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From: "Alex Bennée" <alex.bennee@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Richard Henderson <richard.henderson@linaro.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Laurent Vivier <laurent@vivier.eu>
Subject: Re: [PATCH v2 00/36] linux-user: Signal trampolines and vdsos
Date: Fri, 03 Sep 2021 14:39:30 +0100	[thread overview]
Message-ID: <87zgstpy21.fsf@linaro.org> (raw)
In-Reply-To: <CAFEAcA-xg=QEUqsBGqFAHiMVi2vBG_BSoC5nGbzdcpyHb_+Dhw@mail.gmail.com>


Peter Maydell <peter.maydell@linaro.org> writes:

> On Wed, 7 Jul 2021 at 00:51, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> Supercedes: <20210619034329.532318-1-richard.henderson@linaro.org>
>> ("[PATCH 00/12] linux-user: Load a vdso for x86_64 and hppa")
>>
>> Supercedes: <20210618192951.125651-1-richard.henderson@linaro.org>
>> ("[PATCH v2 00/23] linux-user: Move signal trampolines to new page")
>>
>> Changes for v2:
>>   * Add vdsos for aarch64, arm, i386, riscv.
>>   * Drop setup_sigtramp for any target with a vdso.
>>   * Drop arm v1 signal support.
>>   * Simplify ppc encode_trampoline.
>
> I'm not planning to review this series, but a general comment:
> I'm not really enthusiastic about the "vdso binaries checked into
> git and the build mechanism is a random makefile that has to be
> run by hand in the right environment" setup (and distros that
> like to build everything from source probably won't be keen
> either).

AIUI the vdso's are really pretty simple stubs more in line with our
stub launchers we currently have scattered around in our sources as hex
bytes. They are a bit bigger but not by much.

> At a minimum the handling of the cross-environment
> stuff should be more automated and reproducible like 'make check-tcg'.
> It would be useful also to get input from the Debian folks on
> how they'd want to see the build-from-source requirements/setup
> working...

In Debian they require cross compilers so they can build the various
blobs we use. However those blobs are packaged as "noarch" blobs and
only built on x86 where all the cross compilers are functional. This is
the reason you can't do a full build of QEMU packages on non-x86
platforms and why you need:

  apt build-dep -yy -a arm64 --arch-only qemu

so it doesn't barf trying to find cross compilers that haven't been
built for the host arch. So far my attempts to suggest the distros just
simply package all cross compilers on all supported host architectures
have been rebuffed on the basis it does tend to explode the build matrix
a bit.

The check-tcg compiler logic could be used to build the vdso's but it is
currently optional so if we can't run them you don't get any tests. I
suspect we still need to package the binary vdso blobs but use the
check-tcg machinery to rebuild them when we can.

>
> -- PMM


-- 
Alex Bennée


  reply	other threads:[~2021-09-03 13:52 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-06 23:48 [PATCH v2 00/36] linux-user: Signal trampolines and vdsos Richard Henderson
2021-07-06 23:48 ` [PATCH v2 01/36] linux-user: Add infrastructure for a signal trampoline page Richard Henderson
2021-07-06 23:48 ` [PATCH v2 02/36] linux-user: Fix style problems in linuxload.c Richard Henderson
2021-07-07 19:22   ` Laurent Vivier
2021-07-06 23:48 ` [PATCH v2 03/36] linux-user: Introduce imgsrc_read, imgsrc_read_alloc Richard Henderson
2021-07-06 23:49 ` [PATCH v2 04/36] linux-user: Tidy loader_exec Richard Henderson
2021-07-07  8:21   ` Philippe Mathieu-Daudé
2021-07-06 23:49 ` [PATCH v2 05/36] linux-user: Do not clobber bprm_buf swapping ehdr Richard Henderson
2021-07-06 23:49 ` [PATCH v2 06/36] linux-user: Use ImageSource in load_elf_image Richard Henderson
2021-07-06 23:49 ` [PATCH v2 07/36] linux-user: Use ImageSource in load_symbols Richard Henderson
2021-07-06 23:49 ` [PATCH v2 08/36] linux-user: Replace bprm->fd with bprm->src.fd Richard Henderson
2021-07-06 23:49 ` [PATCH v2 09/36] linux-user: Introduce imgsrc_mmap Richard Henderson
2021-07-06 23:49 ` [PATCH v2 10/36] linux-user: Load vdso image if available Richard Henderson
2021-07-06 23:49 ` [PATCH v2 11/36] linux-user: Add gen-vdso tool Richard Henderson
2021-07-06 23:49 ` [PATCH v2 12/36] linux-user/aarch64: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 13/36] linux-user/arm: Drop v1 signal frames Richard Henderson
2021-07-07  8:19   ` Philippe Mathieu-Daudé
2021-07-07 17:35   ` Peter Maydell
2021-07-06 23:49 ` [PATCH v2 14/36] linux-user/arm: Drop "_v2" from symbols in signal.c Richard Henderson
2021-07-07  8:19   ` Philippe Mathieu-Daudé
2021-07-06 23:49 ` [PATCH v2 15/36] target/arm: Add isar_feature_aa32_a32 Richard Henderson
2021-07-06 23:49 ` [PATCH v2 16/36] linux-user/arm: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 17/36] linux-user/alpha: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 18/36] linux-user/cris: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 19/36] linux-user/hexagon: " Richard Henderson
2021-07-12 23:08   ` Taylor Simpson
2021-07-06 23:49 ` [PATCH v2 20/36] linux-user/hppa: Add vdso and use it for rt_sigreturn Richard Henderson
2021-07-06 23:49 ` [PATCH v2 21/36] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set Richard Henderson
2021-07-06 23:49 ` [PATCH v2 22/36] linux-user/i386: Add vdso and use it for sigreturn Richard Henderson
2021-07-07 20:28   ` Richard Henderson
2021-07-06 23:49 ` [PATCH v2 23/36] linux-user/x86_64: Add vdso Richard Henderson
2021-07-06 23:49 ` [PATCH v2 24/36] linux-user/m68k: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 25/36] linux-user/microblaze: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 26/36] linux-user/mips: Tidy install_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 27/36] linux-user/mips: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 28/36] linux-user/nios2: Document non-use of setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 29/36] linux-user/openrisc: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 30/36] target/ppc: Simplify encode_trampoline Richard Henderson
2021-07-06 23:49 ` [PATCH v2 31/36] linux-user/ppc: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 32/36] linux-user/riscv: Add vdso and use it for sigreturn Richard Henderson
2021-07-06 23:49   ` Richard Henderson
2021-07-06 23:49 ` [PATCH v2 33/36] linux-user/s390x: Implement setup_sigtramp Richard Henderson
2021-07-06 23:49 ` [PATCH v2 34/36] linux-user/sh4: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 35/36] linux-user/sparc: " Richard Henderson
2021-07-06 23:49 ` [PATCH v2 36/36] linux-user/xtensa: " Richard Henderson
2021-07-08 10:55 ` [PATCH v2 00/36] linux-user: Signal trampolines and vdsos Philippe Mathieu-Daudé
2021-09-01  9:36 ` Peter Maydell
2021-09-03 13:39   ` Alex Bennée [this message]
2021-09-03 15:39     ` Richard Henderson

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