linux-kernel - Re: [PATCH v8 34/43] arm64: RME: Propagate number of breakpoints and watchpoints to userspace

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Message-ID: <0be0479c-13d8-4fc9-9128-a3d414392a5b@redhat.com>
Date: Thu, 1 May 2025 13:40:45 +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 v8 34/43] arm64: RME: Propagate number of breakpoints and
 watchpoints to userspace

On 4/16/25 11:41 PM, Steven Price wrote:
> From: Jean-Philippe Brucker <jean-philippe@...aro.org>
> 
> The RMM describes the maximum number of BPs/WPs available to the guest
> in the Feature Register 0. Propagate those numbers into ID_AA64DFR0_EL1,
> which is visible to userspace. A VMM needs this information in order to
> set up realm parameters.
> 
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
>   arch/arm64/include/asm/kvm_rme.h |  2 ++
>   arch/arm64/kvm/rme.c             | 22 ++++++++++++++++++++++
>   arch/arm64/kvm/sys_regs.c        |  2 +-
>   3 files changed, 25 insertions(+), 1 deletion(-)
> 

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