From: Michael Ellerman <mpe@ellerman.id.au>
To: Scott Wood <scottwood@freescale.com>
Cc: kexec@lists.infradead.org, Simon Horman <horms@verge.net.au>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 2/2] ppc64: Add a flag to tell the kernel it's booting from kexec
Date: Tue, 18 Aug 2015 13:53:11 +1000 [thread overview]
Message-ID: <1439869991.1763.7.camel@ellerman.id.au> (raw)
In-Reply-To: <1439868650.15601.61.camel@freescale.com>
On Mon, 2015-08-17 at 22:30 -0500, Scott Wood wrote:
> On Tue, 2015-08-18 at 12:51 +1000, Michael Ellerman wrote:
> > On Mon, 2015-08-17 at 13:59 -0500, Scott Wood wrote:
> > > On Sat, 2015-07-18 at 14:57 -0500, Scott Wood wrote:
> > > > It needs to know this because the SMP release mechanism for Freescale
> > > > book3e is different from when booting with normal hardware. In theory
> > > > we could simulate the normal spin table mechanism, but not (easily) at
> > > > the addresses U-Boot put in the device tree -- so there'd need to be
> > > > even more communication between the kernel and kexec to set that up.
> > > > Since there's already a similar flag being set (for kdump only), this
> > > > seemed like a reasonable approach.
> > > >
> > > > Signed-off-by: Scott Wood <scottwood@freescale.com>
> > > > ---
> > > > kexec/arch/ppc64/kexec-elf-ppc64.c | 11 ++++++++++-
> > > > kexec/arch/ppc64/kexec-ppc64.h | 2 ++
> > > > purgatory/arch/ppc64/v2wrap.S | 11 +++++++++++
> > > > 3 files changed, 23 insertions(+), 1 deletion(-)
> > >
> > > Any comment on these two patches?
> >
> > We should probably reserve 0x58 in the kernel's head_64.S too?
>
> That's done in http://patchwork.ozlabs.org/patch/497417/
Right, sorry should have reviewed those :)
> Or do you mean that you want the kernel change to go in before the userspace
> change?
No I'm not bothered about the ordering really.
cheers
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WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <mpe@ellerman.id.au>
To: Scott Wood <scottwood@freescale.com>
Cc: Simon Horman <horms@verge.net.au>,
linuxppc-dev@lists.ozlabs.org, kexec@lists.infradead.org
Subject: Re: [PATCH 2/2] ppc64: Add a flag to tell the kernel it's booting from kexec
Date: Tue, 18 Aug 2015 13:53:11 +1000 [thread overview]
Message-ID: <1439869991.1763.7.camel@ellerman.id.au> (raw)
In-Reply-To: <1439868650.15601.61.camel@freescale.com>
On Mon, 2015-08-17 at 22:30 -0500, Scott Wood wrote:
> On Tue, 2015-08-18 at 12:51 +1000, Michael Ellerman wrote:
> > On Mon, 2015-08-17 at 13:59 -0500, Scott Wood wrote:
> > > On Sat, 2015-07-18 at 14:57 -0500, Scott Wood wrote:
> > > > It needs to know this because the SMP release mechanism for Freescale
> > > > book3e is different from when booting with normal hardware. In theory
> > > > we could simulate the normal spin table mechanism, but not (easily) at
> > > > the addresses U-Boot put in the device tree -- so there'd need to be
> > > > even more communication between the kernel and kexec to set that up.
> > > > Since there's already a similar flag being set (for kdump only), this
> > > > seemed like a reasonable approach.
> > > >
> > > > Signed-off-by: Scott Wood <scottwood@freescale.com>
> > > > ---
> > > > kexec/arch/ppc64/kexec-elf-ppc64.c | 11 ++++++++++-
> > > > kexec/arch/ppc64/kexec-ppc64.h | 2 ++
> > > > purgatory/arch/ppc64/v2wrap.S | 11 +++++++++++
> > > > 3 files changed, 23 insertions(+), 1 deletion(-)
> > >
> > > Any comment on these two patches?
> >
> > We should probably reserve 0x58 in the kernel's head_64.S too?
>
> That's done in http://patchwork.ozlabs.org/patch/497417/
Right, sorry should have reviewed those :)
> Or do you mean that you want the kernel change to go in before the userspace
> change?
No I'm not bothered about the ordering really.
cheers
next prev parent reply other threads:[~2015-08-18 3:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-18 19:57 [PATCH 1/2] ppc64: Fix warnings Scott Wood
2015-07-18 19:57 ` Scott Wood
2015-07-18 19:57 ` [PATCH 2/2] ppc64: Add a flag to tell the kernel it's booting from kexec Scott Wood
2015-07-18 19:57 ` Scott Wood
2015-08-17 18:59 ` Scott Wood
2015-08-17 18:59 ` Scott Wood
2015-08-18 2:51 ` Michael Ellerman
2015-08-18 2:51 ` Michael Ellerman
2015-08-18 3:30 ` Scott Wood
2015-08-18 3:30 ` Scott Wood
2015-08-18 3:53 ` Michael Ellerman [this message]
2015-08-18 3:53 ` Michael Ellerman
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