian.hunter@...el.com,
 sathyanarayanan.kuppuswamy@...ux.intel.com, jun.nakajima@...el.com,
 rick.p.edgecombe@...el.com, thomas.lendacky@....com, michael.roth@....com,
 seanjc@...gle.com, kai.huang@...el.com, bhe@...hat.com,
 kirill.shutemov@...ux.intel.com, bdas@...hat.com, vkuznets@...hat.com,
 dionnaglaze@...gle.com, anisinha@...hat.com, jroedel@...e.de,
 ardb@...nel.org, kexec@...ts.infradead.org, linux-coco@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>
Subject: Re: [PATCH v7 1/3] efi/x86: Fix EFI memory map corruption with kexec

On 6/3/2024 11:57 AM, Borislav Petkov wrote:

> On Mon, Jun 03, 2024 at 11:48:03AM -0500, Kalra, Ashish wrote:
>> Yes, something similar as above, as efi_mem_reserve() is used to reserve
>> boot service memory and is not necessary for kexec boot.
>>
>> So, Dave Young (dyoung@...hat.com) had suggested that we skip
>> efi_arch_mem_reserve() for kexec by checking the set EFI_MEMORY_RUNTIME
>> attribute as below:a
> efi_arch_mem_reserve() or efi_mem_reserve() altogether?

efi_arch_mem_reserve().

Thanks, Ashish

>
> Btw, that below got really gibberished by your mail client. Snipped.
>