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Date: Thu, 9 Nov 2017 19:54:40 +0900 From: AKASHI Takahiro <takahiro.akashi@...aro.org> To: Mark Rutland <mark.rutland@....com> Cc: Sami Tolvanen <samitolvanen@...gle.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Kees Cook <keescook@...omium.org>, LKML <linux-kernel@...r.kernel.org>, Greg Hackmann <ghackmann@...gle.com>, Matthias Kaehlcke <mka@...omium.org>, linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com, cdall@...aro.org, ard.biesheuvel@...aro.org Subject: Re: [PATCH 00/15] Add support for clang LTO On Sat, Nov 04, 2017 at 02:13:04AM +0000, Mark Rutland wrote: > On Fri, Nov 03, 2017 at 12:56:47PM -0700, Sami Tolvanen wrote: > > On Fri, Nov 03, 2017 at 07:26:35PM +0000, Mark Rutland wrote: > > > I guess that in Google you haven't tested on a platform with EL2 > > > available? > > > > Correct. I'll look into this and include a fix in v2. Does this work on a > > clang build without LTO? > > I saw this on v4.14-rc7, with patch 7 (-mno-implicit-float), but no other > patches from this series (i.e. no LTO). Add -fno-jump-tables to ccflags-y of arch/arm64/kvm/hyp/Makefile. Without this option, clang generates a branch instruction (br x11) to an absolute (EL1) virtual address. -Takahiro AKASHI > Thanks, > Mark.
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