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From: vgoyal@redhat.com (Vivek Goyal)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 6/7] arm64/kexec: Add core kexec support
Date: Wed, 1 Oct 2014 13:47:14 -0400	[thread overview]
Message-ID: <20141001174714.GD14991@redhat.com> (raw)
In-Reply-To: <20141001161621.GA28440@leverpostej>

On Wed, Oct 01, 2014 at 05:16:21PM +0100, Mark Rutland wrote:

[..]
> I'm still rather unhappy about the mechanism by which the DTB is passed
> by userspace and detected by the kernel, as I'd prefer that the user
> explictly stated which segment they wanted to pass to the (Linux)
> kernel, but that would require reworking the kexec syscall to allow
> per-segment info/flags.

Why does the running kernel need to know about dtb segment.  I see following.

ldr     x0, kexec_dtb_addr

IIUC, we are loading this address in x0. Can't we do something similar
in user space with purgatory. I mean first jump to purgatory (code
compiled in user space but runs prviliged) and that code takes care
of loading x0 with right dtb addr and then jump to final kernel.

IOW, I am not able to understand that why kernel implementation needs
to know which is dtb segment.

Thanks
Vivek

  parent reply	other threads:[~2014-10-01 17:47 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-25  0:23 [PATCH 0/7] arm64 kexec kernel patches V3 Geoff Levand
2014-09-25  0:23 ` [PATCH 2/7] arm64: Convert hcalls to use ISS field Geoff Levand
2014-10-03 10:51   ` Mark Rutland
2014-10-03 21:56     ` Geoff Levand
2014-10-06 10:13       ` Mark Rutland
2014-09-25  0:23 ` [PATCH 3/7] arm64: Add new hcall HVC_CALL_FUNC Geoff Levand
2014-09-25  0:23 ` [PATCH 4/7] arm64: Add EL2 switch to soft_restart Geoff Levand
2014-09-25  0:23 ` [PATCH 1/7] arm64/kvm: Fix assembler compatibility of macros Geoff Levand
2014-10-03 10:26   ` Mark Rutland
2014-10-03 22:27     ` Geoff Levand
2014-10-06 10:10       ` Mark Rutland
2014-09-25  0:23 ` [PATCH 5/7] arm64: Move proc-macros.S to include/asm Geoff Levand
2014-09-25  0:23 ` [PATCH 7/7] arm64/kexec: Enable kexec in the arm64 defconfig Geoff Levand
2014-09-25  0:23 ` [PATCH 6/7] arm64/kexec: Add core kexec support Geoff Levand
2014-09-25 18:28   ` Vivek Goyal
2014-09-25 19:02     ` Geoff Levand
2014-09-25 19:08       ` Vivek Goyal
2014-09-30 18:18   ` Vivek Goyal
2014-09-30 19:54     ` Geoff Levand
2014-10-01 14:56       ` Vivek Goyal
2014-10-03 18:35         ` Geoff Levand
2014-10-07 13:44           ` Vivek Goyal
2014-10-07 18:42             ` Geoff Levand
2014-10-07 18:45               ` Vivek Goyal
2014-10-07 20:12                 ` Geoff Levand
2014-10-07 20:22                   ` Vivek Goyal
2014-10-09 22:26                     ` Geoff Levand
2014-10-23 23:08                       ` Geoff Levand
2014-10-08  9:28                   ` Mark Rutland
2014-10-07 18:48               ` Vivek Goyal
2014-10-01 16:16       ` Mark Rutland
2014-10-01 17:36         ` Vivek Goyal
2014-10-01 17:56           ` Mark Rutland
2014-10-01 17:47         ` Vivek Goyal [this message]
2014-10-01 18:03           ` Mark Rutland
2014-10-01 18:09             ` Vivek Goyal
2014-10-01 18:19               ` Mark Rutland
2014-10-01 18:31                 ` Vivek Goyal
2014-10-01 19:22             ` Vivek Goyal
2014-10-02 10:26               ` Mark Rutland
2014-10-02 13:54                 ` Vivek Goyal
2014-10-02 16:53                   ` Mark Rutland
2014-09-30 23:59   ` [PATCH V2 " Geoff Levand
2014-09-30 20:29 ` [PATCH 0/7] arm64 kexec kernel patches V3 Vivek Goyal
2014-09-30 21:27   ` Geoff Levand
2014-10-02 19:08     ` Vivek Goyal
2014-10-02 22:59       ` Geoff Levand
2014-10-07 13:43         ` Vivek Goyal
2014-10-07 14:06           ` Mark Rutland
2014-10-01 15:19 ` Vivek Goyal
2014-10-03 21:16   ` Geoff Levand
2014-10-07 13:40     ` Vivek Goyal
2014-10-07 18:29       ` Geoff Levand
2014-10-08  9:42       ` Mark Rutland
2014-10-09  3:21         ` Dave Young
2014-10-09 10:09           ` Mark Rutland
2014-10-09 10:19             ` Ard Biesheuvel
2014-10-10  5:30             ` Dave Young
2014-10-07 15:22     ` Mark Rutland
2014-10-07 18:28       ` Geoff Levand
2014-10-07 18:09 ` Vivek Goyal
2014-10-07 20:07   ` Geoff Levand
2014-10-08  9:52     ` Leif Lindholm
2014-10-08 10:07       ` Mark Rutland
2014-10-09  9:22 ` Will Deacon

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