genwqe_read_vreg(9)

🌸 NAME 🌸

okay so bestie, this is genwqe_read_vreg(9) from the Kernel API Manual, and it is literally here to read a register in a virtual window. Iconic behavior, no cap. The one-line vibe is: genwqe_read_vreg — “Read register in virtual window.” 💅

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✨ SYNOPSIS ✨

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

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🎀 ARGUMENTS 🎀

• cd — the genwqe device descriptor, aka the main-character device context 🫶
• reg — the register (byte) offset within BAR, so yes, the byte offset, keep it cute and keep it exact ✨
• func — the PCI virtual function 🌈

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💅 DESCRIPTION 💅

okay, important note time, bestie — do not skip this:

Note, these registers are only accessible to the PF through the VF-window. It is not intended for the VF to access.

so yeah, that’s the whole boundary situation: PF-only through the VF-window, and the VF is not meant to be poking at these registers. not me being dramatic, that’s just the rule 😭🔥

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🦋 SEE ALSO 🦋

the kernel file is ./drivers/misc/genwqe/card_utils.c, and here’s the whole squad of related pages:

• __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_write_vreg(9)
• genwqe_base_clock_frequency(9)
• genwqe_stop_traps(9)
• genwqe_start_traps(9)

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Signed, sealed, delivered, mwah 💌 — this page is genwqe_read_vreg(9), source/version ./drivers/misc/genwqe, dated October 2026. periodt. 💖