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From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>,
	gleb@kernel.org, mtosatti@redhat.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 09/10] KVM: MMU: fix MTRR update
Date: Thu, 14 May 2015 08:16:49 +0800	[thread overview]
Message-ID: <20150514001648.GA5206@kernel> (raw)
In-Reply-To: <55535B40.2060504@redhat.com>

On Wed, May 13, 2015 at 04:10:08PM +0200, Paolo Bonzini wrote:
>
>
>On 13/05/2015 10:43, Wanpeng Li wrote:
>> kvm_mmu_reset_context
>>   kvm_mmu_unload
>>     mmu_free_roots
>> 
>> The original root shadow page will be freed in mmu_free_roots, where I
>> miss?
>> 
>> Another question maybe not related to this patch:
>> 
>> If kvm_mmu_reset_context is just called to destroy the original root 
>> shadow page and all the sptes will remain valid? 
>
>SPTEs are kept around and cached.  The "role" field is used as the hash
>key; if the role doesn't change, SPTEs are reused, so you have to zap
>the SPTEs explicitly.

Thanks for your explanation. :)

Btw, why the patch changelog mentioned that the root shadow page will be
reused, I think it will be zapped in mmu_free_roots. 

Regards,
Wanpeng Li 

>
>Paolo

  reply	other threads:[~2015-05-14  0:34 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-13  6:42 [PATCH v3 00/10] KVM: MTRR fixes and some cleanups Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 01/10] KVM: MMU: fix decoding cache type from MTRR Xiao Guangrong
2015-05-13  8:09   ` Wanpeng Li
2015-07-12 17:33   ` Alex Williamson
2015-07-12 18:59     ` Xiao Guangrong
2015-07-13  7:32       ` Paolo Bonzini
2015-07-13 14:45         ` Xiao Guangrong
2015-07-13 15:13           ` Paolo Bonzini
2015-07-13 15:15             ` Xiao Guangrong
2015-07-14 21:12               ` MTRR setup in OVMF [was: PATCH v3 01/10 KVM: MMU: fix decoding cache type from MTRR] Laszlo Ersek
2015-07-14 21:15                 ` [edk2] " Paolo Bonzini
2015-07-14 21:29                   ` Laszlo Ersek
2015-07-14 22:37                     ` Jordan Justen
2015-07-15  9:57                       ` [edk2] " Laszlo Ersek
2015-07-15  0:14                   ` Fan, Jeff
2015-07-15 19:30                   ` Xiao Guangrong
2015-07-15 19:41                     ` Laszlo Ersek
2015-07-12 19:12     ` [PATCH v3 01/10] KVM: MMU: fix decoding cache type from MTRR Bandan Das
2015-05-13  6:42 ` [PATCH v3 02/10] KVM: MMU: introduce for_each_rmap_spte() Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 03/10] KVM: MMU: introduce PT_MAX_HUGEPAGE_LEVEL Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 04/10] KVM: MMU: introduce for_each_slot_rmap_range Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 05/10] KVM: MMU: introduce slot_handle_level_range() and its helpers Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 06/10] KVM: MMU: use slot_handle_level and its helper to clean up the code Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 07/10] KVM: MMU: introduce kvm_zap_rmapp Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 08/10] KVM: MMU: introduce kvm_zap_gfn_range Xiao Guangrong
2015-05-13  6:42 ` [PATCH v3 09/10] KVM: MMU: fix MTRR update Xiao Guangrong
2015-05-13  8:43   ` Wanpeng Li
2015-05-13 14:10     ` Paolo Bonzini
2015-05-14  0:16       ` Wanpeng Li [this message]
2015-05-14  8:43         ` Paolo Bonzini
2015-05-13  6:42 ` [PATCH v3 10/10] KVM: x86: do not reset mmu if CR0.CD and CR0.NW are changed Xiao Guangrong
2015-05-13 14:14 ` [PATCH v3 00/10] KVM: MTRR fixes and some cleanups Paolo Bonzini

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