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Re: [Xen-devel] [PATCH v10] x86/emulate: Send vm_event from emulate
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>
- Date: Tue, 17 Sep 2019 15:39:12 +0000
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- Delivery-date: Tue, 17 Sep 2019 15:39:31 +0000
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- Thread-topic: [Xen-devel] [PATCH v10] x86/emulate: Send vm_event from emulate
On 17.09.2019 18:04, Jan Beulich wrote:
> On 17.09.2019 17:00, Alexandru Stefan ISAILA wrote:
>> There is no problem, I understand the risk of having suspicious return
>> values. I am not hanged on having this return. I used this to skip
>> adding a new return value. I can do this if we agree on a suitable name
>> for a new return value in enum hvm_translation_result. I can propose
>> HVMTRANS_bad_gfn_access.
>
> How intrusive would such a change be?
>
Only the return for hvm_copy_to_guest_linear() and
hvm_copy_from_guest_linear() will be affected.
There are 2 places to add checks, in linear_write() and linear_read().
The new return value can turn up only in hvm_emulate_one_vm_event()
context, when vm_event->send_event flag is true.
Alex
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