Andy Lutomirski writes:
> On Wed, May 20, 2020 at 12:17 PM Thomas Gleixner wrote:
>>
>> Andy Lutomirski writes:
>> > Andrew Cooper pointed out that there is too much magic in Xen for this
>> > to work. So never mind.
>>
>> :)
>>
>> But you made me stare more at that stuff and I came up with a w
Boris Ostrovsky writes:
> On 5/20/20 3:16 PM, Thomas Gleixner wrote:
>
>
>> +__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
>> +{
>> +struct pt_regs *old_regs;
>> +bool inhcall;
>> +
>> +idtentry_enter(regs);
>> +old_regs = set_irq_regs(regs);
>> +
>> +ru
On 5/20/20 3:16 PM, Thomas Gleixner wrote:
> +__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
> +{
> + struct pt_regs *old_regs;
> + bool inhcall;
> +
> + idtentry_enter(regs);
> + old_regs = set_irq_regs(regs);
> +
> + run_on_irqstack(__xen_pv_evtchn_do_u
On Wed, May 20, 2020 at 12:17 PM Thomas Gleixner wrote:
>
> Andy Lutomirski writes:
> > Andrew Cooper pointed out that there is too much magic in Xen for this
> > to work. So never mind.
>
> :)
>
> But you made me stare more at that stuff and I came up with a way
> simpler solution. See below.
Andy Lutomirski writes:
> Andrew Cooper pointed out that there is too much magic in Xen for this
> to work. So never mind.
:)
But you made me stare more at that stuff and I came up with a way
simpler solution. See below.
Thanks,
tglx
8<--
arch/x86/entry/common.c
On Wed, May 20, 2020 at 8:16 AM Andy Lutomirski wrote:
>
> On Wed, May 20, 2020 at 7:13 AM Thomas Gleixner wrote:
> >
> > Andy Lutomirski writes:
> > > On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner
> > > wrote:
> > >> Which brings you into the situation that you call schedule() from the
> >
On Wed, May 20, 2020 at 7:13 AM Thomas Gleixner wrote:
>
> Andy Lutomirski writes:
> > On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner wrote:
> >> Which brings you into the situation that you call schedule() from the
> >> point where we just moved it out. If we would go there we'd need to
> >>
Andy Lutomirski writes:
> On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner wrote:
>> Which brings you into the situation that you call schedule() from the
>> point where we just moved it out. If we would go there we'd need to
>> ensure that RCU is watching as well. idtentry_exit() might have it
>
On 20/05/2020 09:06, Jürgen Groß wrote:
> On 19.05.20 21:44, Andy Lutomirski wrote:
>> On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner
>> wrote:
>>>
>>> Andy Lutomirski writes:
B: Turn this thing around. Specifically, in the one and only case we
care about, we know pretty much exactly
On 19.05.20 21:44, Andy Lutomirski wrote:
On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner wrote:
Andy Lutomirski writes:
On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner wrote:
@@ -573,6 +578,16 @@ static __always_inline void __idtentry_exit(struct pt_regs
*regs)
On Tue, May 19, 2020 at 11:58 AM Thomas Gleixner wrote:
>
> Andy Lutomirski writes:
> > On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner wrote:
> >> @@ -573,6 +578,16 @@ static __always_inline void __idtentry_exit(struct
> >> pt_regs *regs)
> >> instrumentation_en
Andy Lutomirski writes:
> On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner wrote:
>> @@ -573,6 +578,16 @@ static __always_inline void __idtentry_exit(struct
>> pt_regs *regs)
>> instrumentation_end();
>> return;
>>
On Fri, May 15, 2020 at 5:10 PM Thomas Gleixner wrote:
>
>
> Convert the XEN/PV hypercall to IDTENTRY:
>
> - Emit the ASM stub with DECLARE_IDTENTRY
> - Remove the ASM idtentry in 64bit
> - Remove the open coded ASM entry code in 32bit
> - Remove the old prototypes
>
> The handler stubs ne
Convert the XEN/PV hypercall to IDTENTRY:
- Emit the ASM stub with DECLARE_IDTENTRY
- Remove the ASM idtentry in 64bit
- Remove the open coded ASM entry code in 32bit
- Remove the old prototypes
The handler stubs need to stay in ASM code as it needs corner case handling
and adjustment o
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