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From: Sami Tolvanen <samitolvanen@google.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	 Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	 Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Dave Martin <Dave.Martin@arm.com>,
	 Kees Cook <keescook@chromium.org>,
	Laura Abbott <labbott@redhat.com>,  Marc Zyngier <maz@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Jann Horn <jannh@google.com>,
	 Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	 Masahiro Yamada <yamada.masahiro@socionext.com>,
	 clang-built-linux <clang-built-linux@googlegroups.com>,
	 Kernel Hardening <kernel-hardening@lists.openwall.com>,
	 linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 03/17] arm64: kvm: stop treating register x18 as caller save
Date: Mon, 4 Nov 2019 13:44:30 -0800
Message-ID: <CABCJKuf4wi6oUkJ68Z49UkK5q4WYYmSPt1X0pyw34ueNMkGC5Q@mail.gmail.com> (raw)
In-Reply-To: <20191104115138.GB45140@lakrids.cambridge.arm.com>

On Mon, Nov 4, 2019 at 3:51 AM Mark Rutland <mark.rutland@arm.com> wrote:
> > --- a/arch/arm64/kvm/hyp/entry.S
> > +++ b/arch/arm64/kvm/hyp/entry.S
> > @@ -23,6 +23,7 @@
> >       .pushsection    .hyp.text, "ax"
> >
>
> Could we please add a note here, e.g.
>
> /*
>  * We treat x18 as callee-saved as the host may use it as a platform
>  * register (e.g. for shadow call stack).
>  */
>
> ... as that will avoid anyone trying to optimize this away in future
> after reading the AAPCS.

Sure, that's a good idea.

> >  .macro restore_callee_saved_regs ctxt
> > +     // We assume \ctxt is not x18-x28
>
> Probably worth s/assume/require/ here.

Agreed, I'll change this in v5.

Sami

  reply index

Thread overview: 252+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-18 16:10 [PATCH 00/18] add support for Clang's Shadow Call Stack Sami Tolvanen
2019-10-18 16:10 ` [PATCH 01/18] arm64: mm: don't use x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-10-18 16:43   ` Nick Desaulniers
2019-10-18 16:10 ` [PATCH 02/18] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-10-18 16:10 ` [PATCH 03/18] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-10-21  6:19   ` Ard Biesheuvel
2019-10-22 17:22   ` Marc Zyngier
2019-10-22 21:45     ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 04/18] arm64: kernel: avoid x18 as an arbitrary temp register Sami Tolvanen
2019-10-18 16:10 ` [PATCH 05/18] arm64: kbuild: reserve reg x18 from general allocation by the compiler Sami Tolvanen
2019-10-18 17:32   ` Nick Desaulniers
2019-10-18 19:00     ` Sami Tolvanen
2019-10-21  6:12       ` Ard Biesheuvel
2019-10-21 20:43         ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 06/18] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-10-18 16:58   ` Joe Perches
2019-10-18 17:08   ` Nick Desaulniers
2019-10-18 17:11     ` Sami Tolvanen
2019-10-18 18:32       ` Miguel Ojeda
2019-10-18 20:33         ` Nick Desaulniers
2019-10-19  0:21           ` Miguel Ojeda
2019-10-18 17:42   ` Jann Horn
2019-10-18 17:56     ` Sami Tolvanen
2019-10-22 16:28   ` Mark Rutland
2019-10-22 16:30     ` Kees Cook
2019-10-22 16:49       ` Mark Rutland
2019-10-22 19:26     ` Sami Tolvanen
2019-10-24 13:28       ` Mark Rutland
2019-10-24 14:38         ` Masahiro Yamada
2019-10-23 16:59     ` Sami Tolvanen
2019-10-24  1:47       ` Masahiro Yamada
2019-10-24 12:04       ` Steven Rostedt
2019-10-24 22:17         ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 07/18] scs: add accounting Sami Tolvanen
2019-10-18 16:10 ` [PATCH 08/18] scs: add support for stack usage debugging Sami Tolvanen
2019-10-18 16:10 ` [PATCH 09/18] trace: disable function graph tracing with SCS Sami Tolvanen
2019-10-18 17:01   ` Steven Rostedt
2019-10-18 17:08     ` Sami Tolvanen
2019-10-21  6:15   ` Ard Biesheuvel
2019-10-18 16:10 ` [PATCH 10/18] kprobes: fix compilation without CONFIG_KRETPROBES Sami Tolvanen
2019-10-18 17:02   ` Steven Rostedt
2019-10-21  9:13     ` Masami Hiramatsu
2019-10-18 16:10 ` [PATCH 11/18] kprobes: disable kretprobes with SCS Sami Tolvanen
2019-10-18 17:04   ` Steven Rostedt
2019-10-21  9:15     ` Masami Hiramatsu
2019-10-18 16:10 ` [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack Sami Tolvanen
2019-10-18 21:23   ` Nick Desaulniers
2019-10-22 16:00     ` Mark Rutland
2019-10-22 16:27       ` Kees Cook
2019-10-18 16:10 ` [PATCH 13/18] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-10-18 16:49   ` Nick Desaulniers
2019-10-18 17:05     ` Sami Tolvanen
2019-10-21 16:56   ` Mark Rutland
2019-10-21 22:43     ` Sami Tolvanen
2019-10-22 15:47       ` Mark Rutland
2019-10-18 16:10 ` [PATCH 14/18] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-10-21  6:20   ` Ard Biesheuvel
2019-10-21 22:39     ` Sami Tolvanen
2019-10-22  5:54       ` Ard Biesheuvel
2019-10-18 16:10 ` [PATCH 15/18] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-10-18 16:10 ` [PATCH 16/18] arm64: kprobes: fix kprobes without CONFIG_KRETPROBES Sami Tolvanen
2019-10-21  6:21   ` Ard Biesheuvel
2019-10-21 16:06     ` Kees Cook
2019-10-18 16:10 ` [PATCH 17/18] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-10-18 16:10 ` [PATCH 18/18] arm64: implement Shadow Call Stack Sami Tolvanen
2019-10-18 17:12   ` Jann Horn
2019-10-18 17:18     ` Sami Tolvanen
2019-10-18 17:23     ` Mark Rutland
2019-10-18 17:35       ` Sami Tolvanen
2019-10-21 16:49         ` Mark Rutland
2019-10-21  9:28 ` [PATCH 00/18] add support for Clang's " Masami Hiramatsu
2019-10-24 22:51 ` [PATCH v2 00/17] " samitolvanen
2019-10-24 22:51   ` [PATCH v2 01/17] arm64: mm: don't use x18 in idmap_kpti_install_ng_mappings samitolvanen
2019-10-25  9:24     ` Mark Rutland
2019-10-24 22:51   ` [PATCH v2 02/17] arm64/lib: copy_page: avoid x18 register in assembler code samitolvanen
2019-10-25  9:41     ` Mark Rutland
2019-10-25 21:40       ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 03/17] arm64: kvm: stop treating register x18 as caller save samitolvanen
2019-10-24 22:51   ` [PATCH v2 04/17] arm64: kernel: avoid x18 as an arbitrary temp register samitolvanen
2019-10-25 10:02     ` Mark Rutland
2019-10-24 22:51   ` [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS) samitolvanen
2019-10-25 10:56     ` Mark Rutland
2019-10-25 20:49       ` Sami Tolvanen
2019-10-28 16:35         ` Mark Rutland
2019-10-28 19:57           ` Kees Cook
2019-10-29 18:06             ` Sami Tolvanen
2019-10-25 16:22     ` Nick Desaulniers
2019-10-25 20:51       ` Sami Tolvanen
2019-10-26 15:57     ` Joe Perches
2019-10-28 15:19       ` Sami Tolvanen
2019-10-28 15:31         ` Miguel Ojeda
2019-10-28 16:15           ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 06/17] scs: add accounting samitolvanen
2019-10-24 22:51   ` [PATCH v2 07/17] scs: add support for stack usage debugging samitolvanen
2019-10-24 22:51   ` [PATCH v2 08/17] kprobes: fix compilation without CONFIG_KRETPROBES samitolvanen
2019-10-24 22:51   ` [PATCH v2 09/17] arm64: disable function graph tracing with SCS samitolvanen
2019-10-25 11:03     ` Mark Rutland
2019-10-29 17:45       ` Sami Tolvanen
2019-10-29 20:35         ` Nick Desaulniers
2019-10-24 22:51   ` [PATCH v2 10/17] arm64: disable kretprobes " samitolvanen
2019-10-24 22:51   ` [PATCH v2 11/17] arm64: reserve x18 from general allocation " samitolvanen
2019-10-24 22:51   ` [PATCH v2 12/17] arm64: preserve x18 when CPU is suspended samitolvanen
2019-10-24 22:51   ` [PATCH v2 13/17] arm64: efi: restore x18 if it was corrupted samitolvanen
2019-10-24 22:51   ` [PATCH v2 14/17] arm64: vdso: disable Shadow Call Stack samitolvanen
2019-10-24 22:51   ` [PATCH v2 15/17] arm64: kprobes: fix kprobes without CONFIG_KRETPROBES samitolvanen
2019-10-24 22:51   ` [PATCH v2 16/17] arm64: disable SCS for hypervisor code samitolvanen
2019-10-25  1:20     ` Steven Rostedt
2019-10-25  1:29     ` Masahiro Yamada
2019-10-25  1:42       ` Steven Rostedt
2019-10-25 19:24       ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 17/17] arm64: implement Shadow Call Stack samitolvanen
2019-10-31 16:46 ` [PATCH v3 00/17] add support for Clang's " samitolvanen
2019-10-31 16:46   ` [PATCH v3 01/17] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings samitolvanen
2019-10-31 16:46   ` [PATCH v3 02/17] arm64/lib: copy_page: avoid x18 register in assembler code samitolvanen
2019-10-31 16:46   ` [PATCH v3 03/17] arm64: kvm: stop treating register x18 as caller save samitolvanen
2019-11-01  3:48     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 04/17] arm64: kernel: avoid x18 __cpu_soft_restart samitolvanen
2019-11-01  3:47     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 05/17] add support for Clang's Shadow Call Stack (SCS) samitolvanen
2019-11-01  3:51     ` Kees Cook
2019-11-01 16:28       ` Sami Tolvanen
2019-10-31 16:46   ` [PATCH v3 06/17] scs: add accounting samitolvanen
2019-11-01  3:52     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 07/17] scs: add support for stack usage debugging samitolvanen
2019-11-01  3:55     ` Kees Cook
2019-11-01 16:32       ` Sami Tolvanen
2019-11-01 19:02         ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 08/17] kprobes: fix compilation without CONFIG_KRETPROBES samitolvanen
2019-11-01  3:55     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 09/17] arm64: kprobes: fix kprobes " samitolvanen
2019-11-01  3:56     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 10/17] arm64: disable kretprobes with SCS samitolvanen
2019-11-01  3:56     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 11/17] arm64: disable function graph tracing " samitolvanen
2019-11-01  3:58     ` Kees Cook
2019-11-01 20:32       ` Sami Tolvanen
2019-10-31 16:46   ` [PATCH v3 12/17] arm64: reserve x18 from general allocation " samitolvanen
2019-10-31 17:11     ` Nick Desaulniers
2019-11-01  3:59     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 13/17] arm64: preserve x18 when CPU is suspended samitolvanen
2019-10-31 17:18     ` Nick Desaulniers
2019-10-31 17:27       ` Sami Tolvanen
2019-10-31 17:34         ` Nick Desaulniers
2019-10-31 17:42           ` Sami Tolvanen
2019-11-01  3:59           ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 14/17] arm64: efi: restore x18 if it was corrupted samitolvanen
2019-11-01  4:00     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 15/17] arm64: vdso: disable Shadow Call Stack samitolvanen
2019-10-31 17:28     ` Nick Desaulniers
2019-11-01  4:01     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 16/17] arm64: disable SCS for hypervisor code samitolvanen
2019-11-01  3:46     ` Kees Cook
2019-11-01  4:02     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 17/17] arm64: implement Shadow Call Stack samitolvanen
2019-11-01  3:45     ` Kees Cook
2019-11-01 15:44       ` Sami Tolvanen
2019-11-01 22:11 ` [PATCH v4 00/17] add support for Clang's " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 01/17] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 02/17] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 03/17] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-11-04 11:04     ` Marc Zyngier
2019-11-04 13:30       ` Marc Zyngier
2019-11-04 11:51     ` Mark Rutland
2019-11-04 21:44       ` Sami Tolvanen [this message]
2019-11-01 22:11   ` [PATCH v4 04/17] arm64: kernel: avoid x18 __cpu_soft_restart Sami Tolvanen
2019-11-04 11:39     ` Mark Rutland
2019-11-04 16:44       ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 05/17] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-11-01 22:36     ` Miguel Ojeda
2019-11-04 12:31     ` Mark Rutland
2019-11-04 18:25       ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 06/17] scs: add accounting Sami Tolvanen
2019-11-04 13:13     ` Marc Zyngier
2019-11-04 16:42       ` Sami Tolvanen
2019-11-04 16:59         ` Marc Zyngier
2019-11-01 22:11   ` [PATCH v4 07/17] scs: add support for stack usage debugging Sami Tolvanen
2019-11-02 17:31     ` Kees Cook
2019-11-04 12:40     ` Mark Rutland
2019-11-04 21:35       ` Sami Tolvanen
2019-11-05  9:17         ` Mark Rutland
2019-11-01 22:11   ` [PATCH v4 08/17] kprobes: fix compilation without CONFIG_KRETPROBES Sami Tolvanen
2019-11-13 20:27     ` Steven Rostedt
2019-11-01 22:11   ` [PATCH v4 09/17] arm64: kprobes: fix kprobes " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 10/17] arm64: disable kretprobes with SCS Sami Tolvanen
2019-11-04 17:04     ` Mark Rutland
2019-11-04 23:42       ` Sami Tolvanen
2019-11-05  9:04         ` Mark Rutland
2019-11-01 22:11   ` [PATCH v4 11/17] arm64: disable function graph tracing " Sami Tolvanen
2019-11-04 17:11     ` Mark Rutland
2019-11-04 23:44       ` Sami Tolvanen
2019-11-05  9:15         ` Mark Rutland
2019-11-05 20:00           ` Nick Desaulniers
2019-11-05 22:05           ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 12/17] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 13/17] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-11-04 13:20     ` Marc Zyngier
2019-11-04 21:38       ` Sami Tolvanen
2019-11-04 21:59         ` Nick Desaulniers
2019-11-05  0:02           ` Sami Tolvanen
2019-11-05 14:55             ` Marc Zyngier
2019-11-01 22:11   ` [PATCH v4 14/17] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 15/17] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 16/17] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 17/17] arm64: implement Shadow Call Stack Sami Tolvanen
2019-11-05 23:55 ` [PATCH v5 00/14] add support for Clang's " Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 01/14] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 02/14] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 03/14] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 04/14] arm64: kernel: avoid x18 in __cpu_soft_restart Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 05/14] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-11-15 15:37     ` Mark Rutland
2019-11-15 18:34       ` Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 06/14] scs: add accounting Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 07/14] scs: add support for stack usage debugging Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 08/14] arm64: disable function graph tracing with SCS Sami Tolvanen
2019-11-15 14:18     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 09/14] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 10/14] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-11-06 20:39     ` Nick Desaulniers
2019-11-15 14:27     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 11/14] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-11-06  4:45     ` Miguel Ojeda
2019-11-07 10:51       ` Ard Biesheuvel
2019-11-07 16:26         ` Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 12/14] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-11-15 14:43     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 13/14] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-11-15 14:46     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 14/14] arm64: implement Shadow Call Stack Sami Tolvanen
2019-11-15 15:20     ` Mark Rutland
2019-11-15 20:19       ` Sami Tolvanen
2019-11-18 23:13         ` Sami Tolvanen
2019-11-12 23:44   ` [PATCH v5 00/14] add support for Clang's " Kees Cook
2019-11-13 12:03     ` Will Deacon
2019-11-13 18:33       ` Kees Cook
2019-11-15 14:16     ` Mark Rutland
2019-12-06 22:13 ` [PATCH v6 00/15] " Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 01/15] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 02/15] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 03/15] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 04/15] arm64: kernel: avoid x18 in __cpu_soft_restart Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 05/15] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 06/15] scs: add accounting Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 07/15] scs: add support for stack usage debugging Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 08/15] arm64: disable function graph tracing with SCS Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 09/15] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 10/15] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 11/15] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 12/15] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 13/15] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 14/15] arm64: implement Shadow Call Stack Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 15/15] arm64: scs: add shadow stacks for SDEI Sami Tolvanen

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