From: Pavel Tatashin <pasha.tatashin@oracle.com>
To: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
catalin.marinas@arm.com, linux-kernel@vger.kernel.org,
sparclinux@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org,
kasan-dev@googlegroups.com, borntraeger@de.ibm.com,
heiko.carstens@de.ibm.com, davem@davemloft.net,
willy@infradead.org, mhocko@kernel.org,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
sam@ravnborg.org, mgorman@techsingularity.net,
Steve Sistare <steven.sistare@oracle.com>,
daniel.m.jordan@oracle.com, bob.picco@oracle.com
Subject: Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function
Date: Mon, 9 Oct 2017 15:07:01 -0400 [thread overview]
Message-ID: <CAOAebxvcg9r00bCWDJS4V_mmKk_dELVs_SfxqrxemDg7=uZx_g@mail.gmail.com> (raw)
In-Reply-To: <20171009190213.GF30828@arm.com>
>
> Ok, but I'm still missing why you think that is needed. What would be the
> second page table walker that needs implementing?
>
> I guess we could implement that on arm64 using our current vmemmap_populate
> logic and an explicit memset.
>
Hi Will,
What do you mean by explicit memset()? We can't simply memset() from
start to end without doing the page table walk, because at the time
kasan is calling vmemmap_populate() we have a tmp_pg_dir instead of
swapper_pg_dir.
We could do the explicit memset() after
cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); but again, this was in
one of my previous implementations, and I was asked to replace that.
Pavel
next prev parent reply other threads:[~2017-10-09 19:07 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-20 20:17 [PATCH v9 00/12] complete deferred page initialization Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 01/12] x86/mm: setting fields in deferred pages Pavel Tatashin
2017-10-03 12:26 ` Michal Hocko
2017-10-03 15:07 ` Pasha Tatashin
2017-09-20 20:17 ` [PATCH v9 02/12] sparc64/mm: " Pavel Tatashin
2017-10-03 12:28 ` Michal Hocko
2017-10-03 15:10 ` Pasha Tatashin
2017-09-20 20:17 ` [PATCH v9 03/12] mm: deferred_init_memmap improvements Pavel Tatashin
2017-10-03 12:57 ` Michal Hocko
2017-10-03 15:15 ` Pasha Tatashin
2017-10-03 16:01 ` Pasha Tatashin
2017-10-04 8:48 ` Michal Hocko
2017-09-20 20:17 ` [PATCH v9 04/12] sparc64: simplify vmemmap_populate Pavel Tatashin
2017-10-03 12:59 ` Michal Hocko
2017-10-03 15:20 ` Pasha Tatashin
2017-09-20 20:17 ` [PATCH v9 05/12] mm: defining memblock_virt_alloc_try_nid_raw Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 06/12] mm: zero struct pages during initialization Pavel Tatashin
2017-10-03 13:08 ` Michal Hocko
2017-10-03 15:22 ` Pasha Tatashin
2017-10-04 8:45 ` Michal Hocko
2017-10-04 12:26 ` Pasha Tatashin
2017-09-20 20:17 ` [PATCH v9 07/12] sparc64: optimized struct page zeroing Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 08/12] mm: zero reserved and unavailable struct pages Pavel Tatashin
2017-10-03 13:18 ` Michal Hocko
2017-10-03 15:29 ` Pasha Tatashin
2017-10-04 8:56 ` Michal Hocko
2017-10-04 12:40 ` Pasha Tatashin
2017-10-04 12:57 ` Michal Hocko
2017-10-04 13:28 ` Pasha Tatashin
2017-10-04 14:04 ` Michal Hocko
2017-10-04 15:08 ` Pasha Tatashin
2017-09-20 20:17 ` [PATCH v9 09/12] mm/kasan: kasan specific map populate function Pavel Tatashin
2017-10-03 14:48 ` Mark Rutland
2017-10-03 15:04 ` Pasha Tatashin
2017-10-09 17:13 ` Will Deacon
2017-10-09 17:51 ` Pavel Tatashin
2017-10-09 18:14 ` Michal Hocko
2017-10-09 18:48 ` Will Deacon
2017-10-09 18:22 ` Will Deacon
2017-10-09 18:42 ` Pavel Tatashin
2017-10-09 18:48 ` Will Deacon
2017-10-09 18:59 ` Pavel Tatashin
2017-10-09 19:02 ` Will Deacon
2017-10-09 19:07 ` Pavel Tatashin [this message]
2017-10-09 19:57 ` Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 10/12] x86/kasan: use kasan_map_populate() Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 11/12] arm64/kasan: " Pavel Tatashin
2017-09-20 20:17 ` [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap Pavel Tatashin
2017-10-03 13:19 ` Michal Hocko
2017-10-03 15:34 ` Pasha Tatashin
2017-10-03 20:26 ` Pasha Tatashin
2017-10-04 8:45 ` Michal Hocko
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