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Mon, 16 Jun 2025 09:53:55 -0700 (PDT) Message-ID: <8c3b08d5-24aa-4db2-84e1-dfd1d2c52065@gmail.com> Date: Mon, 16 Jun 2025 12:53:40 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Virtio-IOMMU interrupt remapping design To: Jason Gunthorpe References: <> <20250616132031.GB1354058@ziepe.ca> Content-Language: en-US From: Demi Marie Obenour 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 In-Reply-To: <20250616132031.GB1354058@ziepe.ca> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------2moOxTn903NZZGa7yAz6amQg" Message-ID-Hash: RNLP2ZHL65DBQE2AVO3DTGU3KTRISPLT X-Message-ID-Hash: RNLP2ZHL65DBQE2AVO3DTGU3KTRISPLT X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; 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; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , "Rafael J. Wysocki" , Len Brown , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Joerg Roedel , Will Deacon , Robin Murphy , Alyssa Ross , virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux.dev, x86@kernel.org, Spectrum OS Development X-Mailman-Version: 3.3.9 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) --------------2moOxTn903NZZGa7yAz6amQg Content-Type: multipart/mixed; boundary="------------VPcIoc0R31Z8BiMlGxM7FjrE"; protected-headers="v1" From: Demi Marie Obenour To: Jason Gunthorpe Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , "Rafael J. Wysocki" , Len Brown , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Joerg Roedel , Will Deacon , Robin Murphy , Alyssa Ross , virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, iommu@lists.linux.dev, x86@kernel.org, Spectrum OS Development Message-ID: <8c3b08d5-24aa-4db2-84e1-dfd1d2c52065@gmail.com> Subject: Re: Virtio-IOMMU interrupt remapping design References: <> <20250616132031.GB1354058@ziepe.ca> In-Reply-To: <20250616132031.GB1354058@ziepe.ca> --------------VPcIoc0R31Z8BiMlGxM7FjrE Content-Type: multipart/mixed; boundary="------------m3JJGSh0ugchDzKD00qJ82OL" --------------m3JJGSh0ugchDzKD00qJ82OL Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 6/16/25 09:20, Jason Gunthorpe wrote: > On Sun, Jun 15, 2025 at 02:47:15PM -0400, Demi Marie Obenour wrote: >=20 >> Is a paravirtualized IOMMU with interrupt remapping something that mak= es >> sense? >=20 > IMHO linking interrupt remapping to the iommu is a poor design, > interrupt routing belongs in the irq subsystem, not in the iommu. I agree. > The fact AMD and Intel both coupled their interrupt routing to their > iommu hardware is just a weird design decision. ARM didn't do this, > for instance. Arm did the right thing here, IMO. > So I would not try to do this at all, you should have a > para-virtualized IRQ interface, not an extension to virtio-iommu > adding interrupt handling. :\ I don't disagree at all. > AFAIK hyperv shows how to build something like this. Would this need KVM patches? I'm concerned that implementing this in userspace would interact badly with the irqfd fast path. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------m3JJGSh0ugchDzKD00qJ82OL 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----- iQIzBAEBCAAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmhQTB0ACgkQszaHOrMp 8lN5oQ//ZLKaKakkI5pjCH8cDvKpwCN/ZDLx8bEjpNCd9WzlRzQGIVXWgLiMd0WL LPeQnSNANRFBQ4PVIp2Zk9765tFx6+HldcFoW1yR12vCmGrJK1pKFH2v4sGQ4/Q1 mj1JUEHSGRlPUSNluHDl0x5lPdpQdflzFjnTJv/ybToPxApysNccdITTQx70WZ6o CBQ6uQmjY3ZnxRADOLFZlCP0CEjxILEWdCziu5GTUk+7CjQsFq1BPWAOMphPqbah dp+/H/eDkxEW/lC1C5BvmCy5BFqGeXaGxpk4HByTRXrer+x6EdPlz9FG72m1lU5Z 4hJsevN/aezuQ9FR33sjvu74PjrPZTzZaKIsssGc+7IUUo6uhjg9kZLPXUWC8wj+ MAF+pJcewV7LVnbaENAGiL5SK69dXxDPw44ZRaB7QwWUIu63ct3iCexjAfEgxHmx MbiFlfyuszXydbfRxOui0UIO2jpVaIaQHj0Ni+uKRe3SddXUnhWywNO27FDsRMDD 3tQG97GDH2+JP4rRYBDr+ifeZGQPyNK3Oeuj+D/TNcTZytV/uXsJqc4Ql0k2y0un 8+DSbfUaFHekXvBDx6Ko2FutFj3tIJnO1fq1ny9dVRTxgvY6hbfuX4D2Xoz6SH1/ ZU8/Nz4+Fqy2U7d8+vtkv1PEvJBt99q4bIIKLCkaj4Xbfk/veek= =08Mu -----END PGP SIGNATURE----- --------------2moOxTn903NZZGa7yAz6amQg--