From: Shawn Guo <shawn.guo@linaro.org>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi <linux-efi@vger.kernel.org>,
Jeffrey Hugo <jhugo@codeaurora.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Rob Clark <robdclark@gmail.com>,
Leif Lindholm <leif@nuviainc.com>,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH] efi: stub: override RT_PROP table supported mask based on EFI variable
Date: Tue, 9 Mar 2021 11:22:49 +0800 [thread overview]
Message-ID: <20210309032248.GR17424@dragon> (raw)
In-Reply-To: <CAMj1kXFiqXwCqJE9Wxu-tc3HYSh1qCqPLL_Csc=gW6SOYrweWw@mail.gmail.com>
On Mon, Mar 08, 2021 at 02:34:48PM +0100, Ard Biesheuvel wrote:
> On Sun, 7 Mar 2021 at 12:02, Shawn Guo <shawn.guo@linaro.org> wrote:
> >
> > On Sat, Mar 06, 2021 at 12:35:19PM +0100, Ard Biesheuvel wrote:
> > > Allow EFI systems to override the set of supported runtime services
> > > declared via the RT_PROP table, by checking for the existence of a
> > > 'OverrideSupported' EFI variable of the appropriate size under the
> > > RT_PROP table GUID, and if it does, combine the supported mask using
> > > logical AND. (This means the override can only remove support, not
> > > add it back).
> > >
> > > Cc: Jeffrey Hugo <jhugo@codeaurora.org>,
> > > Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> > > Cc: Shawn Guo <shawn.guo@linaro.org>
> > > Cc: Rob Clark <robdclark@gmail.com>
> > > Cc: Leif Lindholm <leif@nuviainc.com>
> > > Cc: linux-arm-msm@vger.kernel.org
> > >
> > > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> >
> > Awesome, Ard! On both Lenovo Yoga C630 and Flex 5G latops:
> >
> > Tested-by: Shawn Guo <shawn.guo@linaro.org>
> >
> > With 'OverrideSupported' EFI variable added from UEFI Shell, we can drop
> > 'efi=novamap' kernel cmdline and get around the broken poweroff runtime
> > services nicely. Thanks!
> >
>
> Thanks for confirming.
>
> However, I am not going to merge this without some justification, and
> hopefully some input from other folks (Leif?)
>
> RTPROP already provides what we need on all platforms that use
> DtbLoader, and the patch for that is queued up for v5.12-rcX, with a
> cc:stable to v5.10. This allows any RT service to be marked as
> disabled, including SetVirtualAddressMap().
>
> So afaict, that means that this patch would be a special case for
> Flex5G, right?
It's for all Snapdragon based laptops, as we need to disable
SetVirtualAddressMap runtime services on all of them.
> So how are platforms such as this one going to load the
> DTB? If some loader will be involved (or even just GRUB),
Yes, GRUB.
> shouldn't it
> be that component that sets RTPROP like DtbLoader will, not the kernel
> itself.
>
> Btw I don't think ACPI boot is a use case here. I don't see a software
> framebuffer with no wifi support as a usage mode that justifies
> carrying EFI stub hacks for everyone.
Okay. I'm fine to carry it as an out-of-tree patch until someday you
consider ACPI boot is useful for everyone. But I do boot these laptops
with ACPI at daily basis right now as arm64 native build machine, with
USB Ethernet adapter.
Shawn
next prev parent reply other threads:[~2021-03-09 3:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-06 11:35 [PATCH] efi: stub: override RT_PROP table supported mask based on EFI variable Ard Biesheuvel
2021-03-07 11:02 ` Shawn Guo
2021-03-08 13:34 ` Ard Biesheuvel
2021-03-09 3:22 ` Shawn Guo [this message]
2021-03-09 8:51 ` Ard Biesheuvel
2021-03-09 18:13 ` Rob Clark
2021-03-09 18:47 ` Ard Biesheuvel
2021-03-09 21:19 ` Rob Clark
2021-03-15 3:11 ` Shawn Guo
2021-03-15 13:07 ` Ard Biesheuvel
2021-03-16 7:42 ` Heinrich Schuchardt
2021-03-16 7:52 ` Ard Biesheuvel
2021-03-16 8:04 ` Ilias Apalodimas
2021-03-16 8:14 ` Ard Biesheuvel
2021-03-16 8:27 ` Ilias Apalodimas
2021-03-16 7:52 ` Shawn Guo
2021-03-16 7:57 ` Ard Biesheuvel
2021-03-16 9:06 ` Shawn Guo
2021-03-16 9:33 ` Ard Biesheuvel
2021-03-17 6:36 ` Shawn Guo
2021-03-17 6:58 ` Ard Biesheuvel
2021-03-16 9:33 ` Ilias Apalodimas
2021-03-16 13:25 ` Heinrich Schuchardt
2021-03-16 14:06 ` Ard Biesheuvel
2021-03-16 14:45 ` Heinrich Schuchardt
2021-03-16 14:55 ` Ard Biesheuvel
2021-03-16 16:06 ` Heinrich Schuchardt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210309032248.GR17424@dragon \
--to=shawn.guo@linaro.org \
--cc=ardb@kernel.org \
--cc=bjorn.andersson@linaro.org \
--cc=jhugo@codeaurora.org \
--cc=leif@nuviainc.com \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-efi@vger.kernel.org \
--cc=robdclark@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).