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3 months, 1 week

1
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0 0

Share vs Lend - Vsock memory sharing over virtio-msg-ffa

by Viresh Kumar

Hello, I am trying to get feedback / ideas (specially from the people in --to) before I reach out to LKML. Problem statement: Share memory (dma-buf/dma-heap fd) over VSock (over virtio-msg-ffa). Current status: I have implemented the first version [1]/[2]. The system-heap memory is successfully shared with OPTEE, test setup available here [3]. Workflow: Userspace: open("/dev/dma_heap/system", O_RDWR) + ioctl(heap_fd, DMA_HEAP_IOCTL_ALLOC, &alloc) + sendmsg(sock, &msg, 0) // msg: SCM_VSOCK_SHMEM / VSOCK_SHMEM_TYPE_FFA / VSOCK_SHMEM_SUBOP_OFFER Kernel: vsock_sendmsg_shmem(vsk, msg) | vsk->transport->map_dma_buf(dmabuf) | virtio_transport_map_dma_buf(dmabuf) | dma_buf_attach(dmabuf, dev); // Vsock's underlying device - virtio-msg device + dma_buf_map_attachment_unlocked(dbuf->attach, DMA_BIDIRECTIONAL); | system_heap_map_dma_buf(attach, dir); | dma_map_sgtable(attachment->dev, table, dir, attrs=0); | virtio_msg_dma_map_sg_dev(dev, sgl, nents, dir, attrs); // FFA dma-ops | ffa_dev->ops->mem_ops->memory_share(&args); + vmfdev->send(vmfdev, request, response, &vmfdev->idata); The memory is shared with FFA SHARE type. This doesn't require a custom heap and works with any DMA heap/buf, system heap is just an example here. FFA supports LEND-ing the memory as well and Google needs it. And this is where I am _blocked_ right now and need help. We need to support both SHARE (both sides can access memory) and LEND (Linux doesn't access it any further - unmapped) mechanisms and I am not sure how to move forward. - We can pass the share-type from userspace and that can reach up to vsock / dma-buf (with minor API change to dma_buf_map_attachment_unlocked()) / system-heap. - But after that the standard dma_map_sgtable() call takes only one configurable parameter, `attributes` (which is set to 0 for now by system heap). There is nothing else which I can use to pass the flag to FFA specific DMA OPs. - I thought maybe I can create a new DMA attribute: `DMA_ATTR_MEM_LEND`, which can be passed in the `attr` field and that will work I guess. - But I am not sure if it would be acceptable upstream to add a new attribute for this. - And so I am looking for some ideas. -- viresh [1] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git/log/?h=vi… [2] Patches of interest - vsock: Add shared-memory support for virtio and loopback - virtio-msg: ffa: Add device DMA-OPS [3] https://linaro.atlassian.net/wiki/spaces/HVAC/pages/30372528129

3 months, 2 weeks

5
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[PATCH v1 0/4] virtio-msg transport layer

by Bill Mills

This series adds the virtio-msg transport layer. The individuals and organizations involved in this effort have had difficulty in using the existing virtio-transports in various situations and desire to add one more transport that performs its transport layer operations by sending and receiving messages. Implementations of virtio-msg will normally be done in multiple layers: * common / device level * bus level The common / device level defines the messages exchanged between the driver and a device. This common part should lead to a common driver holding most of the virtio specifics and can be shared by all virtio-msg bus implementations. The kernel implementation in [3] shows this separation. As with other transport layers, virtio-msg should not require modifications to existing virtio device implementations (virtio-net, virtio-blk etc). The common / device level is the main focus of this version of the patch series. The virtio-msg bus level implements the normal things a bus defines (enumeration, dma operations, etc) but also implements the message send and receive operations. A number of bus implementations are envisioned, some of which will be reusable and general purpose. Other bus implementations might be unique to a given situation, for example only used by a PCIe card and its driver. How much of the bus level should be described in the virtio spec is one item we wish to discuss. This draft takes a middle approach by describing the bus level and defining some standard bus level messages that MAY be used by the bus. It also describes a range of bus messages that are implementation dependent. The standard bus messages are an effort to avoid different bus implementations doing the same thing in different ways for no good reason. However the different environments will require different things. Instead of trying to anticipate all needs and provide something very abstract, we think implementation specific messages will be needed at the bus level. Over time, if we see similar messages across multiple bus implementations, we will move to standardize a bus level message for that. We are working on a few reusable bus implementations: * virtio-msg-ffa based on Arm FF-A interface for use between: * normal world and secure world * host and VM or VM to VM * Can be used w/ or with out a hypervisor * Any Hypervisor that implements FF-A can be used * We have this working with pKVM and Xen * We have this working with Trusty and OP-TEE * virtio-msg-amp for use between heterogenous systems * The main processors and its co-processors on an AMP SOC * Two or more systems connected via PCIe * Minimal requirements: bi-directional interrupts and at least one shared memory area * hvac-demo has 2 demos of this * This is working on two hardware platforms * virtio-msg-loopback for userspace implemented devices * Allows user space to provide devices to its own kernel * This is similar to fuse, cuse or loopback block devices but for virtio * hvac-demo has a demo We also anticipate a few more: * virtio-msg-xen specific to Xen * Usable on any Xen system (including x86 where FF-A does not exist) * Using Xen events and page grants * virtio-msg over admin virtqueues * This allows any virtio-pci device that supports admin virtqueues to also support a virtio-msg bus that supports sub devices * [We are looking for collaborators for this work] Changes since RFC2: Spec Functional: * Made the common message header 8 bytes and added a token for optional use when parallel outstanding requests are possible * Made the 8 byte fields align to 8 byte offsets. This effects the {SET,GET}_VQUEUE messages * Many conformance cases have been tightened. Spec Editorial: * Major restructure to better align with virtio spec * Conformance model now matches other transports * Use C structures to define messages instead of tables * Added a section to describe how responses are matched to requests This includes the use of the new token field * Redefined / better described error handling between transport and bus layers to eliminate the need for the bus to generate fake response messages * Included editorial feedback from RFC2 Eco-system: * Added virtio-msg-loopback demo * Arm has published the first draft of the virtio-msg over FFA spec [6] * virtio-msg over FFA has been demonstrated with both Trusty and OP-TEE secure world * LKML RFC has been sent [7] * QEMU RFC has been sent [8] This is the first non-RFC patch series. The known short comings have been addressed. We ask for review in earnest on this series and thank you for any feedback you can provide. Background info and work in progress implementations: * HVAC project page with intro slides [1] * HVAC demo repo w/ instructions in README.md [2] * Kernel w/ virtio-msg common level and ffa support [3] * QEMU w/ support for one form of virtio-msg-amp [4] * Portable RTOS library w/ one form of virtio-msg-amp [5] In addition to the QEMU system based demos in the hvac-demo repo, we also have two hardware systems running: * AMD x86 + AMD Arm Versal connected via PCIe * ST STM32MP157 A7 Linux using virtio-i2c provided by M4 Zephyr Please note that although the demos work, a few have not been aligned with this version of the spec. [1] https://linaro.atlassian.net/wiki/spaces/HVAC/overview [2] https://github.com/wmamills/hvac-demo [3] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git/log/?h=vi… [4] https://github.com/edgarigl/qemu/commits/edgar/virtio-msg-rfc/ [5] https://github.com/arnopo/open-amp/commits/virtio-msg/ [6] https://documentation-service.arm.com/static/68f647791134f773ab3f0a7c [7] https://lore.kernel.org/all/cover.1753865268.git.viresh.kumar@linaro.org/ [8] https://mail.gnu.org/archive/html/qemu-devel/2025-10/msg07438.html Bertrand Marquis (2): virtio-msg: add new command for bus normative virtio-msg: add conformance entries in conformance chapter Bill Mills (2): virtio-msg: Add virtio-msg, a message based virtio transport layer virtio-msg: link virtio-msg content commands.tex | 3 +- conformance.tex | 105 ++- content.tex | 1 + transport-msg.tex | 1640 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 1746 insertions(+), 3 deletions(-) create mode 100644 transport-msg.tex -- 2.34.1

3 months, 3 weeks

2
7
0 0

[PATCH v1 0/8] virtio-msg transport layer

by Bill Mills

This series adds the virtio-msg transport layer. The individuals and organizations involved in this effort have had difficulty in using the existing virtio-transports in various situations and desire to add one more transport that performs its transport layer operations by sending and receiving messages. Implementations of virtio-msg will normally be done in multiple layers: * common / device level * bus level The common / device level defines the messages exchanged between the driver and a device. This common part should lead to a common driver holding most of the virtio specifics and can be shared by all virtio-msg bus implementations. The kernel implementation in [3] shows this separation. As with other transport layers, virtio-msg should not require modifications to existing virtio device implementations (virtio-net, virtio-blk etc). The common / device level is the main focus of this version of the patch series. The virtio-msg bus level implements the normal things a bus defines (enumeration, dma operations, etc) but also implements the message send and receive operations. A number of bus implementations are envisioned, some of which will be reusable and general purpose. Other bus implementations might be unique to a given situation, for example only used by a PCIe card and its driver. How much of the bus level should be described in the virtio spec is one item we wish to discuss. This draft takes a middle approach by describing the bus level and defining some standard bus level messages that MAY be used by the bus. It also describes a range of bus messages that are implementation dependent. The standard bus messages are an effort to avoid different bus implementations doing the same thing in different ways for no good reason. However the different environments will require different things. Instead of trying to anticipate all needs and provide something very abstract, we think implementation specific messages will be needed at the bus level. Over time, if we see similar messages across multiple bus implementations, we will move to standardize a bus level message for that. We are working on a few reusable bus implementations: * virtio-msg-ffa based on Arm FF-A interface for use between: * normal world and secure world * host and VM or VM to VM * Can be used w/ or with out a hypervisor * Any Hypervisor that implements FF-A can be used * We have this working with pKVM and Xen * We have this working with Trusty and OP-TEE * virtio-msg-amp for use between heterogenous systems * The main processors and its co-processors on an AMP SOC * Two or more systems connected via PCIe * Minimal requirements: bi-directional interrupts and at least one shared memory area * hvac-demo has 2 demos of this * This is working on two hardware platforms * virtio-msg-loopback for userspace implemented devices * Allows user space to provide devices to its own kernel * This is similar to fuse, cuse or loopback block devices but for virtio * hvac-demo has a demo We also anticipate a few more: * virtio-msg-xen specific to Xen * Usable on any Xen system (including x86 where FF-A does not exist) * Using Xen events and page grants * virtio-msg over admin virtqueues * This allows any virtio-pci device that supports admin virtqueues to also support a virtio-msg bus that supports sub devices * [We are looking for collaborators for this work] Changes since RFC2: Spec Functional: * Made the common message header 8 bytes and added a token for optional use when parallel outstanding requests are possible * Made the 8 byte fields align to 8 byte offsets. This effects the {SET,GET}_VQUEUE messages * Many conformance cases have been tightened. Spec Editorial: * Major restructure to better align with virtio spec * Conformance model now matches other transports * Use C structures to define messages instead of tables * Added a section to describe how responses are matched to requests This includes the use of the new token field * Redefined / better described error handling between transport and bus layers to eliminate the need for the bus to generate fake response messages * Included editorial feedback from RFC2 Eco-system: * Added virtio-msg-loopback demo * Arm has published the first draft of the virtio-msg over FFA spec [6] * virtio-msg over FFA has been demonstrated with both Trusty and OP-TEE secure world * LKML RFC has been sent [7] * QEMU RFC has been sent [8] This is the first non-RFC patch series. The known short comings have been addressed. We ask for review in earnest on this series and thank you for any feedback you can provide. Background info and work in progress implementations: * HVAC project page with intro slides [1] * HVAC demo repo w/ instructions in README.md [2] * Kernel w/ virtio-msg common level and ffa support [3] * QEMU w/ support for one form of virtio-msg-amp [4] * Portable RTOS library w/ one form of virtio-msg-amp [5] In addition to the QEMU system based demos in the hvac-demo repo, we also have two hardware systems running: * AMD x86 + AMD Arm Versal connected via PCIe * ST STM32MP157 A7 Linux using virtio-i2c provided by M4 Zephyr Please note that although the demos work, a few have not been aligned with this version of the spec. [1] https://linaro.atlassian.net/wiki/spaces/HVAC/overview [2] https://github.com/wmamills/hvac-demo [3] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git/log/?h=vi… [4] https://github.com/edgarigl/qemu/commits/edgar/virtio-msg-rfc/ [5] https://github.com/arnopo/open-amp/commits/virtio-msg/ [6] https://documentation-service.arm.com/static/68f647791134f773ab3f0a7c [7] https://lore.kernel.org/all/cover.1753865268.git.viresh.kumar@linaro.org/ [8] https://mail.gnu.org/archive/html/qemu-devel/2025-10/msg07438.html Alex Bennée (1): local: add local build help and github automation (!UPSTREAM) Bertrand Marquis (2): virtio-msg: add new command for bus normative virtio-msg: add conformance entries in conformance chapter Bill Mills (5): email: Add script and cover letter for RFC1 email: adjust cover letter for RFC2 email: adjust cover letter for RFC3 virtio-msg: Add virtio-msg, a message based virtio transport layer virtio-msg: link virtio-msg content .github/PULL_REQUEST_TEMPLATE.md | 14 +- .github/workflows/deploy.yaml | 38 + .github/workflows/test.yml | 15 + .prjinfo/sendmail/cover.txt | 125 +++ .prjinfo/sendmail/send.sh | 57 ++ Makefile | 33 + REVISION | 2 +- commands.tex | 3 +- conformance.tex | 105 +- content.tex | 1 + make-setup-generated.sh | 31 +- makeall.sh | 4 +- makehtml.sh | 2 +- makepdf.sh | 2 +- transport-msg.tex | 1640 ++++++++++++++++++++++++++++++ 15 files changed, 2052 insertions(+), 20 deletions(-) create mode 100644 .github/workflows/deploy.yaml create mode 100644 .github/workflows/test.yml create mode 100644 .prjinfo/sendmail/cover.txt create mode 100755 .prjinfo/sendmail/send.sh create mode 100644 Makefile create mode 100644 transport-msg.tex -- 2.34.1

3 months, 3 weeks

1
9
0 0

[PATCH v1 0/4] virtio-msg transport layer

by Bill Mills

This series adds the virtio-msg transport layer. The individuals and organizations involved in this effort have had difficulty in using the existing virtio-transports in various situations and desire to add one more transport that performs its transport layer operations by sending and receiving messages. Implementations of virtio-msg will normally be done in multiple layers: * common / device level * bus level The common / device level defines the messages exchanged between the driver and a device. This common part should lead to a common driver holding most of the virtio specifics and can be shared by all virtio-msg bus implementations. The kernel implementation in [3] shows this separation. As with other transport layers, virtio-msg should not require modifications to existing virtio device implementations (virtio-net, virtio-blk etc). The common / device level is the main focus of this version of the patch series. The virtio-msg bus level implements the normal things a bus defines (enumeration, dma operations, etc) but also implements the message send and receive operations. A number of bus implementations are envisioned, some of which will be reusable and general purpose. Other bus implementations might be unique to a given situation, for example only used by a PCIe card and its driver. How much of the bus level should be described in the virtio spec is one item we wish to discuss. This draft takes a middle approach by describing the bus level and defining some standard bus level messages that MAY be used by the bus. It also describes a range of bus messages that are implementation dependent. The standard bus messages are an effort to avoid different bus implementations doing the same thing in different ways for no good reason. However the different environments will require different things. Instead of trying to anticipate all needs and provide something very abstract, we think implementation specific messages will be needed at the bus level. Over time, if we see similar messages across multiple bus implementations, we will move to standardize a bus level message for that. We are working on a few reusable bus implementations: * virtio-msg-ffa based on Arm FF-A interface for use between: * normal world and secure world * host and VM or VM to VM * Can be used w/ or with out a hypervisor * Any Hypervisor that implements FF-A can be used * We have this working with pKVM and Xen * We have this working with Trusty and OP-TEE * virtio-msg-amp for use between heterogenous systems * The main processors and its co-processors on an AMP SOC * Two or more systems connected via PCIe * Minimal requirements: bi-directional interrupts and at least one shared memory area * hvac-demo has 2 demos of this * This is working on two hardware platforms * virtio-msg-loopback for userspace implemented devices * Allows user space to provide devices to its own kernel * This is similar to fuse, cuse or loopback block devices but for virtio * hvac-demo has a demo We also anticipate a few more: * virtio-msg-xen specific to Xen * Usable on any Xen system (including x86 where FF-A does not exist) * Using Xen events and page grants * virtio-msg over admin virtqueues * This allows any virtio-pci device that supports admin virtqueues to also support a virtio-msg bus that supports sub devices * [We are looking for collaborators for this work] Changes since RFC2: Spec Functional: * Made the common message header 8 bytes and added a token for optional use when parallel outstanding requests are possible * Made the 8 byte fields align to 8 byte offsets. This effects the {SET,GET}_VQUEUE messages Spec Editorial: * Major restructure to better align with virtio spec * Conformance model now matches * Use C structures to define messages instead of tables * Added a section to describe how responses are matched to requests This includes the use of the new token field * Redefined / better described error handling between transport and bus layers to eliminate the need for the bus to generate fake response messages * Included editorial feedback from RFC2 Eco-system: * Add virtio-msg-loopback demo * Arm has published the first draft of the virtio-msg over FFA spec * virtio-msg over FFA has been demonstrated with both Trusty and OP-TEE secure world * QEMU RFCv1 has been sent * LKML RFCs have been sent Background info and work in progress implementations: * HVAC project page with intro slides [1] * HVAC demo repo w/ instructions in README.md [2] * Kernel w/ virtio-msg common level and ffa support [3] * QEMU w/ support for one form of virtio-msg-amp [4] * Portable RTOS library w/ one form of virtio-msg-amp [5] In addition to the QEMU system based demos in the hvac-demo repo, we also have two hardware systems running: * AMD x86 + AMD Arm Versal connected via PCIe * ST STM32MP157 A7 Linux using virtio-i2c provided by M4 Zephyr Please note that although the demos work, not all of them have been aligned with this version of the spec. [1] https://linaro.atlassian.net/wiki/spaces/HVAC/overview [2] https://github.com/wmamills/hvac-demo [3] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git/log/?h=vi… [4] https://github.com/edgarigl/qemu/commits/edgar/virtio-msg-new [5] https://github.com/arnopo/open-amp/commits/virtio-msg/ Bertrand Marquis (2): virtio-msg: add new command for bus normative virtio-msg: add conformance entries in conformance chapter Bill Mills (2): virtio-msg: Add virtio-msg, a message based virtio transport layer virtio-msg: link virtio-msg content commands.tex | 3 +- conformance.tex | 105 ++- content.tex | 1 + transport-msg.tex | 1640 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 1746 insertions(+), 3 deletions(-) create mode 100644 transport-msg.tex -- 2.34.1

4 months

1
4
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[RFC] Vsock: Which device should we use for mapping memory ?

by Viresh Kumar

Happy new year everyone, I have a few questions regarding the design of the whole memory sharing over Vsock work and looking to get some feedback before I spend time making the changes. The initial design (from Nov): - Initially I implemented a FFA based DMA heap (no DMA ops used), which would allocate memory and make direct FFA calls to send the memory to the other endpoint. - The userspace would open this heap, allocated dma-buf and pass its FD over Vsock. - The Vsock layer would then call ->shmem() (a new callback I added to dma-buf/heap, which will send memory over FFA and return ffa bus address), to get the metadata to be shared over Vsock. The current design: - In one of the calls Bertrand suggested to not create parallel paths for sending memory over FFA. Instead we should use the exiting dma-ops for FFA (used for virtqueue and reserved-mem) somehow. - I created a platform device (as a child of the FFA device) and assigned a new set of DMA ops to it (the only difference from reserved-mem ops is that we don't do swiotlb here and allocate fresh instead of the reserved mem). - This pdev is used by the DMA heap to allocate memory using dma_alloc_coherent() and that made sure everything got mapped correctly. - I still need a dma-buf helper to get the metadata to send over Vsock. The existing helper was renamed as s/shmem/shmem_data. The future design (that I have questions about): - The FFA specific DMA heap I now have doesn't do anything special compared to the system heap, mostly exactly same. - Which made me realize that probably I shouldn't add a new heap (Google can add one later if they really want) and the solution should work with any heap / dma-buf. - So, userspace should allocate heap from system-heap, get a dma-buf from it and send its FD. - The vsock layer then should attach this dma-buf to a `struct device` somehow and then call map_dma_buf() for the dma-buf. This requires the dma-ops of the device to be set to the FFA based dma-ops and then it should just work. - The tricky point is finding that device struct (as Vsock can't get it from dma-buf or usersapce). - One way, I think (still needs exploring but should be possible) is to use the struct device of the virtio-msg device over which Vsock is implemented. We can set the dma-ops of the virtio-msg device accordingly. - The system heap doesn't guarantee contiguous allocation though (which my FFA heap did) and so we will be required to send a scatter-gather list over vsock, instead of just one address and size (what I am doing right now). - Does this make sense ? Or if there is a use-case that this won't solve, etc ? -- viresh

4 months, 1 week

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Address space definition with virtio-msg and Xen grants ?

by Teddy Astie

Hello, I have some questions / feedback on the Xen side of virtio-msg. AFAIU virtio-msg defines a protocol in order to deal with discovery (optional) and configuration of the PV devices. But things are undefined regarding what is a "memory address". In Xen memory model with grants, each guest has its own memory space. The frontend shares memory pages with the backend through grants pages identified by grant references. So in a design based on grants, virtio addresses can't (or at least shouldn't) be guest physical address; but needs to be something derived on grants. A earlier design [1] was forging a address with the grant reference, but I feel it's not great, as it forces "map+unmap" cycles for temporary buffers thus has the same performance problem as Xen PV drivers (without persistent grants) where map+unmap cycles is a performance problem. And would make the address space very fragmented and in often limited to 4KB buffers. One idea that is already used by Xen displif (PV Display) is to have a "gref directory" and describe the address space on that. The gref directory is roughly a array of grant references (shared pages infos) that could describe a address space starting at 0, where each page is defined by a grant reference of the directory. That way, the backend can freely keep all or a part or the address space persistently mapped (or eventually map it all at once); and the address space is also contiguous which would help with >4KB buffers. Any thoughts ? [1] https://static.sched.com/hosted_files/xen2021/bf/Thursday_2021-Xen-Summit-v… -- Teddy Astie | Vates XCP-ng Developer XCP-ng & Xen Orchestra - Vates solutions web: https://vates.tech

4 months, 1 week

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Meeting Notes from Dec 18

by Bill Mills

All, I have updated the December wiki page with the notes from today. Any fixes are appreciated. https://linaro.atlassian.net/wiki/spaces/HVAC/pages/30510383105/2025-12+Upd… The page has a link and password to the recording and transcript if you want to see or hear the whole thing. Thanks, Bill -- Bill Mills Principal Technical Consultant, Linaro +1-240-643-0836 TZ: US Eastern Work Schedule: Tues/Wed/Thur

4 months, 4 weeks

1
0
0 0

[PATCH] dma-buf: add no-op stubs when CONFIG_DMA_SHARED_BUFFER is disabled

by Viresh Kumar

Move several dma-buf function declarations under CONFIG_DMA_SHARED_BUFFER and provide static inline no-op implementations for the disabled case to allow the callers to build when the feature is not compiled in. Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- include/linux/dma-buf.h | 116 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index d58e329ac0e7..06e494d8f6b0 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -568,6 +568,7 @@ static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf) return !!dmabuf->ops->pin; } +#ifdef CONFIG_DMA_SHARED_BUFFER struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct device *dev); struct dma_buf_attachment * @@ -609,4 +610,119 @@ int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, struct iosys_map *map); struct dma_buf *dma_buf_iter_begin(void); struct dma_buf *dma_buf_iter_next(struct dma_buf *dmbuf); + +#else +static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, + struct device *dev) +{ + return NULL; +} + +static inline struct dma_buf_attachment * +dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev, + const struct dma_buf_attach_ops *importer_ops, + void *importer_priv) +{ + return NULL; +} + +static inline void dma_buf_detach(struct dma_buf *dmabuf, + struct dma_buf_attachment *attach) { } + +static inline int dma_buf_pin(struct dma_buf_attachment *attach) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_unpin(struct dma_buf_attachment *attach) { } + +static inline struct dma_buf * +dma_buf_export(const struct dma_buf_export_info *exp_info) +{ + return NULL; +} + + +static inline int dma_buf_fd(struct dma_buf *dmabuf, int flags) +{ + return -EOPNOTSUPP; +} + + +static inline struct dma_buf *dma_buf_get(int fd) +{ + return NULL; +} + +static inline void dma_buf_put(struct dma_buf *dmabuf) { } + +static inline struct sg_table * +dma_buf_map_attachment(struct dma_buf_attachment *, enum dma_data_direction) +{ + return NULL; +} + +static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *, + struct sg_table *, + enum dma_data_direction) { } + +static inline void dma_buf_move_notify(struct dma_buf *dma_buf) { } + +static inline int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, + enum dma_data_direction dir) +{ + return -EOPNOTSUPP; +} + +static inline int dma_buf_end_cpu_access(struct dma_buf *dma_buf, + enum dma_data_direction dir) +{ + return -EOPNOTSUPP; +} + +static inline struct sg_table * +dma_buf_map_attachment_unlocked(struct dma_buf_attachment *attach, + enum dma_data_direction direction) +{ + return NULL; +} + +static inline void +dma_buf_unmap_attachment_unlocked(struct dma_buf_attachment *attach, + struct sg_table *sg_table, + enum dma_data_direction direction) { } + +static inline int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, + unsigned long) +{ + return -EOPNOTSUPP; +} + +static inline int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map) +{ } + +static inline int dma_buf_vmap_unlocked(struct dma_buf *dmabuf, + struct iosys_map *map) +{ + return -EOPNOTSUPP; +} + +static inline void dma_buf_vunmap_unlocked(struct dma_buf *dmabuf, + struct iosys_map *map) { } + +static inline struct dma_buf *dma_buf_iter_begin(void) +{ + return NULL; +} + +static inline struct dma_buf *dma_buf_iter_next(struct dma_buf *dmbuf) +{ + return NULL; +} +#endif /* CONFIG_DMA_SHARED_BUFFER */ #endif /* __DMA_BUF_H__ */ -- 2.31.1.272.g89b43f80a514

5 months, 2 weeks

1
0
0 0

PoC: Memory sharing: vsock + virtio-msg + FF-A + dma-heap

by Viresh Kumar

Hello, I was able to successfully test memory sharing over Vsock, implemented over a virtio message FFA transport. The memory is shared, as an FD, from Linux userspace (via a FFA specific DMA HEAP) and is received in OP-TEE as a buffer, which prints the string written by Linux. Steps to reproduce: - Jens shared an OP-TEE based setup few days back [1]. Reproduce it first. - Migrate to my branches for the following repositories within that: - build, optee_os, optee_test - Path to my repos: git@github.com:vireshk/ - branch: vsock/shmem - Migrate to my linux repo: git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git virtio/msg - Repeat the same test from Jens's setup: "xtest 2005" - The firmware side will print: Hello from shared memory via FD! This string was written by the Linux userspace in the memory provided by FFA DMA HEAP. Thanks. -- viresh [1] https://linaro.atlassian.net/browse/LEDGE-725

6 months, 2 weeks

2
1
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2026

2025

2024

Virtio-msg