linux-kernel - Re: [PATCH v7 31/45] arm64: rme: Prevent Device mappings for Realms

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Message-ID: <780f593c-81cd-495c-8ca6-38ecd64ddb35@redhat.com>
Date: Tue, 4 Mar 2025 16:27:48 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Joey Gouly <joey.gouly@....com>,
 Alexandru Elisei <alexandru.elisei@....com>,
 Christoffer Dall <christoffer.dall@....com>, Fuad Tabba <tabba@...gle.com>,
 linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
 <alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v7 31/45] arm64: rme: Prevent Device mappings for Realms

On 2/14/25 2:14 AM, Steven Price wrote:
> Physical device assignment is not yet supported by the RMM, so it
> doesn't make much sense to allow device mappings within the realm.
> Prevent them when the guest is a realm.
> 
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes from v6:
>   * Fix the check in user_mem_abort() to prevent all pages that are not
>     guest_memfd() from being mapped into the protected half of the IPA.
> Changes from v5:
>   * Also prevent accesses in user_mem_abort()
> ---
>   arch/arm64/kvm/mmu.c | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>