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([2a01:e0a:59e:9d80:527b:9dff:feef:3874]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4395a1aa7bcsm178892785e9.28.2025.02.18.03.42.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Feb 2025 03:42:16 -0800 (PST) Message-ID: Date: Tue, 18 Feb 2025 12:42:14 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/3] docs/cpu-features: Update "PAuth" (Pointer Authentication) details Content-Language: en-US To: Peter Maydell , Kashyap Chamarthy Cc: qemu-devel@nongnu.org, Ninad Palsule , sebott@redhat.com, maz@kernel.org, Andrew Jeffery , Alistair Francis , "Edgar E. Iglesias" , Tyrone Ting , Hao Wu , Zhenzhong Duan , =?UTF-8?Q?Alex_Benn=C3=A9e?= , =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Steven Lee , Troy Lee , Joel Stanley , Jamin Lin , Yi Liu , qemu-arm@nongnu.org, Alexandre Iooss , richard.henderson@linaro.org References: <20250217163732.3718617-1-kchamart@redhat.com> <20250217163732.3718617-3-kchamart@redhat.com> From: Eric Auger In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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, On 2/18/25 12:34 PM, Peter Maydell wrote: > On Tue, 18 Feb 2025 at 11:29, Kashyap Chamarthy wrote: >> (Cc: Richard Henderson; context: "SME" and "RME" feature discussion >> below.) >> >> On Mon, Feb 17, 2025 at 06:43:01PM +0100, Eric Auger wrote: >>> The resulting header layout seems weird to me. >>> Initially we had at top level (assuming ===): >>> >>> KVM vCPU Features >>> TCG vCPU Features >>> SVE CPU Properties >>> SME CPU Properties >>> RME CPU Properties >>> >>> and now >>> >>> TCG vCPU Features has somehow disappeared giving the impression that >>> there are none. >>> Maybe we shall >>> - rename KVM vCPU Features -> KVM only vCPU Features >>> - Add a TCG only vCPU features including both SME and RME ones >>> - introduce a top level KVM and TCG vCPU features with below: >>> PAUTH, SVE, detailing potential different semantic for both KVM and TCG mode >> Yeah, it can be done. Would you be okay if I do it as a follow-up? As >> this a re-work of the entire doc with several features. > I think personally I would favour not having the split of > "KVM only", "TCG only", etc sections. Instead document > all of the properties in the same format, and have each > property say whether it is TCG-specific, KVM-specific, etc. This other alternative looks totally fine to me as well. > > Some of these properties may at some point in the future > change, after all -- SME is currently TCG only but may get > support in KVM and HVF in future; "aarch64" is currently > KVM only but we might some day support it in TCG. agreed Eric > > thanks > -- PMM >