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authorLinus Torvalds <torvalds@linux-foundation.org>2020-05-30 12:28:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-05-30 12:28:44 -0700
commitffeb595d84811dde16a28b33d8a7cf26d51d51b3 (patch)
tree4ec3e3ad9a635a1e72dea4fc1f1b2f497fa9d3fc
parent900db15047044ef50b32e23630880f4780ec5b9e (diff)
parent2f26ed1764b42a8c40d9c48441c73a70d805decf (diff)
downloadlinux-ffeb595d84811dde16a28b33d8a7cf26d51d51b3.tar.bz2
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
-rw-r--r--arch/powerpc/kernel/Makefile3
-rw-r--r--arch/powerpc/kernel/exceptions-64s.S2
2 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 1c4385852d3d..244542ae2a91 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -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
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index b0ad930cbae5..ebeebab74b56 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -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