From: Razvan Cojocaru <rcojocaru@bitdefender.com>
To: Corneliu ZUZU <czuzu@bitdefender.com>, Jan Beulich <JBeulich@suse.com>
Cc: Kevin Tian <kevin.tian@intel.com>,
Stefano Stabellini <sstabellini@kernel.org>,
George Dunlap <george.dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xen.org, Julien Grall <julien.grall@arm.com>,
Paul Durrant <paul.durrant@citrix.com>,
Tamas K Lengyel <tamas@tklengyel.com>,
Jun Nakajima <jun.nakajima@intel.com>
Subject: Re: [PATCH 3/7] vm-event: introduce vm_event_vcpu_enter
Date: Thu, 16 Jun 2016 23:33:24 +0300 [thread overview]
Message-ID: <e3d4eee6-93ca-ea9d-c96d-364a7f140255@bitdefender.com> (raw)
In-Reply-To: <d5b8e876-738e-994f-4e77-435e1daa9b1d@bitdefender.com>
On 06/16/16 23:10, Corneliu ZUZU wrote:
> On 6/16/2016 5:51 PM, Jan Beulich wrote:
>>>>> On 16.06.16 at 16:08, <czuzu@bitdefender.com> wrote:
>>> @@ -509,6 +508,8 @@ void hvm_do_resume(struct vcpu *v)
>>> }
>>> }
>>> + vm_event_vcpu_enter(v);
>> Why here?
> Why indeed. It made sense because monitor_write_data handling was
> originally there and then the plan was to move it to vm_event_vcpu_enter
> (which happens in the following commit).
> The question is though, why was monitor_write_data handled there in the
> first place? Why was it not put e.g. in vmx_do_resume immediately after
> the call to hvm_do_resume and just before
> the reset_stack_and_jump...? And what happens with handling
> monitor_write_data if this:
>
> if ( !handle_hvm_io_completion(v) )
> return;
>
> causes a return?
It's in hvm_do_resume() because, for one, that's the place that was
suggested (or at least confirmed when I've proposed it for such things)
on this list back when I wrote the code. And then it's here because
vmx_do_things()-type functions are, well, VMX, and I had hoped that by
choosing hvm-prefixed functions I'd get SVM support for free.
As for the handle_hvm_io_completion(v) return, my understanding was that
that would eventually cause another exit, and eventually we'd get to the
code below once the IO part is done.
Thanks,
Razvan
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next prev parent reply other threads:[~2016-06-16 20:33 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 14:04 [PATCH 0/7] vm-event: Implement ARM support for control-register writes Corneliu ZUZU
2016-06-16 14:06 ` [PATCH 1/7] minor (formatting) fixes Corneliu ZUZU
2016-06-16 14:24 ` Jan Beulich
2016-06-16 19:19 ` Corneliu ZUZU
2016-06-17 7:06 ` Jan Beulich
2016-06-17 10:46 ` Corneliu ZUZU
2016-06-16 16:02 ` Tamas K Lengyel
2016-06-17 8:33 ` Corneliu ZUZU
2016-06-17 8:36 ` Razvan Cojocaru
2016-06-17 9:29 ` Andrew Cooper
2016-06-17 9:35 ` Jan Beulich
2016-06-17 9:33 ` Jan Beulich
2016-06-17 9:36 ` Razvan Cojocaru
2016-06-17 9:40 ` Jan Beulich
2016-06-17 9:42 ` Razvan Cojocaru
2016-06-17 19:05 ` Tamas K Lengyel
2016-06-16 14:07 ` [PATCH 2/7] vm-event: VM_EVENT_FLAG_DENY requires VM_EVENT_FLAG_VCPU_PAUSED Corneliu ZUZU
2016-06-16 16:11 ` Tamas K Lengyel
2016-06-17 8:43 ` Corneliu ZUZU
2016-06-21 11:26 ` Corneliu ZUZU
2016-06-21 15:09 ` Tamas K Lengyel
2016-06-22 8:34 ` Corneliu ZUZU
2016-06-16 14:08 ` [PATCH 3/7] vm-event: introduce vm_event_vcpu_enter Corneliu ZUZU
2016-06-16 14:51 ` Jan Beulich
2016-06-16 20:10 ` Corneliu ZUZU
2016-06-16 20:33 ` Razvan Cojocaru [this message]
2016-06-17 10:41 ` Corneliu ZUZU
2016-06-17 7:17 ` Jan Beulich
2016-06-17 11:13 ` Corneliu ZUZU
2016-06-17 11:27 ` Jan Beulich
2016-06-17 12:13 ` Corneliu ZUZU
2016-06-16 16:17 ` Tamas K Lengyel
2016-06-17 9:19 ` Corneliu ZUZU
2016-06-17 8:55 ` Julien Grall
2016-06-17 11:40 ` Corneliu ZUZU
2016-06-17 13:22 ` Julien Grall
2016-06-16 14:09 ` [PATCH 4/7] vm-event/x86: use vm_event_vcpu_enter properly Corneliu ZUZU
2016-06-16 15:00 ` Jan Beulich
2016-06-16 20:20 ` Corneliu ZUZU
2016-06-17 7:20 ` Jan Beulich
2016-06-17 11:23 ` Corneliu ZUZU
2016-06-16 16:27 ` Tamas K Lengyel
2016-06-17 9:24 ` Corneliu ZUZU
2016-06-16 14:10 ` [PATCH 5/7] x86: replace monitor_write_data.do_write with enum Corneliu ZUZU
2016-06-16 14:12 ` [PATCH 6/7] vm-event/arm: move hvm_event_cr->common vm_event_monitor_cr Corneliu ZUZU
2016-06-16 15:16 ` Jan Beulich
2016-06-17 8:25 ` Corneliu ZUZU
2016-06-17 8:38 ` Jan Beulich
2016-06-17 11:31 ` Corneliu ZUZU
2016-06-21 7:08 ` Corneliu ZUZU
2016-06-21 7:20 ` Jan Beulich
2016-06-21 15:22 ` Tamas K Lengyel
2016-06-22 6:33 ` Jan Beulich
2016-06-16 16:55 ` Tamas K Lengyel
2016-06-17 10:37 ` Corneliu ZUZU
2016-06-16 14:13 ` [PATCH 7/7] vm-event/arm: implement support for control-register write vm-events Corneliu ZUZU
2016-06-16 14:26 ` Julien Grall
2016-06-16 19:24 ` Corneliu ZUZU
2016-06-16 21:28 ` Julien Grall
2016-06-17 11:46 ` Corneliu ZUZU
2016-06-16 16:49 ` Julien Grall
2016-06-17 10:36 ` Corneliu ZUZU
2016-06-17 13:18 ` Julien Grall
2016-06-22 16:35 ` Corneliu ZUZU
2016-06-22 17:17 ` Julien Grall
2016-06-22 18:39 ` Corneliu ZUZU
2016-06-22 19:37 ` Corneliu ZUZU
2016-06-22 19:41 ` Julien Grall
2016-06-23 5:31 ` Corneliu ZUZU
2016-06-23 5:49 ` Corneliu ZUZU
2016-06-23 11:11 ` Julien Grall
2016-06-24 9:32 ` Corneliu ZUZU
2016-06-23 11:00 ` Julien Grall
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