+ powerpc-kexec-enable-kexec_file_load-syscall.patch added to -mm tree

+ powerpc-kexec-enable-kexec_file_load-syscall.patch added to -mm tree

[akpm]

The patch titled
     Subject: powerpc/kexec: enable kexec_file_load() syscall
has been added to the -mm tree.  Its filename is
     powerpc-kexec-enable-kexec_file_load-syscall.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/powerpc-kexec-enable-kexec_file_load-syscall.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-kexec-enable-kexec_file_load-syscall.patch

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------------------------------------------------------
From: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Subject: powerpc/kexec: enable kexec_file_load() syscall

Define the Kconfig symbol so that the kexec_file_load() code can be
built, and wire up the syscall so that it can be called.

Link: http://lkml.kernel.org/r/1480423554-6411-8-git-send-email-mpe@ellerman.id.au
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Josh Sklar <sklar@linux.vnet.ibm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/powerpc/Kconfig                   |   13 +++++++++++++
 arch/powerpc/include/asm/systbl.h      |    1 +
 arch/powerpc/include/asm/unistd.h      |    2 +-
 arch/powerpc/include/uapi/asm/unistd.h |    1 +
 4 files changed, 16 insertions(+), 1 deletion(-)

diff -puN arch/powerpc/Kconfig~powerpc-kexec-enable-kexec_file_load-syscall arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig~powerpc-kexec-enable-kexec_file_load-syscall
+++ a/arch/powerpc/Kconfig
@@ -455,6 +455,19 @@ config KEXEC
 	  interface is strongly in flux, so no good recommendation can be
 	  made.
 
+config KEXEC_FILE
+	bool "kexec file based system call"
+	select KEXEC_CORE
+	select BUILD_BIN2C
+	depends on PPC64
+	depends on CRYPTO=y
+	depends on CRYPTO_SHA256=y
+	help
+	  This is a new version of the kexec system call. This call is
+	  file based and takes in file descriptors as system call arguments
+	  for kernel and initramfs as opposed to a list of segments as is the
+	  case for the older kexec call.
+
 config RELOCATABLE
 	bool "Build a relocatable kernel"
 	depends on (PPC64 && !COMPILE_TEST) || (FLATMEM && (44x || FSL_BOOKE))
diff -puN arch/powerpc/include/asm/systbl.h~powerpc-kexec-enable-kexec_file_load-syscall arch/powerpc/include/asm/systbl.h
--- a/arch/powerpc/include/asm/systbl.h~powerpc-kexec-enable-kexec_file_load-syscall
+++ a/arch/powerpc/include/asm/systbl.h
@@ -386,3 +386,4 @@ SYSCALL(mlock2)
 SYSCALL(copy_file_range)
 COMPAT_SYS_SPU(preadv2)
 COMPAT_SYS_SPU(pwritev2)
+SYSCALL(kexec_file_load)
diff -puN arch/powerpc/include/asm/unistd.h~powerpc-kexec-enable-kexec_file_load-syscall arch/powerpc/include/asm/unistd.h
--- a/arch/powerpc/include/asm/unistd.h~powerpc-kexec-enable-kexec_file_load-syscall
+++ a/arch/powerpc/include/asm/unistd.h
@@ -12,7 +12,7 @@
 #include <uapi/asm/unistd.h>
 
 
-#define NR_syscalls		382
+#define NR_syscalls		383
 
 #define __NR__exit __NR_exit
 
diff -puN arch/powerpc/include/uapi/asm/unistd.h~powerpc-kexec-enable-kexec_file_load-syscall arch/powerpc/include/uapi/asm/unistd.h
--- a/arch/powerpc/include/uapi/asm/unistd.h~powerpc-kexec-enable-kexec_file_load-syscall
+++ a/arch/powerpc/include/uapi/asm/unistd.h
@@ -392,5 +392,6 @@
 #define __NR_copy_file_range	379
 #define __NR_preadv2		380
 #define __NR_pwritev2		381
+#define __NR_kexec_file_load	382
 
 #endif /* _UAPI_ASM_POWERPC_UNISTD_H_ */
_

Patches currently in -mm which might be from bauerman@linux.vnet.ibm.com are

kexec_file-allow-arch-specific-memory-walking-for-kexec_add_buffer.patch
kexec_file-change-kexec_add_buffer-to-take-kexec_buf-as-argument.patch
kexec_file-factor-out-kexec_locate_mem_hole-from-kexec_add_buffer.patch
powerpc-change-places-using-config_kexec-to-use-config_kexec_core-instead.patch
powerpc-add-support-code-for-kexec_file_load.patch
powerpc-add-purgatory-for-kexec_file_load-implementation.patch
powerpc-kexec-enable-kexec_file_load-syscall.patch
powerpc-enable-config_kexec_file-in-powerpc-server-defconfigs.patch
powerpc-ima-get-the-kexec-buffer-passed-by-the-previous-kernel.patch
powerpc-ima-send-the-kexec-buffer-to-the-next-kernel.patch