linux-kernel - RE: [PATCH v3 0/4] X86/KVM: enable Intel MPX for KVM

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Message-ID: <DE8DF0795D48FD4CA783C40EC8292335014F733B@SHSMSX101.ccr.corp.intel.com>
Date:	Tue, 18 Feb 2014 09:32:00 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	"gleb@...hat.com" <gleb@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"Ren, Qiaowei" <qiaowei.ren@...el.com>
Subject: RE: [PATCH v3 0/4] X86/KVM: enable Intel MPX for KVM

Paolo Bonzini wrote:
> Il 22/01/2014 13:03, Paolo Bonzini ha scritto:
>> Il 22/01/2014 06:29, Liu, Jinsong ha scritto:
>>> These patches are version 3 to enalbe Intel MPX for KVM.
>>> 
>>> Version 1:
>>>   * Add some Intel MPX definiation
>>>   * Fix a cpuid(0x0d, 0) exposing bug, dynamic per XCR0 features
>>> enable/disable 
>>>   * vmx and msr handle for MPX support at KVM
>>>   * enalbe MPX feature for guest
>>> 
>>> Version 2:
>>>   * remove generic MPX definiation, Qiaowei's patch has add the
>>> definiation at kernel side 
>>>   * add MSR_IA32_BNDCFGS to msrs_to_save
>>> 
>>> Version 3:
>>>   * rebase on latest kernel, which include Qiaowei's MPX common
>>> definiation pulled from HPA's tree
>> 
>> I am afraid there is still some work to do on these patches, so they
>> need to be delayed to 3.15. 
>> 
>> Patch 1:
>>     this seems mostly separate from the rest of the MPX work.  I
>>     commented on the missing "ULL" suffix, but I would also like to
>>     understand why you put this patch in this series.
>> 
>> Patch 2:
>>     As remarked in the reply to this patch:
>>     - the vmx_disable_intercept_for_msr has to be unconditional
>>     - you need a new kvm_x86_ops member mpx_supported, to disable
>>     MPX whenever the two VMX controls are not available.
>> 
>> Patch 3:
>>     this patch needs to be rebased.  Apart from that it is fine,
>>     but please move the VMX bits together with patch 2, and the
>>     other bits together with patch 4.
>> 
>> Patch 4:
>>     this patch needs to be rebased and to use the new mpx_supported 
>> member 
>> 
>> If you also want to look at nested VMX support for MPX, that would be
>> nice.  It should not be hard.  Otherwise we can take care of that
>> later. 
>> 
>> Thanks for your work,
>> 
>> Paolo
> 
> Are you going to send v4?
> 
> Paolo

Yes, I just return from long Chinese Spring Festival, I will send V4 later.

Thanks,
Jinsong--
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