On 04/09/2019 12:45, Masami Hiramatsu wrote: > Hi, > > These patches allow x86 instruction decoder to decode > xen-cpuid which has XEN_EMULATE_PREFIX, and prohibit > kprobes to probe on it. > > Josh reported that the objtool can not decode such special > prefixed instructions, and I found that we also have to > prohibit kprobes to probe on such instruction. > > This series can be applied on -tip master branch which > has merged Josh's objtool/perf sharing common x86 insn > decoder series.
The paravirtualised xen-cpuid is were you'll see it most in a regular kernel, but be aware that it is also used for testing purposes in other circumstances, and there is an equivalent KVM prefix which is used for KVM testing. It might be better to generalise the decode support to "virtualisation escape prefix" or something slightly more generic. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
