linux-kernel - RE: [PATCH 4.4 05/27] x86/efi: Build our own page table structures

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Date:   Tue, 12 Dec 2017 17:24:32 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Borislav Petkov <bp@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        "Andy Lutomirski" <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Dave Jones <davej@...emonkey.org.uk>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Toshi Kani <toshi.kani@...com>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alex Thorlton <athorlton@....com>
Subject: RE: [PATCH 4.4 05/27] x86/efi: Build our own page table structures

> -----Original Message-----
> From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org]
> Sent: Sunday, December 10, 2017 4:27 PM
> To: Ben Hutchings <ben.hutchings@...ethink.co.uk>; Ghannam, Yazen
> <Yazen.Ghannam@....com>
> Cc: linux-kernel@...r.kernel.org; stable@...r.kernel.org; Matt Fleming
> <matt@...eblueprint.co.uk>; Borislav Petkov <bp@...e.de>; Andrew
> Morton <akpm@...ux-foundation.org>; Andy Lutomirski
> <luto@...capital.net>; Andy Lutomirski <luto@...nel.org>; Ard Biesheuvel
> <ard.biesheuvel@...aro.org>; Borislav Petkov <bp@...en8.de>; Brian Gerst
> <brgerst@...il.com>; Dave Jones <davej@...emonkey.org.uk>; Denys
> Vlasenko <dvlasenk@...hat.com>; H. Peter Anvin <hpa@...or.com>; Linus
> Torvalds <torvalds@...ux-foundation.org>; Peter Zijlstra
> <peterz@...radead.org>; Sai Praneeth Prakhya
> <sai.praneeth.prakhya@...el.com>; Stephen Smalley <sds@...ho.nsa.gov>;
> Thomas Gleixner <tglx@...utronix.de>; Toshi Kani <toshi.kani@...com>;
> linux-efi@...r.kernel.org; Ingo Molnar <mingo@...nel.org>; Ghannam,
> Yazen <Yazen.Ghannam@....com>; Alex Thorlton <athorlton@....com>
> Subject: Re: [PATCH 4.4 05/27] x86/efi: Build our own page table structures
> 
> On Thu, Dec 07, 2017 at 10:43:49PM +0000, Ben Hutchings wrote:
> > On Mon, 2017-12-04 at 16:59 +0100, Greg Kroah-Hartman wrote:
> > > 4.4-stable review patch.  If anyone has any objections, please let me
> know.
> > >
> > > ------------------
> > >
> > > From: Matt Fleming <matt@...eblueprint.co.uk>
> > >
> > > commit 67a9108ed4313b85a9c53406d80dc1ae3f8c3e36 upstream.
> > [...]
> >
> > It looks like this will cause regressions unless you also apply:
> >
> > 21cdb6b56843 x86/mm: Page align the '_end' symbol to avoid pfn
> conversion bugs
> > b61a76f8850d x86/efi: Map RAM into the identity page table for mixed
> mode
> > 753b11ef8e92 x86/efi: Setup separate EFI page tables in kexec paths
> >
> > and possibly also:
> >
> > 08914f436bdd x86/platform/UV: Bring back the call to map_low_mmrs in
> uv_system_init
> > 683ad8092cd2 x86/efi: Fix 7-parameter efi_call()s
> > 80e75596079f efi: Convert efi_call_virt() to efi_call_virt_pointer()
> > d1be84a232e3 x86/uv: Update uv_bios_call() to use efi_call_virt_pointer()
> 
> Ugh, that's a mess.  Yazen is the one who reported this patch, and 2
> others, were needed to resolve an issue on their hardware.
> 
> Yazen, any thoughts here?  Should I just revert the 3 patches, or do you
> also feel I need all 7 of these to ensure everything works properly?
> 

I think it's okay to revert the 3 patches.

Thanks,
Yazen