genwqe_write_vreg(9)

💅 genwqe_write_vreg(9) — like, the Kernel API Manual, bestie ✨

Okay so picture this: we're in the genwqe corner of the kernel, and this little function is the main character. It writes a register in the virtual window, and it's in the Kernel API Manual. Let's get into it 🫶

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✨ NAME ✨

genwqe_write_vreg — write a register in the virtual window, no cap 💖

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🌸 SYNOPSIS 🌸

int genwqe_write_vreg (struct genwqe_dev *cd , u32 reg , u64 val , int
func );

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🎀 ARGUMENTS 🎀

• cd — the genwqe device descriptor. It's giving "who am I writing to" energy 💫
• reg — the register (byte) offset within BAR. Yes, byte offset, write that down 📝
• val — the value to write. The actual payload, the moment, the slay 🔥
• func — the PCI virtual function. Know your function, iykyk 💅

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🦋 DESCRIPTION 🦋

Bestie, listen, this is important: these registers are only accessible to the PF through the VF-window. It is not intended for the VF to access. Like, that's just not the vibe — don't come for what isn't yours 🙈 So if you're the VF, this is your cue to exit stage left.

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🌈 SEE ALSO 🌈

Kernel file ./drivers/misc/genwqe/card_utils.c and its whole friend group, all in their (9) era:

• __genwqe_writeq(9)
• __genwqe_readq(9)
• __genwqe_writel(9)
• __genwqe_readl(9)
• genwqe_read_app_id(9)
• genwqe_init_crc32(9)
• genwqe_crc32(9)
• genwqe_free_sync_sgl(9)
• genwqe_user_vmap(9)
• genwqe_user_vunmap(9)
• genwqe_card_type(9)
• genwqe_card_reset(9)
• genwqe_set_interrupt_capability(9)
• genwqe_reset_interrupt_capability(9)
• set_reg_idx(9)
• genwqe_ffdc_buff_size(9)
• genwqe_ffdc_buff_read(9)
• genwqe_read_vreg(9)
• genwqe_base_clock_frequency(9)
• genwqe_stop_traps(9)
• genwqe_start_traps(9)

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And that's the whole page, periodt! 🎀 This absolute icon of a manpage lives in ./drivers/misc/genwqe, got dated October 2026, and answers to genwqe_write_vreg(9). Go off, king 👑💖