tree df8f36cae081baeec8859cc367175d6dcaf36c85
parent 37f0e8fe6b10ee2ab52576caa721ee1282de74a6
author Junaid Shahid <junaids@google.com> 1481071576 -0800
committer Radim Krčmář <rkrcmar@redhat.com> 1483969571 +0100

kvm: x86: mmu: Lockless access tracking for Intel CPUs without EPT A bits.

This change implements lockless access tracking for Intel CPUs without EPT
A bits. This is achieved by marking the PTEs as not-present (but not
completely clearing them) when clear_flush_young() is called after marking
the pages as accessed. When an EPT Violation is generated as a result of
the VM accessing those pages, the PTEs are restored to their original values.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>