Peter Zijlstra df748593c5 x86: Add magic AMD return-thunk ... commit a149180fbc upstream. Note: needs to be in a section distinct from Retpolines such that the Retpoline RET substitution cannot possibly use immediate jumps. ORC unwinding for zen_untrain_ret() and __x86_return_thunk() is a little tricky but works due to the fact that zen_untrain_ret() doesn't have any stack ops and as such will emit a single ORC entry at the start (+0x3f). Meanwhile, unwinding an IP, including the __x86_return_thunk() one (+0x40) will search for the largest ORC entry smaller or equal to the IP, these will find the one ORC entry (+0x3f) and all works. [ Alexandre: SVM part. ] [ bp: Build fix, massages. ] Suggested-by: Andrew Cooper <Andrew.Cooper3@citrix.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de> [cascardo: conflicts at arch/x86/entry/entry_64_compat.S] [cascardo: there is no ANNOTATE_NOENDBR] [cascardo: objtool commit 34c861e806 missing] [cascardo: conflict fixup] Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> [bwh: Backported to 5.10: SEV-ES is not supported, so drop the change in arch/x86/kvm/svm/vmenter.S] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-07-25 11:26:40 +02:00
..
accounting
arch	tools arch: Update arch/x86/lib/mem{cpy,set}_64.S copies used in 'perf bench mem memcpy'	2022-07-25 11:26:31 +02:00
bootconfig	tools/bootconfig: Fix tracing_on option checking in ftrace2bconf.sh	2021-09-26 14:08:59 +02:00
bpf	tools/resolve_btfids: Do not print any commands when building silently	2022-02-08 18:30:39 +01:00
build	tools build: Use $(shell ) instead of `` to get embedded libperl's ccopts	2022-04-13 21:01:10 +02:00
cgroup
debugging
edid
firewire
firmware
gpio
hv
iio
include	x86/insn: Add an insn_decode() API	2022-07-25 11:26:11 +02:00
io_uring
kvm/kvm_stat
laptop
leds
lib	libbpf: Fix logic for finding matching program for CO-RE relocation	2022-06-09 10:21:03 +02:00
memory-model
objtool	x86: Add magic AMD return-thunk	2022-07-25 11:26:40 +02:00
pci
pcmcia
perf	x86/insn: Add a __ignore_sync_check__ marker	2022-07-25 11:26:11 +02:00
power	tools/power turbostat: fix ICX DRAM power numbers	2022-06-09 10:20:51 +02:00
scripts	tools: Allow proper CC/CXX/... override with LLVM=1 in Makefile.include	2021-07-31 08:16:10 +02:00
spi
testing	selftests: forwarding: fix error message in learning_test	2022-07-12 16:32:22 +02:00
thermal/tmon	tools/thermal/tmon: Add cross compiling support	2021-09-18 13:40:07 +02:00
time
usb	usb: testusb: Fix for showing the connection speed	2021-10-09 14:40:56 +02:00
virtio	tools/virtio: compile with -pthread	2022-05-25 09:17:53 +02:00
vm	tools/vm/page-types: remove dependency on opt_file for idle page tracking	2021-10-09 14:40:57 +02:00
wmi
Makefile