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Wed, 30 Apr 2025 20:40:54 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGcdCIV/XU+3thu81d9MiACXjb+DjhRRhcxhdfe4+xkJBBdN6cJ+Wf09/OtaoBNYxBmSezekg== X-Received: by 2002:a05:6a21:1788:b0:201:4061:bd94 with SMTP id adf61e73a8af0-20ba74f9efemr2316662637.19.1746070853706; Wed, 30 Apr 2025 20:40:53 -0700 (PDT) Received: from [192.168.68.51] ([180.233.125.65]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74039a2e75fsm2624953b3a.98.2025.04.30.20.40.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Apr 2025 20:40:53 -0700 (PDT) Message-ID: <0be0479c-13d8-4fc9-9128-a3d414392a5b@redhat.com> Date: Thu, 1 May 2025 13:40:45 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 34/43] arm64: RME: Propagate number of breakpoints and watchpoints to userspace To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Jean-Philippe Brucker , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20250416134208.383984-1-steven.price@arm.com> <20250416134208.383984-35-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20250416134208.383984-35-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/16/25 11:41 PM, Steven Price wrote: > From: Jean-Philippe Brucker > > 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 > Signed-off-by: Steven Price > --- > 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