vmw_port_hb_out(9)

💖 vmw_port_hb_out — the kernel API manual, bestie edition 💖

Okay so this one's a section 9 kernel API page, vmw_port_hb_out(9), and it's honestly giving "small function, big job" energy. Let's get into it 🫶

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✨ NAME ✨

vmw_port_hb_out — sends the message payload out either through the high-bandwidth port if it's available, or through the backdoor otherwise. Like, it'll take the fancy fast lane if it can, but it's got a backup route and it will use it. No cap 💅

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🌸 SYNOPSIS 🌸

unsigned long vmw_port_hb_out (struct rpc_channel *channel , const char
*msg , bool hb );

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🎀 ARGUMENTS 🎀

• channel — the rpc channel. That's the vibe, that's where everything's flowing through 💫
• msg — a NULL-terminated message. Note that: NULL-terminated, bestie. It knows where it ends on its own, you don't gotta tell it 😌
• hb — whether the high-bandwidth port is available. So you're the one telling it if the fast lane is open or not. Big responsibility honestly 👑

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🔥 RETURN 🔥

The port status. That's it, that's the tea ☕

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🦋 SEE ALSO 🦋

Kernel file ./drivers/gpu/drm/vmwgfx/vmwgfx_msg.c and honestly the whole friend group:

• vmw_open_channel(9)
• vmw_close_channel(9)
• vmw_port_hb_in(9)
• vmw_send_msg(9)
• vmw_recv_msg(9)
• vmw_host_get_guestinfo(9)
• vmw_host_printf(9)
• vmw_msg_ioctl(9)
• reset_ppn_array(9)
• hypervisor_ppn_reset_all(9)
• hypervisor_ppn_add(9)
• hypervisor_ppn_remove(9)
• mksstat_init_record_time(9)
• mksstat_init_kern_id(9)
• vmw_mksstat_get_kern_slot(9)
• vmw_mksstat_cleanup_descriptor(9)
• vmw_mksstat_remove_all(9)
• vmw_mksstat_reset_ioctl(9)
• vmw_mksstat_add_ioctl(9)
• vmw_mksstat_remove_ioctl(9)
• vmw_disable_backdoor(9)

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Fr fr, read the whole list — the mksstat crew and the ppn crew are all in there, and vmw_disable_backdoor(9) is literally the one that shuts down the backdoor route this function falls back on. iykyk 💀

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And that's the whole page, bestie! This one lives under ./drivers/gpu/drm/vmwgfx and the version/date situation is October 2026 — go off, calendar 👑✨