From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from ws5-mx01.kavi.com (ws5-mx01.kavi.com [34.193.7.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4E3B5CDB465 for ; Thu, 19 Oct 2023 09:54:56 +0000 (UTC) Received: from lists.oasis-open.org (oasis.ws5.connectedcommunity.org [10.110.1.242]) by ws5-mx01.kavi.com (Postfix) with ESMTP id A8B4412920C for ; Thu, 19 Oct 2023 09:54:55 +0000 (UTC) Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id A0D7F9868E3 for ; Thu, 19 Oct 2023 09:54:55 +0000 (UTC) Received: from host09.ws5.connectedcommunity.org (host09.ws5.connectedcommunity.org [10.110.1.97]) by lists.oasis-open.org (Postfix) with QMQP id 948E99868DA; Thu, 19 Oct 2023 09:54:55 +0000 (UTC) Mailing-List: contact virtio-comment-help@lists.oasis-open.org; run by ezmlm List-ID: Sender: Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id 86EFC9868DB for ; Thu, 19 Oct 2023 09:54:55 +0000 (UTC) X-Virus-Scanned: amavisd-new at kavi.com X-MC-Unique: 6KrVNorhNKSWhCHUpI5wnA-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697709289; x=1698314089; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=0Ph5aLWGFDfMfc1ENUeHZcTKhszTlJseMvNwPq8Y29E=; b=eXwCOfNmVBCm4XH+q8JDFscRDRejxRkNP6RHBPAeUBJr7E4/+UY/N0GEs92VvOVyC8 zWeudvWOFnfBZRTQrbIqK21ncyXB6R2FFFW82h7SV+zRgHx2dzU7hxmktq0u/zazEUAa VYsAd0thTUaV6HZoN11aVEyVH3NqWgVE1x+nobZAkW2HpDZPEMNg52fczUisE8jPK3IY HWLm4GHvNioTkdgl+SYP6gY64bFbhCA/HaAVsIIk6mbq3INlJ40h6R6wL70/itTSP8xf SYKylRTuR9sl7/lZ4m/3N2tcWvx15+pWYfpcDoe/phE/7ykcdONvEpm0MwTPoapyTWmf yqxw== X-Gm-Message-State: AOJu0YyKO0Rj23YpmE+2GY7ZGlZf7jwbyxsiWh/sY4Po1CqflnRMPixI DGPtrL/9aigOhcc+Zp5wQ/wBGjr7wYBEoAnV86rtzz1vf4NRdRc+Fm1UtfYANb3sKglLb8HvwbN UhRnrSxD1hzDydisoNYlNPLNQ6jp/G1gEug== X-Received: by 2002:a05:600c:4f45:b0:404:757e:c5ba with SMTP id m5-20020a05600c4f4500b00404757ec5bamr1350037wmq.26.1697709289805; Thu, 19 Oct 2023 02:54:49 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGqBA9RbNX7RWcYZl49xfWO+NNi62ZAH1Yk3sE3eS4ox3x5DosSmRz4oh3J9ZHXCEmzfjKaAQ== X-Received: by 2002:a05:600c:4f45:b0:404:757e:c5ba with SMTP id m5-20020a05600c4f4500b00404757ec5bamr1350021wmq.26.1697709289470; Thu, 19 Oct 2023 02:54:49 -0700 (PDT) Date: Thu, 19 Oct 2023 05:54:44 -0400 From: "Michael S. Tsirkin" To: Parav Pandit Cc: Jason Wang , "Zhu, Lingshan" , "virtio-comment@lists.oasis-open.org" , "cohuck@redhat.com" , "sburla@marvell.com" , Shahaf Shuler , Maor Gottlieb , Yishai Hadas Message-ID: <20231019055352-mutt-send-email-mst@kernel.org> References: <20231019020413-mutt-send-email-mst@kernel.org> <20231019041629-mutt-send-email-mst@kernel.org> <20231019050553-mutt-send-email-mst@kernel.org> <20231019052328-mutt-send-email-mst@kernel.org> <20231019052725-mutt-send-email-mst@kernel.org> <20231019055251-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 In-Reply-To: <20231019055251-mutt-send-email-mst@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Subject: Re: [virtio-comment] [PATCH v1 1/8] admin: Add theory of operation for device migration On Thu, Oct 19, 2023 at 05:53:29AM -0400, Michael S. Tsirkin wrote: > On Thu, Oct 19, 2023 at 09:41:46AM +0000, Parav Pandit wrote: > > > > > From: Michael S. Tsirkin > > > Sent: Thursday, October 19, 2023 3:03 PM > > > > > > With a capability you can discover it without poking at features. > > > > > > > > > > > It is discouraged by pci spec. > > > > > Pci caps for mostly doing very small init time sort of config. > > > > > Not to run frequent commands. > > > > > > > > Interesting. where in the spec exactly? > > > > > > And the reason I ask is because I'd like to understand the exact limitation. > > > > > > In any case, we should still maybe look for ways to separate it from config. > > > Maybe a capability points at a BAR and that is where we have this stuff? > > > > > Yes, I replied in your previous email, a similar suggestion. > > Lets first agree that it is drafted for non-passthrough mode. > > I could see passthrough use it too if there, why not. The big limitation of such a hack is dependence on PASID. So it's more of a long term option when PASID becomes more widespread. -- MST This publicly archived list offers a means to provide input to the OASIS Virtual I/O Device (VIRTIO) TC. In order to verify user consent to the Feedback License terms and to minimize spam in the list archive, subscription is required before posting. Subscribe: virtio-comment-subscribe@lists.oasis-open.org Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org List help: virtio-comment-help@lists.oasis-open.org List archive: https://lists.oasis-open.org/archives/virtio-comment/ Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists Committee: https://www.oasis-open.org/committees/virtio/ Join OASIS: https://www.oasis-open.org/join/