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Date: Thu, 28 Mar 2024 13:55:17 -0700
From: Isaku Yamahata <isaku.yamahata@intel.com>
To: Binbin Wu <binbin.wu@linux.intel.com>
Cc: isaku.yamahata@intel.com, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, isaku.yamahata@gmail.com,
	Paolo Bonzini <pbonzini@redhat.com>, erdemaktas@google.com,
	Sean Christopherson <seanjc@google.com>,
	Sagi Shahar <sagis@google.com>, Kai Huang <kai.huang@intel.com>,
	chen.bo@intel.com, hang.yuan@intel.com, tina.zhang@intel.com,
	isaku.yamahata@linux.intel.com
Subject: Re: [PATCH v19 060/130] KVM: x86/tdp_mmu: Apply mmu notifier
 callback to only shared GPA
Message-ID: <20240328205517.GQ2444378@ls.amr.corp.intel.com>
References: <cover.1708933498.git.isaku.yamahata@intel.com>
 <dead197f278d047a00996f636d7eef4f0c8a67e8.1708933498.git.isaku.yamahata@intel.com>
 <2f2b4b37-2b99-4373-8d0d-cc6bc5eed33f@linux.intel.com>
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In-Reply-To: <2f2b4b37-2b99-4373-8d0d-cc6bc5eed33f@linux.intel.com>

On Thu, Mar 28, 2024 at 04:29:50PM +0800,
Binbin Wu <binbin.wu@linux.intel.com> wrote:

> 
> 
> On 2/26/2024 4:26 PM, isaku.yamahata@intel.com wrote:
> > From: Isaku Yamahata <isaku.yamahata@intel.com>
> > 
> > The private GPAs that typically guest memfd backs aren't subject to MMU
> > notifier because it isn't mapped into virtual address of user process.
> > kvm_tdp_mmu_handle_gfn() handles the callback of the MMU notifier,
> > clear_flush_young(), clear_young(), test_young()() and change_pte().  Make
>                                                    ^
>                                                    an extra "()"

Will fix it. Thanks.

> > kvm_tdp_mmu_handle_gfn() aware of private mapping and skip private mapping.
> > 
> > Even with AS_UNMOVABLE set, those mmu notifier are called.  For example,
> > ksmd triggers change_pte().
> 
> The description about the "AS_UNMOVABLE", you are refering to shared memory,
> right?
> Then, it seems not related to the change of this patch.

Ok, will remove this sentence.
-- 
Isaku Yamahata <isaku.yamahata@intel.com>