Re: [Xen-devel] [PATCH] x86/pagewalk: Remove opt_allow_superpage check from guest_can_use_l2_superpages()

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jul 25, 2017 at 04:00:13PM +0100, Andrew Cooper wrote:
> The purpose of guest_walk_tables() is to match the behaviour of real hardware.
> 
> A PV guest can have 2M superpages in its pagetables, via the M2P and the
> initial initrd mapping, even if it isn't permitted to create arbitrary 2M
> superpage mappings.
> 
> guest_can_use_l2_superpages() checking opt_allow_superpage is a piece of PV
> guest policy enforcement, rather than its intended purpose of meaning "would
> hardware tolerate finding an L2 superpage with these control settings?"
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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