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From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	linux-arm-kernel@lists.infradead.org
Cc: linux-mm@kvack.org, Patrick Daly <pdaly@codeaurora.org>,
	Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH] arm64: mte: Map hotplugged memory as Normal Tagged
Date: Wed, 10 Mar 2021 12:35:53 +0530	[thread overview]
Message-ID: <eb170cd4-5e39-d3f5-6c82-9550591eabff@arm.com> (raw)
In-Reply-To: <20210309122601.5543-1-catalin.marinas@arm.com>


On 3/9/21 5:56 PM, Catalin Marinas wrote:
> In a system supporting MTE, the linear map must allow reading/writing
> allocation tags by setting the memory type as Normal Tagged. Currently,
> this is only handled for memory present at boot. Hotplugged memory uses
> Normal non-Tagged memory.
> 
> Introduce pgprot_mhp() for hotplugged memory and use it in
> add_memory_resource(). The arm64 code maps pgprot_mhp() to
> pgprot_tagged().
> 
> Note that ZONE_DEVICE memory should not be mapped as Tagged and
> therefore setting the memory type in arch_add_memory() is not feasible.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Fixes: 0178dc761368 ("arm64: mte: Use Normal Tagged attributes for the linear map")
> Reported-by: Patrick Daly <pdaly@codeaurora.org>
> Link: https://lore.kernel.org/r/1614745263-27827-1-git-send-email-pdaly@codeaurora.org
> Cc: <stable@vger.kernel.org> # 5.10.x
> Cc: Will Deacon <will@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
> Cc: David Hildenbrand <david@redhat.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>


WARNING: multiple messages have this Message-ID (diff)
From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	linux-arm-kernel@lists.infradead.org
Cc: linux-mm@kvack.org, Patrick Daly <pdaly@codeaurora.org>,
	Will Deacon <will@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH] arm64: mte: Map hotplugged memory as Normal Tagged
Date: Wed, 10 Mar 2021 12:35:53 +0530	[thread overview]
Message-ID: <eb170cd4-5e39-d3f5-6c82-9550591eabff@arm.com> (raw)
In-Reply-To: <20210309122601.5543-1-catalin.marinas@arm.com>


On 3/9/21 5:56 PM, Catalin Marinas wrote:
> In a system supporting MTE, the linear map must allow reading/writing
> allocation tags by setting the memory type as Normal Tagged. Currently,
> this is only handled for memory present at boot. Hotplugged memory uses
> Normal non-Tagged memory.
> 
> Introduce pgprot_mhp() for hotplugged memory and use it in
> add_memory_resource(). The arm64 code maps pgprot_mhp() to
> pgprot_tagged().
> 
> Note that ZONE_DEVICE memory should not be mapped as Tagged and
> therefore setting the memory type in arch_add_memory() is not feasible.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Fixes: 0178dc761368 ("arm64: mte: Use Normal Tagged attributes for the linear map")
> Reported-by: Patrick Daly <pdaly@codeaurora.org>
> Link: https://lore.kernel.org/r/1614745263-27827-1-git-send-email-pdaly@codeaurora.org
> Cc: <stable@vger.kernel.org> # 5.10.x
> Cc: Will Deacon <will@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
> Cc: David Hildenbrand <david@redhat.com>

Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>

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  parent reply	other threads:[~2021-03-10  7:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-09 12:26 [PATCH] arm64: mte: Map hotplugged memory as Normal Tagged Catalin Marinas
2021-03-10 19:24 ` Patrick Daly
2021-03-09 12:26 ` Catalin Marinas
2021-03-09 12:28 ` David Hildenbrand
2021-03-09 12:28   ` David Hildenbrand
2021-03-09 12:35 ` Vincenzo Frascino
2021-03-09 12:35   ` Vincenzo Frascino
2021-03-10  6:16 ` Patrick Daly
2021-03-10  7:05 ` Anshuman Khandual [this message]
2021-03-10  7:05   ` Anshuman Khandual
2021-03-10 11:39 ` Will Deacon
2021-03-10 11:39   ` Will Deacon

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