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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id x33-20020a05600c18a100b003ede3f5c81fsm7376526wmp.41.2023.03.21.06.45.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Mar 2023 06:45:45 -0700 (PDT) Message-ID: Date: Tue, 21 Mar 2023 14:45:44 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [RFC PATCH v2 10/11] hw/arm/smmuv3: Populate OAS based on CPU PARANGE Content-Language: en-US To: Peter Maydell Cc: Mostafa Saleh , qemu-devel@nongnu.org, jean-philippe@linaro.org, qemu-arm@nongnu.org, richard.henderson@linaro.org References: <20230226220650.1480786-1-smostafa@google.com> <20230226220650.1480786-11-smostafa@google.com> <6e6810c3-c01a-5a2f-4fed-64c9391e22ba@redhat.com> From: Eric Auger In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: eric.auger@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hi Peter, On 3/21/23 14:34, Peter Maydell wrote: > thout having read much of the context, but why > would we need to migrate the ID registers? They are constant, read-only, > so they will be the same value on both source and destination. this series modifies the values of IDR[5] (oas).  So my understanding is the guest is likely to behave differently on src and dst, depending on the qemu version, no? Thanks Eric