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| author | Arbel Moshe <arbel.moshe@oracle.com> | 2018-03-12 13:12:53 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:02:01 +0100 |
| commit | 2d7921c499afebac78b13ab9a3758261a97e07b7 (patch) | |
| tree | 9fbeb2ebc8c352acdbaab0c13857de719467a76b /Documentation/virtual | |
| parent | 9718420e9fd462ac6b7ea840f9e63eb6af7e1bda (diff) | |
KVM: x86: Add support for VMware backdoor Pseudo-PMCs
VMware exposes the following Pseudo PMCs:
0x10000: Physical host TSC
0x10001: Elapsed real time in ns
0x10002: Elapsed apparent time in ns
For more info refer to:
https://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf
VMware allows access to these Pseduo-PMCs even when read via RDPMC
in Ring3 and CR4.PCE=0. Therefore, commit modifies x86 emulator
to allow access to these PMCs in this situation. In addition,
emulation of these PMCs were added to kvm_pmu_rdpmc().
Signed-off-by: Arbel Moshe <arbel.moshe@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual')
0 files changed, 0 insertions, 0 deletions