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[69.131.147.66]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7f695fb985dsm810237b3.38.2026.06.10.20.31.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Jun 2026 20:31:09 -0700 (PDT) From: demiobenour@gmail.com X-Google-Original-From: junk Message-ID: Date: Wed, 10 Jun 2026 23:31:04 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Vhost-guest (was virtio vhost-user) vs virtio-msg References: <11771164-7919-43e1-a980-03f036bdae2e@gmail.com> <4ba67246-3a2b-43ee-b827-000c16ff07ed@gmail.com> <877bonqzqo.fsf@draig.linaro.org> Content-Language: en-US Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT To: =?UTF-8?Q?Alex_Benn=C3=A9e?= In-Reply-To: <877bonqzqo.fsf@draig.linaro.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------fRATFYQRPev4YgSHgwMMsWhM" Message-ID-Hash: UY6JZPVDRXVYUKV4PBKRKS67UHJKEXF4 X-Message-ID-Hash: UY6JZPVDRXVYUKV4PBKRKS67UHJKEXF4 X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Manos Pitsidianakis , Parav Pandit , Alyssa Ross , Spectrum OS Development , "virtio-comment@lists.linux.dev" , Viresh Kumar , Sumit Semwal , Bill Mills , "Edgar E. Iglesias" , Stefan Hajnoczi X-Mailman-Version: 3.3.10 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------fRATFYQRPev4YgSHgwMMsWhM Content-Type: multipart/mixed; boundary="------------TGTweTYxhqWutEJVAIEnqlbR"; protected-headers="v1" Message-ID: Date: Wed, 10 Jun 2026 23:31:04 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Vhost-guest (was virtio vhost-user) vs virtio-msg Cc: Manos Pitsidianakis , Parav Pandit , Alyssa Ross , Spectrum OS Development , "virtio-comment@lists.linux.dev" , Viresh Kumar , Sumit Semwal , Bill Mills , "Edgar E. Iglesias" , Stefan Hajnoczi References: <11771164-7919-43e1-a980-03f036bdae2e@gmail.com> <4ba67246-3a2b-43ee-b827-000c16ff07ed@gmail.com> <877bonqzqo.fsf@draig.linaro.org> Content-Language: en-US From: junk Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT To: =?UTF-8?Q?Alex_Benn=C3=A9e?= In-Reply-To: <877bonqzqo.fsf@draig.linaro.org> Autocrypt-Gossip: addr=hi@alyssa.is; 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boundary="------------d8cKLaUFbckTHM0K0FSJ1J3w" --------------d8cKLaUFbckTHM0K0FSJ1J3w Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 5/28/26 12:13, Alex Benn=C3=A9e wrote: > Demi Marie Obenour writes: >=20 > (add virtio-msg authors to CC) >=20 >> On 5/28/26 01:47, Manos Pitsidianakis wrote: >>> On Thu, May 28, 2026 at 8:22=E2=80=AFAM Parav Pandit wrote: >>>> >>>> >>>>> From: Demi Marie Obenour >>>>> Sent: 28 May 2026 05:23 AM >>>>> To: virtio-comment@lists.linux.dev >>>>> Subject: MSI-X vector limits and reserving a virtio device ID >>>>> >>>>> I'd like to reserve a virtio device ID for virtio vhost-guest, >>>>> formally virtio vhost-user. Would this be possible? >>>>> >>>> Vhost user is an implementation of the device. >>>> I believe it stays as implementation and not a new device type. >>> >>> This exactly. >>> >>> Furthermore, we already have a mechanism for "providing" an arbitrary= >>> virtio device; it's called a transport. >>> >>> Demi, I suggest you look into virtio-msg transport, which would allow= >>> you to do what you want. >> >> I'm aware of virtio-msg, and in fact considered using it. However, I >> found that virtio-msg doesn't meet my requirements. >> >> 1. Virtio-msg needs to run over a transport of its own. None of the >> proposed transports support KVM guests on x86. FF-A is the only >> one that would make sense with KVM, but FF-A is specific to Arm. >=20 > Well yes. virtio-msg is a common transport that implements various buse= s > on the backend. FF-A is one but we have working implementations that > just use plain memory sharing for the message bus which work on anythin= g > including x86/KVM. Although it does beg the question of what an > additional transport would being to KVM as it is already well served by= > PCI and MMIO transports. My goal is to enable device implementations that run inside a VM, rather than running on the host, for sandboxing reasons. The PCI and MMIO transports don't natively support this. The purpose of virtio-vhost-user is to add such support to the PCI transport. Virtio-msg in KVM is definitely an alternative, but none of the currently-proposed transports can be used as-is: 1. virtio-msg-ffa is specific to Arm. Furthermore, the Xen implementation is not security supported, and I don't know if the pKVM implementation has been hardened against denial of service attacks. The ones in Hafnium and TF-A were not last I checked. 2. virtio-msg-amp requires a (real or emulated) PCI connection. 3. virtio-msg-loopback is only within a single VM. 4. virtio-msg-xen is specific to Xen. 5. virtio-msg over admin virtqueues has not been implemented yet, whereas virtio-vhost-user has a nearly-complete device implementation. Additionally, I would much prefer to reuse the existing vhost-user protocol between frontend VMM and backend VMM. This avoids having to implement a third protocol on top of virtio-user and vfio-user. Virtio-vhost-user maps to that protocol trivially (by design). It should be possible to define and implement a virtio-msg binding for virtio-vhost-user, though I have no particular plan to do so at this time. Additionally, virtio-vhost-user has more features than virtio-msg. Some of these features are very useful, such as including the backend's migration data in the frontend's migration stream. Implementing them in virtio-msg would be a nasty layering violation, whereas implementing them in virtio-vhost-user is natural. >> 2. Virtio-msg isn't compatible with existing frontend VMMs. >> Vhost-guest can be used with any frontend VMM that implements >> vhost-user. >=20 > What exactly do you mean by frontend VMMs? The frontend VM is the VM that uses the virtio device. The backend VM is the VM that implements the device. The frontend VMM is the user-space code that runs the frontend VM, and the backend VMM is the user-space code that runs the backend VM. > The VMM needs some mechanism to expose a VirtIO transport to the guest > be it through probing (PCI) or some machine description like ACPI or DT= =2E > The guest is completely unaware if the backend implementation is using > vhost-user. If you were going to expose that to the guest you will need= > some mechanism for that. With virtio-vhost-user, the frontend VMM runs a vhost-user client. It exposes an MMIO or PCI device to its guest as it normally would. The frontend VMM and its guest aren't aware of virtio-vhost-user. > For what its worth there are QEMU and rust-vmm implementations of > various virtio-msg backends although we would expect the host UAPI to b= e > stabilised after the VirtIO spec is ratified (because its not guest > visible). Would you mind elaborating on "host UAPI"? Do you mean "UAPI for implementing a device"? >> 3. Virtio-msg isn't compatible with existing frontend drivers. While = I >> expect that drivers for Linux will eventually be upstreamed, >=20 > This is just plain wrong. No changes are needed to be made to the > drivers as they are transport agnostic. I meant the exiting *transport* drivers. =20 >> I doubt that drivers for Windows or *BSD will ever be written. >> I don't even know if the Windows Driver Framework provides enough >> to write one. I don't need this myself, but I suspect that this >> is enough to make virtio-msg unsuitable in many environments. >=20 > Why would Windows or *BSD want to implement virtio-msg when they can > already use MMIO and PCI? But nothing stops them implementing it if the= y > wish. If VM A is going to expose a device to VM B using virtio-msg, VM B needs virtio-msg support. With virtio-vhost-user, VM B gets a MMIO or PCI device. >> 4. Virtio-msg requires invasive changes to existing userspace device >> implementations. >=20 > No it doesn't. We test virtio-msg with existing unmodified rust-vmm > vhost-device implementations because on the host we bridge between > virtio-msg and vhost-user. In QEMU the transport is abstracted away fro= m > the details of the device implementation - you don't need MMIO and PCI > specific device implementations either. Makes sense! I was not aware of QEMU having that abstraction, but it makes sense that it does. rust-vmm really ought to also have an abstraction, so that the same device implementation can support virtio-vhost-user, vhost-msg, vhost-user, and in-process virtio. >> The project I work on doesn't use QEMU, and the >> existing frontends are targeted at server use-cases. Using the >> vhost-user protocol lets me reuse these with little effort. >> >> 5. To the best of my knowledge, virtio-msg doesn't support live >> migration of frontend VMs. Vhost-guest uses the vhost-user >> protocol, which has supported this for a very long time. I don't >> need live migration myself, but for many server use-cases, not >> having live migration is a dealbreaker. >=20 > Live migration isn't in scope for a transport (aside from maybe support= > device reset/disable flows). The information needed to deal with > migration is between the VMM and whatever implements the device backend= =2E Virtio-vhost-user has a different scope than virtio-msg. Virtio-vhost-user lets you run a vhost-user server in a guest instead of the host, so its scope includes everything that is in scope for the vhost-user protocol. That includes live migration. > Indeed I find it a little confusing how live migration would work if th= e > vhost-guest communication is directly between the backend and the guest= =2E > The VMM is the one that is responsible for serialistion and if it is cu= t > out of the loop how will it know? Live migration is a control plane operation. On the sending side, the backend VM sends migration data to its VMM over a dedicated virtqueue. The backend VMM then forwards the migration data to the frontend VMM over a pipe. On the receiving side, the frontend VMM sends the data to the backend VMM over a pipe, and the backend VMM sends it to the backend VMM over a virtqueue. This feature isn't in any of the currently published virtio-vhost-user specifications, but the version I plan to submit to this list will include it. >> 6. I don't know if virtio-msg can achieve comparable performance. >> It appears to be optimized for reliability and isolation, >> not processing tens of gigabits of network traffic per second. >> Vhost-guest is designed with performance in mind. >=20 > This is pure supposition. The data plane in virtio-msg is the same as i= n > PCI and MMIO, shared memory and virtqs. While virtio-msg does support > notifications in the message queue it does not preclude direct IRQ > signalling or indeed switch to pure polling which is what most of the > high speed networking solutions end up doing to avoid the latency of > IRQs. Are shared memory and direct IRQ signalling an option for virtio over admin virtqueues? --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------d8cKLaUFbckTHM0K0FSJ1J3w Content-Type: application/pgp-keys; name="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0xB288B55FFF9C22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49y B+l2nipdaq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYf bWpr/si88QKgyGSVZ7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/ UorR+FaSuVwT7rqzGrTlscnTDlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7M MPCJwI8JpPlBedRpe9tfVyfu3euTPLPxwcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9H zx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR6h3nBc3eyuZ+q62HS1pJ5EvU T1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl5FMWo8TCniHynNXs BtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2Bkg1b//r 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attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmoqK/kACgkQszaHOrMp 8lNIDA//U/tL2Ramk+CINqMsOW8IhlizHTApJTy9ZEdY3yE8nquNT8xM8w4iirXk 0gjkAbGCyAlIyIEaeNbn+NkP/GY4XozO3U49VB53pOzawXayUHSNGRJw+Gd4XJLV RXHSkVczAVm+PZvkksG9gLMhs2T7RQtmG7rGqxXevJGlzbsmn6fwTQgUZfRfytec QLo31Jwzj4YjENTFg1gqPCRDk8iwkP7W9JeLsBiQ3gLtgFABqWTnYuRkPsG1Did+ xg62BYTVg+sW04xWBn3kNhFgPakquAK+mcCmx3igoWEpd07PV4TNgjmPrHHvaOXF ONJyh+ASK2StBfKVypTr3h1r4V74iFE79n9WLGF8D5vJZ3MKOGH72OuyVkTBpCj1 eZhVhrHM5v8FCe/Bpz1KXo+f1vFZvlbOen89gIbQO+C4WSk3su/aEbZDw8x3rnyq rmCbiLOHI6r22IiKldmerA5sXAMzXw0DbvX9n5rxqbQ/RFkDQtj0wwTlIWaEg2lj asc152hGfsJLqdXPsUixX0sYHn/vinc3+VxU22cgBNMfHKfBKro89JyPQu8q1BrG O0MIFVWkyUz0RR4PIlYe6NxCRVbcjrRJQ47ymlv7vu1JjTr5Rel6GYKNlzXMHbV8 dMPZDjlqnY24rxcHbDgfDjMobxOV/ldx3hJtfe+kKGfl2NOXuXw= =wtEH -----END PGP SIGNATURE----- --------------fRATFYQRPev4YgSHgwMMsWhM--