__kvmppc_gse_put_reg(9)

💖 __kvmppc_gse_put_reg — the kernel API manual page, but make it make sense 💖

okay so bestie, this is a page from the Kernel API Manual (section 9, kernel internals, iykyk) and honestly it's a whole vibe: it's about dropping a register-type guest state element into a buffer. tiny function, big lore. let's get into it 🫶

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✨ NAME ✨

__kvmppc_gse_put_reg — add a register type guest state element to a buffer

like, literally that. it puts a reg. into a buffer. slay.

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🌸 SYNOPSIS 🌸

int __kvmppc_gse_put_reg (struct kvmppc_gs_buff *gsb , u16 iden , u64 val );

returns an int, takes three things, that's the whole deal 💅

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🎀 ARGUMENTS 🎀

• gsb — the guest state buffer you're adding the element to. it's the destination, the main character, the place where things go.
• iden — the guest state ID. this little guy is doing a LOT of work (see below 👀).
• val — the value, in host endian. not guest endian, HOST endian. don't get it twisted 🙈

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🦋 DESCRIPTION 🦋

so it adds a register type guest state element. that's the job. one element, register-flavored, into the buffer.

here's the cute part: it uses the guest state ID to figure out the length of the guest element. so iden isn't just a name tag, it's lowkey the blueprint for how big the thing is going to be.

and if that guest state ID has bits that can not be set, they get cleared. no error, no drama, no warning — they're just quietly zeroed out. so keep that in mind bestie, don't be surprised when you peek at your bits later and they're not the bits you sent 💀

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🔥 SEE ALSO 🔥

this is the part where the page just... lists literally everyone. the whole extended universe. and we are NOT skipping any of them, because every single one of these is invited to the group chat:

Kernel file ./arch/powerpc/include/asm/guest-state-buffer.h

struct kvmppc_gs_part_table(9), struct kvmppc_gs_proc_table(9), struct kvmppc_gs_buff_info(9), struct kvmppc_gs_header(9), struct kvmppc_gs_elem(9), struct kvmppc_gs_buff(9), struct kvmppc_gs_bitmap(9), struct kvmppc_gs_parser(9), struct kvmppc_gs_msg_ops(9), struct kvmppc_gs_msg(9), kvmppc_gsb_header(9), kvmppc_gsb_data(9), kvmppc_gsb_len(9), kvmppc_gsb_capacity(9), kvmppc_gsb_paddress(9), kvmppc_gsb_nelems(9), kvmppc_gsb_reset(9), kvmppc_gsb_data_len(9), kvmppc_gsb_data_cap(9), kvmppc_gsb_for_each_elem(9), kvmppc_gse_iden(9), kvmppc_gse_len(9), kvmppc_gse_total_len(9), kvmppc_gse_total_size(9), kvmppc_gse_data(9), kvmppc_gse_ok(9), kvmppc_gse_next(9), kvmppc_gse_for_each_elem(9), kvmppc_gse_put_be32(9), kvmppc_gse_put_u32(9), kvmppc_gse_put_be64(9), kvmppc_gse_put_u64(9), kvmppc_gse_put_vector128(9), kvmppc_gse_put_part_table(9), kvmppc_gse_put_proc_table(9), kvmppc_gse_put_buff_info(9), kvmppc_gse_get_be32(9), kvmppc_gse_get_u32(9), kvmppc_gse_get_be64(9), kvmppc_gse_get_u64(9), kvmppc_gse_get_vector128(9), kvmppc_gsbm_zero(9), kvmppc_gsbm_fill(9), kvmppc_gsbm_for_each(9), kvmppc_gsp_for_each(9), kvmppc_gsm_for_each(9), kvmppc_gsm_include(9), kvmppc_gsm_includes(9), kvmppc_gsb_receive_data(9), kvmppc_gsb_send_data(9)

iconic. no notes. periodt.

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🌈 THE SIGN-OFF 🌈

this little gem lives in ./arch/powerpc/include/asm, it's tagged October 2026, and it answers to the name __kvmppc_gse_put_reg(9) — that's the whole footer, and yes I said what I said. go forth, put your registers, clear your unsettable bits, and stan powerpc 💜🦋✨