linux-kernel - Re: [PATCH RFC v6 13/26] nova-core: mm: Add unified page table entry wrapper enums

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Message-ID: <925b7dd5-c941-4946-8148-ebd7e8eeca65@nvidia.com>
Date: Wed, 21 Jan 2026 13:35:04 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: Zhi Wang <zhiw@...dia.com>
Cc: linux-kernel@...r.kernel.org,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Simona Vetter <simona@...ll.ch>,
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 Jani Nikula <jani.nikula@...ux.intel.com>,
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Subject: Re: [PATCH RFC v6 13/26] nova-core: mm: Add unified page table entry
 wrapper enums



On 1/21/2026 4:54 AM, Zhi Wang wrote:
> On Tue, 20 Jan 2026 15:42:50 -0500
> Joel Fernandes <joelagnelf@...dia.com> wrote:
>> Add unified Pte, Pde, and DualPde wrapper enums that abstract over
>> MMU v2 and v3 page table entry formats. These enums allow the page
>> table walker and VMM to work with both MMU versions.
>>
> 
> snip
> 
>> +impl DualPde {
>> +    /// Create a [`DualPde`] from raw 128-bit value (two `u64`s) for
>> the given MMU version.
>> +    pub(crate) fn new(version: MmuVersion, big: u64, small: u64) ->
>> Self {
>> +        match version {
>> +            MmuVersion::V2 => Self::V2(ver2::DualPde::new(big, small)),
>> +            MmuVersion::V3 => Self::V3(ver3::DualPde::new(big, small)),
>> +        }
>> +    }
>> +
>> +    /// Create a [`DualPde`] with only the small page table pointer set.
>> +    pub(crate) fn new_small(version: MmuVersion, table_pfn: Pfn) ->
>> Self {
>> +        match version {
>> +            MmuVersion::V2 =>
>> Self::V2(ver2::DualPde::new_small(table_pfn)),
>> +            MmuVersion::V3 =>
>> Self::V3(ver3::DualPde::new_small(table_pfn)),
>> +        }
>> +    }
>> +
>> +    /// Check if the small page table pointer is valid.
>> +    pub(crate) fn has_small(&self) -> bool {
>> +        match self {
>> +            Self::V2(d) => d.has_small(),
>> +            Self::V3(d) => d.has_small(),
>> +        }
>> +    }
>> +
> 
> Should we also have a has_big here as well?
Good catch, I will add that in, thanks.

--
Joel Fernandes