On 28/09/17 15:55, Josh Poimboeuf wrote:
> On Thu, Sep 28, 2017 at 08:03:26AM +0200, Juergen Gross wrote:
>> On 27/09/17 23:08, Josh Poimboeuf wrote:
>>> On Tue, Aug 08, 2017 at 01:09:08PM -0700, Andy Lutomirski wrote:
On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf
wrote:
> On Tue,
On Thu, Sep 28, 2017 at 08:03:26AM +0200, Juergen Gross wrote:
> On 27/09/17 23:08, Josh Poimboeuf wrote:
> > On Tue, Aug 08, 2017 at 01:09:08PM -0700, Andy Lutomirski wrote:
> >> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf
> >> wrote:
> >>> On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Tor
On 27/09/17 23:08, Josh Poimboeuf wrote:
> On Tue, Aug 08, 2017 at 01:09:08PM -0700, Andy Lutomirski wrote:
>> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
>>> On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf
wrot
On Tue, Aug 08, 2017 at 01:09:08PM -0700, Andy Lutomirski wrote:
> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
> > On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
> >> On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf
> >> wrote:
> >> >
> >> > Take for example the lock_i
On Thu, Aug 10, 2017 at 04:59:36PM +0200, Juergen Gross wrote:
> On 10/08/17 16:39, Josh Poimboeuf wrote:
> > On Thu, Aug 10, 2017 at 04:24:58PM +0200, Juergen Gross wrote:
> I'll send some patches to:
>
> - remove xen_patch()
> - remove lguest
> - remove vsmp
>
>
On 10/08/17 16:39, Josh Poimboeuf wrote:
> On Thu, Aug 10, 2017 at 04:24:58PM +0200, Juergen Gross wrote:
I'll send some patches to:
- remove xen_patch()
- remove lguest
- remove vsmp
In case nobody objects to apply those patches we can possibly simplify
some
On Thu, Aug 10, 2017 at 09:09:03AM -0500, Josh Poimboeuf wrote:
> static inline notrace unsigned long arch_local_save_flags(void)
> {
> return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl,
> "pushfq; popq %rax", CPU_FEATURE_NATIVE,
> "call
On Thu, Aug 10, 2017 at 04:24:58PM +0200, Juergen Gross wrote:
> >> I'll send some patches to:
> >>
> >> - remove xen_patch()
> >> - remove lguest
> >> - remove vsmp
> >>
> >> In case nobody objects to apply those patches we can possibly simplify
> >> some more code.
> >>
> >> I'd love that. :-)
>
On 10/08/17 16:09, Josh Poimboeuf wrote:
> On Thu, Aug 10, 2017 at 09:05:19AM +0200, Juergen Gross wrote:
>>> I'm wondering why xen_patch() even exists. The main difference between
>>> xen_patch() and native_patch() seems to be that xen_patch() does some
>>> relocs when doing an inline patch after
On Thu, Aug 10, 2017 at 09:05:19AM +0200, Juergen Gross wrote:
> > I'm wondering why xen_patch() even exists. The main difference between
> > xen_patch() and native_patch() seems to be that xen_patch() does some
> > relocs when doing an inline patch after calling paravirt_patch_insns().
> >
> > B
On 09/08/17 22:15, Josh Poimboeuf wrote:
> On Wed, Aug 09, 2017 at 11:55:35AM +0200, Juergen Gross wrote:
>> On 09/08/17 11:35, Peter Zijlstra wrote:
>>> On Wed, Aug 09, 2017 at 11:24:07AM +0200, Juergen Gross wrote:
On 09/08/17 11:16, Peter Zijlstra wrote:
> On Wed, Aug 09, 2017 at 10:49:
On Wed, Aug 09, 2017 at 11:55:35AM +0200, Juergen Gross wrote:
> On 09/08/17 11:35, Peter Zijlstra wrote:
> > On Wed, Aug 09, 2017 at 11:24:07AM +0200, Juergen Gross wrote:
> >> On 09/08/17 11:16, Peter Zijlstra wrote:
> >>> On Wed, Aug 09, 2017 at 10:49:43AM +0200, Juergen Gross wrote:
> > ALT
On 09/08/17 18:11, Andy Lutomirski wrote:
> On Wed, Aug 9, 2017 at 1:49 AM, Juergen Gross wrote:
>> On 08/08/17 22:09, Andy Lutomirski wrote:
>>> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
> On Tue, Aug 8, 2017 a
On Wed, Aug 9, 2017 at 1:49 AM, Juergen Gross wrote:
> On 08/08/17 22:09, Andy Lutomirski wrote:
>> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
>>> On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf
wrote:
>
>
On 09/08/17 11:35, Peter Zijlstra wrote:
> On Wed, Aug 09, 2017 at 11:24:07AM +0200, Juergen Gross wrote:
>> On 09/08/17 11:16, Peter Zijlstra wrote:
>>> On Wed, Aug 09, 2017 at 10:49:43AM +0200, Juergen Gross wrote:
> ALTERNATIVE "pushfq; popq %rax", "callq *pv_irq_ops.save_fl",
> X86_FEAT
On Wed, Aug 09, 2017 at 11:24:07AM +0200, Juergen Gross wrote:
> On 09/08/17 11:16, Peter Zijlstra wrote:
> > On Wed, Aug 09, 2017 at 10:49:43AM +0200, Juergen Gross wrote:
> >>> ALTERNATIVE "pushfq; popq %rax", "callq *pv_irq_ops.save_fl",
> >>> X86_FEATURE_GODDAMN_PV_IRQ_OPS
> >>
> >> You are awa
On 09/08/17 11:16, Peter Zijlstra wrote:
> On Wed, Aug 09, 2017 at 10:49:43AM +0200, Juergen Gross wrote:
>>> ALTERNATIVE "pushfq; popq %rax", "callq *pv_irq_ops.save_fl",
>>> X86_FEATURE_GODDAMN_PV_IRQ_OPS
>>
>> You are aware that at least some of the Xen irq pvops functionality is
>> patched inli
On Wed, Aug 09, 2017 at 10:49:43AM +0200, Juergen Gross wrote:
> > ALTERNATIVE "pushfq; popq %rax", "callq *pv_irq_ops.save_fl",
> > X86_FEATURE_GODDAMN_PV_IRQ_OPS
>
> You are aware that at least some of the Xen irq pvops functionality is
> patched inline? Your modification would slow down pv gues
On 08/08/17 22:09, Andy Lutomirski wrote:
> On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
>> On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
>>> On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf wrote:
Take for example the lock_is_held_type() function. In vmlinux
On Tue, Aug 08, 2017 at 01:09:08PM -0700, Andy Lutomirski wrote:
> >> c) just add ORC data for the alternative statically and _unconditionally_.
> >>
> >> No runtime registration. Just an unconditional entry for the
> >> particular IP that comes after the "pushfq". It cannot match the
> >> "callq"
On Tue, Aug 8, 2017 at 12:13 PM, Josh Poimboeuf wrote:
> On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
>> On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf wrote:
>> >
>> > Take for example the lock_is_held_type() function. In vmlinux, it has
>> > the following instruction:
>> >
On Tue, Aug 08, 2017 at 12:03:51PM -0700, Linus Torvalds wrote:
> On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf wrote:
> >
> > Take for example the lock_is_held_type() function. In vmlinux, it has
> > the following instruction:
> >
> > callq *0x85a94880 (pv_irq_ops.save_fl)
> >
> > At
On Tue, Aug 8, 2017 at 11:58 AM, Josh Poimboeuf wrote:
>
> Take for example the lock_is_held_type() function. In vmlinux, it has
> the following instruction:
>
> callq *0x85a94880 (pv_irq_ops.save_fl)
>
> At runtime, that instruction is patched and replaced with a fast inline
> version
On Fri, Jul 28, 2017 at 10:54:37PM -0500, Josh Poimboeuf wrote:
> On Fri, Jul 28, 2017 at 07:59:12PM +, Levin, Alexander (Sasha Levin)
> wrote:
> > On Fri, Jul 28, 2017 at 01:57:20PM -0500, Josh Poimboeuf wrote:
> > >Thanks, that's much better. I'm relieved the unwinder didn't screw that
> >
On Fri, Jul 28, 2017 at 07:59:12PM +, Levin, Alexander (Sasha Levin) wrote:
> On Fri, Jul 28, 2017 at 01:57:20PM -0500, Josh Poimboeuf wrote:
> >Thanks, that's much better. I'm relieved the unwinder didn't screw that
> >up, at least.
> >
> >This looks like a tricky one. Is it easily recreatab
On Fri, Jul 28, 2017 at 01:57:20PM -0500, Josh Poimboeuf wrote:
>Thanks, that's much better. I'm relieved the unwinder didn't screw that
>up, at least.
>
>This looks like a tricky one. Is it easily recreatable?
Yeah, I just hit it again with slightly different initial calls:
[ 49.261152]
===
On Fri, Jul 28, 2017 at 06:29:57PM +, Levin, Alexander (Sasha Levin) wrote:
> On Fri, Jul 28, 2017 at 12:52:34PM -0500, Josh Poimboeuf wrote:
> >On Fri, Jul 28, 2017 at 04:48:47PM +, Levin, Alexander (Sasha Levin)
> >wrote:
> >> Hey Josh,
> >>
> >> Syzkaller seems to trigger the following:
On Fri, Jul 28, 2017 at 12:52:34PM -0500, Josh Poimboeuf wrote:
>On Fri, Jul 28, 2017 at 04:48:47PM +, Levin, Alexander (Sasha Levin) wrote:
>> Hey Josh,
>>
>> Syzkaller seems to trigger the following:
>>
>> ==
>> BUG: KASAN: stack
On Fri, Jul 28, 2017 at 04:48:47PM +, Levin, Alexander (Sasha Levin) wrote:
> Hey Josh,
>
> Syzkaller seems to trigger the following:
>
> ==
> BUG: KASAN: stack-out-of-bounds in __read_once_size
> include/linux/compiler.h:253 [i
On Mon, Jul 24, 2017 at 06:36:57PM -0500, Josh Poimboeuf wrote:
>Add a new ORC unwinder which is enabled by CONFIG_ORC_UNWINDER. It
>plugs into the existing x86 unwinder framework.
>
>It relies on objtool to generate the needed .orc_unwind and
>.orc_unwind_ip sections.
>
>For more details on why O
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