From: Shannon Zhao <zhaoshenglong@huawei.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Daniel Kiper <daniel.kiper@oracle.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Mark Rutland <mark.rutland@arm.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>,
"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>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Mon, 14 Sep 2015 17:31:33 +0800 [thread overview]
Message-ID: <55F693F5.8030203@huawei.com> (raw)
In-Reply-To: <CAKv+Gu-xAAd=xTOh+qZvPDthgbRPLy=YwT4xfi4dS53EgJRh1Q@mail.gmail.com>
On 2015/9/14 17:09, Ard Biesheuvel wrote:
> On 14 September 2015 at 10:42, Shannon Zhao <zhaoshenglong@huawei.com> wrote:
> [..]
>
>>
>> It only needs to apply following patch to fix a bug in Linux kernel when
>> mapping EFI_MEMORY_RUNTIME memory.
>>
>
> Could you explain why you think efi_virtmap_init() should fail if
> there are no EFI_MEMORY_RUNTIME regions?
>
My understanding is that if there are no EFI_MEMORY_RUNTIME regions, it
means we can't use runtime services and should not set the bit
EFI_RUNTIME_SERVICES of efi.flags. But if efi_virtmap_init() return
true, the bit will be set.
> The absence of such regions is allowed by the spec, so
> efi_virtmap_init() is correct imo to return success.
>
Sorry, not well know about the spec. Could you point out where the spec
says this?
> If you are trying to work around the issue where Xen does not expose
> any Runtime Services regions, there is simply no way to do that and be
> still UEFI compliant. I have suggested before that we should perhaps
> tolerate this anyway, by considering the case where the EFI System
> Table has a NULL runtime services pointer. But rigging
> efi_virtmap_init() like this is really not the way to achieve that.
>
--
Shannon
WARNING: multiple messages have this Message-ID (diff)
From: Shannon Zhao <zhaoshenglong@huawei.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
"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>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.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>,
linux-arm-kernel@lists.infradead
Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Mon, 14 Sep 2015 17:31:33 +0800 [thread overview]
Message-ID: <55F693F5.8030203@huawei.com> (raw)
In-Reply-To: <CAKv+Gu-xAAd=xTOh+qZvPDthgbRPLy=YwT4xfi4dS53EgJRh1Q@mail.gmail.com>
On 2015/9/14 17:09, Ard Biesheuvel wrote:
> On 14 September 2015 at 10:42, Shannon Zhao <zhaoshenglong@huawei.com> wrote:
> [..]
>
>>
>> It only needs to apply following patch to fix a bug in Linux kernel when
>> mapping EFI_MEMORY_RUNTIME memory.
>>
>
> Could you explain why you think efi_virtmap_init() should fail if
> there are no EFI_MEMORY_RUNTIME regions?
>
My understanding is that if there are no EFI_MEMORY_RUNTIME regions, it
means we can't use runtime services and should not set the bit
EFI_RUNTIME_SERVICES of efi.flags. But if efi_virtmap_init() return
true, the bit will be set.
> The absence of such regions is allowed by the spec, so
> efi_virtmap_init() is correct imo to return success.
>
Sorry, not well know about the spec. Could you point out where the spec
says this?
> If you are trying to work around the issue where Xen does not expose
> any Runtime Services regions, there is simply no way to do that and be
> still UEFI compliant. I have suggested before that we should perhaps
> tolerate this anyway, by considering the case where the EFI System
> Table has a NULL runtime services pointer. But rigging
> efi_virtmap_init() like this is really not the way to achieve that.
>
--
Shannon
WARNING: multiple messages have this Message-ID (diff)
From: zhaoshenglong@huawei.com (Shannon Zhao)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Mon, 14 Sep 2015 17:31:33 +0800 [thread overview]
Message-ID: <55F693F5.8030203@huawei.com> (raw)
In-Reply-To: <CAKv+Gu-xAAd=xTOh+qZvPDthgbRPLy=YwT4xfi4dS53EgJRh1Q@mail.gmail.com>
On 2015/9/14 17:09, Ard Biesheuvel wrote:
> On 14 September 2015 at 10:42, Shannon Zhao <zhaoshenglong@huawei.com> wrote:
> [..]
>
>>
>> It only needs to apply following patch to fix a bug in Linux kernel when
>> mapping EFI_MEMORY_RUNTIME memory.
>>
>
> Could you explain why you think efi_virtmap_init() should fail if
> there are no EFI_MEMORY_RUNTIME regions?
>
My understanding is that if there are no EFI_MEMORY_RUNTIME regions, it
means we can't use runtime services and should not set the bit
EFI_RUNTIME_SERVICES of efi.flags. But if efi_virtmap_init() return
true, the bit will be set.
> The absence of such regions is allowed by the spec, so
> efi_virtmap_init() is correct imo to return success.
>
Sorry, not well know about the spec. Could you point out where the spec
says this?
> If you are trying to work around the issue where Xen does not expose
> any Runtime Services regions, there is simply no way to do that and be
> still UEFI compliant. I have suggested before that we should perhaps
> tolerate this anyway, by considering the case where the EFI System
> Table has a NULL runtime services pointer. But rigging
> efi_virtmap_init() like this is really not the way to achieve that.
>
--
Shannon
next prev parent reply other threads:[~2015-09-14 9:34 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 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 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 16:10 ` Stefano Stabellini
2015-09-10 16:23 ` Mark Rutland
2015-09-10 16:23 ` Mark Rutland
2015-09-10 16:23 ` Mark Rutland
2015-09-11 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
2015-09-14 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 [this message]
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 15:45 ` Daniel Kiper
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
2015-09-11 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
2015-09-14 10:02 ` Ard Biesheuvel
[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 12:28 ` Daniel Kiper
2015-09-14 12:28 ` Daniel Kiper
2015-09-14 13:09 ` Ard Biesheuvel
[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 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
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
2015-09-10 16:23 ` 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 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 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 12:55 ` Jan Beulich
2015-09-10 11:37 ` 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 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
2015-09-10 12:05 ` Roger Pau Monné
2015-09-10 11:48 ` Julien Grall
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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