linux-kernel - RE: [PATCH v4 2/8] mm: Actually mark kernel page table pages

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Message-ID: <BL1PR11MB52711D9B7A0458D45868DA688C08A@BL1PR11MB5271.namprd11.prod.outlook.com>
Date: Fri, 12 Sep 2025 07:59:07 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>, "Will
 Deacon" <will@...nel.org>, Robin Murphy <robin.murphy@....com>, "Jason
 Gunthorpe" <jgg@...dia.com>, Jann Horn <jannh@...gle.com>, Vasant Hegde
	<vasant.hegde@....com>, "Hansen, Dave" <dave.hansen@...el.com>, "Alistair
 Popple" <apopple@...dia.com>, Peter Zijlstra <peterz@...radead.org>,
	Uladzislau Rezki <urezki@...il.com>, Jean-Philippe Brucker
	<jean-philippe@...aro.org>, Andy Lutomirski <luto@...nel.org>, "Lai, Yi1"
	<yi1.lai@...el.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "security@...nel.org"
	<security@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Dave Hansen <dave.hansen@...ux.intel.com>
Subject: RE: [PATCH v4 2/8] mm: Actually mark kernel page table pages

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Friday, September 5, 2025 1:51 PM
> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Now that the API is in place, mark kernel page table pages just
> after they are allocated. Unmark them just before they are freed.
> 
> Note: Unconditionally clearing the 'kernel' marking (via
> ptdesc_clear_kernel()) would be functionally identical to what
> is here. But having the if() makes it logically clear that this
> function can be used for kernel and non-kernel page tables.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>