From: Peter Maydell <peter.maydell@linaro.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Christoph Hellwig <hch@lst.de>,
linux-arch@vger.kernel.org,
lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
Vladimir Murzin <vladimir.murzin@arm.com>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 1/6] syscalls: use uaccess_kernel in addr_limit_user_check
Date: Mon, 20 Jul 2020 16:28:35 +0100 [thread overview]
Message-ID: <CAFEAcA8=O6TbxYwmRwZJbcqFKi364=ueV_TsTu_84M5WFVtD8g@mail.gmail.com> (raw)
In-Reply-To: <c6099697-5ccd-22b4-f5cb-cbe1c14644a9@roeck-us.net>
On Mon, 20 Jul 2020 at 15:55, Guenter Roeck <linux@roeck-us.net> wrote:
> Ah, sorry, you can't use the upstream version of qemu to test mps2-an385
> Linux images. You'll have to use a version from https://github.com/groeck/qemu.
> I'd recommend to use the v5.0.0-local branch.
>
> I had to make some changes to qemu to be able to boot mps2-an385.
> I tried to submit those changes into upstream qemu, but that was
> rejected because, as I was told, the qemu implementation
> would no longer reflect the real hardware with those changes in
> place.
Yes; the rationale is that if you wanted to boot a kernel
on an actual MPS2 board you'd need a bit of guest code to
start it up (and to bundle the initrd/dtb in with it), so
since you need to write that code anyway you could use it for
booting the kernel in QEMU too.
I appreciate that this is awkward for kernel developers (and
perhaps for some other users too), but QEMU's handling of
-kernel and built-in-bootloader code is already a morass of
special cases and do-what-I-mean behaviour that I'm not
enthusiastic about further complicating :-)
(https://lists.gnu.org/archive/html/qemu-arm/2018-06/msg00393.html
has the archive of our original discussion on the point, for
other readers of this post interested in further context and
discussion.)
thanks
-- PMM
WARNING: multiple messages have this Message-ID (diff)
From: Peter Maydell <peter.maydell@linaro.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-arch@vger.kernel.org,
Vladimir Murzin <vladimir.murzin@arm.com>,
Christoph Hellwig <hch@lst.de>,
arm-mail-list <linux-arm-kernel@lists.infradead.org>,
lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/6] syscalls: use uaccess_kernel in addr_limit_user_check
Date: Mon, 20 Jul 2020 16:28:35 +0100 [thread overview]
Message-ID: <CAFEAcA8=O6TbxYwmRwZJbcqFKi364=ueV_TsTu_84M5WFVtD8g@mail.gmail.com> (raw)
In-Reply-To: <c6099697-5ccd-22b4-f5cb-cbe1c14644a9@roeck-us.net>
On Mon, 20 Jul 2020 at 15:55, Guenter Roeck <linux@roeck-us.net> wrote:
> Ah, sorry, you can't use the upstream version of qemu to test mps2-an385
> Linux images. You'll have to use a version from https://github.com/groeck/qemu.
> I'd recommend to use the v5.0.0-local branch.
>
> I had to make some changes to qemu to be able to boot mps2-an385.
> I tried to submit those changes into upstream qemu, but that was
> rejected because, as I was told, the qemu implementation
> would no longer reflect the real hardware with those changes in
> place.
Yes; the rationale is that if you wanted to boot a kernel
on an actual MPS2 board you'd need a bit of guest code to
start it up (and to bundle the initrd/dtb in with it), so
since you need to write that code anyway you could use it for
booting the kernel in QEMU too.
I appreciate that this is awkward for kernel developers (and
perhaps for some other users too), but QEMU's handling of
-kernel and built-in-bootloader code is already a morass of
special cases and do-what-I-mean behaviour that I'm not
enthusiastic about further complicating :-)
(https://lists.gnu.org/archive/html/qemu-arm/2018-06/msg00393.html
has the archive of our original discussion on the point, for
other readers of this post interested in further context and
discussion.)
thanks
-- PMM
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-07-20 15:28 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 10:54 clean up address limit helpers v2 Christoph Hellwig
2020-07-14 10:54 ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 1/6] syscalls: use uaccess_kernel in addr_limit_user_check Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-18 1:38 ` Guenter Roeck
2020-07-18 1:38 ` Guenter Roeck
2020-07-18 9:48 ` Christoph Hellwig
2020-07-18 9:48 ` Christoph Hellwig
2020-07-18 14:54 ` Guenter Roeck
2020-07-18 14:54 ` Guenter Roeck
2020-07-20 10:01 ` Christoph Hellwig
2020-07-20 10:01 ` Christoph Hellwig
2020-07-20 14:55 ` Guenter Roeck
2020-07-20 14:55 ` Guenter Roeck
2020-07-20 15:28 ` Peter Maydell [this message]
2020-07-20 15:28 ` Peter Maydell
2020-07-20 22:10 ` Guenter Roeck
2020-07-20 22:10 ` Guenter Roeck
2020-07-21 4:58 ` Christoph Hellwig
2020-07-21 4:58 ` Christoph Hellwig
2020-07-21 5:15 ` Guenter Roeck
2020-07-21 5:15 ` Guenter Roeck
2020-07-21 5:20 ` Christoph Hellwig
2020-07-21 5:20 ` Christoph Hellwig
2020-07-21 5:30 ` Guenter Roeck
2020-07-21 5:30 ` Guenter Roeck
2020-07-21 5:35 ` Christoph Hellwig
2020-07-21 5:35 ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 2/6] nds32: use uaccess_kernel in show_regs Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 3/6] riscv: include <asm/pgtable.h> in <asm/uaccess.h> Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-14 10:55 ` [PATCH 4/6] uaccess: remove segment_eq Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-14 15:27 ` Linus Torvalds
2020-07-14 15:27 ` Linus Torvalds
2020-07-14 10:55 ` [PATCH 5/6] uaccess: add force_uaccess_{begin,end} helpers Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-14 15:29 ` Linus Torvalds
2020-07-14 15:29 ` Linus Torvalds
2020-07-14 10:55 ` [PATCH 6/6] exec: use force_uaccess_begin during exec and exit Christoph Hellwig
2020-07-14 10:55 ` Christoph Hellwig
2020-07-15 3:33 ` Eric W. Biederman
2020-07-15 3:33 ` Eric W. Biederman
2020-07-15 6:06 ` Christoph Hellwig
2020-07-15 6:06 ` Christoph Hellwig
2020-07-16 23:49 ` clean up address limit helpers v2 Andrew Morton
2020-07-16 23:49 ` Andrew Morton
2020-07-17 6:06 ` Christoph Hellwig
2020-07-17 6:06 ` Christoph Hellwig
2020-07-20 15:54 ` [PATCH 0/6] arm: don't call addr_limit_user_check for nommu Christoph Hellwig
2020-07-20 15:54 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2020-07-10 13:57 clean up address limit helpers Christoph Hellwig
2020-07-10 13:57 ` [PATCH 1/6] syscalls: use uaccess_kernel in addr_limit_user_check Christoph Hellwig
2020-07-10 13:57 ` Christoph Hellwig
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