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Subjecthv_hypercall_pg page permissios
Hi all,

The x86 Hyper-V hypercall page (hv_hypercall_pg) is the only allocation
in the kernel using __vmalloc with exectutable persmissions, and the
only user of PAGE_KERNEL_RX. Is there any good reason it needs to
be readable? Otherwise we could use vmalloc_exec and kill off
PAGE_KERNEL_RX. Note that before 372b1e91343e6 ("drivers: hv: Turn off
write permission on the hypercall page") it was even mapped writable..

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