xen/arm: Enable the compilation of mem_access and mem_event on ARM.

This patch sets up the infrastructure to support mem_access and mem_event on ARM and turns on compilation. We define the required XSM functions, handling of domctl copyback, and the required p2m types and stub-functions in this patch.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
tools/libxc: Allocate magic page for mem access on ARM

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
xen/arm: Data abort exception (R/W) mem_events.

This patch replaces the stub p2m functions with the actual ones required to store, set, check and deliver LPAE R/W mem_events. As the LPAE PTE lacks available bits to store the p2m_access_t bits, we use a separate radix tree (mem_access_settings) to store the permissions with the key being the gfn.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
xen/arm: Instruction prefetch abort (X) mem_event handling

Add missing structure definition for iabt and use the LPAE NX bit to set eXecute mem_event traps.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>
tools/tests: Enable xen-access on ARM

Signed-off-by: Tamas K Lengyel <tamas.lengyel@zentific.com>