On Thu, 5 Sep 2019 14:31:56 +0100
Andrew Cooper wrote:
> >>> The KVM version was added in c/s 6c86eedc206dd1f9d37a2796faa8e6f2278215d2
> > Hmm, I think I might misunderstand what the "emulate prefix"... that is not
> > a prefix which replace actual prefix, but just works like an escape
> >
On 05/09/2019 14:09, Masami Hiramatsu wrote:
> On Thu, 5 Sep 2019 20:32:24 +0900
> Masami Hiramatsu wrote:
>
>> On Thu, 5 Sep 2019 08:54:17 +0100
>> Andrew Cooper wrote:
>>
>>> On 05/09/2019 02:49, Masami Hiramatsu wrote:
On Wed, 4 Sep 2019 12:54:55 +0100
Andrew Cooper wrote:
On Thu, 5 Sep 2019 20:32:24 +0900
Masami Hiramatsu wrote:
> On Thu, 5 Sep 2019 08:54:17 +0100
> Andrew Cooper wrote:
>
> > On 05/09/2019 02:49, Masami Hiramatsu wrote:
> > > On Wed, 4 Sep 2019 12:54:55 +0100
> > > Andrew Cooper wrote:
> > >
> > >> On 04/09/2019 12:45, Masami Hiramatsu wrote:
On Thu, 5 Sep 2019 09:53:32 +0100
Andrew Cooper wrote:
> On 05/09/2019 09:26, Peter Zijlstra wrote:
> > On Thu, Sep 05, 2019 at 08:54:17AM +0100, Andrew Cooper wrote:
> >
> >> I don't know if you've spotted, but the prefix is a ud2a instruction
> >> followed by 'xen' in ascii.
> >>
> >> The KVM
On Thu, 5 Sep 2019 08:54:17 +0100
Andrew Cooper wrote:
> On 05/09/2019 02:49, Masami Hiramatsu wrote:
> > On Wed, 4 Sep 2019 12:54:55 +0100
> > Andrew Cooper wrote:
> >
> >> On 04/09/2019 12:45, Masami Hiramatsu wrote:
> >>> Hi,
> >>>
> >>> These patches allow x86 instruction decoder to decode
On 05/09/2019 10:26, Peter Zijlstra wrote:
> On Thu, Sep 05, 2019 at 09:53:32AM +0100, Andrew Cooper wrote:
>> On 05/09/2019 09:26, Peter Zijlstra wrote:
>>> On Thu, Sep 05, 2019 at 08:54:17AM +0100, Andrew Cooper wrote:
>>>
I don't know if you've spotted, but the prefix is a ud2a instruction
On Thu, Sep 05, 2019 at 09:53:32AM +0100, Andrew Cooper wrote:
> On 05/09/2019 09:26, Peter Zijlstra wrote:
> > On Thu, Sep 05, 2019 at 08:54:17AM +0100, Andrew Cooper wrote:
> >
> >> I don't know if you've spotted, but the prefix is a ud2a instruction
> >> followed by 'xen' in ascii.
> >>
> >>
On 05/09/2019 09:26, Peter Zijlstra wrote:
> On Thu, Sep 05, 2019 at 08:54:17AM +0100, Andrew Cooper wrote:
>
>> I don't know if you've spotted, but the prefix is a ud2a instruction
>> followed by 'xen' in ascii.
>>
>> The KVM version was added in c/s 6c86eedc206dd1f9d37a2796faa8e6f2278215d2
>
On Thu, Sep 05, 2019 at 08:54:17AM +0100, Andrew Cooper wrote:
> I don't know if you've spotted, but the prefix is a ud2a instruction
> followed by 'xen' in ascii.
>
> The KVM version was added in c/s 6c86eedc206dd1f9d37a2796faa8e6f2278215d2
While the Xen one disassebles to valid instructions,
On 05/09/2019 02:49, Masami Hiramatsu wrote:
> On Wed, 4 Sep 2019 12:54:55 +0100
> Andrew Cooper wrote:
>
>> 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
On Wed, 4 Sep 2019 12:54:55 +0100
Andrew Cooper wrote:
> 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
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
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