Hi Borislav,
On 17/05/18 14:36, Borislav Petkov wrote:
> On Wed, May 16, 2018 at 03:51:14PM +0100, James Morse wrote:
>> I thought this was safe because its just ghes_copy_tofrom_phys()s access to
>> the
>> fixmap slots that needs mutual exclusion.
and here is where I was wrong: I was only looki
On Wed, May 16, 2018 at 11:38:16AM -0400, Tyler Baicar wrote:
> I haven't seen a deadlock from that, but it looks possible. What if
> the ghes_proc() call in ghes_probe() is moved before the second switch
> statement? That way it is before the NMI/IRQ/poll is setup. At quick
> glance I think that s
On Wed, May 16, 2018 at 03:51:14PM +0100, James Morse wrote:
> The first two overload existing architectural behavior, the third improves all
> this with a third standard option. Its the standard story!
:-)
> I thought this was safe because its just ghes_copy_tofrom_phys()s access to
> the
> fix
On 5/16/2018 7:05 AM, Borislav Petkov wrote:
On Tue, May 08, 2018 at 09:45:01AM +0100, James Morse wrote:
Alternatively, I can put the fixmap-page and spinlock in some 'struct
ghes_notification' that only the NMI-like struct-ghes need. This is just moving
the indirection up a level, but it does
Hi Borislav,
On 16/05/18 12:05, Borislav Petkov wrote:
> On Tue, May 08, 2018 at 09:45:01AM +0100, James Morse wrote:
>> NOTIFY_NMI is x86's NMI, arm doesn't have anything that behaves in the same
>> way,
>> so doesn't use it. The equivalent notifications with NMI-like behaviour are:
>> * SEA (sy
On Tue, May 08, 2018 at 09:45:01AM +0100, James Morse wrote:
> NOTIFY_NMI is x86's NMI, arm doesn't have anything that behaves in the same
> way,
> so doesn't use it. The equivalent notifications with NMI-like behaviour are:
> * SEA (synchronous external abort)
> * SEI (SError Interrupt)
> * SDEI
Hi Borislav,
On 05/05/18 13:27, Borislav Petkov wrote:
> On Fri, Apr 27, 2018 at 04:35:05PM +0100, James Morse wrote:
>> Arm64 has multiple NMI-like notifications, but ghes.c only has one
>> in_nmi() path, risking deadlock if one NMI-like notification can
>> interrupt another.
>>
>> To support thi
On Fri, Apr 27, 2018 at 04:35:05PM +0100, James Morse wrote:
> Arm64 has multiple NMI-like notifications, but ghes.c only has one
> in_nmi() path, risking deadlock if one NMI-like notification can
> interrupt another.
>
> To support this we need a fixmap entry and lock for each notification
> type
