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

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Date:   Sun, 10 Dec 2017 22:26:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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?

thanks,

greg k-h