linux-kernel - Re: [RFC][PATCH 03/11] x86/mm: Page size aware flush_tlb_mm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 13 Sep 2018 20:46:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     will.deacon@....com, aneesh.kumar@...ux.vnet.ibm.com,
        akpm@...ux-foundation.org, npiggin@...il.com,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        heiko.carstens@...ibm.com
Subject: Re: [RFC][PATCH 03/11] x86/mm: Page size aware flush_tlb_mm_range()

On Thu, Sep 13, 2018 at 08:42:30PM +0200, Peter Zijlstra wrote:
> > > +#define flush_tlb_range(vma, start, end)			\
> > > +		flush_tlb_mm_range((vma)->vm_mm, start, end,	\
> > > +				(vma)->vm_flags & VM_HUGETLB ? PMD_SHIFT : PAGE_SHIFT)
> > 
> > This is safe.  But, Couldn't this PMD_SHIFT also be PUD_SHIFT for a 1G
> > hugetlb page?
> 
> It could be, but can we tell at that point?

I had me a look in higetlb.h, would something like so work?

#define flush_tlb_range(vma, start, end)			\
	flush_tlb_mm_range((vma)->vm_mm, start, end,		\
			   huge_page_shift(hstate_vma(vma)))