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| author | Paul Mackerras <paulus@ozlabs.org> | 2016-11-16 22:33:27 +1100 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2016-11-24 09:24:23 +1100 |
| commit | 83677f551e0a6ad43061053e7d6208abcd2707f0 (patch) | |
| tree | 40a3b34b6abde4d5fb426b9ea870edc177aa7c9f /Documentation/virtual/kvm/api.txt | |
| parent | 7a84084c60545bc47f3339344f1af5f94599c966 (diff) | |
| download | lwn-83677f551e0a6ad43061053e7d6208abcd2707f0.tar.gz lwn-83677f551e0a6ad43061053e7d6208abcd2707f0.zip | |
KVM: PPC: Book3S HV: Adjust host/guest context switch for POWER9
Some special-purpose registers that were present and accessible
by guests on POWER8 no longer exist on POWER9, so this adds
feature sections to ensure that we don't try to context-switch
them when going into or out of a guest on POWER9. These are
all relatively obscure, rarely-used registers, but we had to
context-switch them on POWER8 to avoid creating a covert channel.
They are: SPMC1, SPMC2, MMCRS, CSIGR, TACR, TCSCR, and ACOP.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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