coco/tdx/tdx.c

229 static int ve_instr_len(struct ve_info *ve)
231 	switch (ve->exit_reason) {
237 		/* It is safe to use ve->instr_len for #VE due instructions */
238 		return ve->instr_len;
241 		 * For EPT violations, ve->insn_len is not defined. For those,
245 		WARN_ONCE(1, "ve->instr_len is not defined for EPT violations");
248 		WARN_ONCE(1, "Unexpected #VE-type: %lld\n", ve->exit_reason);
249 		return ve->instr_len;
276 static int handle_halt(struct ve_info *ve)
283 	return ve_instr_len(ve);
297 static int read_msr(struct pt_regs *regs, struct ve_info *ve)
315 	return ve_instr_len(ve);
318 static int write_msr(struct pt_regs *regs, struct ve_info *ve)
335 	return ve_instr_len(ve);
338 static int handle_cpuid(struct pt_regs *regs, struct ve_info *ve)
356 		return ve_instr_len(ve);
377 	return ve_instr_len(ve);
404 static int handle_mmio(struct pt_regs *regs, struct ve_info *ve)
450 		if (!mmio_write(size, ve->gpa, val))
455 		if (!mmio_write(size, ve->gpa, val))
477 	if (!mmio_read(size, ve->gpa, &val))
557 static int handle_io(struct pt_regs *regs, struct ve_info *ve)
559 	u32 exit_qual = ve->exit_qual;
578 	return ve_instr_len(ve);
587 	struct ve_info ve;
590 	tdx_get_ve_info(&ve);
592 	if (ve.exit_reason != EXIT_REASON_IO_INSTRUCTION)
595 	insn_len = handle_io(regs, &ve);
603 void tdx_get_ve_info(struct ve_info *ve)
625 	ve->exit_reason = args.rcx;
626 	ve->exit_qual   = args.rdx;
627 	ve->gla         = args.r8;
628 	ve->gpa         = args.r9;
629 	ve->instr_len   = lower_32_bits(args.r10);
630 	ve->instr_info  = upper_32_bits(args.r10);
639 static int virt_exception_user(struct pt_regs *regs, struct ve_info *ve)
641 	switch (ve->exit_reason) {
643 		return handle_cpuid(regs, ve);
645 		pr_warn("Unexpected #VE: %lld\n", ve->exit_reason);
661 static int virt_exception_kernel(struct pt_regs *regs, struct ve_info *ve)
663 	switch (ve->exit_reason) {
665 		return handle_halt(ve);
667 		return read_msr(regs, ve);
669 		return write_msr(regs, ve);
671 		return handle_cpuid(regs, ve);
673 		if (is_private_gpa(ve->gpa))
675 		return handle_mmio(regs, ve);
677 		return handle_io(regs, ve);
679 		pr_warn("Unexpected #VE: %lld\n", ve->exit_reason);
684 bool tdx_handle_virt_exception(struct pt_regs *regs, struct ve_info *ve)
689 		insn_len = virt_exception_user(regs, ve);
691 		insn_len = virt_exception_kernel(regs, ve);