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| author | Peter Zijlstra <peterz@infradead.org> | 2012-09-13 14:59:14 -0600 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-16 12:43:58 -0300 |
| commit | 20b279ddb38ca42f8863cec07b4d45ec24589f13 (patch) | |
| tree | 993ddf58189bc665e0f392042321770e488e123d /tools/perf | |
| parent | 1342798cc13e3b48d9b5738f0c8fa812ccea8101 (diff) | |
| download | linux-20b279ddb38ca42f8863cec07b4d45ec24589f13.tar.gz linux-20b279ddb38ca42f8863cec07b4d45ec24589f13.tar.bz2 linux-20b279ddb38ca42f8863cec07b4d45ec24589f13.zip | |
perf: Require exclude_guest to use PEBS - kernel side enforcement
Intel PEBS in VT-x context uses the DS address as a guest linear
address, even though its programmed by the host as a host linear
address. This either results in guest memory corruption and or the
hardware faulting and 'crashing' the virtual machine. Therefore we have
to disable PEBS on VT-x enter and re-enable on VT-x exit, enforcing a
strict exclude_guest.
This patch enforces exclude_guest kernel side.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Robert Richter <robert.richter@amd.com>
Link: http://lkml.kernel.org/r/1347569955-54626-3-git-send-email-dsahern@gmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
0 files changed, 0 insertions, 0 deletions