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Date: Mon, 16 Dec 2024 16:45:21 +0000
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Subject: Re: [PATCH v6 03/43] arm64: RME: Handle Granule Protection Faults
 (GPFs)
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To: Steven Price <steven.price@arm.com>, kvm@vger.kernel.org,
 kvmarm@lists.linux.dev
Cc: Catalin Marinas <catalin.marinas@arm.com>, Marc Zyngier <maz@kernel.org>,
 Will Deacon <will@kernel.org>, James Morse <james.morse@arm.com>,
 Oliver Upton <oliver.upton@linux.dev>, Zenghui Yu <yuzenghui@huawei.com>,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Joey Gouly <joey.gouly@arm.com>, Alexandru Elisei
 <alexandru.elisei@arm.com>, Christoffer Dall <christoffer.dall@arm.com>,
 Fuad Tabba <tabba@google.com>, linux-coco@lists.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>,
 Gavin Shan <gshan@redhat.com>, Shanker Donthineni <sdonthineni@nvidia.com>,
 Alper Gun <alpergun@google.com>, "Aneesh Kumar K . V"
 <aneesh.kumar@kernel.org>
References: <20241212155610.76522-1-steven.price@arm.com>
 <20241212155610.76522-4-steven.price@arm.com>
From: Suzuki K Poulose <suzuki.poulose@arm.com>
In-Reply-To: <20241212155610.76522-4-steven.price@arm.com>
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On 12/12/2024 15:55, Steven Price wrote:
> If the host attempts to access granules that have been delegated for use
> in a realm these accesses will be caught and will trigger a Granule
> Protection Fault (GPF).
> 
> A fault during a page walk signals a bug in the kernel and is handled by
> oopsing the kernel. A non-page walk fault could be caused by user space
> having access to a page which has been delegated to the kernel and will
> trigger a SIGBUS to allow debugging why user space is trying to access a
> delegated page.
> 
> Signed-off-by: Steven Price <steven.price@arm.com>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>