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From: Dan Williams <dan.j.williams@intel.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Vishal L Verma <vishal.l.verma@intel.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-efi <linux-efi@vger.kernel.org>
Subject: Re: [PATCH v5 05/10] x86, efi: Add efi_fake_mem support for EFI_MEMORY_SP
Date: Fri, 13 Sep 2019 08:02:26 -0700
Message-ID: <CAPcyv4jv8OacA-P+DFj_d9gq3P-7b9xcr4=m3kx7nTvyko6i2g@mail.gmail.com> (raw)
In-Reply-To: <CAKv+Gu-UK75nCreZb=v7PQne4Ay25B7oRAeRg4AB1XopYXt3Cg@mail.gmail.com>

On Fri, Sep 13, 2019 at 6:02 AM Ard Biesheuvel
<ard.biesheuvel@linaro.org> wrote:
>
> On Fri, 30 Aug 2019 at 03:07, Dan Williams <dan.j.williams@intel.com> wrote:
> >
> > Given that EFI_MEMORY_SP is platform BIOS policy descision for marking
>
> decision

Fixed.

>
> > memory ranges as "reserved for a specific purpose" there will inevitably
> > be scenarios where the BIOS omits the attribute in situations where it
> > is desired. Unlike other attributes if the OS wants to reserve this
> > memory from the kernel the reservation needs to happen early in init. So
> > early, in fact, that it needs to happen before e820__memblock_setup()
> > which is a pre-requisite for efi_fake_memmap() that wants to allocate
> > memory for the updated table.
> >
> > Introduce an x86 specific efi_fake_memmap_early() that can search for
> > attempts to set EFI_MEMORY_SP via efi_fake_mem and update the e820 table
> > accordingly.
> >
>
> Is this early enough? The EFI stub runs before this, and allocates
> memory as well.

Unless I'm missing something the stub only allocates where the kernel
will land. That should be handled by the new mem_avoid_memmap()
extensions to consider "efi_fake_mem" in its exclusions.

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-30  1:52 [PATCH v5 00/10] EFI Specific Purpose Memory Support Dan Williams
2019-08-30  1:52 ` [PATCH v5 01/10] acpi/numa: Establish a new drivers/acpi/numa/ directory Dan Williams
2019-08-30  1:52 ` [PATCH v5 02/10] efi: Enumerate EFI_MEMORY_SP Dan Williams
2019-08-30  1:52 ` [PATCH v5 03/10] x86, efi: Push EFI_MEMMAP check into leaf routines Dan Williams
2019-09-13  9:05   ` Ard Biesheuvel
2019-09-13 12:32     ` Dan Williams
2019-08-30  1:52 ` [PATCH v5 04/10] x86, efi: Reserve UEFI 2.8 Specific Purpose Memory for dax Dan Williams
2019-09-13 12:59   ` Ard Biesheuvel
2019-09-13 16:22     ` Dan Williams
2019-09-13 16:28       ` Ard Biesheuvel
2019-09-13 16:39         ` Dan Williams
2019-09-13 17:39           ` Ard Biesheuvel
2019-09-13 17:54             ` Ard Biesheuvel
2019-08-30  1:52 ` [PATCH v5 05/10] x86, efi: Add efi_fake_mem support for EFI_MEMORY_SP Dan Williams
2019-09-10  6:48   ` Ingo Molnar
2019-09-13 13:02   ` Ard Biesheuvel
2019-09-13 15:02     ` Dan Williams [this message]
2019-09-13 19:48   ` Ard Biesheuvel
2019-09-13 20:43     ` Dan Williams
2019-08-30  1:52 ` [PATCH v5 06/10] lib: Uplevel the pmem "region" ida to a global allocator Dan Williams
2019-08-30  1:52 ` [PATCH v5 07/10] dax: Fix alloc_dax_region() compile warning Dan Williams
2019-08-30  1:53 ` [PATCH v5 08/10] device-dax: Add a driver for "hmem" devices Dan Williams
2019-08-30  1:53 ` [PATCH v5 09/10] acpi/numa/hmat: Register HMAT at device_initcall level Dan Williams
2019-08-30  1:53 ` [PATCH v5 10/10] acpi/numa/hmat: Register "soft reserved" memory as an "hmem" device Dan Williams
2019-09-02 11:09 ` [PATCH v5 00/10] EFI Specific Purpose Memory Support Rafael J. Wysocki
2019-09-04 23:06   ` Dan Williams
2019-09-06 11:37     ` Rafael J. Wysocki

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