linux-kernel - Re: [PATCH] x86/mm: Split read_cr3() into read_cr3_pa() and __read

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Date:   Tue, 13 Jun 2017 08:49:26 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        xen-devel <xen-devel@...ts.xen.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] x86/mm: Split read_cr3() into read_cr3_pa() and
 __read_cr3()


* Andy Lutomirski <luto@...nel.org> wrote:

> The kernel has several code paths that read CR3.  Most of them assume that
> CR3 contains the PGD's physical address, whereas some of them awkwardly
> use PHYSICAL_PAGE_MASK to mask off low bits.
> 
> Add explicit mask macros for CR3 and convert all of the CR3 readers.
> This will keep them from breaking when PCID is enabled.
> 
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: xen-devel <xen-devel@...ts.xen.org>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
> 
> Hi Ingo-
> 
> I broke this out because Tom's SME series and my PCID series both need it.
> Please consider applying it to tip:x86/mm.
> 
> I'll send PCID v2 soon.  It'll apply to x86/mm + sched/urgent + this patch.

Ok, thanks - will push it out after a bit of testing.

Note that I also merged sched/urgent into x86/mm, to create a better base tree for 
the PCID changes by picking up 252d2a4117bc that PCID depends on.

Thanks,

	Ingo