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Re: [Xen-devel] [PATCH 3/4] x86-64: EFI runtime code

To: "Keir Fraser" <keir.xen@xxxxxxxxx>, "Konrad Rzeszutek Wilk" <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 3/4] x86-64: EFI runtime code
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Tue, 28 Jun 2011 08:56:03 +0100
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>>> On 28.06.11 at 09:39, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> On 28/06/2011 08:11, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
>>>>> On 27.06.11 at 18:25, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
>>>>> wrote:
>>> On Mon, Jun 27, 2011 at 11:43:02AM +0100, Jan Beulich wrote:
>>>> This allows Dom0 access to all suitable EFI runtime services. The
>>> What type of patches for the upstream 3.0 kernel are needed to take
>>> advantage of these new hypercalls?
>> I did not put any consideration in how to integrate this with the
>> upstream kernel. For our kernel, I used the *-xen.? mechanism
>> to have a parallel source file to arch/x86/platform/efi/efi.c, and
>> excluded building of arch/x86/platform/efi/efi_stub_*.S and
>> arch/x86/platform/efi/efi_*.c.
>> Patch below for reference.
> Since the new hypercalls are 1:1 replacements for the EFI run-time calls (I
> think?)

Yes, with a few exceptions of things that must not be done from
Dom0 (i.e. the ResetSystem() and SetVirtualAddressMap() ones).

> we could perhaps keep most of Linux's EFI subsystem intact and spoof
> it with a fake operations table containing hypercall stubs.

Indeed, that part ought to be simple. The question is which of the
(luckily few) other code paths need adjustment.


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