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Subject: Re: [PATCH V4 0/2] Add support for arm64 to carry ima measurement
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From: prsriva <prsriva@linux.microsoft.com>
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Date: Mon, 21 Oct 2019 10:38:44 -0700
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To: Pavel Tatashin <pasha.tatashin@soleen.com>, James Morse <james.morse@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>, jean-philippe@linaro.org, arnd@arndb.de, Ard Biesheuvel <ard.biesheuvel@linaro.org>, sboyd@kernel.org, Catalin Marinas <catalin.marinas@arm.com>, takahiro.akashi@linaro.org, kexec mailing list <kexec@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>, zohar@linux.ibm.com, Masahiro Yamada <yamada.masahiro@socionext.com>, duwe@lst.de, allison@lohutok.net, linux-integrity@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, bauerman@linux.ibm.com, Linux ARM <linux-arm-kernel@lists.infradead.org>


On 10/15/19 11:47 AM, Pavel Tatashin wrote:
>> I think the UEFI persistent-memory-reservations thing is a better fit for this [0][1].
> 
> Hi James,
> 
> Thank you for your thought. As I understand you propose the to use the
> existing method as such:
> 1. Use the existing kexec ABI to pass reservation from kernel to
> kernel using EFI the same as is done for GICv3 tables.
> 2. Allow this memory to be reservable only during first Linux boot via
> EFI memory reserve
> 3. Allow to have this memory pre-reserved by firmware or to be
> embedded into device tree.
> 
> A question I have is how to tell that a reserved region is reserved
> for IMA use. With GICv3 it is done by reading the registers, finding
> the interrupt tables memory, and check that the memory ranges are
> indeed pre-reserved.
> 
> Is there a way to name memory with the current ABI that you think is acceptable?
> 
> Thank you,
> Pasha
> 
Friendly ping.

Thanks,
Prakhar Srivastava


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