From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-comment-return-1181-cohuck=redhat.com@lists.oasis-open.org Sender: 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 88ACE985F90 for ; Wed, 15 Apr 2020 11:24:00 +0000 (UTC) References: <6774E3D0-4DA4-4CAA-B4D8-370982260E62@amazon.com> <20200410100922.wynrrzmbagjsaxd6@steredhat> <20200414105031.GC127149@stefanha-x1.localdomain> From: "Eftime, Petre" Message-ID: <696c2be6-6a7a-cfe5-91d6-f75d2e74299f@amazon.com> Date: Wed, 15 Apr 2020 14:23:48 +0300 MIME-Version: 1.0 In-Reply-To: <20200414105031.GC127149@stefanha-x1.localdomain> Content-Language: en-US Subject: Re: [virtio-comment] Seeking guidance for custom virtIO device Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 To: Stefan Hajnoczi Cc: sgarzare@redhat.com, graf@amazon.de, "virtio-comment@lists.oasis-open.org" List-ID: Ck9uIDIwMjAtMDQtMTQgMTM6NTAsIFN0ZWZhbiBIYWpub2N6aSB3cm90ZToKPiBPbiBGcmksIEFw ciAxMCwgMjAyMCBhdCAxMjowOToyMlBNICswMjAwLCBTdGVmYW5vIEdhcnphcmVsbGEgd3JvdGU6 Cj4+IEhpLAo+Pgo+PiBPbiBGcmksIEFwciAxMCwgMjAyMCBhdCAwOTozNjo1OEFNICswMDAwLCBF ZnRpbWUsIFBldHJlIHdyb3RlOgo+Pj4gSGkgYWxsLAo+Pj4KPj4+IEkgYW0gbG9va2luZyBmb3Ig Z3VpZGFuY2Ugb24gaG93IHRvIHByb2NlZWQgd2l0aCByZWdhcmRzIHRvIGVpdGhlciByZXNlcnZp bmcgYSB2aXJ0aW8gZGV2aWNlIElEIGZvciBhIHNwZWNpZmljIGRldmljZSBmb3IgYSBwYXJ0aWN1 bGFyIHVzZWNhc2UgIG9yIGZvciBmb3JtYWxpemluZyBhIGRldmljZSB0eXBlIHRoYXQgY291bGQg YmUgcG90ZW50aWFsbHkgdXNlZCBieSBvdGhlcnMuCj4+Pgo+Pj4gV2UgaGF2ZSBkZXZlbG9wZWQg YSB2aXJ0aW8gZGV2aWNlIHRoYXQgYWN0cyBhcyBhIHRyYW5zcG9ydCBmb3IgQVBJIGNhbGxzIGJl dHdlZW4gYSBndWVzdCB1c2Vyc3BhY2UgbGlicmFyeSBhbmQgYSBiYWNrZW5kIHNlcnZlciBpbiB0 aGUgaG9zdCBzeXN0ZW0uCj4+PiBPdXIgcmVxdWlyZW1lbnRzIGFyZToKPj4+ICogbXVsdGlwbGUg Y2xpZW50cyBpbiB0aGUgZ3Vlc3QgKG11bHRpcGxlIHNlcnZlcnMgaXMgbm90IHJlcXVpcmVkKQo+ Pj4gKiBwcm92aWRlIGFuIGluLW9yZGVyLCByZWxpYWJsZSBkYXRhZ3JhbSB0cmFuc3BvcnQgbWVj aGFuaXNtCj4+PiAqIGRhdGFncmFtIHNpemUgc2hvdWxkIGJlIGVpdGhlciBuZWdvdGlhYmxlIG9y IGxhcmdlICgxNmstNjRrPykKPj4+ICogcGVyZm9ybWFuY2UgaXMgbm90IGEgYmlnIGNvbmNlcm4g Zm9yIG91ciB1c2VjYXNlCj4+IEl0IGxvb2tzIHJlYWxseSBjbG9zZSB0byB2c29jay4KPj4KPj4+ IFRoZSByZWFzb24gd2h5IHdlIHVzZWQgYSBzcGVjaWFsIGRldmljZSBhbmQgbm90IHNvbWV0aGlu ZyBlbHNlIGlzIHRoZSBmb2xsb3dpbmc6Cj4+PiAqIHZzb2NrIHNwZWMgZG9lcyBub3QgY29udGFp biBhIGRhdGFncmFtIHNwZWNpZmljYXRpb24gKGVnLiBTT0NLX0RHUkFNLCBTT0NLX1NFUVBBQ0tF VCkgYW5kIHRoZSBlZmZvcnQgb2YgdXBkYXRpbmcgdGhlIExpbnV4IGRyaXZlciBhbmQgb3RoZXIg aW1wbGVtZW50YXRpb25zIGZvciB0aGlzIHBhcnRpY3VsYXIgcHVycG9zZcKgwqBzZWVtZWQgcmVs YXRpdmVseSBoaWdoLiBUaGUgcGF0aCB0byBhcHByb2FjaCB0aGlzIHByb2JsZW0gd2Fzbid0IGNs ZWFyLiBWc29jayB0b2RheSBvbmx5IHdvcmtzIGluIFNPQ0tfU1RSRUFNIG1vZGUgYW5kIHRoaXMg aXMgbm90IGlkZWFsOiB0aGUgcmVjZWl2ZXIgbXVzdCBpbXBsZW1lbnQgYWRkaXRpb25hbCBzdGF0 ZSBhbmQgYnVmZmVyIGluY29taW5nIGRhdGEswqDCoGFkZGluZyBjb21wbGV4aXR5IGFuZCBob3N0 IHJlc291cmNlIHVzYWdlLgo+PiBBRl9WU09DSyBpdHNlbGYgc3VwcG9ydHMgU09DS19ER1JBTSwg YnV0IHZpcnRpby12c29jayBkb2Vzbid0IHByb3ZpZGUKPj4gdGhpcyBmZWF0dXJlLiAodm1jaSBw cm92aWRlcyBTT0NLX0RHUkFNIHN1cHBvcnQpCj4+Cj4+IFRoZSBjaGFuZ2VzIHNob3VsZCBub3Qg YmUgdG9vIGludHJ1c2l2ZSBpbiB0aGUgdmlydGlvLXZzb2NrIHNwZWNzIGFuZAo+PiBpbXBsZW1l bnRhdGlvbiwgd2UgYWxyZWFkeSBoYXZlIHRoZSAidHlwZSIgZmllbGQgaW4gdGhlIHBhY2tldCBo ZWFkZXIKPj4gdG8gYWRkcmVzcyB0aGlzIG5ldyBmZWF0dXJlLgo+Pgo+PiBXZSBhbHNvIGhhdmUg dGhlIGNyZWRpdC1tZWNoYW5pc20gdG8gcHJvdmlkZSBpbi1vcmRlciBhbmQgcmVsaWFibGUKPj4g cGFja2V0cyBkZWxpdmVyeS4KPj4KPj4gTWF5YmUgdGhlIGhhcmRlc3QgcGFydCBjb3VsZCBiZSBj aGFuZ2Ugc29tZXRoaW5nIGluIHRoZSBjb3JlIHRvIGhhbmRsZQo+PiBtdWx0aXBsZSB0cmFuc3Bv cnRzIHRoYXQgcHJvdmlkZSBTT0NLX0RHUkFNLCBmb3IgbmVzdGVkIFZNcy4KPj4gV2UgYWxyZWFk eSBkaWQgZm9yIHN0cmVhbSBzb2NrZXRzLCBidXQgd2UgZGlkbid0IGhhbmRsZSB0aGUgZGF0YWdy YW0KPj4gc29ja2V0IGZvciBub3cuCj4+Cj4+IEkgYW0gbm90IHN1cmUgaG93IGNvbnZlbmllbnQg aXQgaXMgdG8gaGF2ZSB0d28gdmVyeSBzaW1pbGFyIGRldmljZXMuLi4KPj4KPj4gSWYgeW91IGRl Y2lkZSB0byBnaXZlIHZpcnRpby12c29jayBhIGNoYW5jZSB0byBnZXQgU09DS19ER1JBTSwgSSBj YW4gdHJ5IHRvCj4+IGdpdmUgeW91IGEgbW9yZSBjb21wbGV0ZSBsaXN0IG9mIGNoYW5nZXMgdG8g bWFrZS4gOi0pCj4gSSBhbHRob3VnaCB0aGluayB0aGlzIHNvdW5kcyBleGFjdGx5IGxpa2UgYWRk aW5nIFNPQ0tfREdSQU0gc3VwcG9ydCB0bwo+IHZpcnRpby12c29jay4KPgo+IFRoZSByZWFzb24g d2h5IHRoZSBTT0NLX0RHUkFNIGNvZGUgd2FzIGRyb3BwZWQgZnJvbSBlYXJseSB2aXJ0aW8tdnNv Y2sKPiBwYXRjaGVzIGlzIHRoYXQgdGhlIHByb3RvdG9jb2wgZGVzaWduIGRpZG4ndCBlbnN1cmUg cmVsaWFibGUgZGVsaXZlcnkKPiBzZW1hbnRpY3MuICBBdCB0aGF0IHRpbWUgdGhlcmUgd2VyZSBu byByZWFsIHVzZXJzIGZvciBTT0NLX0RHUkFNIHNvIGl0Cj4gd2FzIGxlZnQgYXMgYSBmZWF0dXJl IHRvIGJlIGFkZGVkIGxhdGVyLgo+Cj4gVGhlIGNoYWxsZW5nZSB3aXRoIHJldXNpbmcgdGhlIFNP Q0tfU1RSRUFNIGNyZWRpdCBtZWNoYW5pc20gZm9yCj4gU09DS19ER1JBTSBpcyB0aGF0IGRhdGFn cmFtcyBhcmUgY29ubmVjdGlvbmxlc3MuICBUaGUgY3JlZGl0IG1lY2hhbmlzbQo+IGNvbnNpc3Rz IHBlci1jb25uZWN0aW9uIHN0YXRlLiAgTWF5YmUgaXQgY2FuIGJlIGV4dGVuZGVkIHRvIGNvdmVy Cj4gU09DS19ER1JBTSB0b28uCj4KPiBJIHdvdWxkIHVyZ2UgeW91IHRvIGFkZCBTT0NLX0RHUkFN IHRvIHZpcnRpby12c29jayBpbnN0ZWFkIG9mIHRyeWluZyB0bwo+IGNyZWF0ZSBhbm90aGVyIGRl dmljZSB0aGF0IGRvZXMgYmFzaWNhbGx5IHdoYXQgaXMgd2l0aGluIHRoZSBzY29wZSBvZgo+IHZp cnRpby12c29jay4gIEl0IHRvb2sgcXVpdGUgYSBiaXQgb2YgdGltZSBhbmQgZWZmb3J0IHRvIGdl dCBBRl9WU09DSwo+IHN1cHBvcnQgaW50byB2YXJpb3VzIHNvZnR3YXJlIGNvbXBvbmVudHMsIGFu ZCBkb2luZyB0aGF0IGFnYWluIGZvcgo+IGFub3RoZXIgZGV2aWNlIGlzIG1vcmUgZWZmb3J0IHRo YW4gb25lIHdvdWxkIHRoaW5rLgo+Cj4gSWYgeW91IGRvbid0IHdhbnQgdG8gbW9kaWZ5IHRoZSBM aW51eCBndWVzdCBkcml2ZXIsIHRoZW4gbGV0J3MganVzdAo+IGRpc2N1c3MgdGhlIGRldmljZSBz cGVjIGFuZCBwcm90b2NvbC4gIFNvbWVvbmUgZWxzZSBjb3VsZCBtYWtlIHRoZSBMaW51eAo+IGRy aXZlciBjaGFuZ2VzLgo+Cj4gU3RlZmFuCgoKSSB0aGluayBpdCB3b3VsZCBiZSBncmVhdCBpZiB3 ZSBjb3VsZCBnZXQgdGhlIHZpcnRpby12c29jayBkcml2ZXIgdG8gCnN1cHBvcnQgU09DS19ER1JB TS9TT0NLX1NFUVBBQ0tFVCBhcyBpdCB3b3VsZCBtYWtlIGEgbG90IG9mIHNlbnNlLgoKCkJ1dCBv bmUgb2YgdGhlIHJlYXNvbnMgdGhhdCBJIGRvbid0IHJlYWxseSBsaWtlIHZpcnRpby12c29jayBh dCB0aGUgCm1vbWVudCBmb3IgbXkgdXNlLWNhc2UgaW4gcGFydGljdWxhciBpcyB0aGF0IGl0IGRv ZXNuJ3Qgc2VlbSB3ZWxsIGZpdHRlZCAKdG8gc3VwcG9ydCBub24tY29vcGVyYXRpbmcgbGl2ZS1t aWdyYXRlYWJsZSBWTXMgYWxsIHRoYXQgd2VsbC7CoCBPbmUgCnByb2JsZW0gaXMgdGhhdCB0byBh dm9pZCBndWVzdC12aXNpYmxlIGRpc2Nvbm5lY3Rpb25zIHRvIGFueSBzZXJ2aWNlIAp3aGlsZSBk b2luZyBhIGxpdmUgbWlncmF0aW9uIHRoZXJlIG1pZ2h0IGJlIHBlcmZvcm1hbmNlIGltcGFjdCBp ZiB1c2luZyAKdnNvY2sgZm9yIGFueSBvdGhlciByZWFzb25zLgoKSSdsbCB0cnkgdG8gZXhlbXBs aWZ5IHdoYXQgSSBtZWFuIHdpdGggdGhpcyBzZXR1cDoKCiDCoMKgwqAgKiB3b3JrbG9hZCAxIHNl bmRzIGRhdGEgY29uc3RhbnRseSB2aWEgYW4gQUZfVlNPQ0sgU09DS19TVFJFQU0KCiDCoMKgwqAg KiB3b3JrbG9hZCAyIHNlbmRzIGNvbW1hbmRzIC8gZ2V0cyByZXBsaWVzIG9uY2UgaW4gYSB3aGls ZSB2aWEgYW4gCkFGX1ZTT0NLIFNPQ0tfU0VRUEFDS0VULgoKQXNzdW1lIHRoZSBWTSBuZWVkcyB0 byBiZSBtaWdyYXRlZDoKCiDCoMKgwqAgwqDCoMKgIDEpIElmIHdvcmtsb2FkIDIgY3VycmVudGx5 IG5vdCBwcm9jZXNzaW5nIGFueXRoaW5nLCBldmVuIGlmIAp0aGVyZSBhcmUgc29tZSBjb21tYW5k cyBmb3IgaXQgcXVldWVkIHVwLCBldmVyeXRoaW5nIGlzIGZpbmUsIFZNTSBjYW4gCnBhdXNlIHRo ZSBndWVzdCBhbmQgc2VyaWFsaXplLgoKIMKgwqDCoMKgwqDCoMKgIDIpIElmIHRoZXJlJ3MgYW4g b3V0c3RhbmRpbmcgY29tbWFuZCB0aGUgVk1NIG5lZWRzIHRvIHdhaXQgZm9yIAppdCB0byBmaW5p c2ggYW5kIHdhaXQgZm9yIHRoZSByZWNlaXZlIHF1ZXVlIG9mIHRoZSByZXF1ZXN0IHRvIGhhdmUg CmVub3VnaCBjYXBhY2l0eSBmb3IgdGhlIHJlcGx5LCBidXQgc2luY2UgdGhpcyBjYXBhY2l0eSBp cyBndWVzdCBkcml2ZW4sIAp0aGlzIHNlY29uZCBwYXJ0IGNhbiB0YWtlIGEgd2hpbGUgLyBmb3Jl dmVyLiBUaGlzIGlzIGRlZmluaXRlbHkgbm90IGlkZWFsLgoKClRvIGZpeCB0aGlzIGlzc3VlLCB0 aGUgVk1NIGNhbiBrZWVwIGFueSBub24tZmluaXNoYWJsZSBjb21tYW5kIGluIHF1ZXVlIAp1bnRp bCBpdCBjYW4gYWN0dWFsbHkgcHJvcGVybHkgZmluaXNoIHRoZW0sIHRoYXQgaXMsIGl0IHdvbid0 IHJlbW92ZSB0aGUgCmNvbW1hbmQgZnJvbSB0aGUgcXVldWUgdW50aWwgaXQgY2FuIHB1c2ggdGhl IHJlcGx5IGJhY2sgYXMgd2VsbCwgaWYgaXQgCm5lZWRzIHRvIG1pZ3JhdGUsIGl0IGNhbiByZXN0 YXJ0IHNlcnZpY2luZyB0aGUgY29tbWFuZHMgZnJvbSBxdWV1ZS4gQnV0IAp0aGlzIGhhcyBhIGJp ZyBpbXBhY3Qgb24gd29ya2xvYWQgMSwgd2hpY2ggY2FuIGdldCBibG9ja2VkIGJ5IHdvcmtsb2Fk IDIgCmZyb20gbWVhbmluZ2Z1bCBwcm9ncmVzcy4KCkkgY291bGQgcG90ZW50aWFsbHkgc29sdmUg c29tZSBvZiB0aGUgaXNzdWVzIGFib3ZlIGJ5IHBsYXlpbmcgYXJvdW5kIAp3aXRoIHRoZSBjcmVk aXRzIHN5c3RlbSwgYnV0IGl0IHNlZW1zIGxpa2UgaXQgY291bGQgYmUgY2hhbGxlbmdpbmcgdG8g ZG8gCndlbGw6IGlmIHRoZSBkZXZpY2UgYWR2ZXJ0aXNlcyAzMmsgb2YgYnVmZmVyIHNwYWNlLCB0 aGUgZ3Vlc3QgY291bGQgCnBsYWNlIDIgMTZrIGNvbW1hbmRzIGJlZm9yZSB0aGUgZGV2aWNlIGNh biBhY3R1YWxseSB0ZWxsIGl0IHRoYXQgaXQncyAKYWN0dWFsbHkgMGsgc3BhY2Ugbm93LiBUaGlz IGFsc28gZG9lc24ndCBzY2FsZSBhbGwgdGhhdCB3ZWxsLCBjcmVkaXRzIAphcmUgcGVyIHN0cmVh bSwgc28gb25jZSB0aGUgZGV2aWNlIGdldHMgMSBjb21tYW5kIGZyb20gMSBzdHJlYW0sIGl0IApu ZWVkcyB0byB0ZWxsIGFsbCB0aGUgb3RoZXIgc3RyZWFtcyB0byBiYWNrIG9mZiwgYW5kIHdoZW4g aXQgY2FuIGhhbmRsZSAKYW5vdGhlciBjb21tYW5kLCBpdCB3b3VsZCBuZWVkIHRvIGFkdmVydGlz ZSBiYWNrIHRvIGFsbCBvZiB0aGVtIHRoYXQgCmV2ZXJ5dGhpbmcgaXMgZmluZSwgY29uc3VtaW5n IGF2YWlsYWJsZSBjYXBhY2l0eS4KCgpJIHNob3J0LCBJIHRoaW5rIHdvcmtsb2FkIDIgbmVlZHMg dG8gYmUgaW4gY29udHJvbCBvZiBpdHMgb3duIHF1ZXVlcyBmb3IgCnRoaXMgdG8gd29yayByZWFz b25hYmx5IHdlbGwsIEkgZG9uJ3Qga25vdyBpZiBzaGFyaW5nIG93bmVyc2hpcCBvZiAKcXVldWVz IGNhbiB3b3JrLiBUaGUgZGV2aWNlIHdlIGRlZmluZWQgZG9lc24ndCBoYXZlIHRoaXMgcHJvYmxl bTogZmlyc3QgCm9mIGFsbCwgaXQncyBvbiBhIHNlcGFyYXRlIHF1ZXVlLCBzbyB3b3JrbG9hZCAx IG5ldmVyIGNvbXBldGVzIGluIGFueSAKd2F5IHdpdGggd29ya2xvYWQgMiwgYW5kIHdvcmtsb2Fk IDIgYWx3YXlzIGhhcyB3aGVyZSB0byBwbGFjZSByZXBsaWVzLCAKc2luY2UgaXQgaGFzIGFuIGF0 dGFjaGVkIHJlcGx5IGJ1ZmZlciBieSBkZXNpZ24uCgoKUGVyaGFwcyBhIGdvb2QgY29tcHJvbWlz ZSB3b3VsZCBiZSB0byBoYXZlIGEgbXVsdGktcXVldWUgdmlydGlvLXZzb2NrIG9yIAphbGxvdyBB Rl9WU09DSyB0byBiZSBiYWNrZWQgbXkgbW9yZSB0aGFuIDEgZGV2aWNlIGFuZCBhbGxvdyBzb21l IAptaW5pbWFsaXN0IHJvdXRpbmcgb24gYSBwZXItZGVzdGluYXRpb24gYmFzaXM/CgoKQmVzdCwK ClBldHJlIEVmdGltZQoKCgoKQW1hem9uIERldmVsb3BtZW50IENlbnRlciAoUm9tYW5pYSkgUy5S LkwuIHJlZ2lzdGVyZWQgb2ZmaWNlOiAyN0EgU2YuIExhemFyIFN0cmVldCwgVUJDNSwgZmxvb3Ig MiwgSWFzaSwgSWFzaSBDb3VudHksIDcwMDA0NSwgUm9tYW5pYS4gUmVnaXN0ZXJlZCBpbiBSb21h bmlhLiBSZWdpc3RyYXRpb24gbnVtYmVyIEoyMi8yNjIxLzIwMDUuCg==