Date: Fri, 20 Nov 2020 12:19:31 -0800 From: Nick Desaulniers <ndesaulniers@...gle.com> To: Ard Biesheuvel <ardb@...nel.org> Cc: Sami Tolvanen <samitolvanen@...gle.com>, Masahiro Yamada <masahiroy@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Will Deacon <will@...nel.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Paul E. McKenney" <paulmck@...nel.org>, Kees Cook <keescook@...omium.org>, clang-built-linux <clang-built-linux@...glegroups.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arch <linux-arch@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, PCI <linux-pci@...r.kernel.org>, Alistair Delva <adelva@...gle.com> Subject: Re: [PATCH v7 00/17] Add support for Clang LTO On Fri, Nov 20, 2020 at 2:30 AM Ard Biesheuvel <ardb@...nel.org> wrote: > > On Thu, 19 Nov 2020 at 00:42, Nick Desaulniers <ndesaulniers@...gle.com> wrote: > > > > Thanks for continuing to drive this series Sami. For the series, > > > > Tested-by: Nick Desaulniers <ndesaulniers@...gle.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. > > The distinction is important here, given the potential impact of LTO > on things that QEMU simply does not model when it runs in TCG mode on > a foreign host architecture. -- Thanks, ~Nick Desaulniers
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