From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Ian Campbell <ian.campbell@citrix.com>
Cc: Olaf Hering <olaf@aepfle.de>, Daniel Kiper <dkiper@net-space.pl>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jan Beulich <JBeulich@suse.com>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during kexec boot
Date: Tue, 10 Jul 2012 10:51:10 -0400 [thread overview]
Message-ID: <20120710145110.GA15218@phenom.dumpdata.com> (raw)
In-Reply-To: <1341931594.8586.44.camel@hastur.hellion.org.uk>
On Tue, Jul 10, 2012 at 08:46:34AM -0600, Ian Campbell wrote:
> On Tue, 2012-07-10 at 10:14 -0400, Konrad Rzeszutek Wilk wrote:
> > Which brings me to another question - say we do use this patch, what
> > if the decompressor overwrites the old kernels .data section. Won't
> > we run into this problem again?
>
> I've not really been following this thread that closely but wouldn't the
> right answer be for the original kernel to unmap the shared info on
> kexec? Or maybe remap it up to some high/reserved address? Can it read
That would be the right answer I think, but I don't see the a VCPU_deregister
call (only VCPU_register).
But perhaps the XENMEM_decrease_reservation for the particular MFN is the
answer to do a VCPU "de-register" ?
> the original address used by hvmloader at start of day and reuse that?
Wait, we can map multiple shared_info? Ooh, somehow I thought the guest
could only do one registration.
>
> Ian.
>
WARNING: multiple messages have this Message-ID (diff)
From: Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
Cc: Olaf Hering <olaf-QOLJcTWqO2uzQB+pC5nmwQ@public.gmane.org>,
"xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org"
<xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org>,
"kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Jan Beulich <JBeulich-IBi9RG/b67k@public.gmane.org>,
Daniel Kiper <dkiper-lGfBN0aaEZ+lPcVs/6D9LQ@public.gmane.org>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during kexec boot
Date: Tue, 10 Jul 2012 10:51:10 -0400 [thread overview]
Message-ID: <20120710145110.GA15218@phenom.dumpdata.com> (raw)
In-Reply-To: <1341931594.8586.44.camel-T6UX0E5iMSquecqUINmzht73F7V6hmMc@public.gmane.org>
On Tue, Jul 10, 2012 at 08:46:34AM -0600, Ian Campbell wrote:
> On Tue, 2012-07-10 at 10:14 -0400, Konrad Rzeszutek Wilk wrote:
> > Which brings me to another question - say we do use this patch, what
> > if the decompressor overwrites the old kernels .data section. Won't
> > we run into this problem again?
>
> I've not really been following this thread that closely but wouldn't the
> right answer be for the original kernel to unmap the shared info on
> kexec? Or maybe remap it up to some high/reserved address? Can it read
That would be the right answer I think, but I don't see the a VCPU_deregister
call (only VCPU_register).
But perhaps the XENMEM_decrease_reservation for the particular MFN is the
answer to do a VCPU "de-register" ?
> the original address used by hvmloader at start of day and reuse that?
Wait, we can map multiple shared_info? Ooh, somehow I thought the guest
could only do one registration.
>
> Ian.
>
WARNING: multiple messages have this Message-ID (diff)
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Ian Campbell <ian.campbell@citrix.com>
Cc: Olaf Hering <olaf@aepfle.de>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jan Beulich <JBeulich@suse.com>,
Daniel Kiper <dkiper@net-space.pl>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during kexec boot
Date: Tue, 10 Jul 2012 10:51:10 -0400 [thread overview]
Message-ID: <20120710145110.GA15218@phenom.dumpdata.com> (raw)
In-Reply-To: <1341931594.8586.44.camel@hastur.hellion.org.uk>
On Tue, Jul 10, 2012 at 08:46:34AM -0600, Ian Campbell wrote:
> On Tue, 2012-07-10 at 10:14 -0400, Konrad Rzeszutek Wilk wrote:
> > Which brings me to another question - say we do use this patch, what
> > if the decompressor overwrites the old kernels .data section. Won't
> > we run into this problem again?
>
> I've not really been following this thread that closely but wouldn't the
> right answer be for the original kernel to unmap the shared info on
> kexec? Or maybe remap it up to some high/reserved address? Can it read
That would be the right answer I think, but I don't see the a VCPU_deregister
call (only VCPU_register).
But perhaps the XENMEM_decrease_reservation for the particular MFN is the
answer to do a VCPU "de-register" ?
> the original address used by hvmloader at start of day and reuse that?
Wait, we can map multiple shared_info? Ooh, somehow I thought the guest
could only do one registration.
>
> Ian.
>
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kexec mailing list
kexec@lists.infradead.org
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next prev parent reply other threads:[~2012-07-10 14:59 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-05 21:06 incorrect layout of globals from head_64.S during kexec boot Olaf Hering
2012-07-05 21:06 ` Olaf Hering
2012-07-06 8:29 ` [Xen-devel] " Jan Beulich
2012-07-06 8:29 ` Jan Beulich
2012-07-06 8:29 ` Jan Beulich
2012-07-06 8:41 ` Daniel Kiper
2012-07-06 8:41 ` Daniel Kiper
2012-07-06 8:41 ` Daniel Kiper
2012-07-06 12:07 ` Olaf Hering
2012-07-06 12:07 ` Olaf Hering
2012-07-06 12:56 ` [Xen-devel] " Jan Beulich
2012-07-06 12:56 ` Jan Beulich
2012-07-06 12:56 ` Jan Beulich
2012-07-06 13:31 ` Olaf Hering
2012-07-06 13:31 ` Olaf Hering
2012-07-06 13:31 ` Olaf Hering
2012-07-06 13:53 ` Jan Beulich
2012-07-06 13:53 ` Jan Beulich
2012-07-06 13:53 ` Jan Beulich
2012-07-06 14:14 ` Olaf Hering
2012-07-06 14:14 ` Olaf Hering
2012-07-06 14:50 ` Jan Beulich
2012-07-06 14:50 ` Jan Beulich
2012-07-06 14:50 ` Jan Beulich
2012-07-06 17:29 ` Olaf Hering
2012-07-06 17:29 ` Olaf Hering
2012-07-10 9:33 ` Olaf Hering
2012-07-10 9:33 ` Olaf Hering
2012-07-10 14:14 ` Konrad Rzeszutek Wilk
2012-07-10 14:14 ` Konrad Rzeszutek Wilk
2012-07-10 14:46 ` Ian Campbell
2012-07-10 14:46 ` Ian Campbell
2012-07-10 14:51 ` Konrad Rzeszutek Wilk [this message]
2012-07-10 14:51 ` Konrad Rzeszutek Wilk
2012-07-10 14:51 ` Konrad Rzeszutek Wilk
2012-07-10 15:29 ` Ian Campbell
2012-07-10 15:29 ` Ian Campbell
2012-07-10 15:29 ` Ian Campbell
2012-07-10 15:37 ` Olaf Hering
2012-07-10 15:37 ` Olaf Hering
2012-07-10 15:23 ` Olaf Hering
2012-07-10 15:23 ` Olaf Hering
2012-07-10 17:26 ` Konrad Rzeszutek Wilk
2012-07-10 17:26 ` Konrad Rzeszutek Wilk
2012-07-10 17:26 ` Konrad Rzeszutek Wilk
2012-07-10 18:09 ` Olaf Hering
2012-07-10 18:09 ` Olaf Hering
2012-07-10 18:32 ` Konrad Rzeszutek Wilk
2012-07-10 18:32 ` Konrad Rzeszutek Wilk
2012-07-10 19:08 ` Keir Fraser
2012-07-10 19:08 ` Keir Fraser
2012-07-10 19:08 ` Keir Fraser
2012-07-13 20:20 ` Olaf Hering
2012-07-13 20:20 ` Olaf Hering
2012-07-14 4:54 ` Keir Fraser
2012-07-14 4:54 ` Keir Fraser
2012-07-14 4:54 ` Keir Fraser
2012-07-15 16:06 ` Olaf Hering
2012-07-15 16:06 ` Olaf Hering
2012-07-15 17:17 ` Keir Fraser
2012-07-15 17:17 ` Keir Fraser
2012-07-15 17:17 ` Keir Fraser
2012-07-16 15:46 ` Konrad Rzeszutek Wilk
2012-07-16 15:46 ` Konrad Rzeszutek Wilk
2012-07-17 10:24 ` Olaf Hering
2012-07-17 10:24 ` Olaf Hering
2012-07-17 12:34 ` Olaf Hering
2012-07-17 12:34 ` Olaf Hering
2012-07-06 15:54 ` Daniel Kiper
2012-07-06 15:54 ` Daniel Kiper
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