From: "H. Peter Anvin" <hpa@zytor.com>
To: Matt Fleming <matt@codeblueprint.co.uk>, Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
Leif Lindholm <leif.lindholm@linaro.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
Matt Fleming <matt.fleming@intel.com>,
Mark Rutland <mark.rutland@arm.com>,
Mark Salter <msalter@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@kernel.org>,
Denys Vlasenko <dvlasenk@redhat.com>,
Brian Gerst <brgerst@gmail.com>
Subject: Re: [PATCH 2/2] arm64/efi: Don't pad between EFI_MEMORY_RUNTIME regions
Date: Tue, 29 Sep 2015 17:56:07 -0700 [thread overview]
Message-ID: <560B3327.9020801@zytor.com> (raw)
In-Reply-To: <20150929143612.GC4401@codeblueprint.co.uk>
On 09/29/2015 07:36 AM, Matt Fleming wrote:
>
> That's a pretty good summary for x86. I think specifically the reason
> we map the EFI memmap entries "backwards" (entry N has higher VA than
> entry N+1) is because the code was easier to write that way, but
> you'll know better than me ;-)
>
There were two reasons:
1. The code was easier to write.
2. Windows did it that way.
Windows apparently broke and was changed due to this feature, too.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Matt Fleming
<matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>,
Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Cc: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Ard Biesheuvel
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Leif Lindholm
<leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
"stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Matt Fleming
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Denys Vlasenko <dvlasenk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Brian Gerst <brgerst-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 2/2] arm64/efi: Don't pad between EFI_MEMORY_RUNTIME regions
Date: Tue, 29 Sep 2015 17:56:07 -0700 [thread overview]
Message-ID: <560B3327.9020801@zytor.com> (raw)
In-Reply-To: <20150929143612.GC4401-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
On 09/29/2015 07:36 AM, Matt Fleming wrote:
>
> That's a pretty good summary for x86. I think specifically the reason
> we map the EFI memmap entries "backwards" (entry N has higher VA than
> entry N+1) is because the code was easier to write that way, but
> you'll know better than me ;-)
>
There were two reasons:
1. The code was easier to write.
2. Windows did it that way.
Windows apparently broke and was changed due to this feature, too.
-hpa
next prev parent reply other threads:[~2015-09-30 0:56 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-25 22:02 [GIT PULL 0/2] EFI urgent fixes Matt Fleming
2015-09-25 22:02 ` Matt Fleming
2015-09-25 22:02 ` [PATCH 1/2] x86/efi: Map EFI memmap entries in-order at runtime Matt Fleming
2015-09-25 22:02 ` Matt Fleming
2015-09-26 5:56 ` Ingo Molnar
2015-09-26 5:56 ` Ingo Molnar
2015-09-26 6:44 ` Ard Biesheuvel
2015-09-26 6:44 ` Ard Biesheuvel
2015-09-26 13:43 ` Matt Fleming
2015-09-27 7:03 ` Ingo Molnar
2015-09-27 7:03 ` Ingo Molnar
2015-09-28 6:49 ` Ard Biesheuvel
2015-09-28 8:22 ` Ingo Molnar
2015-09-28 8:22 ` Ingo Molnar
2015-09-28 9:51 ` Ard Biesheuvel
2015-09-28 9:51 ` Ard Biesheuvel
2015-09-29 9:12 ` Ingo Molnar
2015-09-29 10:41 ` Ard Biesheuvel
2015-09-29 14:18 ` Matt Fleming
2015-09-29 14:18 ` Matt Fleming
2015-09-29 13:52 ` Matt Fleming
2015-09-29 13:52 ` Matt Fleming
2015-09-26 17:01 ` Andy Lutomirski
2015-09-26 17:01 ` Andy Lutomirski
2015-09-26 17:20 ` H. Peter Anvin
2015-09-26 18:15 ` Ard Biesheuvel
2015-09-26 18:15 ` Ard Biesheuvel
2015-09-26 19:49 ` H. Peter Anvin
2015-09-26 19:57 ` Matt Fleming
2015-09-26 20:09 ` Ard Biesheuvel
2015-09-26 20:09 ` Ard Biesheuvel
2015-09-26 20:19 ` H. Peter Anvin
2015-09-27 16:30 ` Andy Lutomirski
2015-09-27 18:06 ` Matthew Garrett
2015-09-27 18:06 ` Matthew Garrett
2015-09-28 6:16 ` Ingo Molnar
2015-09-28 6:16 ` Ingo Molnar
2015-09-28 6:41 ` Matthew Garrett
2015-09-29 21:58 ` Laszlo Ersek
2015-09-29 21:58 ` Laszlo Ersek
2015-09-30 9:30 ` Ard Biesheuvel
2015-09-30 16:43 ` Andy Lutomirski
2015-09-30 16:43 ` Andy Lutomirski
2015-09-30 17:24 ` James Bottomley
2015-09-30 17:24 ` James Bottomley
2015-09-30 17:24 ` James Bottomley
2015-09-30 0:54 ` H. Peter Anvin
2015-09-30 0:54 ` H. Peter Anvin
2015-09-26 19:55 ` Matt Fleming
2015-09-26 19:55 ` Matt Fleming
2015-09-27 6:50 ` Ingo Molnar
2015-10-01 12:48 ` [tip:core/urgent] x86/efi: Fix boot crash by mapping EFI memmap entries bottom-up at runtime, instead of top-down tip-bot for Matt Fleming
2015-10-02 9:44 ` Matt Fleming
2015-09-25 22:02 ` [PATCH 2/2] arm64/efi: Don't pad between EFI_MEMORY_RUNTIME regions Matt Fleming
2015-09-25 22:02 ` Matt Fleming
2015-09-26 6:01 ` Ingo Molnar
2015-09-26 6:01 ` Ingo Molnar
2015-09-26 7:08 ` Ard Biesheuvel
2015-09-26 7:08 ` Ard Biesheuvel
2015-09-27 7:06 ` Ingo Molnar
2015-09-27 7:06 ` Ingo Molnar
2015-09-27 10:40 ` Borislav Petkov
2015-09-28 6:20 ` Ingo Molnar
2015-09-29 9:31 ` Dave Young
2015-09-29 10:24 ` Borislav Petkov
2015-09-29 14:36 ` Matt Fleming
2015-09-29 14:36 ` Matt Fleming
2015-09-30 0:56 ` H. Peter Anvin [this message]
2015-09-30 0:56 ` H. Peter Anvin
2015-09-30 8:33 ` Borislav Petkov
2015-09-30 8:33 ` Borislav Petkov
2015-09-30 1:03 ` H. Peter Anvin
2015-09-30 1:16 ` Andy Lutomirski
2015-09-30 1:19 ` H. Peter Anvin
2015-09-30 4:24 ` Ard Biesheuvel
2015-09-30 4:24 ` Ard Biesheuvel
2015-10-01 10:44 ` Ingo Molnar
2015-10-01 12:49 ` [tip:core/urgent] arm64/efi: Fix boot crash by not padding " tip-bot for Ard Biesheuvel
-- strict thread matches above, loose matches on Subject: below --
2015-06-30 10:17 [PATCH 0/2] arm64/efi: adapt to UEFI 2.5 properties table changes Ard Biesheuvel
[not found] ` <1435659443-17625-1-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2015-06-30 10:17 ` [PATCH 2/2] arm64/efi: don't pad between EFI_MEMORY_RUNTIME regions Ard Biesheuvel
2015-06-30 10:17 ` Ard Biesheuvel
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