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authorPeter Zijlstra <peterz@infradead.org>2012-09-14 00:59:14 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-10-16 19:43:58 +0400
commit20b279ddb38ca42f8863cec07b4d45ec24589f13 (patch)
tree993ddf58189bc665e0f392042321770e488e123d /tools
parent1342798cc13e3b48d9b5738f0c8fa812ccea8101 (diff)
downloadlinux-20b279ddb38ca42f8863cec07b4d45ec24589f13.tar.xz
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>
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