From: Corneliu ZUZU <czuzu@bitdefender.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Kevin Tian <kevin.tian@intel.com>,
Tamas K Lengyel <tamas@tklengyel.com>,
Razvan Cojocaru <rcojocaru@bitdefender.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xen.org, Jun Nakajima <jun.nakajima@intel.com>
Subject: Re: [PATCH 4/7] vm-event/x86: use vm_event_vcpu_enter properly
Date: Fri, 17 Jun 2016 14:23:49 +0300 [thread overview]
Message-ID: <e1096714-ef9a-e4ff-cb1a-9cae02a18b50@bitdefender.com> (raw)
In-Reply-To: <5763C0CA02000078000F5E70@prv-mh.provo.novell.com>
On 6/17/2016 10:20 AM, Jan Beulich wrote:
>>>> On 16.06.16 at 22:20, <czuzu@bitdefender.com> wrote:
>> On 6/16/2016 6:00 PM, Jan Beulich wrote:
>>>>>> On 16.06.16 at 16:09, <czuzu@bitdefender.com> wrote:
>>>> @@ -1432,18 +1430,16 @@ static void vmx_update_guest_cr(struct vcpu *v, unsigned int cr)
>>>> if ( paging_mode_hap(v->domain) )
>>>> {
>>>> /* Manage GUEST_CR3 when CR0.PE=0. */
>>>> + uint32_t old_ctls = v->arch.hvm_vmx.exec_control;
>>>> uint32_t cr3_ctls = (CPU_BASED_CR3_LOAD_EXITING |
>>>> CPU_BASED_CR3_STORE_EXITING);
>>>> +
>>>> v->arch.hvm_vmx.exec_control &= ~cr3_ctls;
>>>> if ( !hvm_paging_enabled(v) && !vmx_unrestricted_guest(v) )
>>>> v->arch.hvm_vmx.exec_control |= cr3_ctls;
>>>>
>>>> - /* Trap CR3 updates if CR3 memory events are enabled. */
>>>> - if ( v->domain->arch.monitor.write_ctrlreg_enabled &
>>>> - monitor_ctrlreg_bitmask(VM_EVENT_X86_CR3) )
>>>> - v->arch.hvm_vmx.exec_control |= CPU_BASED_CR3_LOAD_EXITING;
>>>> -
>>>> - vmx_update_cpu_exec_control(v);
>>>> + if ( old_ctls != v->arch.hvm_vmx.exec_control )
>>>> + vmx_update_cpu_exec_control(v);
>>>> }
>>> How does this match up with the rest of this patch?
>> And by 'this' you mean slightly optimizing this sequence by adding in
>> old_ctls?
>> It seems pretty straight-forward to me, I figured if I am to move the
>> monitor.write_ctrlreg_enabled part from here
>> it wouldn't be much of a stretch to also do this little
>> optimization...what would have been appropriate?
>> To do this in a separate patch? To mention it in the commit message?
> At least the latter, and perhaps better the former. Without even
> mentioning it the readers (reviewers) have to guess whether this
> is an integral part of the change, or - as you now confirm - just a
> minor optimization done along the road.
>
> Jan
Ack, will split in separate patch in v2.
You're right, I've got to be more attentive to always separate unrelated
code changes, however minor they are :)
Thanks,
Corneliu.
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next prev parent reply other threads:[~2016-06-17 11:23 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
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 [this message]
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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