perf/x86/intel/pt: Relax address filter validation
authorAdrian Hunter <adrian.hunter@intel.com>
Mon, 31 Jan 2022 07:24:49 +0000 (09:24 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 29 Oct 2022 08:12:53 +0000 (10:12 +0200)
commit537412c5471211a686738e5f37a00aea7da6ddc3
treed44d2d4f2ac00deb446a7eb3d4a50267f962b6d6
parent8ddc58e0e312f85e975f350cbe43ba1d9836eb1f
perf/x86/intel/pt: Relax address filter validation

commit c243cecb58e3905baeace8827201c14df8481e2a upstream.

The requirement for 64-bit address filters is that they are canonical
addresses. In other respects any address range is allowed which would
include user space addresses.

That can be useful for tracing virtual machine guests because address
filtering can be used to advantage in place of current privilege level
(CPL) filtering.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220131072453.2839535-2-adrian.hunter@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/events/intel/pt.c