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Mon, 07 Oct 2024 16:33:27 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE3uOhYexO703NofjJ/K1+V6Z0EqfLIjrytFm7WskmOCohACxWBRCDtgqXpyOZ0bCoE9smNBQ== X-Received: by 2002:a17:90b:302:b0:2d8:d098:4f31 with SMTP id 98e67ed59e1d1-2e1e626c06amr14188663a91.17.1728344006795; Mon, 07 Oct 2024 16:33:26 -0700 (PDT) Received: from [192.168.68.54] ([103.210.27.132]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e1e85d93b1sm7767761a91.25.2024.10.07.16.33.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Oct 2024 16:33:26 -0700 (PDT) Message-ID: <07d1c00d-fcdc-4121-a766-2eb0c149bb8d@redhat.com> Date: Tue, 8 Oct 2024 09:33:17 +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 v6 03/11] arm64: realm: Query IPA size from the RMM To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: 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: <20241004144307.66199-1-steven.price@arm.com> <20241004144307.66199-4-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20241004144307.66199-4-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/5/24 12:42 AM, Steven Price wrote: > The top bit of the configured IPA size is used as an attribute to > control whether the address is protected or shared. Query the > configuration from the RMM to assertain which bit this is. > > Reviewed-by: Catalin Marinas > Reviewed-by: Gavin Shan > Co-developed-by: Suzuki K Poulose > Signed-off-by: Suzuki K Poulose > Signed-off-by: Steven Price > --- > Changes since v4: > * Make PROT_NS_SHARED check is_realm_world() to reduce impact on > non-CCA systems. > Changes since v2: > * Drop unneeded extra brackets from PROT_NS_SHARED. > * Drop the explicit alignment from 'config' as struct realm_config now > specifies the alignment. > --- > arch/arm64/include/asm/pgtable-prot.h | 4 ++++ > arch/arm64/include/asm/rsi.h | 2 +- > arch/arm64/kernel/rsi.c | 8 ++++++++ > 3 files changed, 13 insertions(+), 1 deletion(-) > [...] > diff --git a/arch/arm64/include/asm/rsi.h b/arch/arm64/include/asm/rsi.h > index e4c01796c618..acba065eb00e 100644 > --- a/arch/arm64/include/asm/rsi.h > +++ b/arch/arm64/include/asm/rsi.h > @@ -27,7 +27,7 @@ static inline int rsi_set_memory_range(phys_addr_t start, phys_addr_t end, > > while (start != end) { > ret = rsi_set_addr_range_state(start, end, state, flags, &top); > - if (WARN_ON(ret || top < start || top > end)) > + if (ret || top < start || top > end) > return -EINVAL; > start = top; > } I think the changes belong to PATCH[02/11] :) Thanks, Gavin