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Jamie LiuandgVisor bot
134f74b24b
- Add /proc/devices.
- Provide /proc/driver/nvidia/params when nvproxy is enabled. CUDA-using
applications already try to open this file, but silently tolerate its
non-existence. However, both the IMEX daemon and IMEX-using applications are
believed to require this file for ImexChannelCount. (libnvidia-container
additionally provides /proc/driver/nvidia/{registry,version}, but we have yet
to see any application use these.)
- Add new capability nvconf.CapFabricIMEXManagement. When enabled, provide
/proc/driver/nvidia/capabilities/fabric-imex-mgmt and the corresponding
/dev/nvidia-caps/nvidia-cap#.
- Add support for /dev/nvidia-caps-imex-channels/ (irrespective of the new
capability, since IMEX-using applications need this directory as well).
- Allow devutil.GoferClient.OpenAt() to take a relative path (i.e. containing
more than one path component) rather than only a basename, since this is
needed to open /dev/nvidia-caps/*.
- Add nvproxy support for all known-required controls, and all allocation
classes to which those controls correspond.
This CL is specifically for nvidia-imex, the "NVIDIA IMEX Service for NVLink
Networks" (or "IMEX daemon"); applications using IMEX haven't been tested yet,
and may require additional allocation classes / control commands, or some
existing ones marked as requiring CapFabricIMEXManagement as being enabled more
broadly.
PiperOrigin-RevId: 859286209
62 lines
2.3 KiB
Go
62 lines
2.3 KiB
Go
// Copyright 2026 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package nvproxy
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import (
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"fmt"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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)
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// ProcfsInfo contains information about procfs files maintained by nvproxy.
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type ProcfsInfo struct {
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// StaticFiles maps paths relative to /proc/driver/nvidia/ to the contents of
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// files at those paths.
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StaticFiles map[string]string
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}
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// ProcfsInfoFromVFS returns procfs information for nvproxy devices registered
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// in vfsObj. If ProcfsInfoFromVFS returns nil, nvproxy.Register(vfsObj) has
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// not been called.
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func ProcfsInfoFromVFS(vfsObj *vfs.VirtualFilesystem) *ProcfsInfo {
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nvp := nvproxyFromVFS(vfsObj)
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if nvp == nil {
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return nil
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}
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procfsInfo := &ProcfsInfo{
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StaticFiles: map[string]string{
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"params": nvp.procDriverNvidiaParams,
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},
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}
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if nvp.devInfo.HaveFabricIMEXManagement {
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procfsInfo.StaticFiles["capabilities/fabric-imex-mgmt"] = procfsCapability(nvp.devInfo.FabricIMEXManagementDevMinor, 0o400)
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}
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return procfsInfo
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}
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// procfsCapability returns the contents of a file in
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// /proc/driver/nvidia/capabilities/ representing the capability with the given
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// device minor number in /dev/nvidia-caps/. mode is the mode passed to
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// kernel-open/nvidia/os-interface.c:os_nv_cap_create_file_entry() =>
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// kernel-open/nvidia/nv-caps.c:nv_cap_create_file_entry() and stored in
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// nv_cap_t::permissions, which does not include file type and is not updated
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// by file mode changes in /dev/nvidia-caps/.
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func procfsCapability(devMinor, mode uint32) string {
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// Force DeviceFileModify to 0 regardless of the host value. This is
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// consistent with our treatment of ModifyDeviceFiles in
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// /proc/driver/nvidia/params.
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return fmt.Sprintf("DeviceFileMinor: %d\nDeviceFileMode: %d\nDeviceFileModify: 0\n", devMinor, mode)
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}
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