From: Marc Zyngier <maz@misterjones.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Ard Biesheuvel <ardb@kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Alistair Delva <adelva@google.com>,
Kees Cook <keescook@chromium.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Kernel Hardening <kernel-hardening@lists.openwall.com>,
Peter Zijlstra <peterz@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
PCI <linux-pci@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Sami Tolvanen <samitolvanen@google.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v7 00/17] Add support for Clang LTO
Date: Sat, 21 Nov 2020 11:40:32 +0000 [thread overview]
Message-ID: <a578025ea33108773fe9f3f6e1f180b5@misterjones.org> (raw)
In-Reply-To: <CAKwvOdmk1D0dLDOHEWX=jHpUxUT2JbwgnF62Qv3Rv=coNPadHg@mail.gmail.com>
On 2020-11-20 23:53, Nick Desaulniers wrote:
> On Fri, Nov 20, 2020 at 3:30 PM Ard Biesheuvel <ardb@kernel.org> wrote:
>>
>> On Fri, 20 Nov 2020 at 21:19, Nick Desaulniers
>> <ndesaulniers@google.com> wrote:
>> >
>> > On Fri, Nov 20, 2020 at 2:30 AM Ard Biesheuvel <ardb@kernel.org> wrote:
>> > >
>> > > On Thu, 19 Nov 2020 at 00:42, Nick Desaulniers <ndesaulniers@google.com> wrote:
>> > > >
>> > > > Thanks for continuing to drive this series Sami. For the series,
>> > > >
>> > > > Tested-by: Nick Desaulniers <ndesaulniers@google.com>
>> > > >
>> > > > I did virtualized boot tests with the series applied to aarch64
>> > > > defconfig without CONFIG_LTO, with CONFIG_LTO_CLANG, and a third time
>> > > > with CONFIG_THINLTO. If you make changes to the series in follow ups,
>> > > > please drop my tested by tag from the modified patches and I'll help
>> > > > re-test. Some minor feedback on the Kconfig change, but I'll post it
>> > > > off of that patch.
>> > > >
>> > >
>> > > When you say 'virtualized" do you mean QEMU on x86? Or actual
>> > > virtualization on an AArch64 KVM host?
>> >
>> > aarch64 guest on x86_64 host. If you have additional configurations
>> > that are important to you, additional testing help would be
>> > appreciated.
>> >
>>
>> Could you run this on an actual phone? Or does Android already ship
>> with this stuff?
>
> By `this`, if you mean "the LTO series", it has been shipping on
> Android phones for years now, I think it's even required in the latest
> release.
>
> If you mean "the LTO series + mainline" on a phone, well there's the
> android-mainline of https://android.googlesource.com/kernel/common/,
> in which this series was recently removed in order to facilitate
> rebasing Android's patches on ToT-mainline until getting the series
> landed upstream. Bit of a chicken and the egg problem there.
>
> If you mean "the LTO series + mainline + KVM" on a phone; I don't know
> the precise state of aarch64 KVM and Android (Will or Marc would
> know).
If you are lucky enough to have an Android system booting at EL2,
KVM should just works [1], though I haven't tried with this series.
> We did experiment recently with RockPI's for aach64 KVM, IIRC;
> I think Android is tricky as it still requires A64+A32/T32 chipsets,
Which is about 100% of the Android systems at the moment (I don't think
any of the asymmetric SoCs are in the wild yet). It doesn't really
affect
KVM anyway.
M.
[1] with the broken firmware gotchas that I believed to be erradicated
8 years ago, but are still prevalent in the Android world: laughable
PSCI implementation, invalid CNTFRQ_EL0...
--
Who you jivin' with that Cosmik Debris?
next prev parent reply other threads:[~2020-11-21 11:41 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 22:07 [PATCH v7 00/17] Add support for Clang LTO Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 01/17] tracing: move function tracer options to Kconfig Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 02/17] kbuild: add support for Clang LTO Sami Tolvanen
2020-11-18 23:48 ` Nick Desaulniers
2020-11-20 16:23 ` Sami Tolvanen
2020-11-20 19:47 ` Kees Cook
2020-11-20 20:29 ` Nathan Chancellor
2020-11-20 20:43 ` Kees Cook
2020-11-20 20:58 ` Sami Tolvanen
2020-11-20 23:59 ` Kees Cook
2020-11-21 1:46 ` Sami Tolvanen
2020-11-21 20:11 ` Kees Cook
2020-11-18 22:07 ` [PATCH v7 03/17] kbuild: lto: fix module versioning Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 04/17] kbuild: lto: limit inlining Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 05/17] kbuild: lto: merge module sections Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 06/17] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 07/17] init: lto: ensure initcall ordering Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 08/17] init: lto: fix PREL32 relocations Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 09/17] PCI: Fix PREL32 relocations for LTO Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 10/17] modpost: lto: strip .lto from module names Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 11/17] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 12/17] efi/libstub: disable LTO Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 13/17] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 14/17] arm64: vdso: disable LTO Sami Tolvanen
2020-11-30 11:52 ` Will Deacon
2020-11-30 23:44 ` Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 15/17] KVM: arm64: disable LTO for the nVHE directory Sami Tolvanen
2020-11-23 10:21 ` David Brazdil
2020-11-23 18:34 ` Sami Tolvanen
2020-11-18 22:07 ` [PATCH v7 16/17] arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS Sami Tolvanen
2020-11-30 11:59 ` Will Deacon
2020-11-18 22:07 ` [PATCH v7 17/17] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-11-30 12:00 ` Will Deacon
2020-11-18 23:42 ` [PATCH v7 00/17] Add support for Clang LTO Nick Desaulniers
2020-11-20 10:29 ` Ard Biesheuvel
2020-11-20 20:19 ` Nick Desaulniers
2020-11-20 23:30 ` Ard Biesheuvel
2020-11-20 23:53 ` Nick Desaulniers
2020-11-21 7:35 ` Ard Biesheuvel
2020-11-21 11:40 ` Marc Zyngier [this message]
2020-11-21 3:14 ` Nathan Chancellor
2020-11-20 4:04 ` Josh Poimboeuf
2020-11-20 20:25 ` Sami Tolvanen
2020-11-30 12:01 ` Will Deacon
2020-12-01 17:31 ` Kees Cook
2020-12-01 19:51 ` Nick Desaulniers
2020-12-01 21:38 ` Sami Tolvanen
2020-12-02 2:42 ` Masahiro Yamada
2020-12-02 5:46 ` Sami Tolvanen
2020-12-02 18:54 ` Kees Cook
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