Merge branch 'topic/ppc-kvm' into next (9044adca) · Commits · 戴 / test

Documentation/powerpc/elfnote.rst

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		==========================
		ELF Note PowerPC Namespace
		==========================

		The PowerPC namespace in an ELF Note of the kernel binary is used to store
		capabilities and information which can be used by a bootloader or userland.

		Types and Descriptors
		---------------------

		The types to be used with the "PowerPC" namesapce are defined in the
		include/uapi/asm/elfnote.h

		1) PPC_ELFNOTE_CAPABILITIES

		Define the capabilities supported/required by the kernel. This type uses a
		bitmap as "descriptor" field. Each bit is described below:

		- Ultravisor-capable bit (PowerNV only).

		#define PPCCAP_ULTRAVISOR_BIT (1 << 0)

		Indicate that the powerpc kernel binary knows how to run in an
		ultravisor-enabled system.

		In an ultravisor-enabled system, some machine resources are now controlled
		by the ultravisor. If the kernel is not ultravisor-capable, but it ends up
		being run on a machine with ultravisor, the kernel will probably crash
		trying to access ultravisor resources. For instance, it may crash in early
		boot trying to set the partition table entry 0.

		In an ultravisor-enabled system, a bootloader could warn the user or prevent
		the kernel from being run if the PowerPC ultravisor capability doesn't exist
		or the Ultravisor-capable bit is not set.

		References
		----------

		arch/powerpc/include/asm/elfnote.h
		arch/powerpc/kernel/note.S

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		@@ -15,6 +15,7 @@
		#include <asm/epapr_hcalls.h>
		#include <asm/dcr.h>
		#include <asm/mmu_context.h>
		#include <asm/ultravisor-api.h>

		#include <uapi/asm/ucontext.h>

		@@ -34,6 +35,16 @@ extern struct static_key hcall_tracepoint_key;
		void __trace_hcall_entry(unsigned long opcode, unsigned long *args);
		void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf);

		/* Ultravisor */
		#ifdef CONFIG_PPC_POWERNV
		long ucall_norets(unsigned long opcode, ...);
		#else
		static inline long ucall_norets(unsigned long opcode, ...)
		{
		return U_NOT_AVAILABLE;
		}
		#endif

		/* OPAL */
		int64_t __opal_call(int64_t a0, int64_t a1, int64_t a2, int64_t a3,
		int64_t a4, int64_t a5, int64_t a6, int64_t a7,

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		/* SPDX-License-Identifier: GPL-2.0 */
		/*
		* PowerPC ELF notes.
		*
		* Copyright 2019, IBM Corporation
		*/

		#ifndef __ASM_POWERPC_ELFNOTE_H__
		#define __ASM_POWERPC_ELFNOTE_H__

		/*
		* These note types should live in a SHT_NOTE segment and have
		* "PowerPC" in the name field.
		*/

		/*
		* The capabilities supported/required by this kernel (bitmap).
		*
		* This type uses a bitmap as "desc" field. Each bit is described
		* in arch/powerpc/kernel/note.S
		*/
		#define PPC_ELFNOTE_CAPABILITIES 1

		#endif /* __ASM_POWERPC_ELFNOTE_H__ */

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		@@ -50,6 +50,7 @@
		#define FW_FEATURE_DRC_INFO ASM_CONST(0x0000000800000000)
		#define FW_FEATURE_BLOCK_REMOVE ASM_CONST(0x0000001000000000)
		#define FW_FEATURE_PAPR_SCM ASM_CONST(0x0000002000000000)
		#define FW_FEATURE_ULTRAVISOR ASM_CONST(0x0000004000000000)

		#ifndef __ASSEMBLY__

		@@ -68,9 +69,9 @@ enum {
		FW_FEATURE_TYPE1_AFFINITY \| FW_FEATURE_PRRN \|
		FW_FEATURE_HPT_RESIZE \| FW_FEATURE_DRMEM_V2 \|
		FW_FEATURE_DRC_INFO \| FW_FEATURE_BLOCK_REMOVE \|
		FW_FEATURE_PAPR_SCM,
		FW_FEATURE_PAPR_SCM \| FW_FEATURE_ULTRAVISOR,
		FW_FEATURE_PSERIES_ALWAYS = 0,
		FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
		FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL \| FW_FEATURE_ULTRAVISOR,
		FW_FEATURE_POWERNV_ALWAYS = 0,
		FW_FEATURE_PS3_POSSIBLE = FW_FEATURE_LPAR \| FW_FEATURE_PS3_LV1,
		FW_FEATURE_PS3_ALWAYS = FW_FEATURE_LPAR \| FW_FEATURE_PS3_LV1,