From: Mark Rutland <mark.rutland@arm.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Shannon Zhao <zhaoshenglong@huawei.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"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>,
"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
"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>,
"julien.grall@citrix.com" <julien.grall@citrix.com>,
"freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>,
"matt.fleming@intel.com" <matt.fleming@intel.com>,
"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>,
"jbeulich@suse.com" <jbeulich@suse.com>,
"peter.huangpeng@huawei.com" <peter.huangpeng@huawei.com>,
"shannon.zhao@linaro.org" <shannon.zhao@linaro.org>
Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 12:24:19 +0100 [thread overview]
Message-ID: <20150910112418.GC29293@leverpostej> (raw)
In-Reply-To: <alpine.DEB.2.02.1509101116580.2672@kaball.uk.xensource.com>
> > Does Xen not talk to EFI itself and/or give the kernel a virtual EFI
> > interface?
>
> Xen talks to EFI itself but the interface provided to dom0 is somewhat
> different: there are no BootServices (Xen calls ExitBootServices before
> running the kernel), and the RuntimeServices go via hypercalls (see
> drivers/xen/efi.c).
That's somewhat hideous; a non Xen-aware OS wouild presumably die if
trying to use any runtime services the normal way? I'm not keen on
describing things that the OS cannot use.
Why can't Xen give a virtual EFI interface to Dom0 / guests? e.g.
create pages of RuntimeServicesCode that are trivial assembly shims
doing hypercalls, and plumb these into the virtual EFI memory map and
tables?
That would keep things sane for any guest, allow for easy addition of
EFI features, and you could even enter the usual EFI entry point,
simulate ExitBootServices(), SetVirtualAddressMap(), and allow the guest
to make things sane for itself...
Mark.
WARNING: multiple messages have this Message-ID (diff)
From: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
To: Stefano Stabellini
<stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>
Cc: Shannon Zhao
<zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Ian.Campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org"
<Ian.Campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
"linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org"
<xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org>,
"julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org"
<julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
"freebsd-arm-h+KGxgPPiopAfugRpC6u6w@public.gmane.org"
<freebsd-arm-h+KGxgPPiopAfugRpC6u6w@public.gmane.org>,
"matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org"
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"jbeulich-IBi9RG/b67k@public.gmane.org"
<jbeulich-IBi9RG/b67k@public.gmane.org>,
"peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org"
<peter.huangpeng@>
Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 12:24:19 +0100 [thread overview]
Message-ID: <20150910112418.GC29293@leverpostej> (raw)
In-Reply-To: <alpine.DEB.2.02.1509101116580.2672-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org>
> > Does Xen not talk to EFI itself and/or give the kernel a virtual EFI
> > interface?
>
> Xen talks to EFI itself but the interface provided to dom0 is somewhat
> different: there are no BootServices (Xen calls ExitBootServices before
> running the kernel), and the RuntimeServices go via hypercalls (see
> drivers/xen/efi.c).
That's somewhat hideous; a non Xen-aware OS wouild presumably die if
trying to use any runtime services the normal way? I'm not keen on
describing things that the OS cannot use.
Why can't Xen give a virtual EFI interface to Dom0 / guests? e.g.
create pages of RuntimeServicesCode that are trivial assembly shims
doing hypercalls, and plumb these into the virtual EFI memory map and
tables?
That would keep things sane for any guest, allow for easy addition of
EFI features, and you could even enter the usual EFI entry point,
simulate ExitBootServices(), SetVirtualAddressMap(), and allow the guest
to make things sane for itself...
Mark.
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WARNING: multiple messages have this Message-ID (diff)
From: mark.rutland@arm.com (Mark Rutland)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 12:24:19 +0100 [thread overview]
Message-ID: <20150910112418.GC29293@leverpostej> (raw)
In-Reply-To: <alpine.DEB.2.02.1509101116580.2672@kaball.uk.xensource.com>
> > Does Xen not talk to EFI itself and/or give the kernel a virtual EFI
> > interface?
>
> Xen talks to EFI itself but the interface provided to dom0 is somewhat
> different: there are no BootServices (Xen calls ExitBootServices before
> running the kernel), and the RuntimeServices go via hypercalls (see
> drivers/xen/efi.c).
That's somewhat hideous; a non Xen-aware OS wouild presumably die if
trying to use any runtime services the normal way? I'm not keen on
describing things that the OS cannot use.
Why can't Xen give a virtual EFI interface to Dom0 / guests? e.g.
create pages of RuntimeServicesCode that are trivial assembly shims
doing hypercalls, and plumb these into the virtual EFI memory map and
tables?
That would keep things sane for any guest, allow for easy addition of
EFI features, and you could even enter the usual EFI entry point,
simulate ExitBootServices(), SetVirtualAddressMap(), and allow the guest
to make things sane for itself...
Mark.
next prev parent reply other threads:[~2015-09-10 11:24 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 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 10:19 ` Stefano Stabellini
2015-09-10 11:24 ` Mark Rutland
2015-09-10 11:24 ` Mark Rutland [this message]
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 ` [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 ` 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 13:08 ` Jan Beulich
2015-09-10 12:58 ` 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 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 13:14 ` 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 ` Ard Biesheuvel
2015-09-14 11:16 ` Ard Biesheuvel
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` [Xen-devel] " Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:16 ` Ard Biesheuvel
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 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 9:25 ` 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
2015-09-14 12:28 ` Daniel Kiper
[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 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
2015-09-14 12:19 ` Daniel Kiper
2015-09-14 12:19 ` Daniel Kiper
2015-09-14 12:19 ` Daniel Kiper
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 13:52 ` 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 11:32 ` Andrew Turner
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 12:05 ` Roger Pau Monné
2015-09-10 12:53 ` Julien Grall
2015-09-10 12:53 ` [Xen-devel] " Julien Grall
2015-09-10 12:53 ` Julien Grall
2015-09-10 12:53 ` Julien Grall
2015-09-17 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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