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Re: [Xen-devel] [PATCH v1] x86/hvm: Generic instruction re-execution mechanism for execute faults
- To: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 27 Nov 2018 11:59:57 +0000
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- Cc: "kevin.tian@xxxxxxxxx" <kevin.tian@xxxxxxxxx>, "tamas@xxxxxxxxxxxxx" <tamas@xxxxxxxxxxxxx>, "wei.liu2@xxxxxxxxxx" <wei.liu2@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>, "george.dunlap@xxxxxxxxxxxxx" <george.dunlap@xxxxxxxxxxxxx>, Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>, Andrei Vlad LUTAS <vlutas@xxxxxxxxxxxxxxx>, "jun.nakajima@xxxxxxxxx" <jun.nakajima@xxxxxxxxx>, Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 27 Nov 2018 12:00:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 27/11/2018 11:45, Razvan Cojocaru wrote:
> On 11/27/18 1:32 PM, Roger Pau Monné wrote:
>> Would it be possible to add some kind of flag to the emulator to
>> signal whether p2m restrictions should be enforced/ignored?
>> hvmemul_acquire_page seems like a suitable place, but I'm not that
>> familiar with the emulator.
>>
>> Then you could generate vm events from the emulator itself, which
>> AFAICT is the only way to handle this instruction execution issue.
> I hope so, we'll definitely look into that.
FWIW, There is already a plan(tm). It was discussed at least in part in
Budapest.
The emulator needs to start honouring P2M permissions and generating
vm_events.
Then, a vm_event response can reply saying "please emulate the
instruction with this temporary change to the permissions", so
write-ability to a read-only page can be granted at the discretion of
the introspection agent.
That said, there is a huge amount of work required to make this happen,
and I haven't had time to do a clear design yet.
~Andrew
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