KVM: x86: Add support for VMware backdoor Pseudo-PMCs

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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>

...

This commit is contained in:

Arbel Moshe 2018-03-12 13:12:53 +02:00 • committed by Paolo Bonzini

parent 9718420e9f

commit 2d7921c499

4 changed files with 75 additions and 17 deletions

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8

arch/x86/kvm/emulate.c

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37

arch/x86/kvm/pmu.c

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6

arch/x86/kvm/pmu.h

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41

arch/x86/kvm/x86.c

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