| Message ID | 20220512135654.119791-1-mheyne@amazon.de (mailing list archive) |
|---|---|
| Headers | show |
| Series | x86: decode Xen/KVM emulate prefixes | expand |
On Thu, May 12, 2022 at 01:56:47PM +0000, Maximilian Heyne wrote: > This is a backport of a patch series for 5.4.x. > > The patch series allows the x86 decoder to decode the Xen and KVM emulate > prefixes. > > In particular this solves the following issue that appeared when commit > db6c6a0df840 ("objtool: Fix noreturn detection for ignored functions") was > backported to 5.4.69: > > arch/x86/xen/enlighten_pv.o: warning: objtool: xen_cpuid()+0x25: can't find jump dest instruction at .text+0x9c > > Also now that this decoding is possible, also backport the commit which prevents > kprobes on probing such prefixed instructions. This was also part of the > original series. > > The series applied mostly cleanly on 5.4.192 except for a contextual problem in > the 3rd patch ("x86: xen: insn: Decode Xen and KVM emulate-prefix signature"). > > Masami Hiramatsu (4): > x86/asm: Allow to pass macros to __ASM_FORM() > x86: xen: kvm: Gather the definition of emulate prefixes > x86: xen: insn: Decode Xen and KVM emulate-prefix signature > x86: kprobes: Prohibit probing on instruction which has emulate prefix > > arch/x86/include/asm/asm.h | 8 +++-- > arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ > arch/x86/include/asm/insn.h | 6 ++++ > arch/x86/include/asm/xen/interface.h | 11 +++---- > arch/x86/kernel/kprobes/core.c | 4 +++ > arch/x86/kvm/x86.c | 4 ++- > arch/x86/lib/insn.c | 34 +++++++++++++++++++++ > tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ > tools/arch/x86/include/asm/insn.h | 6 ++++ > tools/arch/x86/lib/insn.c | 34 +++++++++++++++++++++ > tools/objtool/sync-check.sh | 3 +- > tools/perf/check-headers.sh | 3 +- > 12 files changed, 128 insertions(+), 13 deletions(-) > create mode 100644 arch/x86/include/asm/emulate_prefix.h > create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h > > > base-commit: 1d72b776f6dc973211f5d153453cf8955fb3d70a > -- > 2.32.0 > > > > > Amazon Development Center Germany GmbH > Krausenstr. 38 > 10117 Berlin > Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss > Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B > Sitz: Berlin > Ust-ID: DE 289 237 879 > > > All now queued up, thanks. greg k-h
This is a backport of a patch series for 5.4.x. The patch series allows the x86 decoder to decode the Xen and KVM emulate prefixes. In particular this solves the following issue that appeared when commit db6c6a0df840 ("objtool: Fix noreturn detection for ignored functions") was backported to 5.4.69: arch/x86/xen/enlighten_pv.o: warning: objtool: xen_cpuid()+0x25: can't find jump dest instruction at .text+0x9c Also now that this decoding is possible, also backport the commit which prevents kprobes on probing such prefixed instructions. This was also part of the original series. The series applied mostly cleanly on 5.4.192 except for a contextual problem in the 3rd patch ("x86: xen: insn: Decode Xen and KVM emulate-prefix signature"). Masami Hiramatsu (4): x86/asm: Allow to pass macros to __ASM_FORM() x86: xen: kvm: Gather the definition of emulate prefixes x86: xen: insn: Decode Xen and KVM emulate-prefix signature x86: kprobes: Prohibit probing on instruction which has emulate prefix arch/x86/include/asm/asm.h | 8 +++-- arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ arch/x86/include/asm/insn.h | 6 ++++ arch/x86/include/asm/xen/interface.h | 11 +++---- arch/x86/kernel/kprobes/core.c | 4 +++ arch/x86/kvm/x86.c | 4 ++- arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ tools/arch/x86/include/asm/insn.h | 6 ++++ tools/arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/objtool/sync-check.sh | 3 +- tools/perf/check-headers.sh | 3 +- 12 files changed, 128 insertions(+), 13 deletions(-) create mode 100644 arch/x86/include/asm/emulate_prefix.h create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h base-commit: 1d72b776f6dc973211f5d153453cf8955fb3d70a