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[54.240.197.234]) by smtp.gmail.com with ESMTPSA id g16sm3265825wrs.88.2020.08.05.09.40.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Aug 2020 09:40:14 -0700 (PDT) From: Paul Durrant X-Google-Original-From: "Paul Durrant" To: "'Jan Beulich'" , "'Oleksandr Tyshchenko'" References: <1596478888-23030-1-git-send-email-olekstysh@gmail.com> <1596478888-23030-8-git-send-email-olekstysh@gmail.com> <4ffa6434-3ad6-04dc-bfde-f75196930fb4@suse.com> In-Reply-To: <4ffa6434-3ad6-04dc-bfde-f75196930fb4@suse.com> Subject: RE: [RFC PATCH V1 07/12] A collection of tweaks to be able to run emulator in driver domain Date: Wed, 5 Aug 2020 17:40:20 +0100 Message-ID: <005f01d66b47$1c58ccc0$550a6640$@xen.org> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Content-Language: en-gb Thread-Index: AQIHYXuU00Oy15gaFT3m+7M9vTQs4QJrY6HzAsS1Dt2onkgdgA== X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Reply-To: paul@xen.org Cc: 'Stefano Stabellini' , 'Julien Grall' , 'Wei Liu' , 'Andrew Cooper' , 'Ian Jackson' , 'George Dunlap' , 'Oleksandr Tyshchenko' , xen-devel@lists.xenproject.org, 'Daniel De Graaf' Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" > -----Original Message----- > From: Jan Beulich > Sent: 05 August 2020 17:20 > To: Oleksandr Tyshchenko ; Paul Durrant = > Cc: xen-devel@lists.xenproject.org; Oleksandr Tyshchenko = ; Andrew > Cooper ; George Dunlap = ; Ian Jackson > ; Julien Grall ; Stefano = Stabellini > ; Wei Liu ; Daniel De Graaf = > Subject: Re: [RFC PATCH V1 07/12] A collection of tweaks to be able to = run emulator in driver domain >=20 > On 03.08.2020 20:21, Oleksandr Tyshchenko wrote: > > From: Oleksandr Tyshchenko > > > > Trying to run emulator in driver domain I ran into various issues > > mostly policy-related. So this patch tries to resolve all them > > plobably in a hackish way. I would like to get feedback how > > to implement them properly as having an emulator in driver domain > > is a completely valid use-case. >=20 > From going over the comments I can only derive you want to run > an emulator in a driver domain, which doesn't really make sense > to me. A driver domain has a different purpose after all. If > instead you mean it to be run in just some other domain (which > also isn't the domain controlling the target), then there may > be more infrastructure changes needed. >=20 > Paul - was/is your standalone ioreq server (demu?) able to run > in other than the domain controlling a guest? >=20 Not something I've done yet, but it was always part of the idea so that = we could e.g. pass through a device to a dedicated domain and then run = multiple demu instances there to virtualize it for many domUs. (I'm = thinking here of a device that is not SR-IOV and hence would need some = bespoke emulation code to share it out). That dedicated domain would be = termed the 'driver domain' simply because it is running the device = driver for the h/w that underpins the emulation. Paul