genwqe_is_privileged(9)

💅 genwqe_is_privileged — a Kernel API Manual moment

okay so bestie, welcome to the Kernel API Manual page for genwqe_is_privileged(9), and honestly? it's giving "tiny function, whole lore" ✨ buckle up 🎀

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🌸 NAME 🌸

genwqe_is_privileged — figure out which operation mode a PCI function is running in 👑

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✨ SYNOPSIS ✨

int genwqe_is_privileged (struct genwqe_dev *cd );

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🦋 ARGUMENTS 🦋

• cd — no cap, the original page literally leaves this one as -- undescribed -- 😭 so that's all we have, bestie. a struct genwqe_dev *, and the manpage does not describe it further. 🙈

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💖 DESCRIPTION 💖

okay so here's the whole vibe. GenWQE has one single PCI device id for both VFs and PFs, and that is lowkey a problem, because every other vendor gets to tell virtual function drivers and physical function drivers apart with their own individual pci device ids. GenWQE? just the one. for both. 🫠

so we distinguish modes other ways, and here's what we actually see in the wild 🔥

On Intel with SRIOV support, it looks like this:

• PF: is_physfn = 1 is_virtfn = 0
• VF: is_physfn = 0 is_virtfn = 1

On systems with no SRIOV support _and_ virtualized systems, it's this instead:

• is_physfn = 0 is_virtfn = 0

and then there's this little snippet, which is what the function actually uses to tell whether the card is running in privileged mode — either as a true PF, or in a virtualized system with full register access (e.g. currently on PowerPC 🧚):

if (pci_dev->is_virtfn) cd->is_privileged = 0; else cd->is_privileged =
(__genwqe_readq(cd, IO_SLU_BITSTREAM) != IO_ILLEGAL_VALUE);

periodt. that's the whole decision tree, and it's iconic honestly 💅

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🔥 SEE ALSO 🔥

go read these next, bestie, they're all connected iykyk 👑

• Kernel file ./drivers/misc/genwqe/card_base.h
• struct genwqe_reg(9)
• struct dma_mapping(9)
• struct ddcb_queue(9)
• struct genwqe_dev(9)
• enum genwqe_requ_state(9)
• struct genwqe_sgl(9)
• struct ddcb_requ(9)
• struct genwqe_file(9)
• genwqe_get_slu_id(9)
• genwqe_write_vreg(9)
• genwqe_read_vreg(9)
• __genwqe_execute_ddcb(9)
• __genwqe_execute_raw_ddcb(9)

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🌈 and that's a wrap, bestie!! this little page lives in ./drivers/misc/genwqe, it's dated October 2026, and it's chillin' under the genwqe_is_privileged(9) name in the Kernel API Manual. go be privileged (or not, depending on is_virtfn 💀) — mwah 🫶💜