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42dbaa5a05
So far KVM only had basic x86 debug register support, once introduced to realize guest debugging that way. The guest itself was not able to use those registers. This patch now adds (almost) full support for guest self-debugging via hardware registers. It refactors the code, moving generic parts out of SVM (VMX was already cleaned up by the KVM_SET_GUEST_DEBUG patches), and it ensures that the registers are properly switched between host and guest. This patch also prepares debug register usage by the host. The latter will (once wired-up by the following patch) allow for hardware breakpoints/watchpoints in guest code. If this is enabled, the guest will only see faked debug registers without functionality, but with content reflecting the guest's modifications. Tested on Intel only, but SVM /should/ work as well, but who knows... Known limitations: Trapping on tss switch won't work - most probably on Intel. Credits also go to Joerg Roedel - I used his once posted debugging series as platform for this patch. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com> |
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