Re: [Xen-devel] [PATCH V2] tests/xen-access: Added vm_event emulation tests

[Tamas K Lengyel <tamas@xxxxxxxxxxxxx>]

On Sat, Apr 15, 2017 at 1:45 AM, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx> wrote:

This patch adds support for testing instruction emulation when
required by the vm_event reply sent for MEM_ACCESS events. To this
end, it adds the "emulate_write" and "emulate_exec" parameters
that behave like the old "write" and "exec" parameters, except
instead of allowing writes / executes for a hit page, they emulate
the trigger instruction. The new parameters don't mark all of the
guest's pages, instead they stop at the arbitrary low limit of
the first 1000 pages - otherwise the guest would slow to a crawl.
Since the emulator is still incomplete and has trouble with
emulating competing writes in SMP scenarios, the new tests are
only meant for debugging issues.

Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>

Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>

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