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[82.27.183.148]) by smtp.gmail.com with ESMTPSA id x19sm3142204wmi.10.2021.07.08.15.05.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jul 2021 15:05:47 -0700 (PDT) Date: Thu, 8 Jul 2021 23:05:46 +0100 From: Leif Lindholm To: Peter Maydell Subject: Re: [PATCH v4 7/8] hw/arm/sbsa-ref: add ITS support in SBSA GIC Message-ID: <20210708220546.rd7yqpsh6l7dmltu@leviathan> References: <20210602180042.111347-1-shashi.mallela@linaro.org> <20210602180042.111347-8-shashi.mallela@linaro.org> <20210603114254.mkqr4jnpfqkx3m6w@leviathan> <20210604104204.z3hhm2cxesnm2jx2@leviathan> <16db7ae4bb0b38100a08f0539ae2865c15264f1e.camel@linaro.org> <20210708194053.ar4yspiodigxwbwc@leviathan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=leif@nuviainc.com; helo=mail-wm1-x330.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Shashi Mallela , Radoslaw Biernacki , QEMU Developers , qemu-arm Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Jul 08, 2021 at 21:05:02 +0100, Peter Maydell wrote: > On Thu, 8 Jul 2021 at 20:40, Leif Lindholm wrote: > > I think my summary-summary would be: > > - I think we will need to introduce a compatiblity-breaking change to > > sbsa-ref. > > - I think we will need to have support for more than one ITS if we're > > going to be able to use QEMU to prototype real systems. > > - I think we should then start versioning sbsa-ref (like many other > > platforms already are). And there are other reasons why I would want > > to do this. > > - But I think it would be unfair to hold this set back for it. > > FWIW, I do not currently expect this series to make 6.1, so we > have some time to get things right. Ah, ok. Then I would ideally like to see this patch add the ITS block between Distributor and Redistributors regions. I think it makes the most sense for this version to match the GIC-600 layout. I am also going to rework those two remaining gicv4-ish patches based on my acquired understanding, to be sent out post v6.1. And, I would like to switch the default CPU of sbsa-ref to "max" as part of that platform versioning, now that is supported in TF-A (from v2.5). / Leif