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From: Sasha Levin <sashal@kernel.org>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	stable <stable@vger.kernel.org>,
	Jeremy Linton <jeremy.linton@arm.com>,
	linux-efi <linux-efi@vger.kernel.org>
Subject: Re: [PATCH AUTOSEL 4.19 133/191] efi: honour memory reservations passed via a linux specific config table
Date: Sun, 10 Nov 2019 08:27:26 -0500
Message-ID: <20191110132726.GN4787@sasha-vm> (raw)
In-Reply-To: <CAKv+Gu-PawCS_Wq3Hm+gm_f=6-ihXarkQqP9prkj4CLt=pAnvg@mail.gmail.com>

On Sun, Nov 10, 2019 at 08:33:47AM +0100, Ard Biesheuvel wrote:
>On Sun, 10 Nov 2019 at 03:44, Sasha Levin <sashal@kernel.org> wrote:
>>
>> From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>>
>> [ Upstream commit 71e0940d52e107748b270213a01d3b1546657d74 ]
>>
>> In order to allow the OS to reserve memory persistently across a
>> kexec, introduce a Linux-specific UEFI configuration table that
>> points to the head of a linked list in memory, allowing each kernel
>> to add list items describing memory regions that the next kernel
>> should treat as reserved.
>>
>> This is useful, e.g., for GICv3 based ARM systems that cannot disable
>> DMA access to the LPI tables, forcing them to reuse the same memory
>> region again after a kexec reboot.
>>
>> Tested-by: Jeremy Linton <jeremy.linton@arm.com>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>
>NAK
>
>This doesn't belong in -stable, and I'd be interested in understanding
>how this got autoselected, and how I can prevent this from happening
>again in the future.

It was selected because it's part of a fix for a real issue reported by
users:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806766

Besides ubuntu, it is also carried by:

SUSE: https://www.suse.com/support/update/announcement/2019/suse-su-20191530-1/
CentOS: https://koji.mbox.centos.org/koji/buildinfo?buildID=4558

As a way to resolve the reported bug.

Any reason this *shouldn't* be in stable? I'm aware that there might be
dependencies that are not obvious to me, but the solution here is to
take those dependencies as well rather than ignore the process
completely.

-- 
Thanks,
Sasha

  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20191110024013.29782-1-sashal@kernel.org>
2019-11-10  2:39 ` Sasha Levin
2019-11-10  7:33   ` Ard Biesheuvel
2019-11-10 13:27     ` Sasha Levin [this message]
2019-11-10 14:16       ` Ard Biesheuvel
2019-11-10 15:56         ` Sasha Levin
2019-11-10 16:26           ` Ard Biesheuvel
2019-11-10 18:08             ` Marc Zyngier
2019-11-10  2:39 ` [PATCH AUTOSEL 4.19 134/191] efi: Make efi_rts_work accessible to efi page fault handler Sasha Levin
2019-11-10  7:35   ` Ard Biesheuvel
2019-11-10  2:39 ` [PATCH AUTOSEL 4.19 135/191] efi/x86: Handle page faults occurring while running EFI runtime services Sasha Levin
2019-11-10  7:40   ` Ard Biesheuvel
2019-11-10  2:40 ` [PATCH AUTOSEL 4.19 191/191] x86/efi: fix a -Wtype-limits compilation warning Sasha Levin

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