linux-kernel - Re: [PATCH v7 36/45] arm64: RME: Set breakpoint parameters through SET_ONE

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Message-ID: <f331382f-5747-4837-ae60-42e9cb37ecd4@redhat.com>
Date: Wed, 5 Mar 2025 09:46:31 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Jean-Philippe Brucker <jean-philippe@...aro.org>,
 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 36/45] arm64: RME: Set breakpoint parameters through
 SET_ONE_REG

On 2/14/25 2:14 AM, Steven Price wrote:
> From: Jean-Philippe Brucker <jean-philippe@...aro.org>
> 
> Allow userspace to configure the number of breakpoints and watchpoints
> of a Realm VM through KVM_SET_ONE_REG ID_AA64DFR0_EL1.
> 
> The KVM sys_reg handler checks the user value against the maximum value
> given by RMM (arm64_check_features() gets it from the
> read_sanitised_id_aa64dfr0_el1() reset handler).
> 
> Userspace discovers that it can write these fields by issuing a
> KVM_ARM_GET_REG_WRITABLE_MASKS ioctl.
> 
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
>   arch/arm64/kvm/guest.c    |  2 ++
>   arch/arm64/kvm/rme.c      |  3 +++
>   arch/arm64/kvm/sys_regs.c | 17 +++++++++++------
>   3 files changed, 16 insertions(+), 6 deletions(-)
> 

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