s390: add ELF note type for encrypted CPU state of a PV VCPU

The type NT_S390_PV_CPU_DATA note contains the encrypted CPU state of
a PV VCPU. It's only relevant in dumps of s390 PV VMs and can't be
decrypted without a second block of encrypted data which provides key
parts. Therefore we only reserve the note type here.

The zgetdump tool from the s390-tools package can, together with a
Customer Communication Key, be used to convert a PV VM dump into a
normal VM dump. zgetdump will decrypt the CPU data and overwrite the
other respective notes to make the data accessible for crash and other
debugging tools.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
[agordeev@linux.ibm.com changed desctiption]
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 2b9f5e9..c7b056a 100644 (file)
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -420,6 +420,7 @@ typedef struct elf64_shdr {
 #define NT_S390_GS_CB  0x30b           /* s390 guarded storage registers */
 #define NT_S390_GS_BC  0x30c           /* s390 guarded storage broadcast control block */
 #define NT_S390_RI_CB  0x30d           /* s390 runtime instrumentation */
+#define NT_S390_PV_CPU_DATA    0x30e   /* s390 protvirt cpu dump data */
 #define NT_ARM_VFP     0x400           /* ARM VFP/NEON registers */
 #define NT_ARM_TLS     0x401           /* ARM TLS register */
 #define NT_ARM_HW_BREAK        0x402           /* ARM hardware breakpoint registers */