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Fri, 04 Sep 2026 08:36:01 -0700 (PDT) Message-ID: Date: Fri, 4 Sep 2026 11:35:46 -0400 Precedence: bulk X-Mailing-List: virtio-comment@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] virtio-gpu: add flag to negotiate always passing ctx_id to RESOURCE_CREATE_BLOB To: Val Packett , virtio-comment@lists.linux.dev Cc: Gurchetan Singh , Sergio Lopez , Parav Pandit , dmitry.osipenko@collabora.com, mst@redhat.com, =?UTF-8?Q?Marek_Marczykowski-G=C3=B3recki?= , Alyssa Ross References: <20260903021442.423274-1-val@invisiblethingslab.com> <20260903021442.423274-3-val@invisiblethingslab.com> 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: <20260903021442.423274-3-val@invisiblethingslab.com> Content-Type: multipart/signed; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 9/2/26 22:14, Val Packett wrote: > virtio-gpu device backends typically use ctx_id to route commands to > different modules that implement distinct context types, e.g. > virglrenderer vs. cross-domain. Each module may require the blob > resources intented to use with it to be allocated through it as well. >=20 > Currently, this happens for host-only and default blobs which are > allocated from a context-specific local blob_id (e.g. an image > requirements blob in cross-domain). For guest-only resources however, > existing software (both the Linux kernel and the rutabaga-gfx library > used by device backends to implement virtio-gpu) allocates those with > ctx_id =3D=3D 0, which might be a different "default" context type from= the > one the resource is intended to be used with, e.g. when both > virglrenderer and cross-domain are present, the socket buffers used by > cross-domain were processed by virglrenderer which happens to work > but does not actually make sense. >=20 > Additionally we would like to support PRIME imported resources (udmabuf= s > or dGPU passthrough dma-bufs) being passed over cross-domain with the > CREATE_GUEST_HANDLE feature, which due to API constraints must also > perform the creation of a guest-only blob resource with ctx_id but > without blob_id. >=20 > Unfortunately changing this without breaking backwards compatibility > requires a flag to negotiate the use of the "fixed" convention. Otherwi= se > new guest kernel + old rutabaga would result in the command failing due= > to old rutabaga not expecting guest resources to be allocated w/ ctx_id= =2E >=20 > Signed-off-by: Val Packett > --- > device-types/gpu/description.tex | 9 +++++++++ > 1 file changed, 9 insertions(+) >=20 > diff --git a/device-types/gpu/description.tex b/device-types/gpu/descri= ption.tex > index 64e8c4ddecc5..c0ff3f34ec1c 100644 > --- a/device-types/gpu/description.tex > +++ b/device-types/gpu/description.tex > @@ -42,6 +42,9 @@ \subsection{Feature bits}\label{sec:Device Types / GP= U Device / Feature bits} > \item[VIRTIO_GPU_F_CREATE_GUEST_HANDLE (6)] guest-only blob resources > may be created with the VIRTIO_GPU_BLOB_FLAG_CREATE_GUEST_HANDLE fla= g. > Requires VIRTIO_GPU_F_RESOURCE_BLOB. > +\item[VIRTIO_GPU_F_BLOB_CTX_ID_FIX (7)] it is always safe to pass the > + current context ID to VIRTIO_GPU_CMD_RESOURCE_CREATE_BLOB, > + including for guest-only blobs. > \end{description} > =20 > \subsection{Device configuration layout}\label{sec:Device Types / GPU = Device / Device configuration layout} > @@ -673,6 +676,12 @@ \subsubsection{Device Operation: controlq}\label{s= ec:Device Types / GPU Device / > identified by the \field{blob_id}. The actual allocation is done via > VIRTIO_GPU_CMD_SUBMIT_3D. > =20 > +If VIRTIO_GPU_F_BLOB_CTX_ID_FIX has been negotiated, the \field{ctx_id= } of > +the \field{hdr} MUST always be filled in with the ID of the default re= ndering > +context associated with the current handle, if one exists. Otherwise, = it MUST > +only be filled when the \field{blob_id} has been filled to create a re= source > +from a rendering context local object. > + > The driver MUST inform the device if the blob resource is used for > memory access, sharing between driver instances and/or sharing with > other devices. This is done via the \field{blob_flags} field. Should VIRTIO_GPU_F_CREATE_GUEST_HANDLE require VIRTIO_GPU_F_BLOB_CTX_ID_= FIX? That could simplify drivers. --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------osB5P0GLBXTNhZK4ckdIweiB-- --------------0wIDeXHI8YAIrcmSG4Fqrz6p Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmqa5V0ACgkQszaHOrMp 8lPMhw//WYdso0KeR1hyRyDYtpDhmU2+uqORRrqE7O0Xc27tnDxmUZCvjrZL3uUi jIEueIfneMQuem02OFg6nvgGvssahQEavRjkVCjlxB7rpIQTKku0fgsdNRKWgNGI GRCH7avOMNoHw4PNG2CS8/1pXdcG94HXNOLQMGIy+WhQRI1amNcRXbSwzNs+CxzY rIBf1ooP5RY4g2UDLTDng0lLeKG6eTKFKFoGy4ZERsPX83Bo3Afr7BwvSfKI4MPe vQhbnD5sxiIivcIlVyTXK8qIo46ixUprV5PCw2J83+1BGhhrBfCtKsdAUV9TKR83 E7JOU0c5H/Qz+3rqEW3nwMg//GkIjKftub+fWUmgfv7tfhF0tvEc/HNH8+zzYxc7 ts8ZUZ0HmPVIjuyhtyYcQ6jxpqqWJUXN9HWEgQnTnigfSjvkBWCEYDTrVXhM/B40 BO7L2XFetoQQOno9kTsxmcNFg6PsVJK7+/RHTCreTI2TJoGOlDEok2Nq+W4kdzhc 7GVzSpSyCpSI0SkkcpuXJO0LPoptBL1rfzY/8nh0dlRdch57Nr96CDkH33eD76Fe OypBgzewnxfN5yqtBj5433nZnGX9OVC+k9n90zeeFV1pY/N27pYD6wqprLo2e5pC +MYzBJTB2xlbi8zuZx1EN1eibm6P37VnEjcRBih6Uok12RA5hvA= =kh9x -----END PGP SIGNATURE----- --------------0wIDeXHI8YAIrcmSG4Fqrz6p--