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powerpc fixes for 5.7 #6

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A fix for the recent change to how we restore non-volatile GPRs, which broke our
 emulation of reading from the DSCR (Data Stream Control Register).
 
 And a fix for the recent rewrite of interrupt/syscall exit in C, we need to
 exclude KCOV from that code, otherwise it can lead to unrecoverable faults.
 
 Thanks to:
   Daniel Axtens.
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Merge tag 'powerpc-5.7-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - a fix for the recent change to how we restore non-volatile GPRs,
   which broke our emulation of reading from the DSCR (Data Stream
   Control Register).

 - a fix for the recent rewrite of interrupt/syscall exit in C, we need
   to exclude KCOV from that code, otherwise it can lead to
   unrecoverable faults.

Thanks to Daniel Axtens.

* tag 'powerpc-5.7-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s: Disable sanitisers for C syscall/interrupt entry/exit code
  powerpc/64s: Fix restore of NV GPRs after facility unavailable exception
This commit is contained in:
Linus Torvalds 2020-05-30 12:28:44 -07:00
commit ffeb595d84
2 changed files with 5 additions and 0 deletions
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3
arch/powerpc/kernel/Makefile
View File

@ -162,6 +162,9 @@ UBSAN_SANITIZE_kprobes.o := n
GCOV_PROFILE_kprobes-ftrace.o := n
KCOV_INSTRUMENT_kprobes-ftrace.o := n
UBSAN_SANITIZE_kprobes-ftrace.o := n
GCOV_PROFILE_syscall_64.o := n
KCOV_INSTRUMENT_syscall_64.o := n
UBSAN_SANITIZE_syscall_64.o := n
UBSAN_SANITIZE_vdso.o := n
# Necessary for booting with kcov enabled on book3e machines

2
arch/powerpc/kernel/exceptions-64s.S
View File

@ -2411,6 +2411,7 @@ EXC_COMMON_BEGIN(facility_unavailable_common)
GEN_COMMON facility_unavailable
addi r3,r1,STACK_FRAME_OVERHEAD
bl facility_unavailable_exception
REST_NVGPRS(r1) /* instruction emulation may change GPRs */
b interrupt_return
GEN_KVM facility_unavailable
@ -2440,6 +2441,7 @@ EXC_COMMON_BEGIN(h_facility_unavailable_common)
GEN_COMMON h_facility_unavailable
addi r3,r1,STACK_FRAME_OVERHEAD
bl facility_unavailable_exception
REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */
b interrupt_return
GEN_KVM h_facility_unavailable