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Re: [Xen-devel] [PATCH] x86/debug: Plumb pending_dbg through the monitor and devicemodel interfaces
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 3 Dec 2019 18:09:25 +0000
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- Cc: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 03 Dec 2019 18:09:55 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 03/12/2019 18:05, Tamas K Lengyel wrote:
>> diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h
>> index 959083d8c4..76676ff4c0 100644
>> --- a/xen/include/public/vm_event.h
>> +++ b/xen/include/public/vm_event.h
>> @@ -281,6 +281,7 @@ struct vm_event_debug {
>> uint32_t insn_length;
>> uint8_t type; /* HVMOP_TRAP_* */
>> uint8_t _pad[3];
>> + uint64_t pending_dbg;
> This is just a nitpick but I would prefer if we had the _pad field as
> the last element in the struct and keep all 64-bit members up in the
> front.
Well the reason I did it like this is that this version will continue to
function with older introspection code. The extra field is within a
union and no other data moves.
By repositioning to the start, it will almost certainly break older
introspection code even though it compiled correctly.
Your choice.
~Andrew
P.S. What is the point of tail-padding a struct inside a union?
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