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94 lines
4.6 KiB
Markdown
94 lines
4.6 KiB
Markdown
# openwrt-hv-tools
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Hyper-V Linux Guest Services for OpenWrt
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## About `hv_fcopy_uio_daemon`
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This should be used on Linux 6.10 or later (6.12 WIP for OpenWrt), but currently it does not work at all.
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### Compiling
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Currently it does not compile with OpenWrt toolchain (complaining about `__always_inline`). Seems can be solved by:
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```diff
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diff --git a/tools/hv/vmbus_bufring.c b/tools/hv/vmbus_bufring.c
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index bac32c1109df..ee9f48511a71 100644
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--- a/tools/hv/vmbus_bufring.c
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+++ b/tools/hv/vmbus_bufring.c
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@@ -58,7 +58,7 @@ void vmbus_br_setup(struct vmbus_br *br, void *buf, unsigned int blen)
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br->dsize = blen - sizeof(struct vmbus_bufring);
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}
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-static inline __always_inline void
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+static inline __attribute__((always_inline)) void
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rte_smp_mb(void)
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{
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asm volatile("lock addl $0, -128(%%rsp); " ::: "memory");
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```
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### Running
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It requires some `uio` related `vmbus` device which unfortunately I don't know how to initialize.
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```
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Wed Apr 16 23:30:57 2025 user.info HV_UIO_FCOPY: starting; pid is:5065
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Wed Apr 16 23:30:57 2025 user.err HV_UIO_FCOPY: Failed to open directory (errno=No such file or directory).
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Wed Apr 16 23:30:57 2025 user.err HV_UIO_FCOPY: open /dev/ failed; error: 21 Is a directory
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```
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Tried following [Generic Hyper-V UIO driver](https://www.kernel.org/doc/html/v6.12/driver-api/uio-howto.html#generic-hyper-v-uio-driver) but no `uio*` seen under `/dev` or `/sys/bus/vmbus/devices/eb765408-105f-49b6-b4aa-c123b64d17d4` ([source](https://github.com/torvalds/linux/blob/v6.12/tools/hv/hv_fcopy_uio_daemon.c#L40))
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```
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# ls -al /sys/bus/vmbus/devices/eb765408-105f-49b6-b4aa-c123b64d17d4/
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drwxr-xr-x 4 root root 0 Apr 16 23:47 .
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drwxr-xr-x 22 root root 0 Apr 16 23:47 ..
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-r--r--r-- 1 root root 4096 Apr 16 23:47 channel_vp_mapping
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drwxr-xr-x 3 root root 0 Apr 16 23:47 channels
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-r--r--r-- 1 root root 4096 Apr 16 23:47 class_id
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-r--r--r-- 1 root root 4096 Apr 16 23:47 device
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-r--r--r-- 1 root root 4096 Apr 16 23:47 device_id
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-rw-r--r-- 1 root root 4096 Apr 16 23:49 driver_override
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-r--r--r-- 1 root root 4096 Apr 16 23:47 id
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-r--r--r-- 1 root root 4096 Apr 16 23:47 in_intr_mask
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-r--r--r-- 1 root root 4096 Apr 16 23:47 in_read_bytes_avail
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-r--r--r-- 1 root root 4096 Apr 16 23:47 in_read_index
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-r--r--r-- 1 root root 4096 Apr 16 23:47 in_write_bytes_avail
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-r--r--r-- 1 root root 4096 Apr 16 23:47 in_write_index
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-r--r--r-- 1 root root 4096 Apr 16 23:47 modalias
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-r--r--r-- 1 root root 4096 Apr 16 23:47 out_intr_mask
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-r--r--r-- 1 root root 4096 Apr 16 23:47 out_read_bytes_avail
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-r--r--r-- 1 root root 4096 Apr 16 23:47 out_read_index
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-r--r--r-- 1 root root 4096 Apr 16 23:47 out_write_bytes_avail
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-r--r--r-- 1 root root 4096 Apr 16 23:47 out_write_index
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drwxr-xr-x 2 root root 0 Apr 16 23:47 power
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-r--r--r-- 1 root root 4096 Apr 16 23:47 state
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lrwxrwxrwx 1 root root 0 Apr 16 23:47 subsystem -> ../../../../../../bus/vmbus
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-rw-r--r-- 1 root root 4096 Apr 16 23:47 uevent
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-r--r--r-- 1 root root 4096 Apr 16 23:47 vendor
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```
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Manually binding device does not work as well:
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```
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# echo -n eb765408-105f-49b6-b4aa-c123b64d17d4 > /sys/bus/vmbus/drivers/uio_hv_generic/bind
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ash: write error: No such device
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```
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At the same time this seems also not working on Ubuntu 25.04 Beta (Running `linux-azure` kernel variant). The problem seems same as running on OpenWrt:
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```
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Apr 16 16:44:55 yichya-ubuntu sudo[1146]: yichya : TTY=tty1 ; PWD=/usr/lib/linux-azure-tools-6.14.0-1004 ; USER=root ; COMMAND=./hv_fcopy_uio_daemon -n
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Apr 16 16:44:55 yichya-ubuntu sudo[1146]: pam_unix(sudo:session): session opened for user root(uid=0) by yichya(uid=1000)
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Apr 16 16:44:55 yichya-ubuntu HV_UIO_FCOPY[1148]: starting; pid is:1148
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Apr 16 16:44:55 yichya-ubuntu HV_UIO_FCOPY[1148]: Failed to open directory (errno=No such file or directory).
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Apr 16 16:44:55 yichya-ubuntu HV_UIO_FCOPY[1148]: open /dev/ failed; error: 21 Is a directory
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```
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Not sure if it's related to Hyper-V version (Tried both on Windows 11 24H2 and Windows Server 2022, both not working) or kernel configuration.
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### TL;DR
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Since it is broken and not very useful, there's an option in this package to exclude any `fcopy` implementation.
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Legacy `hv_fcopy_daemon` does not work on Linux 6.10 or later because it needs `/dev/vmbus/hv_fcopy` which is available only on older kernel versions.
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