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From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Marco Elver <elver@google.com>,
	Evgenii Stepanov <eugenis@google.com>,
	Branislav Rankov <Branislav.Rankov@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	kasan-dev <kasan-dev@googlegroups.com>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Linux Memory Management List <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE
Date: Thu, 5 Nov 2020 18:29:17 +0100	[thread overview]
Message-ID: <CAAeHK+x0pQyQFG9e9HRxW5p8AYamPFmP-mKpHDWTwL_XUq7msA@mail.gmail.com> (raw)
In-Reply-To: <20201105172549.GE30030@gaia>

On Thu, Nov 5, 2020 at 6:26 PM Catalin Marinas <catalin.marinas@arm.com> wrote:
>
> On Thu, Nov 05, 2020 at 12:18:45AM +0100, Andrey Konovalov wrote:
> > diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
> > index 06ba6c923ab7..fcfbefcc3174 100644
> > --- a/arch/arm64/kernel/mte.c
> > +++ b/arch/arm64/kernel/mte.c
> > @@ -121,6 +121,13 @@ void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag)
> >       return ptr;
> >  }
> >
> > +void __init mte_init_tags(u64 max_tag)
> > +{
> > +     /* Enable MTE Sync Mode for EL1. */
> > +     sysreg_clear_set(sctlr_el1, SCTLR_ELx_TCF_MASK, SCTLR_ELx_TCF_SYNC);
> > +     isb();
> > +}
>
> Is this going to be called on each CPU? I quickly went through the rest
> of the patches and couldn't see how.

Yes, on each CPU. This is done via kasan_init_hw_tags() that is called
from cpu_enable_mte(). This change is added in the "kasan, arm64:
implement HW_TAGS runtime". Would it make sense to put it into a
separate patch?

  reply	other threads:[~2020-11-05 17:29 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-04 23:18 [PATCH v8 00/43] kasan: add hardware tag-based mode for arm64 Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 01/43] kasan: drop unnecessary GPL text from comment headers Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 02/43] kasan: KASAN_VMALLOC depends on KASAN_GENERIC Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 03/43] kasan: group vmalloc code Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 04/43] s390/kasan: include asm/page.h from asm/kasan.h Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 05/43] kasan: shadow declarations only for software modes Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 06/43] kasan: rename (un)poison_shadow to (un)poison_memory Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 07/43] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 08/43] kasan: only build init.c for software modes Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 09/43] kasan: split out shadow.c from common.c Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 10/43] kasan: define KASAN_GRANULE_PAGE Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 11/43] kasan: rename report and tags files Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 12/43] kasan: don't duplicate config dependencies Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 13/43] kasan: hide invalid free check implementation Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 14/43] kasan: decode stack frame only with KASAN_STACK_ENABLE Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 15/43] kasan, arm64: only init shadow for software modes Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 16/43] kasan, arm64: only use kasan_depth " Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 17/43] kasan, arm64: move initialization message Andrey Konovalov
2020-11-05 15:59   ` Catalin Marinas
2020-11-04 23:18 ` [PATCH v8 18/43] kasan, arm64: rename kasan_init_tags and mark as __init Andrey Konovalov
2020-11-05 16:00   ` Catalin Marinas
2020-11-04 23:18 ` [PATCH v8 19/43] kasan: rename addr_has_shadow to addr_has_metadata Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 20/43] kasan: rename print_shadow_for_address to print_memory_metadata Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 21/43] kasan: kasan_non_canonical_hook only for software modes Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 22/43] kasan: rename SHADOW layout macros to META Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 23/43] kasan: separate metadata_fetch_row for each mode Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 24/43] kasan, arm64: don't allow SW_TAGS with ARM64_MTE Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 25/43] kasan: introduce CONFIG_KASAN_HW_TAGS Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 26/43] arm64: Enable armv8.5-a asm-arch option Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 27/43] arm64: mte: Add in-kernel MTE helpers Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 28/43] arm64: mte: Reset the page tag in page->flags Andrey Konovalov
2020-11-05 15:59   ` Catalin Marinas
2020-11-06 11:46     ` Vincenzo Frascino
2020-11-04 23:18 ` [PATCH v8 29/43] arm64: mte: Add in-kernel tag fault handler Andrey Konovalov
2020-11-05 16:57   ` Catalin Marinas
2020-11-04 23:18 ` [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE Andrey Konovalov
2020-11-05 11:16   ` Vincenzo Frascino
2020-11-05 11:35     ` Andrey Konovalov
2020-11-05 11:42       ` Vincenzo Frascino
2020-11-05 12:14         ` Andrey Konovalov
2020-11-05 14:17           ` Vincenzo Frascino
2020-11-05 17:27             ` Andrey Konovalov
2020-11-05 17:25   ` Catalin Marinas
2020-11-05 17:29     ` Andrey Konovalov [this message]
2020-11-05 17:39       ` Catalin Marinas
2020-11-05 18:09         ` Andrey Konovalov
2020-11-06 11:11           ` Vincenzo Frascino
2020-11-04 23:18 ` [PATCH v8 31/43] arm64: mte: Convert gcr_user into an exclude mask Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 32/43] arm64: mte: Switch GCR_EL1 in kernel entry and exit Andrey Konovalov
2020-11-05 17:30   ` Catalin Marinas
2020-11-05 17:33     ` Andrey Konovalov
2020-11-05 17:42   ` Catalin Marinas
2020-11-04 23:18 ` [PATCH v8 33/43] arm64: kasan: Align allocations for HW_TAGS Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 34/43] arm64: kasan: Add arch layer for memory tagging helpers Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 35/43] kasan: define KASAN_GRANULE_SIZE for HW_TAGS Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 36/43] kasan, x86, s390: update undef CONFIG_KASAN Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 37/43] kasan, arm64: expand CONFIG_KASAN checks Andrey Konovalov
2020-11-05 17:32   ` Catalin Marinas
2020-11-04 23:18 ` [PATCH v8 38/43] kasan, arm64: implement HW_TAGS runtime Andrey Konovalov
2020-11-04 23:48   ` Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 39/43] kasan, arm64: print report from tag fault handler Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 40/43] kasan, mm: reset tags when accessing metadata Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 41/43] kasan, arm64: enable CONFIG_KASAN_HW_TAGS Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 42/43] kasan: add documentation for hardware tag-based mode Andrey Konovalov
2020-11-04 23:18 ` [PATCH v8 43/43] kselftest/arm64: Check GCR_EL1 after context switch Andrey Konovalov

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