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Wed, 15 Oct 2025 09:35:00 -0700 (PDT) Received: from ziepe.ca ([130.41.10.202]) by smtp.gmail.com with ESMTPSA id 006d021491bc7-65031fb8ac8sm2365203eaf.20.2025.10.15.09.34.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Oct 2025 09:35:00 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1v94So-0000000HS5J-2mCC; Wed, 15 Oct 2025 13:34:58 -0300 Date: Wed, 15 Oct 2025 13:34:58 -0300 From: Jason Gunthorpe To: James Bottomley Cc: Greg KH , "Aneesh Kumar K.V" , Jeremy Linton , Jonathan Cameron , Dan Williams , linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, aik@amd.com, lukas@wunner.de, Samuel Ortiz , Xu Yilun , Suzuki K Poulose , Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , Oliver Upton Subject: Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device Message-ID: <20251015163458.GI3938986@ziepe.ca> References: <20250730113827.000032b8@huawei.com> <20250730132333.00006fbf@huawei.com> <2025073035-bulginess-rematch-b92e@gregkh> <20251010135922.GC3833649@ziepe.ca> <2025101523-evil-dole-66a3@gregkh> <20251015115044.GE3938986@ziepe.ca> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Oct 15, 2025 at 11:19:41AM -0400, James Bottomley wrote: > This came up for the SVSM as well: we want to expose things that can be > virtual devices or other resources that the guest discovers. Our > conclusion was we either needed to share one of the virtual busses > (like virtio) or do our own svsm bus. The agreement was to implement > our own bus, but we still haven't got around to it. I think your own bus only makes sense if there is a structured general discovery mechanism that can be used to automatically enumerate the devices to create. If you are open coding all the discovery via C tests in Linux then aux bus is probably appropriate.. Jason