From: Daniel Kiper <daniel.kiper@oracle.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"leif.lindholm@linaro.org" <leif.lindholm@linaro.org>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
"freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>,
"matt.fleming@intel.com" <matt.fleming@intel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"jbeulich@suse.com" <jbeulich@suse.com>,
Shannon Zhao <zhaoshenglong@huawei.com>,
"julien.grall@citrix.com" <julien.grall@citrix.com>,
"peter.huangpeng@huawei.com" <peter.huangpeng@huawei.>
Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Mon, 14 Sep 2015 14:19:36 +0200 [thread overview]
Message-ID: <20150914121936.GH4530__35612.1798664846$1442233325$gmane$org@olila.local.net-space.pl> (raw)
In-Reply-To: <20150914092518.GA10307@leverpostej>
On Mon, Sep 14, 2015 at 10:25:19AM +0100, Mark Rutland wrote:
> On Sat, Sep 12, 2015 at 12:36:55PM +0100, Daniel Kiper wrote:
> > On Fri, Sep 11, 2015 at 05:25:59PM +0100, Mark Rutland wrote:
> > > On Fri, Sep 11, 2015 at 01:46:43PM +0100, Daniel Kiper wrote:
> > > > On Thu, Sep 10, 2015 at 05:23:02PM +0100, Mark Rutland wrote:
> >
> > [...]
> >
> > > > > What's troublesome with the boot services?
> > > > >
> > > > > What can't be simulated?
> > > >
> > > > How do you want to access bare metal EFI boot services from dom0 if they
> > > > were shutdown long time ago before loading dom0 image?
> > >
> > > I don't want to.
> > >
> > > I asked "What can't be simulated?" because I assumed everything
> > > necessary/mandatory could be simulated without needinng access to any
> > > real EFI boot services.
> > >
> > > As far as I can see all that's necessary is to provide a compatible
> > > interface.
> >
> > Could you be more precise what do you need? Please enumerate. UEFI spec has
> > more than 2500 pages and I do not think that we need all stuff in dom0.
> >
> > > > What do you need from EFI boot services in dom0?
> > >
> > > The ability to call ExitBootServices() and SetVirtualAddressMap() on a
> > > _virtual_ address map for _virtual_ services provided by the hypervisor.
> >
> > I am confused. Why do you need that? Please remember, EFI is owned and
> > operated by Xen hypervisor. dom0 does not have direct access to EFI.
>
> Let's take a step back.
>
> My objection here is to passing the Dom0 kernel properties as if it were
> booted with direct access to a full UEFI, then later fixing that up
> (when Xen is detected and we apply its hypercall EFI implementation).
>
> If the kernel cannot use EFI natively, why pretend to the kernel that it
> can? The hypercall implementation is _not_ EFI (though it provides
> access to some services).
>
> The two ways I can see providing Dom0 with EFI services are:
>
> * Have Xen create shims for any services, in which any hypercalls live,
> and pass these to the kernel with a virtual system table. This keeps
> the interface to the kernel the same regardless of Xen.
>
> * Have the kernel detect Xen EFI capability via Xen, without passing the
> usual native EFI parameters. This can then be installed into the
> kernel in a Xen-specific manner, and we know from the outset that
> Xen-specific caveats apply.
It works on x86 in that way and I suppose that it can work in that way on ARM too.
So, just go and reuse existing code. That is all.
Daniel
next prev parent reply other threads:[~2015-09-14 12:19 UTC|newest]
Thread overview: 182+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-10 8:41 [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao
2015-09-10 8:41 ` Shannon Zhao
2015-09-10 8:41 ` Shannon Zhao
2015-09-10 9:52 ` Mark Rutland
2015-09-10 9:52 ` Mark Rutland
2015-09-10 9:52 ` Mark Rutland
2015-09-10 10:19 ` Stefano Stabellini
2015-09-10 10:19 ` Stefano Stabellini
2015-09-10 10:19 ` Stefano Stabellini
2015-09-10 11:24 ` Mark Rutland
2015-09-10 11:24 ` Mark Rutland
2015-09-10 11:24 ` Mark Rutland
2015-09-10 11:24 ` Mark Rutland
2015-09-10 11:37 ` Stefano Stabellini
2015-09-10 11:37 ` Stefano Stabellini
2015-09-10 11:37 ` Stefano Stabellini
2015-09-10 11:37 ` Stefano Stabellini
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:58 ` Ian Campbell
2015-09-10 12:58 ` [Xen-devel] " Ian Campbell
2015-09-10 12:58 ` Ian Campbell
2015-09-10 12:58 ` Ian Campbell
2015-09-10 13:08 ` Jan Beulich
2015-09-10 13:08 ` [Xen-devel] " Jan Beulich
2015-09-10 13:08 ` Jan Beulich
2015-09-10 13:08 ` Jan Beulich
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:52 ` Stefano Stabellini
2015-09-10 13:52 ` Stefano Stabellini
2015-09-10 13:52 ` Stefano Stabellini
2015-09-10 13:52 ` Stefano Stabellini
2015-09-10 14:13 ` Leif Lindholm
2015-09-10 14:13 ` Leif Lindholm
2015-09-10 14:13 ` Leif Lindholm
2015-09-10 14:13 ` Leif Lindholm
2015-09-10 14:49 ` Mark Rutland
2015-09-10 14:49 ` Mark Rutland
2015-09-10 14:49 ` Mark Rutland
2015-09-10 14:49 ` Mark Rutland
2015-09-10 16:10 ` Stefano Stabellini
2015-09-10 16:10 ` Stefano Stabellini
2015-09-10 16:10 ` Stefano Stabellini
2015-09-10 16:23 ` Mark Rutland
2015-09-10 16:23 ` Mark Rutland
2015-09-10 16:23 ` Mark Rutland
2015-09-10 16:23 ` Mark Rutland
2015-09-11 12:46 ` Daniel Kiper
2015-09-11 12:46 ` Daniel Kiper
2015-09-11 12:46 ` Daniel Kiper
2015-09-11 12:46 ` Daniel Kiper
2015-09-11 13:14 ` Stefano Stabellini
2015-09-11 13:14 ` Stefano Stabellini
2015-09-11 13:14 ` Stefano Stabellini
2015-09-11 13:30 ` Ard Biesheuvel
2015-09-11 13:30 ` Ard Biesheuvel
2015-09-11 13:30 ` Ard Biesheuvel
2015-09-11 15:45 ` Daniel Kiper
2015-09-11 15:45 ` Daniel Kiper
2015-09-11 15:45 ` Daniel Kiper
2015-09-11 15:45 ` Daniel Kiper
2015-09-14 8:42 ` Shannon Zhao
2015-09-14 8:42 ` Shannon Zhao
2015-09-14 8:42 ` Shannon Zhao
2015-09-14 9:09 ` Ard Biesheuvel
2015-09-14 9:09 ` Ard Biesheuvel
2015-09-14 9:09 ` Ard Biesheuvel
2015-09-14 9:09 ` Ard Biesheuvel
2015-09-14 9:31 ` Shannon Zhao
2015-09-14 9:31 ` Shannon Zhao
2015-09-14 9:31 ` Shannon Zhao
2015-09-14 9:36 ` Ard Biesheuvel
2015-09-14 9:36 ` Ard Biesheuvel
2015-09-14 9:36 ` Ard Biesheuvel
2015-09-14 9:36 ` Ard Biesheuvel
2015-09-14 10:39 ` Jan Beulich
2015-09-14 10:39 ` [Xen-devel] " Jan Beulich
2015-09-14 10:39 ` Jan Beulich
2015-09-14 10:39 ` Jan Beulich
2015-09-14 11:16 ` Ard Biesheuvel
2015-09-14 11:16 ` [Xen-devel] " Ard Biesheuvel
2015-09-14 11:16 ` Ard Biesheuvel
2015-09-14 11:16 ` Ard Biesheuvel
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-11 16:33 ` Mark Rutland
2015-09-11 16:33 ` Mark Rutland
2015-09-11 16:33 ` Mark Rutland
2015-09-11 16:33 ` Mark Rutland
2015-09-11 13:30 ` Ard Biesheuvel
2015-09-11 13:14 ` Stefano Stabellini
2015-09-11 16:25 ` Mark Rutland
2015-09-11 16:25 ` Mark Rutland
2015-09-11 16:25 ` Mark Rutland
2015-09-12 11:36 ` Daniel Kiper
2015-09-12 11:36 ` Daniel Kiper
2015-09-12 11:36 ` Daniel Kiper
2015-09-14 9:25 ` Mark Rutland
2015-09-14 9:25 ` Mark Rutland
2015-09-14 9:25 ` Mark Rutland
2015-09-14 9:43 ` Ard Biesheuvel
2015-09-14 9:43 ` Ard Biesheuvel
2015-09-14 9:43 ` Ard Biesheuvel
2015-09-14 9:57 ` Ian Campbell
[not found] ` <CAKv+Gu9ER1cKvPHobq-wo7ggPesJj4OQ7=aTr24GVpubHvVqjQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-14 9:57 ` Ian Campbell
2015-09-14 9:57 ` Ian Campbell
[not found] ` <1442224673.3549.131.camel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
2015-09-14 10:02 ` Ard Biesheuvel
2015-09-14 10:02 ` Ard Biesheuvel
2015-09-14 10:25 ` Ian Campbell
[not found] ` <CAKv+Gu_Gh649EwdtodLY9Q28JhqYg8o6RShXXH1ZbxsfYRfi2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-14 10:25 ` Ian Campbell
2015-09-14 10:25 ` Ian Campbell
2015-09-14 10:02 ` Ard Biesheuvel
2015-09-14 12:28 ` Daniel Kiper
2015-09-14 12:28 ` Daniel Kiper
[not found] ` <20150914122858.GI4530-fJNZiO034lp9pOct4yEdx/3oZC3j2Omk@public.gmane.org>
2015-09-14 13:09 ` Ard Biesheuvel
2015-09-14 13:09 ` Ard Biesheuvel
[not found] ` <CAKv+Gu_z2X=9-qgoKTS7dKLqtSUvysyu9LzZryJqcSR4X8Ss6A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-09-14 13:57 ` Daniel Kiper
2015-09-14 13:57 ` Daniel Kiper
2015-09-14 13:57 ` Daniel Kiper
2015-09-14 13:09 ` Ard Biesheuvel
2015-09-14 12:28 ` Daniel Kiper
2015-09-14 9:47 ` Stefano Stabellini
2015-09-14 9:47 ` Stefano Stabellini
2015-09-14 9:47 ` Stefano Stabellini
2015-09-14 9:47 ` Stefano Stabellini
2015-09-14 12:19 ` Daniel Kiper [this message]
2015-09-14 12:19 ` Daniel Kiper
2015-09-14 12:19 ` Daniel Kiper
2015-09-14 12:19 ` Daniel Kiper
2015-09-14 9:25 ` Mark Rutland
2015-09-12 11:36 ` Daniel Kiper
2015-09-11 16:25 ` Mark Rutland
2015-09-11 11:00 ` Ian Campbell
2015-09-11 11:00 ` Ian Campbell
2015-09-11 11:00 ` Ian Campbell
2015-09-11 11:00 ` Ian Campbell
2015-09-10 16:10 ` Stefano Stabellini
2015-09-10 12:55 ` Jan Beulich
2015-09-10 12:55 ` Jan Beulich
2015-09-10 12:55 ` Jan Beulich
2015-09-10 12:55 ` Jan Beulich
2015-09-10 14:53 ` Mark Rutland
2015-09-10 14:53 ` Mark Rutland
2015-09-10 14:53 ` Mark Rutland
2015-09-10 15:06 ` Jan Beulich
2015-09-10 15:06 ` Jan Beulich
2015-09-10 15:06 ` Jan Beulich
2015-09-10 15:06 ` Jan Beulich
2015-09-11 16:36 ` Mark Rutland
2015-09-11 16:36 ` Mark Rutland
2015-09-11 16:36 ` Mark Rutland
2015-09-11 16:36 ` Mark Rutland
2015-09-10 10:19 ` Stefano Stabellini
2015-09-10 9:52 ` Mark Rutland
2015-09-10 11:32 ` Andrew Turner
2015-09-10 11:32 ` Andrew Turner
2015-09-10 11:32 ` Andrew Turner
2015-09-10 11:48 ` Julien Grall
2015-09-10 11:48 ` Julien Grall
2015-09-10 11:48 ` Julien Grall
2015-09-10 11:48 ` Julien Grall
2015-09-10 12:05 ` Roger Pau Monné
2015-09-10 12:05 ` Roger Pau Monné
2015-09-10 12:05 ` Roger Pau Monné
2015-09-10 12:53 ` [Xen-devel] " Julien Grall
2015-09-10 12:53 ` Julien Grall
2015-09-10 12:53 ` Julien Grall
2015-09-10 12:53 ` Julien Grall
2015-09-10 12:05 ` Roger Pau Monné
2015-09-10 11:32 ` Andrew Turner
2015-09-17 11:43 ` Shannon Zhao
2015-09-17 11:43 ` Shannon Zhao
2015-09-17 11:43 ` Shannon Zhao
2015-09-17 11:43 ` Shannon Zhao
-- strict thread matches above, loose matches on Subject: below --
2015-09-10 8:41 Shannon Zhao
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